Pan Liu, Li Liu, Yinan Sun, Yiming Zhu, Huichao Duan, Zili Gong, Hongwei Yang, Ping Ning, Zhiyuan Ning
{"title":"Construction of a Fe-Ce-OV coordination environment on in situ exfoliated layered double hydroxide nanosheets and its application in the resource utilization of low-concentration SO2 flue gas","authors":"Pan Liu, Li Liu, Yinan Sun, Yiming Zhu, Huichao Duan, Zili Gong, Hongwei Yang, Ping Ning, Zhiyuan Ning","doi":"10.1016/j.seppur.2025.133038","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133038","url":null,"abstract":"The reduction of SO<sub>2</sub> to elemental sulfur using CO is an effective approach for comprehensively utilizing flue gas generated by the non-ferrous metal smelting industry, while simultaneously enabling the resource recovery of sulfur. Existing research has demonstrated that non-thermal plasma (NTP)-enhanced catalysis is an effective method for utilizing SO<sub>2</sub>, and enhancing the adsorption–desorption process is key to promoting the Eley–Rideal (E-R) and Langmuir–Hinshelwood (L-H) mechanisms. Based on this concept, a MgAl layered double hydroxide (LDH) loaded with bimetallic Fe and Ce active sites was exfoliated using Ar plasma to generate ultrathin FeCe/MgAl-LDH nanosheets. In addition, oxygen vacancies (O<sub>V</sub>) were introduced into the ultrathin MgAl-LDH nanosheets, ultimately constructing a P-FeCe/MgAl catalyst with a Fe-Ce-O<sub>V</sub> coordination environment. The ultrathin FeCe/MgAl-LDH nanosheets facilitated the exposure of abundant basic/active sites, thereby enhancing the adsorption and activation of SO<sub>2</sub> and its reaction intermediates. Moreover, the Fe-Ce-O<sub>V</sub> coordination environment shifted the reaction pathway toward the reduction of carbonyl sulfide (COS), leading to a SO<sub>2</sub> reduction efficiency of 79% under ambient pressure at low temperatures. Overall, the results of this study demonstrate that enhancing the adsorption–desorption process is an effective strategy for reinforcing the E-R and L-H reaction mechanisms, while in situ exfoliation and the construction of coordination environments further promote SO<sub>2</sub> adsorption/conversion and enable directional control over the reaction pathway.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"45 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhefan Wu, Xiaotong Li, Jiao Wang, Yi Shi, Yun Long, Shuhao Ge, Zijian Zhou, Jian Sun
{"title":"Impregnated layer solution combustion synthesis of dark Ca-based thermochemical energy storage composites for direct solar-driven calcium looping","authors":"Zhefan Wu, Xiaotong Li, Jiao Wang, Yi Shi, Yun Long, Shuhao Ge, Zijian Zhou, Jian Sun","doi":"10.1016/j.seppur.2025.133085","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133085","url":null,"abstract":"Ca-based thermochemical energy storage (TCES) materials hold promising prospects for thermal energy storage, considering their energy storage density, temperature compatibility, material safety, and cost. Nevertheless, challenges such as the susceptibility to sintering, and limited light absorption capabilities inherent in Ca-based TCES materials markedly restrict the practical deployment of solar-driven calcium looping (CaL) technology. Hence, this study employs impregnated layer solution combustion synthesis method fabricating Fe/Mn-doped Ca-based materials for thermochemical heat storage. Research indicates that 750 ℃ is the ideal temperature for combustion synthesis. Exceeding this temperature can lead to excessive sintering of Ca-based materials, while falling short results in the in-situ formation of the CaCO<sub>3</sub> phase, both of which can degrade the pore structure of Ca-based TCES composites. The properties of synthesized materials are influenced by the type of impregnated layer template to some extent, with degreasing cotton yielding the Ca-based TCES composites with the most superior thermochemical heat storage properties. In addition, the Fe/Mn-doped Ca-based composite (Ca:Mn:Fe = 100:2:4) demonstrates excellent heat storage property (average energy storage density of 1.32 MJ/kg and an energy density loss of only 4.4 % during 20 cycles), along with favorable light absorption characteristics (solar absorption rate of 63.9 %). This is mainly due to the rich pore structure inherited from the degreasing cotton, and the Fe and Mn elements deepened the surface color of the synthetic material, and acted as an inert skeleton to alleviate the high-temperature sintering of the Ca-based TCES composites to a certain extent.