International Journal of Environmental Science and Technology最新文献_第7页

Structural and functional characterization of water hyacinth-based nano-cellulose bioaerogels 水葫芦基纳米纤维素生物气凝胶的结构与功能表征

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-15 DOI: 10.1007/s13762-026-07219-9

B. Budianto, R. E. Yasin

{"title":"Structural and functional characterization of water hyacinth-based nano-cellulose bioaerogels","authors":"B. Budianto, R. E. Yasin","doi":"10.1007/s13762-026-07219-9","DOIUrl":"10.1007/s13762-026-07219-9","url":null,"abstract":"<div><p>Water hyacinth (<i>Eichhornia crassipes</i>) is a highly invasive aquatic plant in Indonesia, where its rapid proliferation causes severe ecological degradation, blockage of waterways, and socio-economic disruption. Converting this problematic biomass into value-added functional materials represents a sustainable mitigation strategy. This study aimed to develop a nanocellulose-based bioaerogel derived from water hyacinth for the adsorption of volatile organic compounds (VOCs), with formaldehyde as a target pollutant. Nanocellulose was isolated through delignification and bleaching processes, followed by physicochemical and structural characterization. The bioaerogel was fabricated via freeze-drying and evaluated through formaldehyde adsorption experiments, non-linear isotherm and kinetic modeling, reusability tests, and external validation under VOC conditions simulating real applications. The results showed that the bioaerogel exhibited a high formaldehyde adsorption capacity, with a maximum Langmuir uptake of 62.32 ± 4.47 mg/g. The adsorption kinetics were best described by the pseudo-second-order model, indicating rapid and efficient adsorption behavior. The bioaerogel retained approximately 60% of its adsorption capacity after ten reuse cycles. Chamber tests demonstrated an 83.5% reduction in formaldehyde concentration within 360 min, while external validation using VOCs emitted from paint, plastic, and adhesive sources confirmed the reliability of the adsorption performance. Overall, nanocellulose-based bioaerogel derived from water hyacinth shows strong potential as an effective, regenerable, and environmentally friendly VOC adsorbent, while offering a promising pathway for the sustainable utilization of invasive aquatic biomass.</p><h3>Graphical abstarct</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal hydrolysis pretreatment for anaerobic digestion of cotton textile waste 棉纺织废料厌氧消化的热水解预处理

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-15 DOI: 10.1007/s13762-026-07172-7

N. Tharmarajah, K. Shahbaz, S. Baroutian

{"title":"Thermal hydrolysis pretreatment for anaerobic digestion of cotton textile waste","authors":"N. Tharmarajah, K. Shahbaz, S. Baroutian","doi":"10.1007/s13762-026-07172-7","DOIUrl":"10.1007/s13762-026-07172-7","url":null,"abstract":"<div><p>Cotton textile waste is challenging to digest and convert to biogas during anaerobic digestion (AD) due to high crystallinity of cellulose. This study investigated thermal hydrolysis pretreatment (THP) at 120–200 °C for 30 and 60 min to enhance cotton biodegradability prior 21 days of mesophilic AD at a substrate-to-inoculum ratio of 0.5 volatile solids (VS) basis. THP increased cotton solubilisation up to 98% VS removal, at the most sever condition (200 °C, 60 min), crystallinity decreased by 11.84% and COD solubilisation reached 51. However, the highest methane yield was achieved under moderate conditions (140 °C, 60 min), producing 17.92 mL CH<sub>4</sub>/g VS, representing a 123% increase over untreated cotton, indicating an optimal balance between solubilisation and process inhibition. Gompertz modelling showed excellent agreement (<i>R</i><sup>2</sup> ≥ 0.99), with a reduced lag phase (2.3 days) and ~2-fold higher biodegradability than untreated cotton. Digestate pH, ammonia nitrogen, and volatile fatty acid (VFA) remained within non-inhibitory ranges under the optimal THP condition, supporting stable and efficient methane production. These results identify cotton-specific THP operating conditions and demonstrate THP-AD as a pathway for valorising cotton textile waste.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07172-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of organic matter concentration on denitrification performance in anaerobic reactors 有机物浓度对厌氧反应器反硝化性能的影响

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-15 DOI: 10.1007/s13762-026-07198-x

