ACS ES&T engineering最新文献_第9页

Laser-Induced Graphene-Based Thin Film Composite Nanofiltration Membrane with Electrochemical Fouling Cleaning 激光诱导石墨烯基薄膜复合纳滤膜及其电化学污垢清洗

IF 6.3

ACS ES&T engineering Pub Date : 2026-07-10 Epub Date: 2026-06-22 DOI: 10.1021/acsestengg.6c00095

Rupam Nandan, Swatantra Pratap Singh

{"title":"Laser-Induced Graphene-Based Thin Film Composite Nanofiltration Membrane with Electrochemical Fouling Cleaning","authors":"Rupam Nandan, Swatantra Pratap Singh","doi":"10.1021/acsestengg.6c00095","DOIUrl":"10.1021/acsestengg.6c00095","url":null,"abstract":"Organic fouling remains a significantchallenge for conventionalnanofiltration (NF) membranes, which often require chemical cleaning,thereby increasing operational costs. Electroconductive membranes(ECMs) are a new generation of membranes that offer both electroconductiveproperties and filtration performance. However, NF-ECMs are the leastexplored to date. This study focuses on the fabrication of a laser-inducedgraphene (LIG)-based nanofiltration (LIG-NF) membrane to evaluateits performance in removing foulants, followed by an electrocleaninginvestigation. First, the LIG was fabricated on a carbon-rich substratewith a CO2 laser, and then polysulfone (PSf) was coatedon it. A top polyamide (PA) layer was incorporated and optimized forsuperior permselectivity; the resulting membrane was subsequentlyphysicochemically and electrochemically characterized. The LIG-NFmembrane exhibited salt rejections of ∼82% and ∼40%for bi- and monovalent salts, respectively, with a pure water permeabilityof 6 LMH bar–1. This hydrophilic membrane demonstratedstable cyclic voltammetry over 25 scans. Furthermore, the foulingstudy showed an improvement in flux recovery from 85% to 100% whenan external 5 V potential was applied for 5 min during electrocleaning,compared to the control. The cleaning was verified by impedance spectroscopywith charge transfer resistance measurements. A flux recovery of ∼99%was achieved in crossflow after multiple-cycle runs, demonstratingthe process’s stability, scalability, and feasibility. Thepossible cleaning mechanism included a dominant role of electrostaticrepulsion and radical-species-based degradation. This study demonstratesa novel class of fouling-resistant, electroconductive NF membranesthat require no chemical cleaning, illustrating their potential asnext-generation membranes for sustainable water treatment systems.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 7","pages":"1962–1971"},"PeriodicalIF":6.3,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148656300","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}

引用次数: 0

Dual-Pronged Approach: Efficient Recovery of Mercury from Coal-Fired Flue Gas via Swirl-Diffusion Mercury Enrichment Coupled with High Purified HgSe Extraction 双管齐下的方法：旋流扩散富集与高纯度HgSe萃取联合有效回收燃煤烟气中的汞

IF 6.3

ACS ES&T engineering Pub Date : 2026-07-10 Epub Date: 2026-06-26 DOI: 10.1021/acsestengg.6c00360

Rihong Xiao, Yili Zhang, Wei Yang, Daorong Sun, Changxin Luo, Xiangzheng Cui, Zhuo Xiong, Junying Zhang, Yongchun Zhao

{"title":"Dual-Pronged Approach: Efficient Recovery of Mercury from Coal-Fired Flue Gas via Swirl-Diffusion Mercury Enrichment Coupled with High Purified HgSe Extraction","authors":"Rihong Xiao, Yili Zhang, Wei Yang, Daorong Sun, Changxin Luo, Xiangzheng Cui, Zhuo Xiong, Junying Zhang, Yongchun Zhao","doi":"10.1021/acsestengg.6c00360","DOIUrl":"10.1021/acsestengg.6c00360","url":null,"abstract":"Modified magnetospheres (MAG) as a regenerable adsorbentoffera promising alternative to conventional activated carbon injection(ACI) for mercury removal from flue gas. However, large-scale applicationfaces challenges in achieving uniform flue gas dispersion and in high-valuerecovery of desorbed mercury vapor from spent MAG rich in mercury.In this study, a dual strategy combining swirl injection and value-addedHgSe recovery was developed. The swirl injection model was validatedat a 315 MW coal-fired power plant, reducing mercury in flue gas to0.035 μg/m3, with swirl pressure identified as akey factor. An in situ selenium-based recovery agent (I–Se/SiO2) selectively stabilized desorbed Hg0, and DFTcalculations indicated that it had significantly higher selectivitytoward Hg0 than HgCl2 under flue gas conditions.Continuous field operation achieved 100% mercury recovery as pureHgSe (99.97%) with superior optical properties. Economic analysisshowed that system investment and operating costs were only 32% and19% of those for ACI, with a payback period under one year. This workestablishes a new paradigm integrating end-of-pipe mercury abatementwith resource recovery in coal-fired power plants.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 7","pages":"2027–2043"},"PeriodicalIF":6.3,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148672546","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}

