ACS ES&T engineering最新文献

{"title":"Acid-Resistant Algae Accelerate Biomineralization Driven by Iron-Oxidizing Bacteria in Acid Mine Water through Serving as Electron Shuttles, Iron Ligands, and Seed Crystals","authors":"Long Su,&nbsp;Lanlan Liu,&nbsp;Jingsai Li,&nbsp;Xiang Chen,&nbsp;Di Fang* and Lixiang Zhou,&nbsp;","doi":"10.1021/acsestengg.4c0070610.1021/acsestengg.4c00706","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00706https://doi.org/10.1021/acsestengg.4c00706","url":null,"abstract":"<p >Iron biomineralization driven by chemoautotrophic iron-oxidizing bacteria (e.g., <i>Acidithiobacillus ferrooxidans</i>) facilitates acid mine water remediation but faces considerable technical challenges such as slow Fe(II) oxidation and Fe(III) precipitation. To address these challenges, we used the widely present acid-resistant algae (e.g., <i>Parachlorella kessleri</i>) as a green booster for Fe biomineralization. The assistance of <i>P</i>. <i>kessleri</i> in biomineralization with <i>A. ferrooxidans</i> improved the production of ferric hydroxysulfate minerals (66.2% schwertmannite and 33.8% goethite) in mine water (pH 2.7) with 1.6 and 1.4 times faster rates of Fe(II) oxidation and total soluble Fe precipitation. Mechanistically, algae-secreted extracellular organic matter (EOM), especially CHONS-containing high-molecular-weight (400–650 Da) compounds with low double-bond equivalent (DBE ≤ 10, O/C &lt; 0.2) and high carbon atom (C ≥ 15) (e.g., proteins), acted as electron shuttles with electron accepting and electron donating capacities of 0.9 and 0.7 mmol e^–/g C, respectively, that accelerate electron transfer between Fe(II) and <i>A. ferrooxidan</i> to generate more reactive oxygen species (H₂O₂ and ·OH) for Fe(II) oxidation. Algal EOM could also bond readily with Fe(II) at low pH to form EOM-bound Fe(II). Compared with free Fe(II), EOM-bound Fe(II) was more easily oxidized in the acidic mine water due to its relatively lower Gibbs free energy, higher current intensity, and smaller charge transfer resistance. In Fe(III) precipitation, single spherical algal cells could serve as seed crystals that initiate the heterogeneous nucleation of ferric hydroxysulfate minerals and accelerate their crystallization in mine water by reducing the supersaturation demand. These findings provide new insights into the highly efficient bioremediation of metal-rich acid mine waters with algal-bacterial synergy.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"805–815 805–815"},"PeriodicalIF":7.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608984","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":"Microbial Iron Utilization Pathways in Constructed Wetlands: Analysis of Substrates Affecting Iron Transformation, Absorption, and Utilization","authors":"Xinyue Zhao,&nbsp;Yibo Shi,&nbsp;Lan Yang and Shih-Hsin Ho*,&nbsp;","doi":"10.1021/acsestengg.4c0044810.1021/acsestengg.4c00448","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00448https://doi.org/10.1021/acsestengg.4c00448","url":null,"abstract":"<p >Iron materials are known to enhance the nitrogen removal efficiency in constructed wetlands (CWs) by coupling iron transformation with nitrogen removal. However, current research lacks detailed explanations of the microbial processes involved in utilizing iron substrates, such as iron transformation, cellular iron uptake, and metabolism, leaving a gap in the understanding of these connections. This study addresses this gap by constructing four microcosm CW systems using Fe–C, various ratios of pyrite, and zerovalent iron (ZVI) as substrates. Experimental results indicated that the iron transformation was the most thermodynamically favorable with pyrite. Microbial communities on pyrite: gravel in a 2:1 volume ratio (2P1G) exhibited a greater propensity for Feammox, with a 0.76% increase in the functional microbial network of Feammox and a 31.20% increase in the abundance of the <i>nirA</i> gene associated with Feammox process compared to the Fe–C group. Conversely, the iron transformation in the Fe–C group was thermodynamically less favorable. To maintain intracellular iron homeostasis, microorganisms in the Fe–C group increased the siderophore activity. The gene abundances related to the release and absorption of siderophore were 22.12% and 17.26% increased, respectively, compared to 2P1G. This research employs the siderophore indicators to elucidate the link between iron transport and nitrogen metabolism, providing insights for improving nitrogen removal in CWs.