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"8 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of in situ N-doping on the microstructure, oxygen vacancies and CO2 capture performance of CaO-based sorbent","authors":"Bingbing Jin, Mingchun Li, Xiaohan Qu, Hanlin Mu, Kunlong Zhang, Yusheng Wu, Laishi Li, Yan Yu","doi":"10.1016/j.seppur.2025.133080","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133080","url":null,"abstract":"In this paper, a novel N-doped CaO-based sorbent with porous chain-like characteristics and in situ activation of heteroatoms was developed based on natural limestone, which has proven effective in overcoming the major issue of rapid reactivity loss during calcium looping. Under a hydrothermal environment, N-containing calcium precursor was constructed through the electrostatic interaction between the dissociation product of hydrated lime and the polymerization product of urea, causing in situ introduction of nitrogen in CaO and the formation of chain-like structure. A continuously increasing CO<sub>2</sub> capture performance can be observed for the N-doped CaO-based sorbent and the highest CO<sub>2</sub> uptake capacity (0.723 g-CO<sub>2</sub>/g-sorbent) was achieved after 4 cycles. After 15 cycles, the CO<sub>2</sub> uptake capacity can still be maintained at about 0.644 g-CO<sub>2</sub>/g-sorbent. This excellent performance can be attributed to the formation of active doping region and the N-doping induced rich oxygen vacancies. In addition, the construction of porous chain-like structure was also prone to obtain a higher specific surface area and a further improvement in the CO<sub>2</sub> absorption efficiency. More importantly, the N element exposed on pore walls can effectively inhibit the fusion and agglomeration of the grains during circulation, thereby improving the cyclic durability of the sorbent. The proposed in-situ N-doped strategy can provide a novel inspiration for the modification of limestone-based CO<sub>2</sub> sorbent addressed for industrial applications.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"25 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xuetao Liang , Wenjin Zhou , Jingran Li , Bingyang Liu , Longyan Cui , Lingyun Rong , Qi Yang , Zhilin Yang
{"title":"Electro-Fenton degradation of emerging contaminants using Cu-Co bimetallic-modified nickel foam cathodes: The role of metal surface structure and singlet oxygen","authors":"Xuetao Liang , Wenjin Zhou , Jingran Li , Bingyang Liu , Longyan Cui , Lingyun Rong , Qi Yang , Zhilin Yang","doi":"10.1016/j.seppur.2025.133050","DOIUrl":"10.1016/j.seppur.2025.133050","url":null,"abstract":"<div><div>Antibiotic contamination in water presents a substantial threat to both the ecosystem and public health, whereas the electro-Fenton (EF) process is acknowledged as an effective method for removing refractory organics from wastewater. Based on this, we propose a multiphase EF process that utilizes coral-like Cu-Co bimetallic hydroxide (CuCoOOH) and oxide (CuCo<sub>2</sub>O<sub>4</sub>) modified nickel foam (NF) electrodes as cathodic materials, thereby facilitating simultaneous oxygen diffusion and the in-situ generation and activation of H<sub>2</sub>O<sub>2</sub>. It has been demonstrated that the EF process with CuCo<sub>2</sub>O<sub>4</sub>-modified cathodes effectively degraded tetracycline (TC) under low energy consumption conditions ([Na<sub>2</sub>SO<sub>4</sub>]<sub>0</sub> = 10.0 mM, [Current density]<sub>0</sub> = 5.0 mA/cm<sup>2</sup>), achieving a removal efficiency of 96.7 %. However, the removal efficiency of the CuCoOOH-modified cathode EF process for TC (10 mg/L) was only 78.2 %. Furthermore, the CuCo<sub>2</sub>O<sub>4</sub>/NF/EF system demonstrates superior environmental tolerance and electrode repeatability. Electron paramagnetic resonance and quenching experiments demonstrated that ·OH, ·O<sub>2</sub><sup>–</sup>, and <sup>1</sup>O<sub>2</sub> participated in the oxidation process in both EF processes, with <sup>1</sup>O<sub>2</sub> identified as the primary contributor to the oxidation of TC. <em>In-situ</em> Raman spectroscopy and density functional theory reveal the relationship between the Cu-Co bimetallic configuration and the in-situ generation trends and formation free energy of H<sub>2</sub>O<sub>2</sub>. Differences in the degradation intermediates, pathways, and toxicity evolution of TC in two EF processes were identified using LC-MS. It is ultimately emphasized that the CuCo<sub>2</sub>O<sub>4</sub>-modified NF cathode EF process is more cost-effective and detoxifying, while the cathode exhibits dual Fenton-like activity, ensuring sustained and efficient wastewater treatment.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"368 ","pages":"Article 133050"},"PeriodicalIF":8.