Varuna S. Watwe, Sunil D. Kulkarni and Preeti S. Kulkarni*,
{"title":"Valorizing Cr(III) in a Microwave-Assisted Fenton-like System for Sustainable Dye Degradation and Resource-Efficient Wastewater Treatment","authors":"Varuna S. Watwe, Sunil D. Kulkarni and Preeti S. Kulkarni*, ","doi":"10.1021/acssusresmgt.5c00281","DOIUrl":"https://doi.org/10.1021/acssusresmgt.5c00281","url":null,"abstract":"<p >One of the major environmental challenges today is the effective removal of synthetic dyes from industrial wastewater. The current study developed a Fenton-like oxidation system mediated by Cr(III) and assisted by microwave radiation at 2.45 GHz to rapidly degrade Rhodamine B (RhB). The process achieved 98% RhB degradation in 90 s under ideal batch conditions, which included a pH of 6, 0.5 mM Cr(III), 19.4 mM H<sub>2</sub>O<sub>2</sub>, 0.07 mM RhB, and 520 W of microwave power. Total organic carbon analysis indicated that the system achieved 55% mineralization of RhB. The hydroxyl radical was identified by fluorescence spectroscopy as the primary reactive oxygen species in this process, and UV–visible studies examined degradation kinetics. Major intermediates, including oxalic acid, methanediol, and phthalic acid, were identified by GC–MS/MS. In comparison to RhB, toxicity evaluations using the EPA’s TEST software revealed that more than 80% of the degradation products were less toxic, nonbioaccumulative, and nonmutagenic. The process capitalizes on the circular reuse of Cr(III), a common industrial waste component, as a catalytic agent. Microwave irradiation improved reaction kinetics, expanded the pH range, and lowered energy input. Additionally, transient Cr(VI) formation provided a secondary catalytic cycle without persistent toxicity. Although moderate levels of Cr(VI) were observed after multiple reuse cycles (25 mg L<sup>–1</sup>), these can be mitigated through post-treatment reduction, ensuring compliance with discharge regulations. These results position the Cr(III)-MW-Fenton system as a rapid, energy-efficient, and environmentally safe method for sustainable wastewater treatment.</p>","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 8","pages":"1580–1592"},"PeriodicalIF":0.0,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906729","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":"Electrosynthesized Metal/Polymer Hybrid: Unlocking Selective Formate Production via CO2 Electroreduction","authors":"Evin Jacob, and , Anitha Varghese*, ","doi":"10.1021/acssusresmgt.5c00204","DOIUrl":"https://doi.org/10.1021/acssusresmgt.5c00204","url":null,"abstract":"<p >Carbon dioxide reduction via electrochemical means offers a sustainable pathway to mitigate CO<sub>2</sub> emissions and synthesize value-added chemicals. Here, we report the synthesis and performance of a metal/polymer-carbon paper (Cu<sub><i>x</i></sub>O<sub><i>y</i></sub>/PoPD/CFP) electrode prepared via a simple two-step in situ electrodeposition method for the electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>ER). Unlike most reported catalysts that yield multiple liquid products and complicate downstream separation processes, Cu<sub><i>x</i></sub>O<sub><i>y</i></sub>/PoPD/CFP selectively produces formate as the sole liquid product across all of the test potentials. The amine-rich and porous PoPD matrix synergistically enhanced CO<sub>2</sub> capture, provided a conductive scaffold for efficient electron transfer, and facilitated intimate interfacial contact with copper oxides, enabling improved catalytic performance. The catalyst demonstrated an onset potential of ∼−0.27 V (vs RHE) and achieved a faradaic efficiency of 72.6% for formate with a current density of 6.70 mA/cm<sup>2</sup> at −0.80 V (vs RHE). Studies showcased an electrochemically active surface area (ECSA) of 16.625 cm<sup>2</sup> and a roughness factor of 8.31. The long-duration electrolysis experiment demonstrated stable performance for an extended period, maintaining continuous electrolysis for up to 9.5 h without significant fluctuations or degradation in activity.</p>","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 8","pages":"1437–1448"},"PeriodicalIF":0.0,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906766","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":"Fabrication and Modularization of Li(NiCoAl)/Bi(K)OCl Three-Dimensional Intercalated Photocatalysts by Using Cathode Materials of Retired Lithium Batteries and Their Particular Photocatalytic Performance","authors":"Kexin Li, and , Xubiao Luo*, ","doi":"10.1021/acssusresmgt.5c00245","DOIUrl":"https://doi.org/10.1021/acssusresmgt.5c00245","url":null,"abstract":"<p >In this paper, powder Li(NiCoAl)-<i>x</i>/Bi(K)OCl<sub>6</sub> and modular Li(NiCoAl)-5/Bi(K)OCl<sub>6</sub>@PSA photocatalysts with unique oxidation properties were successfully constructed by a simple synthesis strategy using the cathode material Li(NiCoAl)O<sub>2</sub> of a retired lithium battery as a precursor. The as-prepared Li(NiCoAl)-<i>x</i>/Bi(K)OCl<sub>6</sub> powder photocatalysts show excellent photocatalytic oxidation abilities for degrading typical organic pollutants (OPs) in water and depolymerizing natural