Environmental Science: Water Research & Technology最新文献

{"title":"Effects of chloride transport on the bioelectrochemical remediation of nitrate-contaminated groundwater","authors":"Hanyu Tang, McKenzie Burns, Mohan Qin","doi":"10.1039/d4ew00335g","DOIUrl":"https://doi.org/10.1039/d4ew00335g","url":null,"abstract":"Nitrate is a common groundwater contaminant, primarily caused by the leaching of fertilizers. It poses a risk to human health, prompting the USEPA to set a drinking water limit of 10 mg L<small>⁻¹</small>. Membrane-based bioelectrochemical systems (MBES) are effective treatment mechanisms for remediation of nitrate-rich groundwater. However, there is a knowledge gap surrounding how chloride ions as competing ions impact nitrate removal mechanisms and kinetics. In this study, nitrate-rich groundwater was fed into the cathode side of an MBES equipped with an anion exchange membrane (AEM). Nitrate ions were subsequently transported to the anolyte, where microbe-mediated reduction to N<small>₂</small> was achieved. The system performance was evaluated under varied catholyte nitrate and chloride concentrations as well as with different applied current densities. The MBES consistently achieved nitrate removal efficiencies of at least 85% with catholyte nitrate concentrations ranging from 14 mg L<small>⁻¹</small> NO<small>₃</small><small>⁻</small>-N to 56 mg L<small>⁻¹</small> NO<small>₃</small><small>⁻</small>-N. Notably, the highest nitrate removal rate of 8.28 ± 0.01 mg NO<small>₃</small><small>⁻</small>-N L<small>⁻¹</small> h<small>⁻¹</small> was achieved when the catholyte influent nitrate concentration was 56 mg L<small>⁻¹</small> NO<small>₃</small><small>⁻</small>-N. The nitrate removal behavior in the MBES can be characterized as a pseudo-first-order reaction. The presence of chloride ions, acting as model competing ions to nitrate, was found to decrease the rate of nitrate removal. Additionally, we found that diffusion is the primary driving force for nitrate removal, with electromigration slightly enhancing nitrate transport across the membrane in the MBES. When actual groundwater was used as the catholyte, 90.6 ± 12.1% nitrate was removed and the removal rate reached 5.3 ± 0.4 mg L<small>⁻¹</small> h<small>⁻¹</small> NO<small>₃</small><small>⁻</small>-N, demonstrating the high efficiency of this MBES in treating nitrate-contaminated groundwater.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176669","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}

{"title":"Degradation of benzylamines during chlorination and chloramination","authors":"Chih-Hsien Lin, Wei-Hsiang Chen, William A. Mitch","doi":"10.1039/d4ew00556b","DOIUrl":"https://doi.org/10.1039/d4ew00556b","url":null,"abstract":"As widely used industrial ingredients and products of the biodegradation of benzalkonium chloride disinfectants, benzylamines are expected to occur in municipal wastewater effluents and other wastewater-impacted waters, but their fate during chlorine or chloramine disinfection is unclear. This study characterized the degradation pathways of benzylamine, <em>N</em>-methylbenzylamine and <em>N</em>,<em>N</em>-dimethylbenzylamine during chlorination and chloramination. The dominant reaction pathways during chlorination involved chlorine transfer to the benzylamine nitrogen followed by hydrochloric acid elimination to form an imine and hydrolysis of the imine to form an aldehyde and lower order amine. Benzylamine formed benzaldehyde in preference to benzonitrile. For <em>N</em>-methylbenzylamine and <em>N</em>,<em>N</em>-dimethylbenzylamine, hydrochloric acid elimination between the benzyl nitrogen and the methyl substituent formed formaldehyde and either benzylamine or <em>N</em>-methylbenzylamine, while elimination between the nitrogen and the benzyl substituent formed benzaldehyde and either monomethylamine or dimethylamine. Similar products were observed during chloramination, but over longer timescales. Formation of products involving halogenation of the aromatic ring was not observed. Of highest toxicological concern was the 34% molar yield of NDMA that formed during chloramination of <em>N</em>,<em>N</em>-dimethylbenzylamine in concert with benzyl alcohol by a pathway occurring in parallel to the imine formation and hydrolysis pathway. Based on these reaction pathways, a strategy to reduce NDMA formation within potable reuse facilities was validated using laboratory-scale versions of the reverse osmosis and ultraviolet light processes used in potable reuse trains. The strategy involved treating fully nitrified wastewater influents to these facilities with free chlorine for 5 min to degrade <em>N</em>,<em>N</em>-dimethylbenzylamine and other potent NDMA precursors prior to the addition of ammonia to form chloramines used to control biofouling within these facilities.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176484","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}