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Development of an efficient simulated-moving-bed adsorption process for separation of 1,3-propanediol and glycerol coming from cyanobacterial fermentation based on photosynthesis and Calvin cycle","authors":"Hyeongjoo Woo, Hoe-Jong Kang, Sungyong Mun","doi":"10.1016/j.seppur.2025.133043","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133043","url":null,"abstract":"With regard to microbial fermentation for the production of 1,3-propanediol (called “PDO” hereafter), there has been a particular interest in Calvin cycle-based cyanobacterium fermentation method, which has the advantage of not producing by-products other than PDO. To activate the industrial production of PDO based on this method, it is essential to establish a reliable process that can efficiently separate “PDO produced through reduction of glycerol” from “unreduced glycerol”. In response to this issue, this study aimed to investigate the possibility of applying a simulated-moving-bed (SMB) technology to the continuous separation of PDO from glycerol under the concentration ranges of PDO and glycerol formed through the considered fermentation processing. First, for such PDO-glycerol separation, it was found that the adsorbent consisting of only hydrophobic backbone could provide better selectivity than the type of adsorbents previously used (i.e., hydrophobic backbone-based cation exchange resins). Based on the adsorbent selected through this procedure, the intrinsic parameters of PDO and glycerol were determined and then utilized in the optimal design of the PDO-separation SMB process (called “PDO-SMB” hereafter). The results showed that a three-zone open-loop configuration based on the split of extract-port’s upstream zone and separation zones was suitable for the PDO-SMB structure, under which its operating conditions were optimized in the direction of maximizing PDO yield and glycerol removal-rate. Through the operation of such optimized PDO-SMB process, the continuous separation of PDO from glycerol under the target concentration ranges was successfully achieved, which was confirmed both theoretically and experimentally. It was further found that the introduction of a two-substep operation mode and two extract ports into the PDO-SMB could help significantly improve the PDO-SMB productivity without reducing its separation performance.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"64 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuehan Wu , Yanan Wang , Man Zhou , Yuzhe Zhang , Han Li , Qian Liang , Zhongyu Li , Song Xu
{"title":"Highly efficient photocatalytic conversion of CO2 achieved by constructing core–shell Z-scheme Bi2MoO6@COF heterojunction","authors":"Yuehan Wu , Yanan Wang , Man Zhou , Yuzhe Zhang , Han Li , Qian Liang , Zhongyu Li , Song Xu","doi":"10.1016/j.seppur.2025.133081","DOIUrl":"10.1016/j.seppur.2025.133081","url":null,"abstract":"<div><div>The conversion of CO<sub>2</sub> into hydrocarbon fuels through photocatalytic technology contributes to a sustainable carbon cycle. However, the use of noble metals and photosensitizers in previous studies has raised costs while the slow charge transfer rates during the photocatalytic process have diminished CO<sub>2</sub> conversion efficiency. Therefore, this study investigated a core–shell Bi<sub>2</sub>MoO<sub>6</sub>@COF photocatalyst constructed by combining Bi<sub>2</sub>MoO<sub>6</sub> nanoflower balls with the organic covalent framework TpPa-2-COF, which facilitated the photocatalytic reduction of CO<sub>2</sub> under water vapor conditions. Additionally, the Z-scheme heterojunction formed between Bi<sub>2</sub>MoO<sub>6</sub> and TpPa-2-COF promoted interfacial charge transfer, enhancing the separation efficiency of electrons and holes. The optimized Bi<sub>2</sub>MoO<sub>6</sub>@COF photocatalyst exhibited excellent catalytic performance in CO<sub>2</sub> reduction reactions, achieving a CO reduction rate of 12.71 μmol·g<sup>−1</sup>·h<sup>−1</sup> and a CH<sub>4</sub> reduction rate of 5.5 μmol·g<sup>−1</sup>·h<sup>−1</sup>, which were approximately 2.73 times and 1.42 times higher than those of Bi<sub>2</sub>MoO<sub>6</sub>, respectively. Furthermore, the active species capture experiment, electron paramagnetic resonance (EPR) and photoelectrochemical techniques were employed to propose the photocatalytic mechanism of CO<sub>2</sub> reduction for as-prepared Z-scheme Bi<sub>2</sub>MoO<sub>6</sub>@COF heterojunction.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"368 ","pages":"Article 133081"},"PeriodicalIF":8.1,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Seungju Kim, Arash Momeni, Masood S. Alivand, Pravin C. Bolne, Kathryn A. Mumford, Sandra E. Kentish
{"title":"Catalytic carbon dioxide absorption and stripping using nanofibrous membrane contactors","authors":"Seungju Kim, Arash Momeni, Masood S. Alivand, Pravin C. Bolne, Kathryn A. Mumford, Sandra E. Kentish","doi":"10.1016/j.seppur.2025.133079","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133079","url":null,"abstract":"Catalyst-assisted CO<sub>2</sub> capture processes are developed using membrane gas-solvent contactors. While chemical absorption-based capture methods are among the most practical for CO<sub>2</sub> capture, they are generally regarded as energy-intensive, particularly for the regeneration of CO<sub>2</sub>-rich solvents. Herein, we propose catalytic membrane-based CO<sub>2</sub> absorption and desorption processes which significantly lower the solvent regeneration temperature and offer additional CO<sub>2</sub> sorption sites within mesoporous MCM-41 based catalysts. The incorporation of membrane gas-solvent contactors with hydrophobic polymer nanofibres enhances CO<sub>2</sub> transfer by creating a larger mass transfer area. The resulting catalytic CO<sub>2</sub> capture process, incorporating 1.0 wt% of SO<sub>4</sub><sup>2-</sup>/MCM-41 nanocatalysts in 5 M monoethanolamine (MEA) solution and Thermally Rearranged polymer (TR-PBOI) nanofibre membranes, demonstrates 23.5mmol m<sup>−2</sup> s<sup>−1</sup> of CO<sub>2</sub> absorption flux at 50 °C and 32.6mmol m<sup>−2</sup> s<sup>−1</sup> of CO<sub>2</sub> desorption flux at 90 °C, presenting a catalytic enhancement of 150 %.