Waste Disposal & Sustainable Energy最新文献

{"title":"Solid waste-azo dye degradation closed loop: bridging coal gangue recycling and azo dye removal","authors":"Chunjie Huang,&nbsp;Wenkang Qi,&nbsp;Yutong Yang,&nbsp;Ying Zhang,&nbsp;Jianwen Lu,&nbsp;Qiuxia Ye,&nbsp;Xingyong Xue,&nbsp;Yaocong Han,&nbsp;Qiaoqiao Su,&nbsp;Dongping Wei,&nbsp;Lihong Lan","doi":"10.1007/s42768-025-00247-0","DOIUrl":"10.1007/s42768-025-00247-0","url":null,"abstract":"<div><p>To address the dual challenges of coal gangue utilization and azo dye wastewater treatment, this study developed cobalt-loaded geopolymer microsphere catalysts (Co@CGM) through the resource utilization of coal gangue for peroxymonosulfate (PMS) activation, achieving efficient degradation of azo dyes sunset yellow (SY) and amaranth red (AR). Single-factor experiments demonstrated that Co@CGM exhibited exceptional catalytic performance at ultra-low PMS concentrations (0.25–0.50 mmol/L), achieving degradation efficiencies of 99.38% for SY and 99.91% for AR within 30 min for 100 mL solutions at 50 mg/L concentration. Stability tests revealed that Co@CGM maintained significant PMS activation effectiveness through five degradation cycles, demonstrating strong acid-base resistance (pH=3–9) and excellent anion interference resistance (Cl⁻, NO₃⁻, H₂PO₄⁻, etc.). Quenching experiments and electron paramagnetic resonance spectrometer (EPR) analysis confirmed that singlet oxygen (¹O₂) served as the primary reactive species driving the rapid degradation process in both SY and AR systems. Liquid chromatography-mass spectrometer (LC-MS) analysis identified intermediate products and proposed degradation pathways for both dyes. This work successfully developed an eco-friendly functional material through coal gangue waste recycling, achieving the goal of “treating waste with waste” in azo dye wastewater remediation.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"353 - 369"},"PeriodicalIF":0.0,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance evaluation of a Dracaena plant-based microbial fuel cell utilizing municipal solid waste compost as substrate and stainless steel mesh-supported 3D Cassia Fistula as bioanode","authors":"Kumar Sonu,&nbsp;Zainab Syed,&nbsp;Gurpreet Singh,&nbsp;Manoj Kumar Tiwari,&nbsp;Monika Sogani","doi":"10.1007/s42768-025-00244-3","DOIUrl":"10.1007/s42768-025-00244-3","url":null,"abstract":"<div><p>The increasing demand for sustainable energy solutions has driven research into plant microbial fuel cells (PMFCs) as a renewable bioelectricity sources. This study evaluated the performance of a <i>Dracaena</i> plant-based PMFC utilizing a 3D biomass anode derived from <i>Cassia fistula</i> and varying percentage of municipal solid waste compost (MSWC) to enhance power generation and plant growth. The 3D anode was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA), confirming its porous structure, high carbon content, and thermal stability, which facilitate microbial colonization and electron transfer. Electrochemical analysis revealed that the 3D anode exhibited superior charge transfer efficiency compared to the control anode. The highest power density (204 mW/m²) and current density (255 mA/m²) were achieved with 30% compost, indicating an optimal balance between microbial activity and nutrient availability. Additionally, plant growth was significantly enhanced under 20%–30% compost treatments, while excessive compost (&gt;40%) led to a decrease in performance. The results highlight the economic and environmental benefits of integrating biomass-derived electrodes and organic waste in PMFCs. This study demonstrates the feasibility of low-cost and sustainable materials for bioelectricity generation and plant growth enhancement, paving the way for further optimization and large-scale applications.</p><h3>Graphical abstract\u0000</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"453 - 467"},"PeriodicalIF":0.