引用次数: 0

Establishing Evidence-Based Standards for PFAS Destruction Pathway Claims 建立PFAS破坏途径声明的循证标准

IF 6.3

ACS ES&T engineering Pub Date : 2026-07-10 Epub Date: 2026-06-11 DOI: 10.1021/acsestengg.6c00201

Shuhan Xu, Shuang Wang, Zhenyu Kang, Junhe Lu, Andrew R. Zimmerman, James Kilduff, Bin Gao

{"title":"Establishing Evidence-Based Standards for PFAS Destruction Pathway Claims","authors":"Shuhan Xu, Shuang Wang, Zhenyu Kang, Junhe Lu, Andrew R. Zimmerman, James Kilduff, Bin Gao","doi":"10.1021/acsestengg.6c00201","DOIUrl":"https://doi.org/10.1021/acsestengg.6c00201","url":null,"abstract":"Research on per- and polyfluoroalkyl substances (PFAS)destructionincreasingly invokes claims regarding PFAS removal, defluorination,acceptable end points, and transformation pathways. However, the evidentiarybasis supporting these claims remains inconsistently interpreted andoften relies on indirect metrics that cannot support all forms ofconclusion equally. In this Perspective, we propose a shared evidentiaryladder for PFAS destruction studies and show how it can be appliedin two related but distinct ways: a practical evidentiary frameworkfor treatment-relevant claims and a mechanistic evidentiary frameworkfor pathway-relevant claims. Evidence is organized hierarchicallyfrom narrative inference and indirect metrics to partial product identification,mass balance closure, and direct mechanistic confirmation. By distinguishingwhat the same evidence base can support in treatment-oriented versusmechanism-oriented interpretation, this framework provides a basisfor reducing overinterpretation, improving transparency, and strengtheningcomparability across PFAS destruction studies.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 7","pages":"1941–1949"},"PeriodicalIF":6.3,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148666496","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}

引用次数: 0

Enhancement of Per- and Polyfluoroalkyl Substance Uptake from Contaminated Soil by Applying Plant Growth Regulators: Screening and Cross-Species Evaluation 植物生长调节剂促进污染土壤对全氟和多氟烷基物质的吸收：筛选和跨物种评价

IF 6.3

ACS ES&T engineering Pub Date : 2026-07-10 Epub Date: 2026-06-05 DOI: 10.1021/acsestengg.6c00068

Aswin Kumar Ilango, Oya Aydin Urucu, Madhav Kharel, Yanna Liang

{"title":"Enhancement of Per- and Polyfluoroalkyl Substance Uptake from Contaminated Soil by Applying Plant Growth Regulators: Screening and Cross-Species Evaluation","authors":"Aswin Kumar Ilango, Oya Aydin Urucu, Madhav Kharel, Yanna Liang","doi":"10.1021/acsestengg.6c00068","DOIUrl":"10.1021/acsestengg.6c00068","url":null,"abstract":"Innovative approachesare urgently needed to improve the phytoremediationof complex mixtures of per- and polyfluoroalkyl substances (PFAS)in contaminated soils. This study investigated the effectiveness ofplant growth regulators (PGRs) in enhancing the uptake of a mixtureof eight PFAS (100 μg/kg each) by Timothy grass (TG) from soil.A suite of PGRs including auxins (indole-3-acetic acid [IAA], indole-3-butyricacid [IBA]), gibberellic acid (GA), jasmonic acid, α-naphthaleneaceticacid, and 2,4-dichlorophenoxyacetic acid) was applied individuallyvia foliar spray at concentrations ranging from 0.1 to 200 μM.Among all treatments, IBA at 10 μM (IBA-10), IAA-1, and GA at0.1–1 μM significantly enhanced shoot accumulation ofPFHxA and PFHpA, with maximum uptake reaching ∼23% in TG duringthe second harvest (days 55–108). Compared to the controlswithout exposure to PGRs, this enhancement was ∼63%. In addition,PGRs enhanced the translocation of long-chain PFOS and PFNA, withincreases of 45–82% over the controls. Uptake of ΣPFASpeaked around 7–9% of the total spiked mass for those withIBA-10, IAA-1, or GA-1/GB-0.1, underscoring the importance of typeand concentration of PGRs in enhancing phytoextraction. Similar resultswere also observed for alfalfa undergoing similar treatment with PGRs.Insight from both TG and alfalfa indicates that not all PGR applicationsled to enhanced biomass weight and PFAS uptake percentage. Some treatmentsincreased tissue PFAS concentrations without improving biomass dryweight, while others enhanced biomass but resulted in only modestincreases in PFAS translocation. These results demonstrate that somefoliar-applied phytohormones can regulate PFAS accumulation in plants,offering a potential strategy to improve phytoextraction efficiency.The underlying mechanisms, however, will need to be further elucidated.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 7","pages":"1950–1961"},"PeriodicalIF":6.3,"publicationDate":"2026-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148443641","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}