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"366–376 366–376"},"PeriodicalIF":7.4,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402049","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":"Integrating Biological Phosphorus Removal with High-Rate Activated Sludge for Enhanced Settleability and Nutrient Management at Short Solids Retention Times","authors":"Chengpeng Lee,&nbsp;Hau Truong,&nbsp;Khoa Nam Ngo,&nbsp;Ahmed AlSayed,&nbsp;Emily Karen Kin,&nbsp;Stephanie Fuentes,&nbsp;Xiaojue Chen,&nbsp;Haydée De Clippeleir* and George Wells*,&nbsp;","doi":"10.1021/acsestengg.4c0052410.1021/acsestengg.4c00524","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00524https://doi.org/10.1021/acsestengg.4c00524","url":null,"abstract":"<p >High-rate activated sludge (HRAS) processes operate at reduced hydraulic retention time and solids retention time (SRT) to minimize mineralization and enhance sludge digestibility. Enhanced biological phosphorus removal (EBPR) employs phosphorus accumulating organisms (PAOs) to uptake soluble phosphorus from wastewater, preventing nutrient pollution. However, the slow growth rates of PAOs relative to the aggressive SRTs (&lt;2 days) commonly used in HRAS present a potential conflict. This study aims to determine the feasible minimum aerobic SRT that maintains biological phosphorus (bio-P) removal, quantify phosphorus removal through biomass assimilation and bio-P pathways, and assess the impact of bio-P selection on HRAS sludge settleability. Two parallel bioreactors were operated for 246 days with real wastewater supplemented with acetate and phosphate to ensure a consistent feed source; one system was operated as an HRAS without EBPR and the other as an integrated HRAS and EBPR. Significantly, integrating EBPR with HRAS improved sludge settleability, leading to an enhancement in carbon capture. In continuous operation, bio-P performance deteriorated at aerobic SRT below 1.9 days and was strongly influenced by the influent’s volatile fatty acid to phosphorus ratio. Interestingly, Bio-P activity tests demonstrate the feasibility of integrating EBPR with HRAS at aerobic SRT as low as 1.1 days. These results highlight the cobenefits of EBPR integration, including enhanced phosphorus removal, carbon redirection, and settleability, underscoring the high potential for resource recovery from wastewater streams.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"377–388 377–388"},"PeriodicalIF":7.4,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402048","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":"Revolutionizing Microalgae Harvesting and Cultivation with Living Membranes: A Leap Forward in Optimized Biomass Recovery and Lipid Production","authors":"Giuseppina Oliva,&nbsp;Antonio Buonerba,&nbsp;Aniello Mariniello,&nbsp;Antonis Zorpas,&nbsp;Chi-Wang Li,&nbsp;Vincenzo Belgiorno,&nbsp;Vincenzo Naddeo* and Tiziano Zarra,&nbsp;","doi":"10.1021/acsestengg.4c0056210.1021/acsestengg.4c00562","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00562https://doi.org/10.1021/acsestengg.4c00562","url":null,"abstract":"<p >A newly designed living membrane filtering module (LMFM) has been applied to promote synergistic cultivation phases and harvesting of <i>Chlorella vulgaris</i> microalgae. The LMFM is based on a living biomembrane intercalated between two woven fabrics made of polyester Dacron that allows an unprecedented simple microalgae recovery from the aqueous cultivation media. A systematic comparison of two systems operated in parallel for biological carbon capture and utilization (bCCU) was executed. The performances of the photobioreactor with a submerged LMFM (membrane photobioreactor, MPBR) were compared to those of a conventional photobioreactor for microalgae cultivation (PBR). PBR and MPBR obtained 92 and 94% carbon dioxide removal yields, respectively. The presence of the membrane did not significantly affect the performance in terms of carbon dioxide removal, which resulted in elimination capacity per stage up to 24.3 ± 4.4 g m^–3 h^–1 in the MPBR. The LMFM indeed afforded a remarkable enhancement in microalgal biomass production and composition in lipids, with lipid concentration up to 36% on dry weight. The produced biomass in the MPBR was almost 80% higher than that obtained in the conventional PBR, and the LMFM allowed an increase of 77% in total lipids. Lipid accumulation was mainly attributed to the increased photon availability in the MPBR. Integrating LMFM in the MPBR enhanced biomass recovery and lipid accumulation, increasing the potentiality of algal-based carbon biofixation as an effective biorefinery technology.