{"title":"Production of birnessite-type manganese oxides by biofilms from oxygen-supplemented biological activated carbon (BAC) filters","authors":"Amanda Larasati, Olga Bernadet, Gert Jan W. Euverink, H. Pieter J. van Veelen, Maria Cristina Gagliano","doi":"10.1039/d4ew00208c","DOIUrl":"https://doi.org/10.1039/d4ew00208c","url":null,"abstract":"Biological oxidation of manganese (Mn) by bacteria results in the formation of biogenic Mn oxides (MnOx), which are known to be strong oxidants and effective catalysts. Manganese-oxidizing bacteria (MnOB) often develop in engineered systems for water treatment under oligotrophic conditions. In this study, we investigated the MnOB within biofilms sampled in two different seasons from full-scale oxygen-supplemented biological activated carbon (BAC) filters performing the complete removal of Mn from wastewater. By applying a novel batch enrichment approach ensuring the continuous presence of soluble Mn, after 42 days the start-up microbial community grew into thick, floccular biofilms efficiently oxidizing Mn<small>²⁺</small> into numerous black nodules. The amount of Mn oxidized was quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES). X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) revealed that the MnOx formed was a birnessite-type (δ-MnO<small>₂</small>) with a crystalline, nanoflower structure. Comparison of the microbial community composition before and after the enrichment by means of 16S rRNA gene amplicon sequencing showed increases of members of the orders <em>Rhizobiales</em> and <em>Burkholderiales</em>, and identified among the most abundant some bacterial groups which have rarely or never been associated with Mn oxidation before (<em>Rhodococcus</em>, <em>Ellin6067</em>, <em>Planctomycetota</em> Pir4 lineage, <em>Rhizobiales</em> A0839 and Amb-16S-1323). This study unravels the potential of production of crystalline MnOx by mixed-microbial communities which uniquely generate in a man-made biofilter. The new insights provided implement the knowledge in the field, with the perspective to design innovative biotechnologies to remove recalcitrant compounds where MnOB find optimal growth conditions to produce catalytic forms of MnOx.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176485","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}

{"title":"Thin film-based chemical sensors of Carbon Quantum Dots (CQDs)-Dithizone for the specific detection of Lead ions in water resources","authors":"Tanmay Vyas, Hritik Kumar, Sandeep Choudhary, Abhijeet Joshi","doi":"10.1039/d4ew00452c","DOIUrl":"https://doi.org/10.1039/d4ew00452c","url":null,"abstract":"Abstract Lead (Pb2+) toxicity is one of the scourges that pose hazardous and severe risks to human health and the environment globally. Lead toxicity issues can be addressed primarily by the detection of Pb. Thus, the requirement for accurate sensors for lead detection in environmental samples is tremendously increasing all over the globe. Fluorescence-based detection of lead in water samples can act as a stepping stone towards achieving goals like point-of-care, portable, and on-site detection. In the present study, a selective fluorometric chemical sensor developed from Dithizone and Carbon Quantum dots (CQDs) embedded in the chitosan polymer thin films is evaluated for Pb2+ detection in various natural water resources. The fluorescent chemical sensors were characterized using FTIR, XPS, XRD, TEM, CLSM, UV, and fluorescence spectroscopy. Pb2+ ions were detected employing a fiber optic spectrophotometer (FOS) paired with a reflectance probe. Two river water samples and household tap water samples were evaluated for the presence of Pb2+ ions and spiking studies were carried out to measure the accuracy of detection. The sensing and analytical results indicate that lead detection with the limit of detection of 18.3 nM was possible in the 0-100 µM range of concentration with a 1-minute response time. The spiking of Pb2+ concentration in the various water resources led to an accurate estimation with a maximum error of 1.4%, indicating an interference-free detection of Pb2+. The estimation of Pb2+ based on Micro-plasma Atomic Emission Spectroscopy -was used as a reference method. The results show that the developed fluorescent thin film chemical sensor-(based on Dithizone-CQDs impregnated chitosan thin films coupled with a fiber optic spectrometer device shows tremendous potential for point-of-care and real-time monitoring of Pb2+ ions in real water samples. Keywords: Water pollution, Lead (Pb2+) ions, Chemical sensor, thin films, , Carbon quantum dots (CQDs), Fiber optic spectrometer","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176483","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}