J. H. Pastorelli Filho, M. E. P. Almeida, A. L. Tonetti

{"title":"Effect of organic matter concentration on denitrification performance in anaerobic reactors","authors":"J. H. Pastorelli Filho, M. E. P. Almeida, A. L. Tonetti","doi":"10.1007/s13762-026-07198-x","DOIUrl":"10.1007/s13762-026-07198-x","url":null,"abstract":"<div><p>Wastewater treatment remains a challenging issue in developing countries, particularly due to the difficulty in controlling nitrogenous compounds release. Anaerobic reactors are widely used and effective in removing organic matter, but they are usually insufficient to meet nitrogen discharge criteria. The recirculation of nitrified effluent has become a viable alternative to promote denitrification without major structural changes. The present study evaluated the denitrification occurring in a Upflow Anaerobic Sludge Blanket reactor (UASB) and in a packed-bed reactor (PBR), operating with fixed concentrations of nitrate (50 mgN–NO<sub>3</sub><sup>−</sup> L<sup>−1</sup>) and five decreasing levels of organic matter. The results showed similar performance between both systems, with complete denitrification occurring only when the COD/N–NO<sub>3</sub><sup>−</sup> ratio was higher than 6. At lower ratios, both systems exhibited partial removal, with a slight advantage for the PBR.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07198-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced sulfate radical generation through bimetallic Ni–Cu catalysts synthesized in a fluidized bed for rapid RB5 degradation 流化床合成双金属Ni-Cu催化剂促进RB5快速降解硫酸盐自由基生成

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-15 DOI: 10.1007/s13762-026-07162-9

P. Družaitė, D. Martuzevičius, T.-H. Ha, M.-C. Lu

{"title":"Enhanced sulfate radical generation through bimetallic Ni–Cu catalysts synthesized in a fluidized bed for rapid RB5 degradation","authors":"P. Družaitė, D. Martuzevičius, T.-H. Ha, M.-C. Lu","doi":"10.1007/s13762-026-07162-9","DOIUrl":"10.1007/s13762-026-07162-9","url":null,"abstract":"<div><p>The treatment of dye-containing wastewater remains a significant environmental challenge, as persistent azo dyes such as Reactive Black 5 (RB5) are resistant to conventional oxidation and biological processes. In this study, we propose a Fe-free advanced oxidation strategy based on sodium persulfate activation using Ni–Cu bimetallic catalysts synthesized via fluidized-bed homogeneous crystallization (FBHC), with a systematic comparison to catalysts prepared by conventional jar-test precipitation (JAR). The novelty of this work lies in coupling FBHC synthesis with persulfate activation to produce highly reactive, amorphous Ni–Cu catalysts capable of rapid pollutant degradation under near-neutral conditions, thereby overcoming the sludge generation and pH limitations associated with traditional Fenton systems. Using 100 mg L<sup>−1</sup> RB5 as a model contaminant, the FBHC-derived catalyst achieved > 90% decolorization within 10 min and 70.7% TOC removal within 5 min, significantly outperforming the JAR-derived material. Kinetic analysis indicated that the degradation followed the Langmuir–Hinshelwood model, suggesting a surface-controlled reaction pathway. Radical scavenging and EPR analyses identified SO<sub>4</sub>·<sup>−</sup> and <sup>1</sup>O<sub>2</sub> as the dominant reactive species, with minor contributions from ·OH and negligible involvement of O<sub>2</sub>·<sup>−</sup>. Overall, this study demonstrates that (i) FBHC is an effective method for fabricating highly reactive bimetallic catalysts and (ii) the Ni–Cu/persulfate system represents a rapid, Fe-free oxidation process operable under mild pH conditions, offering a promising strategy for efficient and scalable textile wastewater treatment.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07162-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-regenerating hybrid alginate-carbon bioactive beads for gas-phase toluene removal under ambient conditions 环境条件下用于气相脱甲苯的自再生海藻酸碳杂化生物活性微球

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-14 DOI: 10.1007/s13762-026-07183-4