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 2","pages":"475–486 475–486"},"PeriodicalIF":7.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402403","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":"Activated Persulfate Oxidation as Pretreatment for Quantification of Microplastics in Natural Water","authors":"Yunjeong Lee,&nbsp;Jeehyun Chung,&nbsp;Jiyoon Cho,&nbsp;Jiyun Han,&nbsp;Alim Jang,&nbsp;Hye-Jin Lee,&nbsp;Seok Won Hong* and Changha Lee*,&nbsp;","doi":"10.1021/acsestengg.4c0082110.1021/acsestengg.4c00821","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00821https://doi.org/10.1021/acsestengg.4c00821","url":null,"abstract":"<p >The detrimental impact of microplastics (MPs) in natural water on human health and the environment has directed considerable attention toward the development of the corresponding quantification methods. However, the accurate quantification of MPs in natural water requires a meticulous sample pretreatment to distinguish them from other particulates. To address this need, we developed a rapid and simple pretreatment procedure based on heat- and base-activated persulfate oxidation, coupled with fluorescence microscopy. The pretreatment conditions were optimized by adjusting the reaction temperature and base concentration. The brief (15 min) persulfate treatment effectively degraded nonplastic microparticles (non-MPs) but minimally affected the physicochemical properties of polyethylene (PE)-MPs. Consequently, pretreating a mixture of PE-MPs and non-MPs in deionized (DI) water and various natural waters enabled the selective quantification of PE-MPs. Furthermore, the physicochemical properties of polypropylene (PP), polyvinyl chloride (PVC), poly(methyl methacrylate) (PMMA)-MPs, and UV-aged PE-MPs underwent negligible changes during the persulfate treatment, thereby indicating the feasibility of using the method across various types of MPs. In addition, the properties of MPs in natural water were simulated by considering the formation of biofilms and the adsorption of impurities, both of which can interfere with MP analysis. The activated persulfate oxidation separated bioaggregated MPs into individual particles by degrading the biofilms and removed adsorbed impurities, such as natural organic matter and clay minerals, from the surfaces of MPs.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 5","pages":"1131–1139 1131–1139"},"PeriodicalIF":7.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921351","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":"Catalytic Oxidation of Low-Concentration Methylmercaptan by Persulfate Activation with Nanoconfined Ni@NCNTs","authors":"Kehan Li,&nbsp;Wenji Feng,&nbsp;Ao Zhong,&nbsp;Haiqiang Wang* and Zhongbiao Wu,&nbsp;","doi":"10.1021/acsestengg.4c0091010.1021/acsestengg.4c00910","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00910https://doi.org/10.1021/acsestengg.4c00910","url":null,"abstract":"<p >Methylmercaptan (CH₃SH) has a low olfactory threshold with significant toxicity and corrosiveness. The nickel-nanoparticle-confined nitrogen-doped carbon nanotube (Ni@NCNT) is a potential candidate for advanced oxidation process (AOP) catalysts, because the good electrical conductivity of Ni can combine the advantages of Ni and NCNT. In this study, the large surface area, multistage pore structure, high nitrogen content, and uniformly dispersed nickel nanoparticles confined in the nitrogen-doped carbon nanotube of Ni@NCNT were conducive to increasing the electron transfer capacity, improving mass transfer, and enriching active sites. Ni@NCNTs were used for the efficient activation of peroxydisulfate (PDS) and mineralization of the gas-phase low-concentration CH₃SH. In a continuous-flow system with a PDS concentration of 0.5 g L^–1 and Ni@NCNT-800-g concentration of 0.15 g L^–1, 92% of CH₃SH was stably degraded within 180 min; almost no byproduct such as dimethyl disulfide was produced, and most sulfur species were completely oxidized to SO₄^2–. This process has a wide pH range, low Ni leaching