{"title":"Synergistic effect of the heterojunction g-C3N4/Bi2MoO6/clinoptilolite to enhance the photocatalytic degradation of antibiotics in water in the presence of persulfate","authors":"Phuong Thu Le, Thu Phuong Nguyen, Thi Hai Do, Hong Nam Nguyen, Thi Mai Thanh Dinh, Thi Thuy Phan, Toshiki Tsubota, Trung Dung Nguyen","doi":"10.1039/d4ew00549j","DOIUrl":"https://doi.org/10.1039/d4ew00549j","url":null,"abstract":"A novel and highly efficient photocatalyst, g-C<small>₃</small>N<small>₄</small>/Bi<small>₂</small>MoO<small>₆</small>/clinoptilolite nanocomposite (CNBC), was synthesized by a hydrothermal method and acted as a Z-scheme heterojunction for efficient activation of peroxydisulfate (PDS) to degrade oxytetracycline (OTC) under visible light (vis) irradiation. The morphology and structure of the photocatalyst were determined by XRD, FT-IR, FE-SEM, EDX, BET, TGA, UV-vis DRS, PL, and XPS. The results showed that CNBC-30 had the best photocatalytic performance with an OTC removal efficiency of more than 87% within 120 min under the conditions of [OTC] = 20 mg L<small>⁻¹</small>, [catalyst] = 500 mg L<small>⁻¹</small>, [Na<small>₂</small>S<small>₂</small>O<small>₈</small>] = 1.26 mM, and pH = 4 at room temperature, which was much better than those of pure g-C<small>₃</small>N<small>₄</small>, Bi<small>₂</small>MoO<small>₆</small>, and CNB composites. This superiority is due to the excellent adsorption ability of clinoptilolite that effectively forms the g-C<small>₃</small>N<small>₄</small>/Bi<small>₂</small>MoO<small>₆</small> heterojunctions, thus improving the ability to separate charge carriers while decreasing the recombination rate of electron–hole pairs. Furthermore, the effect of catalyst dosage, oxidant concentration, initial pollutant concentration, solution pH, and coexisting anions on the OTC degradation was comprehensively studied. The results showed that the CNBC-30/PDS system had high reusability and adaptability at different pH levels (3.0–11.0). Quenching tests showed that <small>¹</small>O<small>₂</small>, O<small>₂</small>˙<small>⁻</small>, and h<small>⁺</small> played the main roles in OTC degradation. In addition, OTC intermediates were identified and degradation pathways were proposed based on the results of MS analysis. DFT calculations successfully predicted the positions on the OTC molecule with high Fukui numbers that are suitable for attack by oxidants. CNBC-30 was stable for OTC degradation after four cycles with a degradation efficiency of above 78%, demonstrating its durability and potential for practical applications. This study provides insight into PDS activation in the visible light region by a clinoptilolite-based Z-scheme heterojunction for organic pollutant degradation.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142223480","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}

{"title":"Glycine-assisted phosphorus release and recovery from waste-activated sludge†","authors":"Sheqi Cen, Yao Zou, Hang Chen, Xuhan Deng, Fu Huang, Liping Chen, Le Li, Tenghui Jin, Chaohai Wei, Lichao Nengzi and Guanglei Qiu","doi":"10.1039/D4EW00158C","DOIUrl":"10.1039/D4EW00158C","url":null,"abstract":"<p >This study reports a sustainable and green method for phosphorus (P) extraction and recovery from waste activated sludge (WAS) using glycine as a P-extraction agent. Glycine showed an extraordinary ability to induce P release from waste-activated sludge at a rate of 8.7 mg P per L per h without being consumed. The P-extraction rate was linearly related to the mixed liquor suspended solid concentration and was not affected by the temperature in the range of 25–35 °C. After extraction, the released P was recovered <em>via</em> calcium precipitation, resulting in high P-content (48%, as phosphate) products (dominated by amorphous calcium phosphate). An unparallel advantage of the method is the high recyclability of glycine. Repetitive experiments showed &lt;10% glycine loss over four P-extraction–P-recovery–glycine-reuse cycles. Additionally, extremely low heavy metal contents were observed in the P-recovery products in comparison to the acid/alkali-assisted P extraction, indicating its environmental friendliness as a sustainable strategy for P recovery from WAS.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176487","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}