R. Jeong, C. Gwak, D. Kim

{"title":"Self-regenerating hybrid alginate-carbon bioactive beads for gas-phase toluene removal under ambient conditions","authors":"R. Jeong, C. Gwak, D. Kim","doi":"10.1007/s13762-026-07183-4","DOIUrl":"10.1007/s13762-026-07183-4","url":null,"abstract":"<div><p>Adsorptive materials capable of controlling gaseous VOCs at room temperature without external regeneration face significant challenges. In this study, hybrid alginate-carbon beads were prepared by co-immobilizing powdered activated carbon and <i>Pseudomonas putida</i> F1 within a calcium-alginate matrix. The beads were designed to capture toluene through carbon-based adsorption and to restore adsorption capacity through microbial oxidation occurring inside the material. Batch adsorption experiments showed that the powered-carbon control followed typical Langmuir and Freundlich isotherms, while the bioactive beads exhibited non-equilibrium behaviors consistent with simultaneous microbial degradation described by Michaelis–Menten kinetics. In a continuous-flow gas-phase column (33 ppmv inlet, 80% relative humidity, 28 °C) operated under 8 h flow/16 h idle cycles, toluene removal efficiency increased from 65% to over 99% within several days and remained stable during prolonged cyclic operation. Daily carbon balance and CO<sub>2</sub> production confirmed that adsorbed toluene was oxidized during the idle period, regenerating adsorption sites without external heating or chemical treatment. Microscopic observations further indicated that the hybrid matrix maintained its structural integrity while supporting viable microbial clusters over long-term use. These results demonstrate that the hybrid beads act as a self-regenerating bioactive adsorbent capable of stable gas-phase VOCs control under ambient conditions. The coupled adsorption–biodegradation cycle offers a practical low-energy route to reduce sorbent consumption and waste generation in VOCs abatement systems.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of methylene blue adsorption using grapefruit peel-derived active biochar-magnetite/alginate bead composite via box-behnken design 盒子设计优化葡萄柚皮活性生物炭-磁铁矿/海藻酸盐珠状复合材料对亚甲基蓝的吸附

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-13 DOI: 10.1007/s13762-026-07158-5

I. Küçük, T. Utku

{"title":"Optimization of methylene blue adsorption using grapefruit peel-derived active biochar-magnetite/alginate bead composite via box-behnken design","authors":"I. Küçük, T. Utku","doi":"10.1007/s13762-026-07158-5","DOIUrl":"10.1007/s13762-026-07158-5","url":null,"abstract":"<div><p>This study reports the preparation and optimization of a magnetic biochar–alginate bead composite for the removal of methylene blue (MB) from aqueous solutions. Activated biochar (ABC) was produced from grapefruit peel (GP) waste through chemical activation and subsequently modified with Fe<sub>3</sub>O<sub>4</sub> nanoparticles to obtain magnetic biochar (ABC-Mag). The magnetic material was immobilized in sodium alginate to form easily separable hydrogel beads (GP-ABC-Fe@Alg). The composite was comprehensively characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, Barrett–Joyner–Halenda (BJH) pore distribution analysis, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The BET surface area and total pore volume of the composite were determined as 349 m<sup>2</sup> g<sup>−1</sup> and 0.251 cm<sup>3</sup> g<sup>−1</sup>, respectively. Adsorption performance was optimized using response surface methodology (RSM) based on the Box–Behnken design (BBD), considering solution pH (2–10), initial MB concentration (50–150 mg L<sup>−1</sup>), and adsorbent dosage (0.02–0.10 g) as independent variables. The maximum adsorption capacity was obtained under optimum conditions of pH 6, 150 mg L<sup>−1</sup> initial concentration, and 0.10 g adsorbent dosage. Isotherm and kinetic analyses indicated that the adsorption process was best described by the Temkin isotherm and pseudo-first-order kinetic model. Electrostatic interactions, π–π stacking, hydrogen bonding, and pore-filling effects were identified as the primary mechanisms governing MB adsorption. The results demonstrate that GP-ABC-Fe@Alg is a promising, low-cost, and magnetically recoverable adsorbent for dye-contaminated wastewater treatment.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07158-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated assessment of toxic elements in PM10 during cold season in a coastal city of southern Peru 秘鲁南部沿海城市冬季PM10中有毒元素的综合评估

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-13 DOI: 10.1007/s13762-026-07159-4

L. A. Paccosonco Sucapuca, J. A. Valeriano Zapana, A. E. Larrea Valdivia, D. M. Alvarez-Tolentino, A. R. Huaman-De La Cruz, A. Gioda, M. E. Santacruz Huillca, O. Suaña Diaz