rates, and good reusability. The mechanism study showed that Ni(0), Ni(II), pyridine N, graphite N, and C═O as active sites promoted the generation of the active species. The activation pathway of the PDS catalyst includes both free-radical and non-free-radical processes. The generation of a single oxygen atom and the excellent electron transfer performance of Ni@NCNT played important roles in the nonradical process. This study develops an effective strategy for the deep degradation of gas-phase low-concentration sulfur-containing volatile organic compounds and provides a pathway for the synthesis of highly efficient metal-nitrogen-carbon catalysts for other environmental applications.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 6","pages":"1385–1395 1385–1395"},"PeriodicalIF":7.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144269575","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":"Synthesized Ettringite for Sequestration of Inorganic 14C from the Waste Solution","authors":"Bhupendra Kumar Singh,&nbsp;Nurul Syiffa Mahzan and Wooyong Um*,&nbsp;","doi":"10.1021/acsestengg.4c0068210.1021/acsestengg.4c00682","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00682https://doi.org/10.1021/acsestengg.4c00682","url":null,"abstract":"<p >Carbon-14 (¹⁴C), a radionuclide generated in a nuclear power plant’s operation, is a serious environmental threat due to its long half-life (5730 years) and potential mobility in the environment. Herein, we present the sequestration behavior of inorganic ¹⁴C as carbonate (CO₃^2–) and bicarbonate (HCO₃^–) species from a simulated waste solution using synthesized ettringite under various experimental conditions. The ettringite was synthesized via the solution route and characterized by XRD, FT-IR, N₂ adsorption/desorption isotherms, and FE-SEM/EDS analyses. Synthesized ettringite exhibited an efficient inorganic ¹⁴C removal capacity (∼92–94%) as compared to CO₃^2– and HCO₃^– anions from the waste solution. The mechanism for the sequestration of CO₃^2– and HCO₃^– anions from the waste solution using ettringite suggested that the removal of CO₃^2– and HCO₃^– anions was achieved via ligand exchange and framework dissolution–precipitation, respectively. To investigate the ¹⁴C retention capacity onto ettringite, the study also performed desorption experiments in simulated groundwater (SGW) and the obtained results suggested that the desorption % of both anions was significantly lowered (7 and 4.5% for HCO₃^– and CO₃^2– anions, respectively) in SGW. We believe that our results will be highly significant in interpreting the immobilization behavior of dissolved inorganic ¹⁴C as bicarbonate and carbonate anions present in alkaline waste solutions/aqueous environments.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"792–804 792–804"},"PeriodicalIF":7.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608982","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":"Flash Joule Heating Upgraded Li Leaching of Residues from Spent LiFePO4 Cathodes for Superior Catalytic Degradation of Pollutants","authors":"Hua Shang,&nbsp;Wenting Yang,&nbsp;Zhelin He,&nbsp;Jiewen Luo,&nbsp;Fengbo Yu,&nbsp;Chao Jia and Xiangdong Zhu*,&nbsp;","doi":"10.1021/acsestengg.4c0064510.1021/acsestengg.4c00645","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00645https://doi.org/10.1021/acsestengg.4c00645","url":null,"abstract":"<p >The rapid development of new energy sources has produced large quantities of battery-derived spent LiFePO₄ cathodes (SLICs), whose recycling has attracted growing attention in recent years. Previous SLICs recycling approaches have focused on the recovery of Li resources, neglecting the Fe-enriched residues obtained after Li recovery. Generally, Fe-enriched residues cannot be effectively converted to active Fe species using traditional methods, thereby limiting their upgrading. This study uses the emerging flash Joule heating (FJH) technology to upgrade Fe-enriched residues, and its performance was independent of Li leaching pathways. Common Li leaching protocols were initially applied to extract Li and produce residues enriched with FeC₂O₄, FeO(OH), FePO₄, and Fe₃O₄. Subsequently, ultrahigh temperature and electrical stripping were performed by FJH treatment, promoting Fe–O bond breakage within the various Fe phases and generating low-coordinated Fe⁰ nanoparticles, as confirmed by extended X-ray absorption fine structure analysis. The unique low-coordinated Fe⁰ nanoparticles present in the FJH-derived composites promoted the enhanced catalytic degradation of chloramphenicol following peroxydisulfate activation, in relation to that achieved through traditional pyrolysis-derived composites. Furthermore, the developed continuous FJH process demonstrated the potential for the large-scale recycling of Fe-enriched residues and promoted the conversion of Fe-enriched residues after Li recovery.