{"title":"Carbon flows and biochar stability during co-pyrolysis of human faeces with wood biomass","authors":"M. E. Koulouri, M. Qiu, M. R. Templeton, G. D. Fowler","doi":"10.1039/d4ew00513a","DOIUrl":"https://doi.org/10.1039/d4ew00513a","url":null,"abstract":"As non-sewered toilets are now the most commonly used sanitation facilities, the faecal sludge management (FSM) sector is starting to be recognised as an important actor for global carbon management. The development of systematic strategies to calculate avoided emissions and carbon storage opportunities is currently constrained by a lack of understanding of carbon flows during faecal sludge treatment. This study investigated carbon sequestration potential for faecal sludge treatment systems that involve co-pyrolysis of human faeces (HF) and wood biomass (WB) at different blending ratios HF : WB (100 : 0, 75 : 25, 50 : 50, 25 : 75, 0 : 100) and temperatures (450, 550, 650 °C). The systematic investigation of analytical biochar stability parameters and the quantification of carbon flows among pyrolysis products were carried out for the first time in the context of faecal sludge. The stability of the produced biochars was assessed based on their remaining volatility, carbon structure (H/C and O/C ratios, SEM and FTIR analyses) and oxidation resistance (chemical oxidation by H<small>₂</small>O<small>₂</small> and thermal degradation by thermogravimetric analysis [<em>R</em><small>₅₀</small> index]). Overall, co-pyrolysis of HF and WB improved carbon fixation and biochar stability, enhancing carbon sequestration potential compared to pyrolysis of pure faecal feedstocks. Biochars produced from 50 : 50 HF : WB blends at 550 °C had the highest carbon retention (41.1%); this feedstock blending ratio corresponds to ∼30 g dry wood added in toilets as a cover material (per user per day), based on the expected daily excretion quantities. For these conditions, the H/C, O/C ratios, H<small>₂</small>O<small>₂</small> oxidation and <em>R</em><small>₅₀</small> index values suggest that the produced biochars have developed an aromatic structure and are suitable for long-term carbon storage. The biochar characteristics were found to be more dependent on feedstock composition than pyrolysis temperature – provided that the temperature reached was sufficient to ensure completion of the main pyrolytic reactions (≥500 °C) – while carbon flows to the bio-oil and non-condensable gas fractions were significantly influenced by pyrolysis operational parameters (retention time and inert gas flow rate). The formation of CaCO<small>₃</small> was observed <em>via</em> SEM/EDX and can be further investigated as a potential additional carbon storage mechanism in FSM. The findings of this research can be used to create a methodological dataset to inform carbon assessments and future modelling applications, paving the way towards the establishment of carbon-negative FSM.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176486","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}

{"title":"Shallow Shell SSTA63 resin: a rapid approach to remediation of hazardous nitrate","authors":"Elif Çendik, Mügenur Saygı, Yaşar Kemal Recepoğlu, Özgür Arar","doi":"10.1039/d4ew00584h","DOIUrl":"https://doi.org/10.1039/d4ew00584h","url":null,"abstract":"This study examines the potential of Purolite Shallow Shell™ SSTA63 anion exchange resin for mitigating nitrate ion (NO<small>₃</small><small>⁻</small>) contamination in aqueous environments. Through systematic experimentation, including dosage optimization, pH dependency, kinetic and desorption studies, we investigate the sorption behavior and practical applications of the resin. Results indicate that the resin effectively removes NO<small>₃</small><small>⁻</small> ions, with maximum efficiency achieved within 10 minutes. When 0.025 g of resin was used, 75% of NO<small>₃</small><small>⁻</small> was removed, whereas with 0.05 g, 89% was removed, and with 0.1 g of resin, 95% was removed. At pH 1, approximately 50% of NO<small>₃</small><small>⁻</small> ions were removed, with removal efficiency reaching 97% between pH 4 and 10. Sorption isotherms affirm the suitability of the Langmuir model for the current investigation. The monolayer maximum sorption capacity (<em>q</em><small>_max</small>) value was found to be 53.65 mg g<small>⁻¹</small>. The resin demonstrates robust desorption capabilities using 0.1 M hydrochloric acid (HCl), effectively desorbing NO<small>₃</small><small>⁻</small> above 99%, indicating easy NO<small>₃</small><small>⁻</small> desorption and resin regeneration. The presence of coexisting ions such as chloride (Cl<small>⁻</small>), sulfate (SO<small>₄</small><small>²⁻</small>), and phosphate (PO<small>₄</small><small>³⁻</small>) showed a minimal impact on NO<small>₃</small><small>⁻</small> removal in individual binary mixtures, with efficiencies exceeding 93%, suggesting a strong selectivity of the resin towards NO<small>₃</small><small>⁻</small>. Purolite SSTA63 anion exchange resin exhibited a high affinity for NO<small>₃</small><small>⁻</small> ions, even over other competing ions, despite the general trend of ion exchange resins to favor ions with a higher atomic number and valence. Overall, this resin presents a promising solution for NO<small>₃</small><small>⁻</small> removal, with implications for water treatment and environmental remediation.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176488","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}