lignin to prepare vanillin due to their particular three-dimensional intercalated microstructures, unique photoelectric properties, and improved photogenerated carrier (e<sup>–</sup>–h<sup>+</sup>) separation efficiencies. The as-prepared Li(NiCoAl)-5/Bi(K)OCl<sub>6</sub>@PSA modular photocatalyst is convenient to separate and recover and has similar photocatalytic oxidation ability to the corresponding powder photocatalyst, so it has potential application value. Compared with the photocatalytic oxidation process, potassium peroxymonosulfate (KHSO<sub>5</sub>) can be activated by Ni<sup>+2</sup> and Co<sup>+2</sup> low-valence transition-metal elements in Li(NiCoAl)-<i>x</i>/Bi(K)OCl<sub>6</sub> and Li(NiCoAl)-5/Bi(K)OCl<sub>6</sub>@PSA, so the target degradation objects can be degraded more quickly in the synergistic advanced oxidation process. The recycling experiments show that the as-prepared Li(NiCoAl)-5/Bi(K)OCl<sub>6</sub>@PSA modular photocatalyst has a high performance stability.</p>","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 8","pages":"1517–1527"},"PeriodicalIF":0.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906701","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":"Preparation and Studies of ZnFe2O4–CeO2 Nanopowder via Self Combustion Glycine Nitrate Process for Methanol Steam Reforming Hydrogen Production","authors":"Shu-Han Juang, Chung-Lun Yu, Subramanian Sakthinathan, Tetsu Yonezawa, Ching-Lung Chen, Te-Wei Chiu* and Naratip Vittayakorn*, ","doi":"10.1021/acssusresmgt.5c00140","DOIUrl":"https://doi.org/10.1021/acssusresmgt.5c00140","url":null,"abstract":"<p >As fossil fuels have finite resources and environmental drawbacks, there’s a growing interest in cleaner, renewable energy. Hydrogen (H<sub>2</sub>) is seen as a promising alternative to petroleum due to its non-toxic, clean combustion that only produces water and avoids carbon dioxide emissions. In this study, different ratios of ZnFe<sub>2</sub>O<sub>4</sub>–CeO<sub>2</sub> nanopowder were synthesized via the glycine nitrate process (GNP). The ZnFe<sub>2</sub>O<sub>4</sub>–CeO<sub>2</sub> nanopowder catalyst was prepared by GNP, which was immensely porous and had a cotton-like structure. Moreover, the glycine nitrate process, which is a synthesis technology, can offer the advantages of low cost, simplicity, and speed and create a porous structure for the catalyst. The BET measurement revealed that the specific surface area of the as-combusted ZnFe<sub>2</sub>O<sub>4</sub>–CeO<sub>2</sub> nanopowder varied from 8.48 m<sup>2</sup>/g to 19.82 m<sup>2</sup>/g. Hydrogen production through the SRM process was monitored by using a gas chromatograph equipped with a thermal conductivity detector. The 20ZnFe<sub>2</sub>O<sub>4</sub>–80CeO<sub>2</sub> powder had the highest H<sub>2</sub> production without activation, reaching 7566.08 mL STP min<sup>–1</sup> g-cat<sup>–1</sup> at a reaction temperature of 550 °C achieved at an N<sub>2</sub> flow rate of 30 sccm. This study indicates that the glycine nitrate process imparts a porous structure to the catalyst, thereby increasing hydrogen production. Moreover, suitable incorporation of CeO<sub>2</sub> could improve the catalytic performance in the SRM process on hydrogen. Therefore, ZnFe<sub>2</sub>O<sub>4</sub>–CeO<sub>2</sub> nanopowders may have significant economic prospects.</p><p >Porous ZnFe<sub>2</sub>O<sub>4</sub>–CeO<sub>2</sub> nanopowders synthesized via glycine nitrate combustion effectively enhance hydrogen production from steam reforming of methanol, offering a promising, low-cost catalyst for sustainable energy applications.</p>","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 8","pages":"1416–1424"},"PeriodicalIF":0.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acssusresmgt.5c00140","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Régis Chenitz*, Elmira Pajootan and Asmae Mokrini,
{"title":"Future of Battery Grade Graphite Recycling from Spent Batteries","authors":"Régis Chenitz*, Elmira Pajootan and Asmae Mokrini, ","doi":"10.1021/acssusresmgt.5c00312","DOIUrl":"https://doi.org/10.1021/acssusresmgt.5c00312","url":null,"abstract":"<p >The future of sustainable energy storage depends on our ability to integrate recycled materials into the production cycle, reducing our reliance on mining resources and paving the way for a greener, more resilient energy landscape.</p>","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 8","pages":"1337–1339"},"PeriodicalIF":0.0,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acssusresmgt.5c00312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dalton W. Stewart, Wenjun Guo, Yalin Li, Xinxin Fan, Jonathan W. Coppess, Madhu Khanna and Jeremy S. Guest*,
{"title":"","authors":"Dalton W. Stewart, Wenjun Guo, Yalin Li, Xinxin Fan, Jonathan W. Coppess, Madhu Khanna and Jeremy S. Guest*, ","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":100015,"journal":{"name":"ACS Sustainable Resource Management","volume":"2 7","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":0.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acssusresmgt.4c00486","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}