Sifat Kalam, Abhishek Dutta, Xuesong Li, Sangsuk Lee, Duong Nguyen, Anthony P. Straub* and Jongho Lee*,
{"title":"Maximizing Biochemical and Energy Recovery from Wastewater Using Vapor-Gap Membranes","authors":"Sifat Kalam, Abhishek Dutta, Xuesong Li, Sangsuk Lee, Duong Nguyen, Anthony P. Straub* and Jongho Lee*, ","doi":"10.1021/acsestengg.4c00144","DOIUrl":"10.1021/acsestengg.4c00144","url":null,"abstract":"<p >Carbon, nutrients, and heat are available in vast quantities in wastewater. However, technologies that can effectively extract chemicals and energy are needed to realize wastewater as a sustainable resource. Recent advances in wetting-resistant porous membranes, termed vapor-gap membranes (VGMs), have demonstrated that they are well-suited to the facile, selective, and cost-effective recovery of volatile resources and energy from wastewater. In this review, we examine the promise and limitations of VGM-based processes with a particular focus on two types of resources from wastewater: dissolved volatile compounds and low-grade heat. We begin by discussing the driving forces and selective mechanisms required for the extraction of different resources through VGMs. Then, the current status and challenges for the recovery of volatile compounds using VGMs are presented. We also analyze the resource potential of thermal energy in wastewater and its recovery using VGMs. Based on the membrane capabilities, process requirements, and resource availability, we assess the feasibility of wastewater valorization using VGMs and identify the research needs to achieve high recovery efficiency, long-term reliability, and scalability.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141373756","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}
ACS ES&T engineeringPub Date : 2024-06-06DOI: 10.1021/acsestengg.4c0015010.1021/acsestengg.4c00150
Anatoly Rinberg*, and , Michael J. Aziz,
{"title":"Bicarbonate-Carbonate Selectivity through Nanofiltration for Direct Air Capture of Carbon Dioxide","authors":"Anatoly Rinberg*, and , Michael J. Aziz, ","doi":"10.1021/acsestengg.4c0015010.1021/acsestengg.4c00150","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00150https://doi.org/10.1021/acsestengg.4c00150","url":null,"abstract":"<p >Direct air capture (DAC) of carbon dioxide is one approach among many proposed that is capable of offsetting hard-to-avoid emissions. In previous work, we developed the alkalinity concentration swing (ACS) method, which is driven through concentrating an alkaline solution that has been loaded with atmospheric CO<sub>2</sub> by desalination technologies, such as reverse osmosis or capacitive deionization. Though the ACS is promising in terms of energy usage and implementation, its absorption rate and water requirements are infeasible for a large-scale DAC process. Here, we propose an improvement on the ACS, the bicarbonate-enriched alkalinity concentration swing (BE-ACS), which selects bicarbonate ions from a stream of aqueous alkaline solution that has absorbed atmospheric CO<sub>2</sub>. The bicarbonate-rich stream is then concentrated, which greatly increases its CO<sub>2</sub> partial pressure, and then CO<sub>2</sub> is extracted from solution. We experimentally investigate the use of pressure-driven nanofiltration (NF) membrane-based separation to select bicarbonate ions over carbonate ions. We screen commercial membranes and select one high-performance membrane for detailed studies, quantifying its bicarbonate-carbonate selectivity factor and bicarbonate-passage factor. Feed pH, the combined concentration of aqueous CO<sub>2</sub>, bicarbonate, and carbonate species (or dissolved inorganic carbon), alkalinity, and permeation flux are systematically varied to study NF separation properties. We find that the selectivity factor, which exceeds 30 times in certain regimes, increases with higher feed pH and higher alkalinity. The performance metrics of the selected NF membrane are input into a theoretical BE-ACS cycle analysis, and the required energy input and cycle capacity output are evaluated. Ideal cycle energy is found to be as low as around 250 kJ/mol, with opportunities identified for further decreases through process engineering and forward osmosis energy recovery.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141959319","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}