引用次数: 0

Stable Single-Pass Electrochemical Oxidation of Trace 1,4-Dioxane in Groundwater via Multistage Reactors with Current Pulsing 电流脉冲多级反应器稳定单道氧化地下水中痕量1,4-二恶烷

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-26 DOI: 10.1021/acsestengg.6c00122

Shasha Yang, Leslie Arrazolo, Fabian S. Menges, Ian H. Billinge, Kwan Lam Yip, Jae-Hong Kim

{"title":"Stable Single-Pass Electrochemical Oxidation of Trace 1,4-Dioxane in Groundwater via Multistage Reactors with Current Pulsing","authors":"Shasha Yang, Leslie Arrazolo, Fabian S. Menges, Ian H. Billinge, Kwan Lam Yip, Jae-Hong Kim","doi":"10.1021/acsestengg.6c00122","DOIUrl":"10.1021/acsestengg.6c00122","url":null,"abstract":"Electrochemical oxidation (EO) can destroy a broad rangeof watercontaminants, but single-stage, single-pass reactors often requirehigh energy input and low water flux to achieve meaningful removal,limiting practical deployment. These constraints are acute for 1,4-dioxane,a persistent groundwater contaminant and potential human carcinogen,where long-term operation in low-conductivity water matrices is furtherhindered by anode degradation, cathodic scaling, and formation ofharmful byproducts. Here, we develop and validate a scalable strategythat combines a multistage, flow-through EO reactor with on/off currentpulsing using commercially available Ti4O7 meshanodes. In a laboratory electrolyte (50 mM NaClO4), 1,4-dioxanedegradation in a single-stage cell followed pseudo-first-order kinetics(k = 0.103 min–1), and stagingsubstantially increased single-pass removal across practical fluxes.In synthetic groundwater, pulsed operation markedly suppressed mineralscaling and reduced perchlorate byproduct formation by 44–82%relative to direct-current electrolysis while improving operationalstability. Integrating staging with pulsing delivered the most durableperformance: a four-stage reactor operated at 15 s on/15 s off maintainedstable treatment in groundwater at an environmentally relevant 1,4-dioxaneconcentration (0.1 mg/L), achieving 60–80% single-pass removal(average ∼70%) over 20 days with minimal voltage rise. Theseresults demonstrate that coupling reactor staging with pulsed electrolysismitigates key failure modes and byproduct risks, providing a practicaldesign and operating framework for long-lasting EO as point-of-use/point-of-entrytreatment of trace contaminants in groundwater.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 6","pages":"1830–1838"},"PeriodicalIF":6.3,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148269900","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}

引用次数: 0

Metagenomics Reveals the Particle Size Effects of Polyethylene Terephthalate Microplastics on Anaerobic Digestion 元基因组学揭示聚对苯二甲酸乙二醇酯微塑料粒径对厌氧消化的影响

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-25 DOI: 10.1021/acsestengg.6c00242