{"title":"Effect of ferrous sulfate treatment on microbially influenced corrosion of CuNi 70/30 marine pipeline alloy by sulfate reducing bacteria†","authors":"M. A. Javed, W. C. Neil and S. A. Wade","doi":"10.1039/D4EW00382A","DOIUrl":"10.1039/D4EW00382A","url":null,"abstract":"<p >This study investigates the effect of ferrous sulfate (FeSO<small>₄</small>) treatment on protective film formation and subsequent microbially influenced corrosion (MIC) of CuNi 70/30 pipeline alloy, a material commonly used in maritime platforms. CuNi 70/30 coupons were treated with FeSO<small>₄</small> solution in potable water and seawater simulating a flow speed of 0.94 m s<small>⁻¹</small> for 5 d. The treated coupons exhibited a protective iron oxyhydroxide, likely lepidocrocite (γ FeOOH), film on the surface. MIC performance was evaluated in modified Baar's medium with SRB for 28 d. Results revealed thicker SRB biofilm and increased MIC pitting attack on FeSO<small>₄</small> treated coupons compared to untreated coupons. These findings suggest that FeSO<small>₄</small> treatment may exacerbate MIC susceptibility in MIC-prone environments, highlighting the importance of carefully considering corrosion mitigation strategies in maritime platform applications.</p>","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176499","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}

{"title":"A novel graphene oxide–microalgae hybrid material for the removal of pentavalent arsenic from natural water and industrial wastewater","authors":"Eliana S. Lemos, Evelyn M. Valdés Rodríguez, Adrián Bonilla Petriciolet, Andrea M. Ray, Leticia B. Escudero","doi":"10.1039/d4ew00308j","DOIUrl":"https://doi.org/10.1039/d4ew00308j","url":null,"abstract":"In this study, a hybrid bionanomaterial (GO@Di) composed of <em>Dictyosphaerium</em> sp. microalgae and graphene oxide (GO) was synthesized for the first time to be used as an adsorbent for the removal of pentavalent arsenic (As(<small>V</small>)) from aqueous solutions. GO@Di was characterized by analytical techniques including Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), pH at point of zero charge (pH<small>_PZC</small>), and BET surface analysis. Solution pH, adsorbent mass, initial concentration of the pollutant, and ionic strength were evaluated and optimized to identify the best conditions for As(<small>V</small>) removal using GO@Di. A removal efficiency of 69% and an adsorption capacity of 885 mg g<small>⁻¹</small> were obtained under the optimal conditions of pH 3, 1 mg of GO@Di and initial As(<small>V</small>) concentration of 50 mg L<small>⁻¹</small>. The adsorption kinetics were also analyzed, reaching the equilibrium at 120 min. The experimental kinetic results were correlated with the pseudo-second order model. Equilibrium data were fitted with the Brunauer–Emmett–Teller (BET) isotherm model. Regeneration studies indicated that GO@Di could be re-used efficiently up to 4 adsorption/desorption cycles. Finally, GO@Di was applied to real samples of natural waters and industrial effluents, obtaining removal percentages between 52 and 95%, which demonstrated the promising potential of GO@Di to depollute complex aqueous matrices containing As(<small>V</small>). Future studies will focus on the removal of other arsenical species using GO@Di and its implementation in dynamic adsorption systems.","PeriodicalId":75,"journal":{"name":"Environmental Science: Water Research & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142176496","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}