ACS ES&T engineeringPub Date : 2024-06-06DOI: 10.1021/acsestengg.4c0017310.1021/acsestengg.4c00173
Nan Wang, He Liang, Meng Zhang, Ruiping Liu*, Lina Li*, Li Zhao, Huijuan Liu and Jiuhui Qu,
{"title":"Synchronous Removal of Fluoride and Iodide on Fe–Mn Binary Oxides Interface: Competitive Adsorption Behaviors and Mechanism","authors":"Nan Wang, He Liang, Meng Zhang, Ruiping Liu*, Lina Li*, Li Zhao, Huijuan Liu and Jiuhui Qu, ","doi":"10.1021/acsestengg.4c0017310.1021/acsestengg.4c00173","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00173https://doi.org/10.1021/acsestengg.4c00173","url":null,"abstract":"<p >The coexistence of high-concentration iodide (I<sup>–</sup>) and fluoride (F<sup>–</sup>) in high-iodine groundwater increases the occurrence of endemic diseases such as iodine-induced disorders and fluorosis, and their simultaneous removal has rarely been investigated. In this study, we developed cost-effective Fe/Mn binary oxides (FMBOs) with different Fe/Mn molar ratios (<i>R</i><sub>Fe:Mn</sub>) and investigated their performance and selective adsorption mechanisms for the synchronous removal of I<sup>–</sup> and F<sup>–</sup>. By optimizing the <i>R</i><sub>Fe:Mn</sub> ratios, an FMBO with <i>R</i><sub>Fe:Mn</sub> = 0.5:1 was developed to achieve synchronous removal of I<sup>–</sup> and F<sup>–</sup> with efficiencies of 67.7 and 80.7%, respectively, when the initial concentrations of I<sup>–</sup> and F<sup>–</sup> were 200 μg/L and 1.5 mg/L, and the FMBO dosage was 1.0 g/L. As the pH increases, the removal efficiency of I<sup>–</sup> and F<sup>–</sup> by FMBO decreases. According to the results of X-ray photoelectron spectroscopy (XPS), high-performance liquid chromatography–inductively coupled plasma mass spectrometry (HPLC-ICP/MS), and X-ray absorption spectroscopy results (XAS), FMBO is mainly composed of Fe(III), Mn(IV), and Mn(III). Mn oxide is mainly responsible for the heterogeneous oxidation of I<sup>–</sup>, whereas Fe oxide dominates in the adsorption of I<sup>–</sup> and F<sup>–</sup>. Based on density functional theory (DFT) calculations, the adsorption of SO<sub>4</sub><sup>2–</sup>, NO<sub>3</sub><sup>–</sup>, and HCO<sub>3</sub><sup>–</sup> was achieved via the formation of Fe–O bonds; moreover, the adsorption of I<sup>–</sup> and F<sup>–</sup> was attributed to the formation of Fe–I/F bonds. This study provides insight into the site-specific mechanism involved in I<sup>–</sup> and F<sup>–</sup> adsorption onto low-cost FMBO in realistic high-iodide groundwaters with complex coexisting anions.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141959320","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":"Identification of Superoxide Contribution through the Quenching Method and Model System","authors":"Limiao Cai, Qian Yao, Xiaodong Du*, Xueqin Tao, Mengyao Zou, Jiangmin Zhou, Zhi Dang and Guining Lu*, ","doi":"10.1021/acsestengg.4c0018710.1021/acsestengg.4c00187","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00187https://doi.org/10.1021/acsestengg.4c00187","url":null,"abstract":"<p >The quenching method is widely utilized to evaluate the contribution of reactive species; however, its validity has recently been questioned. The primary role of superoxide (O<sub>2</sub><sup>•–</sup>) in pollutant degradation remains controversial due to its low reactivity. To ascertain the suitability of the quenching method and the degradation ability of O<sub>2</sub><sup>•–</sup>, a simple and efficient O<sub>2</sub><sup>•–</sup> generation system was built using <i>p</i>-benzoquinone (<i>p</i>-BQ) as the probe with disodium hydrogen phosphate–dimethyl sulfoxide (DHP–DMSO). The results demonstrated that O<sub>2</sub><sup>•–</sup> is accountable for <i>p</i>-BQ transformation in DHP–DMSO, and can also be generated in various alkaline-organic solvent (methanol, ethanol, <i>iso</i>-propanol, <i>tert</i>-butanol, acetonitrile, acetone, chloroform, and tetrahydrofuran) systems, revealing that these reagents do not scavenge O<sub>2</sub><sup>•–</sup>. Superoxide dismutase has limited ability on O<sub>2</sub><sup>•–</sup> quenching in the presence of hydroxyl radicals (<sup>•</sup>OH). Some organic solvents can produce organic radicals when stimulated by <sup>•</sup>OH. This serves as a reminder to exercise caution when employing these quenchers. O<sub>2</sub><sup>•–</sup> exhibited insufficient degradation capability for the majority of the eight organic pollutants tested. The relevance of O<sub>2</sub><sup>•–</sup> in pollutant degradation can be quickly discerned by DHP–DMSO. This study holds significant importance in accurately evaluating the contribution of reactive species.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142228143","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}