Xinyu Ai, Hongyu Tian, Tang Yang, Feng Ju, Jianwei Liu

{"title":"Metagenomics Reveals the Particle Size Effects of Polyethylene Terephthalate Microplastics on Anaerobic Digestion","authors":"Xinyu Ai, Hongyu Tian, Tang Yang, Feng Ju, Jianwei Liu","doi":"10.1021/acsestengg.6c00242","DOIUrl":"10.1021/acsestengg.6c00242","url":null,"abstract":"Polyethyleneterephthalate microplastics (PET-MPs) areamong themost prevalent microplastics in activated sludge; however, the mechanismunderlying its impact on anaerobic digestion (AD) remain unclear.Through batch experiments and simulated substrate experiments, thisstudy found that PET-MPs exhibited particle size-dependent effectsacross the various phases of AD. Results indicated that 50 μmPET-MPs particles enhanced methane production, whereas 200 μmparticles inhibited the process. Specifically, 50 μm PET-MPsprimarily accelerated the acidogenesis and methanogenesis phases,while 200 μm PET-MPs predominantly affected the dissolutionand hydrolysis phases. Scanning electron microscopy (SEM) coupledwith metagenomic analysis revealed that the surface of PET-MPs becameroughened during AD, leading to an increased specific surface area.This morphological change selectively enriched hydrogenotrophic methanogenssuch as Candidatus_Methanoculleus_thermohydrogenotrophicum and activated their corresponding metabolic pathways, including mthB and mcrA. Mechanistic analysis indicatedthat PET-MPs enhance methane production by (i) providing a biointerfacefor hydrogenotrophic methanogen colonization, (ii) promoting protein-derivedsubstrate fluxes that elevate H2 and acetate availability,and (iii) enabling coactivation of acetoclastic and hydrogenotrophicpathways. This study provides new insights into microplastic removaland the enhancement of sludge resource utilization.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 6","pages":"1895–1906"},"PeriodicalIF":6.3,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148666644","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}

引用次数: 0

Reconsidering Septic Tanks 重新考虑化粪池

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-26 DOI: 10.1021/acsestengg.6c00129

Tibo Roelants, Min Zheng, Bart Saerens, Myrthe Van Hal, Mark C. M. van Loosdrecht, Zhiguo Yuan, Eveline I. P. Volcke

{"title":"Reconsidering Septic Tanks","authors":"Tibo Roelants, Min Zheng, Bart Saerens, Myrthe Van Hal, Mark C. M. van Loosdrecht, Zhiguo Yuan, Eveline I. P. Volcke","doi":"10.1021/acsestengg.6c00129","DOIUrl":"https://doi.org/10.1021/acsestengg.6c00129","url":null,"abstract":"Septic tanks remainwidely used as decentralized sanitation systems,yet their environmental implications are often underestimated. Thisperspective reassesses their role regarding three main aspects. First,the traditional advantages of septic tanks are highly context-specific.While they provide effective solid retention and promote partial carbonbreakdown under anaerobic conditions, these benefits are most relevantin the absence of sewer infrastructure. When connected to the sewersystem, their use provides limited benefit and may introduce unintendedsystem-level drawbacks. Moreover, the removal of biodegradable carbonin septic tanks lowers the biochemical oxygen demand over nitrogen(BOD/N) ratio entering centralized wastewater treatment plants, increasingthe need for external carbon dosing for denitrification and addingsubstantial financial and indirect greenhouse gas burdens. Furthermore,septic tanks are a significant source of methane. Measured emissionsare of similar or even greater magnitude than those from centralizedwastewater treatment and represent non-negligible shares of city-and country-scale greenhouse gas inventories. Overall, it is concludedthat septic tanks warrant reconsideration when connected to a sewer.Improved inventories, refined emission models, and an evaluation ofsewer methane dynamics are necessary to inform future management strategiesand to determine when septic tanks should be phased out or betterkept in operation.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 6","pages":"1741–1753"},"PeriodicalIF":6.3,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148672669","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}

引用次数: 0

Advances in Biochar-Based Slow-Release Fertilizers: Production Techniques and Their Applications 生物炭基缓释肥料的研究进展：生产技术及应用

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-19 DOI: 10.1021/acsestengg.5c00894

Baojun Yi, Xinyi Huang, Maheshika Senanayake, Jiaqi Deng, Pavani Dulanja Dissanayake, Binoy Sarkar, Yong Sik Ok