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recoverable biobased products from agro-food and industrial wastes: implications for wealth and health","authors":"Fetene Fufa Bakare,&nbsp;Tsion Chuni Akililu,&nbsp;Eset Negash Kebebew,&nbsp;Allah Dekama Jara,&nbsp;Hailemariam Gebru,&nbsp;Teshome Taye","doi":"10.1007/s42768-025-00243-4","DOIUrl":"10.1007/s42768-025-00243-4","url":null,"abstract":"<div><p>Wastes can be defined as unwanted materials that are dumped away from several sources. It can be a by-product of home, agricultural, industrial, commercial, mining, and other ventures, sources, or activities. Nowadays such waste materials are not just waste; they are becoming the source of wealth and health. A substantial volume of organic waste, around 1.3 billion tons per year, is identified as a possible source of feedstock for biobased goods. Waste materials are being used for the development of various useful products, such as bioenergy, biomaterials, biotechnology, and so on. Wastes are valuable resources for health and wealth creation, with an emphasis on resources recovered from environmental and agro-food wastes applying via biotechnology. This review focuses on biotechnological applications in waste valorizations and examines the health and economic effects of obtaining resources from agro-food and environmental wastes. According to the quantitative findings, producing biogas from agro-food sector waste can provide between 80 and 150 m³ of biogas for every ton of fresh organic waste, which result in significant energy savings and greenhouse gas mitigation. Furthermore, it has been suggested that converting just 10% of the world’s food waste may result in financial gains of over 100 billion USD in addition to reducing the health hazards related to trash disposal. By demonstrating that the valorization not only generates financial gains through the development of bioplastics and biofertilizers but also improves health outcomes by reducing pollution and improving food safety, the paper highlights the double advantages of waste recovery. Besides, it emphasizes the application of biotechnological methods, showcasing innovative and scientific approaches to resource recovery in which the reviewed findings will be relevant for industry stakeholders and policymakers.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"521 - 537"},"PeriodicalIF":0.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing anaerobic digestion of waste-activated sludge containing disposable face masks through hydrothermal pretreatment: improving methane production and reducing toxicity","authors":"Ming Liu,&nbsp;Xuezhi Wang,&nbsp;Ting Fan,&nbsp;Xiaoli Zhao","doi":"10.1007/s42768-025-00242-5","DOIUrl":"10.1007/s42768-025-00242-5","url":null,"abstract":"<div><p>Disposable face masks (DFMs), which are essential for mitigating the spread of infectious diseases like SARS-CoV-2, corona virus disease 2019 (COVID-19), Ebola, and tuberculosis, create significant environmental challenges due to improper disposal. DFMs frequently accumulate in waste-activated sludge (WAS), posing potential environmental hazards. Anaerobic digestion (AD) is typically employed to stabilize and recovery resource from WAS; however, the presence of DFMs substantially disrupts the AD process. This study explored the potential of integrating hydrothermal pretreatment (HTT) with AD to maximize methane yield while mitigating the toxicological impact of mask-derived pollutants. The HTT of polypropylene (PP) (primary constituent of masks) or masks was conducted in 100 mL stainless-steel reactors with a mass concentration of 4 g per 40 mL deionized water, heated at 2.5 °C/min to 160 °C for durations of 0.5, 1, and 2 h. HTT increased the surface roughness of PP, induced oxygenated functional groups (–OH and C=O), enhanced the leaching of dissolved organic carbon (DOC), and reduced hydrophobicity and relative crystallinity, effectively addressing the limitations of enzymatic hydrolysis. Compared to untreated masks, cumulative methane production increased by 16.2%, 31.5%, and 20.8% for HTT pretreatment at 160 °C for 0.5, 1, and 2 h, respectively. Microbial community analysis indicated that HTT increased the relative abundance of specific hydrolytic-acidifying (<i>Bacteroidota</i>, <i>Acidobacteria</i>, and <i>Desulfobacterota</i>), and methanogenic bacteria (<i>Methanosaeta</i> and <i>Candidatus_Methanofastidiosum</i>) in AD process. Phytotoxicity tests demonstrated that digestates from AD of HTT mask at 160 °C for 1 h increased germination index of plants by 18.1%. This study shows HTT is a promising method for enhancing AD efficiency and lowering DFMs toxicity.