ACS ES&T engineeringPub Date : 2024-06-04DOI: 10.1021/acsestengg.4c0010710.1021/acsestengg.4c00107
Olatunbosun Adu, Michael Taylor Bryant, Xingmao Ma* and Virender K. Sharma*,
{"title":"A Machine Learning Approach for Predicting Plant Uptake and Translocation of Per- and Polyfluoroalkyl Substances (PFAS) from Hydroponics","authors":"Olatunbosun Adu, Michael Taylor Bryant, Xingmao Ma* and Virender K. Sharma*, ","doi":"10.1021/acsestengg.4c0010710.1021/acsestengg.4c00107","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00107https://doi.org/10.1021/acsestengg.4c00107","url":null,"abstract":"<p >Plant uptake and accumulation of per- and polyfluoroalkyl substances (PFAS), represented by the root concentration factor (RCF), shoot concentration factor (SCF), and translocation factor (TF), were predicted using machine learning (ML) models from experimental data with 19 PFAS compounds and nine plant species. Unsupervised principal component analysis (PCA) was first used to classify the input data, and then supervised ML models, including multiple linear regression model (MLR), artificial neural network (ANN), random forest (RF), and support vector machine (SVM) algorithms, were applied for predicting the chosen output parameters. RF displayed the highest prediction accuracy among the tested models. Feature importance analysis performed using RF showed that the molecular weight, exposure time, and plant species are the most important parameters for predicting RCF, SCF, and TF in hydroponic systems. RF was further applied to estimate RCF, SCF, and TF of the two most prevalent PFAS compounds, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), and their common alternatives and the results revealed that their common replacing compounds have either comparable or higher accumulation in plant roots and shoots. Our results demonstrated that the ML approach could generate critical insight into PFAS plant uptake and accumulation and shed light on the potential food safety concerns from PFAS and their replacements.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsestengg.4c00107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141955626","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}
Olatunbosun Adu, Michael Taylor Bryant, Xingmao Ma, Virender K. Sharma
{"title":"A Machine Learning Approach for Predicting Plant Uptake and Translocation of Per- and Polyfluoroalkyl Substances (PFAS) from Hydroponics","authors":"Olatunbosun Adu, Michael Taylor Bryant, Xingmao Ma, Virender K. Sharma","doi":"10.1021/acsestengg.4c00107","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00107","url":null,"abstract":"Plant uptake and accumulation of per- and polyfluoroalkyl substances (PFAS), represented by the root concentration factor (RCF), shoot concentration factor (SCF), and translocation factor (TF), were predicted using machine learning (ML) models from experimental data with 19 PFAS compounds and nine plant species. Unsupervised principal component analysis (PCA) was first used to classify the input data, and then supervised ML models, including multiple linear regression model (MLR), artificial neural network (ANN), random forest (RF), and support vector machine (SVM) algorithms, were applied for predicting the chosen output parameters. RF displayed the highest prediction accuracy among the tested models. Feature importance analysis performed using RF showed that the molecular weight, exposure time, and plant species are the most important parameters for predicting RCF, SCF, and TF in hydroponic systems. RF was further applied to estimate RCF, SCF, and TF of the two most prevalent PFAS compounds, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), and their common alternatives and the results revealed that their common replacing compounds have either comparable or higher accumulation in plant roots and shoots. Our results demonstrated that the ML approach could generate critical insight into PFAS plant uptake and accumulation and shed light on the potential food safety concerns from PFAS and their replacements.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256765","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}