{"title":"Advances in Biochar-Based Slow-Release Fertilizers: Production Techniques and Their Applications","authors":"Baojun Yi, Xinyi Huang, Maheshika Senanayake, Jiaqi Deng, Pavani Dulanja Dissanayake, Binoy Sarkar, Yong Sik Ok","doi":"10.1021/acsestengg.5c00894","DOIUrl":"10.1021/acsestengg.5c00894","url":null,"abstract":"The practical application of biochar-based slow-releasefertilizers(BSRFs) in sustainable agriculture has been steadily increasing dueto their considerable potential to enhance crop yields, promote soilhealth, and alleviate negative environmental impacts. This reviewpaper explored the methods used to produce BSRFs, including nutrientretention and release mechanisms. It aimed to integrate fragmentedresearch, identify the optimal preparation approaches, and bridgethe gap between laboratory findings and field applications. This studyprovided practical guidance for sustainable agricultural developmentby outlining key production methods that could enhance the use efficiencyof BSRFs, including in situ pyrolysis, co-pyrolysis, impregnation,encapsulation, and granulation. A critical analysis of the publishedapproaches suggested that an integrated production method was themost effective to provide high-performance BSRFs. The applicationof BSRFs was found to effectively improve the soil’s physical,chemical, and microbiological properties, while also enhancing thefertilizer use efficiency by up to 45%. The application of BSRFs improvedcrop growth and productivity, with increases ranging from 26% to 67%.From a mechanistic perspective, BSRFs reduced nutrient losses, particularlynitrogen leaching, by up to 71%, while enabling a controlled releaseprofile that aligned with the dynamic nutritional demands of growingplants. Therefore, BSRFs are a viable strategy for minimizing agriculturalpollution and supporting environmentally friendly crop production.Despite these benefits, there are still no standardized protocolsfor large-scale BSRFs manufacturing. Furthermore, long-term fieldtrials are urgently required in order to evaluate the agronomic effectiveness,environmental safety, and overall sustainability of BSRFs in a varietyof different agroecological conditions.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 6","pages":"1708–1728"},"PeriodicalIF":6.3,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148624720","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}

引用次数: 0

Advancing Electrochemical Technologies for Sustainable Water Treatment and Resource Recovery 电化学技术在可持续水处理和资源回收中的应用

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-26 DOI: 10.1021/acsestengg.6c00489

Brian Chaplin, Patrick Unwin, Kangwoo Cho, Marta Hatzell, Carlos A. Martínez-Huitle, Julie Macpherson, Guido Mul, Gaston A. Crespo, Sergi Garcia-Segura, William A. Tarpeh

引用次数: 0

Revealing the Oxidation Mechanism of Cr(III)–Fe(III) Hydroxides during Thermal Drying of Cr-Containing Sludge: Molecular Pathway and Inhibition Strategy 含铬污泥热干燥过程中Cr(III) -Fe （III）氢氧化物氧化机理的揭示：分子途径与抑制策略

IF 6.3

ACS ES&T engineering Pub Date : 2026-06-12 Epub Date: 2026-05-22 DOI: 10.1021/acsestengg.6c00315

Shuya Wang, Haoran Yu, Wenyi Zhang, Linqiang Mao

{"title":"Revealing the Oxidation Mechanism of Cr(III)–Fe(III) Hydroxides during Thermal Drying of Cr-Containing Sludge: Molecular Pathway and Inhibition Strategy","authors":"Shuya Wang, Haoran Yu, Wenyi Zhang, Linqiang Mao","doi":"10.1021/acsestengg.6c00315","DOIUrl":"10.1021/acsestengg.6c00315","url":null,"abstract":"Thermaldrying (100–300 °C) is usually required toreduce moisture from chromium (Cr)-containing sludge before incineration,storage, or other resource recovery processes. Yet, part of trivalentchromium (Cr(III)) is oxidized to the toxic hexavalent chromium (Cr(VI))during thermal drying. Currently, the molecular-level Cr(III) oxidizationpathways during thermal drying remain poorly understood. In this paper,the molecular reaction pathway and the influence of Fe(III) substitutionon CrxFe1–x(OH)3 oxidation in thermal drying are clearly elucidated.CrO3 is identified as a formed Cr(VI) product, and theoxidation pathway is heavily dependent on temperature and CrxFe1–x(OH)3 hydration. CrxFe1–x(OH)3 is oxidized through a well-definedpathway involving CrO3 as a key metastable intermediate,which sequentially decomposes into Cr5O12 andCrnFe2–nO3 at higher temperatures. The substitution of Fe(III)enhanced CrxFe1–x(OH)3 oxidation and lowered initial oxidation temperature,because Fe3d orbital hybridization with exogenous O2p orbitals facilitated electron transfer between Cr–Osystems, and expanded electron transition regions. Since Cr(OH)O isan essential intermediate product during the Cr(VI) formation process,PO43–, SO42–, and Cl– ions were introduced to preferentiallycombine Cr(III) before the CrxFe1–x(OH)3 dehydration process, thereby preventingthe generation of Cr(OH)O and subsequent Cr(VI) products. This studyprovides fundamental insights into the molecular-level mechanism ofCr(III) oxidation during thermal drying of Cr-containing sludge.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"6 6","pages":"1919–1927"},"PeriodicalIF":6.3,"publicationDate":"2026-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148656449","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}

引用次数: 0