{"title":"Integrated assessment of toxic elements in PM10 during cold season in a coastal city of southern Peru","authors":"L. A. Paccosonco Sucapuca, J. A. Valeriano Zapana, A. E. Larrea Valdivia, D. M. Alvarez-Tolentino, A. R. Huaman-De La Cruz, A. Gioda, M. E. Santacruz Huillca, O. Suaña Diaz","doi":"10.1007/s13762-026-07159-4","DOIUrl":"10.1007/s13762-026-07159-4","url":null,"abstract":"<div><p>This study evaluated concentrations of particulate matter with aerodynamic diameter ≤ 10 µm (PM10) and potentially toxic elements (PTEs) in three urban zones of Ilo, a coastal city in southern Peru, during the cold season (July–October 2022). The cold season is characterised by greater atmospheric stability and a lower mixing layer height, which favours pollutant accumulation and scenarios of higher potential exposure. Three contrasting zones were analysed: commercial (UCZ), industrial (UIZ), and peripheral (UPZ), through daily PM10 sampling and analysis of six PTEs (Al, As, Ba, Cu, Mn, and Zn). The UPZ recorded the highest mean PM10 concentration (23.8 ± 11.6 µg/m<sup>3</sup>), with 5% of daily records exceeding the World Health Organization (WHO) guideline of 45 µg/m<sup>3</sup>, and the highest concentrations of Cu and As, significantly higher than UIZ and UCZ (p < 0.001 and p = 0.015, respectively). The combined application of environmental indices classified UPZ as heavily contaminated by Cu and As, with extreme enrichment (enrichment factor, EF Cu = 2432; EF As = 2393) and considerable ecological risk (potential ecological risk, PER = 384). Back-trajectory analysis (HYSPLIT) revealed that the highest concentration episodes at UPZ coincided with air masses arriving from continental sectors at 1000 m altitude, including the direction of the local smelter. Health risk assessment identified significant non-carcinogenic risk exclusively at UPZ (hazard index, HI = 7.2), dominated by Cu (89%), while the incremental lifetime carcinogenic risk (ILCR) from As remained at acceptable levels. These findings are applicable to industrialised coastal cities with port, metallurgical, and urban activities in developing countries.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07159-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrometallurgical recycling of waste lithium iron phosphate batteries using different organic acids and reductants 使用不同有机酸和还原剂的废磷酸铁锂电池的湿法冶金回收

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-13 DOI: 10.1007/s13762-026-07230-0

G. Avcı, A. Özdemir

{"title":"Hydrometallurgical recycling of waste lithium iron phosphate batteries using different organic acids and reductants","authors":"G. Avcı, A. Özdemir","doi":"10.1007/s13762-026-07230-0","DOIUrl":"10.1007/s13762-026-07230-0","url":null,"abstract":"<div><p>This study aimed to examine lithium (Li) leaching efficiency and Li recovery yield from waste lithium iron phosphate batteries using various organic acid medias and reductants. To achieve this goal, a hydrometallurgical recycling process was employed, involving the use of reductants-hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and glucose—in conjunction with organic acids of acetic acid and formic acid. The leaching experiments were conducted under varying conditions of acid concentration, reaction time, and reductant type to determine their influence on Li leaching performance. According to experiment results, Li leaching efficiencies obtained ranged from 54–97%. The highest achieved leaching efficiency was obtained by using formic acid as the leaching reagent in combination with glucose as the organic reductant. This study contributes to literature as the first to investigate the combination of formic acid and glucose for the recovery of valuable metals from waste LFPs, offering a green and sustainable alternative to traditional reducing agents. These findings demonstrate that the use of organic acid and a glucose reducing agent leads to high leaching yields can be achieved. Following leaching, a precipitation process was applied to the leachate, through which Li was recovered in the form of salts as lithium carbonate or lithium phosphate. Li recovery efficiency was found to be approximately 90% across all experiments, regardless of the leaching conditions. The use of glucose instead of H<sub>2</sub>O<sub>2</sub> in the leaching process is expected to eliminate, the need for strong inorganic acids, offering a more sustainable route for Li recovery following the precipitation step.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13762-026-07230-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphology tuning of g-C3N4 for Rhodamine B and mixed-dye system degradation via visible-light photocatalysis g-C3N4对罗丹明B和混合染料体系降解的形貌调控

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-13 DOI: 10.1007/s13762-026-07182-5