ACS ES&T engineeringPub Date : 2024-06-03DOI: 10.1021/acsestengg.4c0016510.1021/acsestengg.4c00165
Min Sun, Sheng-Nan Tang, Zi-Xu Chen, Lin-Feng Zhai*, Yuanhua Xia and Shaobin Wang*,
{"title":"Mn-Doping-Induced Co3O4 Structural Distortion and Facet Change for Enhanced Electro-Activation of O2 toward Pollutants Removal","authors":"Min Sun, Sheng-Nan Tang, Zi-Xu Chen, Lin-Feng Zhai*, Yuanhua Xia and Shaobin Wang*, ","doi":"10.1021/acsestengg.4c0016510.1021/acsestengg.4c00165","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00165https://doi.org/10.1021/acsestengg.4c00165","url":null,"abstract":"<p >Oxygen is a green oxidant for the oxidative removal of environmental pollutants. In this work, we employed Mn-doped Co<sub>3</sub>O<sub>4</sub> for electrocatalytic activation of O<sub>2</sub> and investigated the effects of structure and facet on catalysis. Co<sup>3+</sup> substitution by Mn<sup>3+</sup>/Mn<sup>4+</sup> leads to Co<sub>3</sub>O<sub>4</sub> structural distortion and a shift of preferentially exposed (311) to a more catalytically active (220) plane. Meanwhile, more vacancies are created due to the structural defects and charge imbalance between Co<sup>3+</sup> and Mn<sup>4+</sup>. Experimental and theoretical investigations suggest that Mn-doping facilitates adsorption of O<sub>2</sub> on the deficient (220) plane of Co<sub>3</sub>O<sub>4</sub> by triggering a thermodynamically more stable Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub>-[O<sub>2</sub>]* intermediate. Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub> gives a turnover frequency value 9.5 times higher than that for pure Co<sub>3</sub>O<sub>4</sub>. The electrocatalytic wet air oxidation process with Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub> shows a great energy-saving merit with specific energy consumptions as low as 2.2–5.0 kW h kg-TOC<sup>–1</sup> in mineralizing phenolic compounds. This work opens up new opportunities for advancing air oxidation technology into more competitive processes.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141959178","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}
Yaoqiang Wang, Yu Jin, Gang Xiao, Shaojie Wang, Zishuai Wang, Jan Baeyens, Haijia Su
{"title":"Au–Pd Nanoalloy-Catalyzed Intracellular Reducing Power Regeneration to Boost the Biohydrogen Production in a Biohybrid System","authors":"Yaoqiang Wang, Yu Jin, Gang Xiao, Shaojie Wang, Zishuai Wang, Jan Baeyens, Haijia Su","doi":"10.1021/acsestengg.4c00141","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00141","url":null,"abstract":"Efficient coenzyme regeneration in biohybrids can help overcome the challenge of insufficient reducing power in biohydrogen production, but the performance of biohybrids is often hampered by light-dependent and inefficient photoelectron transmembrane transfer. Here, we present an intracellular hybrid system composed of gold–palladium nanoalloys and <i>Clostridium butyricum</i>, which demonstrates efficient dark-catalyzed coenzyme regeneration, thereby enhancing hydrogen production capabilities. By utilizing triethanolamine (TEOA) as the electron donor, the hybrid system achieved a maximum hydrogen production of 2.14 mol of H<sub>2</sub>·mol<sup>–1</sup> glucose, resulting in a remarkable increase of 47.37%. The Au–Pd nanoalloy regenerated intracellular NADH through chemical catalysis with TEOA as the electron donor, which was confirmed by increased reducing power levels and pronounced peak currents. Consequently, the hybrid system had a higher reducing power level, which enhanced the hydrogen-producing activity of the pyruvate formate-lyase (PFL) and NADH-ferredoxin oxidoreductase (NFOR) pathways. The PFL pathway oxidizes pyruvate, while the NFOR pathway directly oxidizes NADH. Pyruvate, a substrate required for hydrogen production in the PFL pathway, is generated through a combination of glucose phosphate transfer and phosphoenolpyruvate (PEP) dephosphorylation. This study offers theoretical guidance for the development of a dark hybrid system of nanocatalysts and microbes that can effectively produce biohydrogen and be used for other applications.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256761","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}