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 3","pages":"724–731 724–731"},"PeriodicalIF":7.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143608981","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":"A Modified Donnan Dialysis Process Using Sacrificial Magnesium Plates to Improve Phosphorus Recovery and Capture Ammonium and Potassium for Use as a Liquid Fertilizer","authors":"Amir Akbari,&nbsp;Lauren F. Greenlee and Bruce E. Logan*,&nbsp;","doi":"10.1021/acsestengg.4c0072410.1021/acsestengg.4c00724","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00724https://doi.org/10.1021/acsestengg.4c00724","url":null,"abstract":"<p >Donnan dialysis (DD) processes can be used to leverage the electrochemical potential gradient across ion exchange membranes to recover targeted nutrients from liquid waste streams. However, the slow separation rate of diffusion-based systems limits their practical applications. To accelerate phosphorus recovery rates, we used a modified Donnan dialysis (MDD) system that incorporated a sacrificial magnesium (Mg(s)) plate in the feed chamber. Using a second adjoining chamber, we simultaneously recovered ammonium (NH₄⁺) and potassium (K⁺) transported across the cation exchange membrane (CEM), producing a solution that could be used as a liquid fertilizer. Comparisons between MDD and DD across 1×, 5×, and 10× feed concentrations demonstrated that the MDD system captured P efficiently, achieving removal efficiencies of up to 99.6% within 60 min, primarily as struvite (plate surface area to reactor volume ratio of 8.9 m²/m³). Despite a slight reduction in K⁺ and NH₄⁺ diffusion through the CEM due to struvite reactions in the feed, the simultaneous capture of K⁺ and NH₄⁺ in the solid and liquid phases improved their overall recovery by up to 33.6%. These results show the feasibility of the MDD process, which offers both solid and liquid fertilizers from a single operation with improved P recovery rates.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 4","pages":"922–931 922–931"},"PeriodicalIF":7.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814457","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":"Photothermal Approach on Chemical Looping Method for Reverse Water Gas Shift Reaction Using Defective Molybdenum Oxide","authors":"Daichi Takami,&nbsp;Taku Kishimura,&nbsp;Yasutaka Kuwahara* and Hiromi Yamashita*,&nbsp;","doi":"10.1021/acsestengg.4c0070710.1021/acsestengg.4c00707","DOIUrl":"https://doi.org/10.1021/acsestengg.4c00707https://doi.org/10.1021/acsestengg.4c00707","url":null,"abstract":"<p >CO₂ conversion technologies utilizing solar light have garnered significant attention for establishing sustainable societies. Despite the extensive investigation of photothermal approaches, the effect of direct light irradiation on oxygen carriers on the reverse water gas shift chemical looping (RWGS-CL) reaction has not yet been explored. In this study, we investigated the effects of light irradiation on the activity of Pt-loaded metal oxides in the RWGS-CL reaction at 473 K. The Pt/MoO_3–<i>x</i> material exhibited remarkable activity for the photo-assisted RWGS-CL reaction, which was attributed to its high concentration of oxygen vacancies and photothermal property. Moreover, it is notable that the light-induced heating was more effective than uniform heating in the exothermic H₂-reduction step due to the preferable temperature gradient in the material. This study opens up new potentials for the photothermal-assisted CL method, including the separation of the endothermic and exothermic processes of reactions and the strategic use of light-induced temperature gradients.</p>","PeriodicalId":7008,"journal":{"name":"ACS ES&T engineering","volume":"5 4","pages":"864–873 864–873"},"PeriodicalIF":7.4,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814456","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}