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"437 - 451"},"PeriodicalIF":0.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of heavy metal zinc and lead concentrations in waste incineration fly ash based on hyperspectral reflectance features","authors":"Wenyuan Wang,&nbsp;Liqiang Zhang,&nbsp;Fei Wang,&nbsp;Wei Xiong,&nbsp;Haibin Cui,&nbsp;Xinrong Wu,&nbsp;Guojun Lv,&nbsp;Lihong Zhang,&nbsp;Qiyu Gao","doi":"10.1007/s42768-025-00236-3","DOIUrl":"10.1007/s42768-025-00236-3","url":null,"abstract":"<div><p>Heavy metal contamination in waste incineration fly ash poses serious environmental and public health risks, necessitating efficient and precise detection methods. Traditional techniques require complex sample preparation and lengthy analysis, limiting their suitability for on-site or real-time monitoring. To address this, this study proposes a rapid detection method using visible and near-infrared reflectance spectroscopy to improve efficiency and reduce costs. Zn (zinc) and Pb (lead) spectral characteristics were analyzed through first-order differentiation (FD), second-order differentiation (SD), de-trending (DT), and logarithm of the reciprocal (LogInv) transformations, followed by continuous wavelet transform (CWT) to extract key bands (max |<i>r</i>|=0.78). A stacking model integrating partial least squares regression (PLSR), back-propagation neural network (BPNN), support vector regression (SVR), random forest (RF), and extreme gradient boosting (XGBoost) was developed to optimize spectral transformation and inversion modeling. Stacking outperformed individual models, achieving the highest accuracy for Zn (<i>R</i>²=0.748) and Pb (<i>R</i>²=0.735) with CWT-SD and CWT-FD transformation. BPNN exhibited overfitting in small samples, whereas PLSR was constrained by linear assumptions. In contrast, stacking combines the strengths of all the base models, improving accuracy and stability. This study elucidates the spectral characteristics of fly ash and validates the effectiveness of stacking in hyperspectral heavy metal prediction. The findings provide theoretical and technical support for efficient, non-destructive detection, with promising applications in waste incineration management and environmental monitoring.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 2","pages":"165 - 184"},"PeriodicalIF":0.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term microbial community dynamics in full-scale dry and wet anaerobic digesters for food waste","authors":"Jinlin Zou,&nbsp;Zhenchao Shi,&nbsp;Wei Peng,&nbsp;Hua Zhang,&nbsp;Fan Lü,&nbsp;Pinjing He","doi":"10.1007/s42768-025-00240-7","DOIUrl":"10.1007/s42768-025-00240-7","url":null,"abstract":"<div><p>This study investigated the long-term microbial community dynamics (nearly 200 d) in four full-scale dry anaerobic digestion (DAD) reactors and two wet anaerobic digestion (WAD) reactors for treating food waste. Compared with WAD, DAD demonstrated significantly higher operational instability under elevated concentrations of volatile fatty acids (VFAs, 8000–15000 mg/L) and total ammonia nitrogen (TAN, 5000–7500 mg/L), particularly during recovery phases following prolonged feeding interruption. 16S rRNA sequencing analysis revealed distinct microbial community structures between the two systems. In DAD, syntrophic acetate oxidation bacteria (SAOB) dominated by the genera <i>Halocella</i> and <i>DTU014</i> was significantly enriched, whereas the bacterial community in WAD was primarily characterized by <i>Defluviitoga</i>. Both systems exhibited hydrogenotrophic methanogenesis (HM) as the dominant pathway, with <i>Methanoculleus</i> being the prevalent archaeal genus in both configurations. Notably, <i>Methanobrevibacter</i> was exclusively detected in DAD. Furthermore, increasing VFA concentrations triggered a structural reorganization of microbial communities in DAD. The relative abundances of <i>Halocella</i> and <i>DTU014</i> decreased markedly under high-VFA stress, whereas <i>Methanobrevibacter</i> abundance was positively correlated with VFA accumulation. These findings highlight system-specific microbial resilience mechanisms and provide critical insights into VFA-driven community dynamics in anaerobic digestion systems. The results have practical implications for optimizing process stability and methane recovery efficiency in DAD, particularly under high organic loading or feedstock variability conditions.