ACS ES&T engineeringPub Date : 2024-06-03DOI: 10.1021/acsestengg.4c0014110.1021/acsestengg.4c00141
Yaoqiang Wang, Yu Jin, Gang Xiao*, Shaojie Wang, Zishuai Wang, Jan Baeyens and Haijia Su*,
{"title":"Au–Pd Nanoalloy-Catalyzed Intracellular Reducing Power Regeneration to Boost the Biohydrogen Production in a Biohybrid System","authors":"Yaoqiang Wang, Yu Jin, Gang Xiao*, Shaojie Wang, Zishuai Wang, Jan Baeyens and Haijia Su*, ","doi":"10.1021/acsestengg.4c0014110.1021/acsestengg.4c00141","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00141https://doi.org/10.1021/acsestengg.4c00141","url":null,"abstract":"<p >Efficient coenzyme regeneration in biohybrids can help overcome the challenge of insufficient reducing power in biohydrogen production, but the performance of biohybrids is often hampered by light-dependent and inefficient photoelectron transmembrane transfer. Here, we present an intracellular hybrid system composed of gold–palladium nanoalloys and <i>Clostridium butyricum</i>, which demonstrates efficient dark-catalyzed coenzyme regeneration, thereby enhancing hydrogen production capabilities. By utilizing triethanolamine (TEOA) as the electron donor, the hybrid system achieved a maximum hydrogen production of 2.14 mol of H<sub>2</sub>·mol<sup>–1</sup> glucose, resulting in a remarkable increase of 47.37%. The Au–Pd nanoalloy regenerated intracellular NADH through chemical catalysis with TEOA as the electron donor, which was confirmed by increased reducing power levels and pronounced peak currents. Consequently, the hybrid system had a higher reducing power level, which enhanced the hydrogen-producing activity of the pyruvate formate-lyase (PFL) and NADH-ferredoxin oxidoreductase (NFOR) pathways. The PFL pathway oxidizes pyruvate, while the NFOR pathway directly oxidizes NADH. Pyruvate, a substrate required for hydrogen production in the PFL pathway, is generated through a combination of glucose phosphate transfer and phosphoenolpyruvate (PEP) dephosphorylation. This study offers theoretical guidance for the development of a dark hybrid system of nanocatalysts and microbes that can effectively produce biohydrogen and be used for other applications.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.4,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141959257","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}
Min Sun, Sheng-Nan Tang, Zi-Xu Chen, Lin-Feng Zhai, Yuanhua Xia, Shaobin Wang
{"title":"Mn-Doping-Induced Co3O4 Structural Distortion and Facet Change for Enhanced Electro-Activation of O2 toward Pollutants Removal","authors":"Min Sun, Sheng-Nan Tang, Zi-Xu Chen, Lin-Feng Zhai, Yuanhua Xia, Shaobin Wang","doi":"10.1021/acsestengg.4c00165","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00165","url":null,"abstract":"Oxygen is a green oxidant for the oxidative removal of environmental pollutants. In this work, we employed Mn-doped Co<sub>3</sub>O<sub>4</sub> for electrocatalytic activation of O<sub>2</sub> and investigated the effects of structure and facet on catalysis. Co<sup>3+</sup> substitution by Mn<sup>3+</sup>/Mn<sup>4+</sup> leads to Co<sub>3</sub>O<sub>4</sub> structural distortion and a shift of preferentially exposed (311) to a more catalytically active (220) plane. Meanwhile, more vacancies are created due to the structural defects and charge imbalance between Co<sup>3+</sup> and Mn<sup>4+</sup>. Experimental and theoretical investigations suggest that Mn-doping facilitates adsorption of O<sub>2</sub> on the deficient (220) plane of Co<sub>3</sub>O<sub>4</sub> by triggering a thermodynamically more stable Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub>-[O<sub>2</sub>]* intermediate. Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub> gives a turnover frequency value 9.5 times higher than that for pure Co<sub>3</sub>O<sub>4</sub>. The electrocatalytic wet air oxidation process with Mn<sub>0.65</sub>Co<sub>2.35</sub>O<sub>4</sub> shows a great energy-saving merit with specific energy consumptions as low as 2.2–5.0 kW h kg-TOC<sup>–1</sup> in mineralizing phenolic compounds. This work opens up new opportunities for advancing air oxidation technology into more competitive processes.","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":null,"pages":null},"PeriodicalIF":7.1,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141256769","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}