E. A. Fraile-Paez, F. Paraguay-Delgado, J. C. Pantoja-Espinoza

{"title":"Morphology tuning of g-C3N4 for Rhodamine B and mixed-dye system degradation via visible-light photocatalysis","authors":"E. A. Fraile-Paez, F. Paraguay-Delgado, J. C. Pantoja-Espinoza","doi":"10.1007/s13762-026-07182-5","DOIUrl":"10.1007/s13762-026-07182-5","url":null,"abstract":"<div><p>The degradation of persistent organic pollutants present in wastewater remains a significant environmental challenge. Photocatalysis is considered one of the most suitable advanced oxidation processes for addressing this problem. In this context, g-C<sub>3</sub>N<sub>4</sub> represents a promising option due to its low cost, low toxicity, and metal-free nature. The objective of this work was to synthesize and characterize three morphologies of g-C<sub>3</sub>N<sub>4</sub>—lamellar, microrods, and nanotubes—and to evaluate their photocatalytic performance in the degradation of the Rhodamine B dye. These morphologies were obtained by chemical reflux, hydrothermal treatment, and self-assembly. XRD, FTIR, STEM, BET, UV–Vis, PL, and XPS were employed to characterize the samples. Photocatalytic activity was evaluated using 50 mg of g-C<sub>3</sub>N<sub>4</sub> in 50 mL of a 10 ppm Rhodamine B solution under visible light provided by a commercial 20 W lamp. The g-C<sub>3</sub>N<sub>4</sub> nanotube morphology showed the best photocatalytic performance, achieving 85% degradation of Rhodamine B after 80 min of reaction. The pseudo-first-order rate constant (<i>k</i> = 2.15 ± 0.29 × 10<sup>−2</sup> min<sup>−1</sup>) was 4.48 times higher than that of bulk g-C<sub>3</sub>N<sub>4</sub>, confirming the influence of the tubular morphology on the degradation efficiency. The g-C<sub>3</sub>N<sub>4</sub> nanotubes exhibited high performance for the simultaneous degradation of methylene blue and methyl orange in mixed-dye systems. Stability tests over six consecutive cycles (660 min) without intermediate washing resulted in a 14% efficiency loss, confirming the photocatalyst´s durability in complex aqueous matrices. g-C<sub>3</sub>N<sub>4</sub> with a nanotube morphology is highly promising for pollutant degradation.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable water treatment using bioadsorbents from agro-industrial waste: a circular strategy for pollution control 利用农业工业废物中的生物吸附剂进行可持续水处理：污染控制的循环战略

IF 3.4 4区环境科学与生态学

International Journal of Environmental Science and Technology Pub Date : 2026-04-13 DOI: 10.1007/s13762-026-07181-6

A. Ghedjemis, M. Kebaili

{"title":"Sustainable water treatment using bioadsorbents from agro-industrial waste: a circular strategy for pollution control","authors":"A. Ghedjemis, M. Kebaili","doi":"10.1007/s13762-026-07181-6","DOIUrl":"10.1007/s13762-026-07181-6","url":null,"abstract":"<div><p>The contamination of aqueous effluents by organic pollutants, particularly synthetic dyes, represents a major global environmental concern. This study focuses on the development and evaluation of bioadsorbents derived from agro-industrial waste (a mixture of orange peels, fibers, pulp, and seeds) from the N’gaous processing industry. This approach aligns with a circular economy strategy, simultaneously targeting wastewater remediation and the management of industrial by-products. Three adsorbents materials were prepared: the raw untreated biomass (OW) and two materials obtained via thermal treatment at 200 °C (OWT200) and 400 °C (OWT400). Physicochemical characterization was performed using Fourier-transform infrared spectroscopy (FTIR) to identify surface functional groups, laser granulometry to determine particle size distribution, and determination of the point of zero charge (PZC) to evaluate pH-dependent surface properties. The results suggest that elevating the treatment temperature induces structural and/or chemical modifications favorable to adsorption, as evidenced by the enhanced adsorption capacity observed for OWT400 compared to OWT200 and OW. The adsorption efficiency for Methylene Blue (MB) in aqueous solution was investigated using a batch system. The influence of key operating parameters—initial solution pH, contact time, adsorbent dosage, and initial adsorbate concentration was evaluated. Kinetic analysis revealed a good fit of the experimental data to the pseudo-second-order model. The adsorption equilibrium study was conducted by fitting the experimental data to the Langmuir, Freundlich, and Temkin isotherm models. The Freundlich model provided the best correlation, suggesting adsorption onto a heterogeneous surface with possible interactions between adsorbed molecules.</p></div>","PeriodicalId":589,"journal":{"name":"International Journal of Environmental Science and Technology","volume":"23 5","pages":""},"PeriodicalIF":3.4,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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