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"393 - 407"},"PeriodicalIF":0.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heavy metal stabilization and alkalis neutralization in municipal solid waste incineration fly ash using acid washing coupled with chelating agents","authors":"Tong Tian,&nbsp;Yaji Huang,&nbsp;Yixuan Xiao,&nbsp;Zhiyuan Li,&nbsp;Hu Pan,&nbsp;Zenghui Li,&nbsp;Qi Zhou","doi":"10.1007/s42768-025-00234-5","DOIUrl":"10.1007/s42768-025-00234-5","url":null,"abstract":"<div><p>Heavy metal stabilization and alkali neutralization are crucial for the management of municipal solid waste incineration fly ash (MSWI FA). In this study, the effects of oxalic acid (OA) and citric acid (CA) washing on heavy metal migration and alkali changes were investigated. Besides, three agents were selected to stabilize acid-washed fly ash (FA), and the effects of heavy metal stabilization under different disposal environments and the changes in their form distributions were comparatively analyzed. The experimental results demonstrated that with increasing organic acid concentration, the amount of Cd and Pb extracted from MSWI FA increased, whereas the amount of alkalis tended to decrease. Moreover, the leaching concentration of heavy metals and the percentage of unstable forms increased after acid washing. The alkalis content in the products decreased to 7.91–8.75 after stabilization, which met the standards of hazardous waste landfills. Compared with other agents, sodium diethyldithiocarbamate (DDTC) exhibited excellent heavy metal stabilization performance. After the addition of 1% DDTC, the leaching concentrations of Cd and Pb decreased to values lower than the national standard limit. Additionally, the curing rates of Cd and Pb were greater than 98% under the two leaching conditions. With the addition of DDTC, the percentage of stable forms increased, and the percentages of stable Cd and Pb forms increased to 87.68% and 99.03%, respectively, after treatment with 2% DDTC. The above results corroborated that CA coupled with DDTC stabilization can significantly reduce Cd and Pb toxicity and neutralize alkalinity in FA.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 2","pages":"273 - 286"},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing grounding systems: effects of agro-based biochar used as backfill materials","authors":"Jemima Akoto,&nbsp;Solomon Nunoo,&nbsp;James Ransford Dankwah","doi":"10.1007/s42768-025-00224-7","DOIUrl":"10.1007/s42768-025-00224-7","url":null,"abstract":"<div><p>Agro-waste biochar is gradually emerging as a greener and effective means of enhancing the effectiveness of grounding systems. Yet, only a few of such wastes have been empirically assessed as ground enhancing materials. In this study, field-based soil resistivity and resistance to ground (RTG) value monitoring was used to assess the potential of biochar of coconut husk, sawdust, sugarcane bagasse, and rice husk as alternate ground enhancing materials vis-a-vis their susceptibility to seasonal variation and mode of application. The result of this study shows that the applied treatments exerted significant improvement (<i>P</i>-value≤0.05) in soil resistance and zone of influence values with the latter ranging less than 1 m for the clayey soil and equal of more than 2 m in the sandy soil. These effects of the study treatments were significantly influenced by time. A notable finding of this study is that rainfall and high moisture results in physical breakdown of biochar. This has significant implications for the use of treatment and the mode of application of treatment. Treatment, time, and mode of application of treatment played significant and interdependent role in reducing soil resistivity. These factors contributed to over 83% improvement of RTG values. This result suggests that though treatment, time and mode of application of treatment are major factors determining the effectiveness of ground enhancing materials, other confounding variables (e.g. method of carbonizing the waste, physical and chemical properties of the biochar) are also important determinants and must engender future research.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"495 - 507"},"PeriodicalIF":0.0,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dye wastewater reuse: energy storage strategies for supercapacitors","authors":"Shan Song,&nbsp;Rongna Chen,&nbsp;Tianxiao Xie,&nbsp;Yide Luo,&nbsp;Zongtai Zhou,&nbsp;Junshuang Zhou,&nbsp;Faming Gao","doi":"10.1007/s42768-025-00237-2","DOIUrl":"10.1007/s42768-025-00237-2","url":null,"abstract":"<div><p>Supercapacitors have attracted much attention because of their fast charging and discharging characteristics, and the development of high-efficiency carbon materials plays a crucial role in improving the performance and application of supercapacitors. The strategy of “killing two birds with one stone” to achieve dye wastewater treatment and improve the pseudo-capacitance of electrode materials provides an environmentally friendly and cost-effective solution for dye wastewater treatment. This work successfully used a simple one-step hydrothermal method of attaching dye molecules to glucose-derived carbon to treat dye wastewater and effectively used the functional groups in the dye molecules. Moreover, the structural agglomeration caused by hydrothermal carbonation was resolved, and the reticulated dye molecules improved the continuity within the material and provided additional channels for ion transport. The mixture was then annealed with NH₄F at high temperature, and the NH₄F activation introduced nitrogen atoms into the carbon material, increasing the electrical conductivity of the material and etching the surface of the material, increasing the number of active sites on the material. The optimum carbon material has a specific surface area of 727.09 m² g⁻¹, and the percentage of heteroatoms increases from 5.37% to 13.87%, an increase of 158.29%. In a three-electrode system with 6 mol L⁻¹ KOH as the electrolyte and a current density of 0.5 A g⁻¹, the material shows a specific capacitance of 191.5 F g⁻¹ and good multiplicative performance (77.4% capacitance retention after increasing the current to 20 times that of 0.5 A g⁻¹) as well as stability (essentially no change in capacitance after 5000 cycles).</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"509 - 520"},"PeriodicalIF":0.0,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative resource utilization of sludge and red mud: development of in-situ magnetic and floatable biochar for the adsorption of basic fuchsin","authors":"Jing Guo,&nbsp;Peizu Liu,&nbsp;Kai Cui,&nbsp;Dongsheng Feng,&nbsp;Junming Yi,&nbsp;Huidong Li","doi":"10.1007/s42768-025-00238-1","DOIUrl":"10.1007/s42768-025-00238-1","url":null,"abstract":"<div><p>The development of sustainable adsorbents that integrate low-cost separation and high contaminant removal efficiency remains a critical challenge in wastewater treatment. This study engineered a sludge-based magnetic floatable particle adsorbent (SMFA-800-0.5) through synergistic co-pyrolysis of municipal sludge, red mud, and hollow glass microspheres (HGM) for the removal of basic fuchsin (BF) from dye wastewater. The results indicated that the dual-function separation approach utilizing Fe₃O₄ in situ formation from red mud (magnetization of 8.24 A·m⁻¹) enables excellent recovery efficiency, eliminating the need for external Fe precursors, while the integration of HGM provides a self-floating capability with 76% surface retention over 3 h. The sludge-derived carbon matrix, enhanced by HGM’s structural support, provides hierarchical pores with a Bruner–Emmett–Teller (BET) surface area of 57.98 m²·g⁻¹. The addition of bentonite clay effectively addresses powder dispersion issues in flow systems. This material demonstrates superior adsorption performance, achieving a capacity of 106.72 mg·g⁻¹ for BF via pseudo-first-order kinetics. The enhanced adsorption performance is driven by multi-mechanism synergies, including electrostatic attraction and pore filling. This work pioneers a “zero-external-input, dual-recovery” paradigm for sustainable dye removal.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":807,"journal":{"name":"Waste Disposal & Sustainable Energy","volume":"7 3","pages":"421 - 435"},"PeriodicalIF":0.0,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145078842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}