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"36 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Stabilizing single-atom Pt on BiOBr nanosheets by constructing oxygen vacancies with dramatic CO2 photoreduction activity","authors":"Dongdong Zhang, Jiang Zhong, Linjie Tong, Peng Chen, Xingan Jiang, Lin Wang, Xiaoqiang Zhan, Hongli Yang, Hongxian Zhu, Yong Luo, Weiyou Yang","doi":"10.1016/j.seppur.2025.133089","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133089","url":null,"abstract":"Single-atom catalysts (SACs) show great potential in enhancing CO<sub>2</sub> photoreduction activity, thanks to their exceptional atomic efficiency and outstanding catalytic properties. However, the high surface energy of SACs presents a significant challenge, as the single atoms often tend to be aggregated during the synthesis and catalytic processes, thus making them be difficult for efficient and sustainable performance. Herein, we report a strategy to stabilize SACs on photocatalytic materials enabled by creating oxygen vacancy defects on the matrix surface, which allow the single-atom platinum (Pt) uniformly and solidly anchored on BiOBr nanosheets (NSs). The as-synthesized Pt-BiOBr-V<sub>O</sub> achieves a dramatic CO<sub>2</sub> photoreduction activity with a CO production rate of 93.5 μmol·g<sup>−1</sup>·h<sup>−1</sup> and 75 % selectivity, outperforming those of most BiOBr-based photocatalysts ever reported. The overall enhanced catalytic behaviors are mainly attributed to the synergistic effect between the Pt single atoms and V<sub>O</sub>, which optimizes the electronic structure of BiOBr with improved charge transfer and extended lifetime of photogenerated carriers. Moreover, the created oxygen vacancies could act as the electron absorption centers, thus accelerating the activation of CO<sub>2</sub> and the formation of intermediates. The present work provides new insights on rationally designing highly efficient and stable photocatalysts based on defect engineering for developing sustainable green energy.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"90 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jielong Zhou, Bo Wang, Xiandong Hao, Zhiyong Xu, Wenbo Zhao
{"title":"A systematic mathematical model to accurately predict SO2 absorption performance of binary mixture of alkanolamine and ionic liquid","authors":"Jielong Zhou, Bo Wang, Xiandong Hao, Zhiyong Xu, Wenbo Zhao","doi":"10.1016/j.seppur.2025.133087","DOIUrl":"https://doi.org/10.1016/j.seppur.2025.133087","url":null,"abstract":"In the absorption of SO<sub>2</sub>, it is very important for industrial applications to set up mathematical models to describe the changes in physical–chemical properties and the absorption dynamic processes. However, most of the research only pays attention to the molecular structure of absorbent. Few works have investigated the mathematical models in the absorption processes. To make up for the research gap in this area, a binary absorbent composed of 2-(dibutylamino)ethanol (DBEA) and 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([Emim][TfO]) were developed for SO<sub>2</sub> capture in the present work. A systematic mathematical model was proposed to accurately predict the viscosity and density of the absorption system with different absorbent compositions, SO<sub>2</sub> absorption capacities, and temperatures. Additionally, the absorption kinetics and thermodynamics were analyzed across varying absorbent compositions and SO<sub>2</sub>-containing gas flows, enabling dynamic prediction of the absorption process. Furthermore, the correlation between desorption residuals and desorption temperature was investigated, along with an analysis of SO<sub>2</sub>/CO<sub>2</sub> selectivity and the cyclic SO<sub>2</sub> absorption performance. This work provides a robust framework for rational screening and design of alkanolamine-IL hybrid solvents, bridging the gap between experimentally empirical solvent development and theoretical prediction.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"17 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of gold leaching from urban mineral resources via ultrasonic enhancement of thiocyanate-hydrogen peroxide system","authors":"Yan Lu, Jianbo Wang, Zizhen He","doi":"10.1016/j.seppur.2025.133076","DOIUrl":"10.1016/j.seppur.2025.133076","url":null,"abstract":"<div><div>Thiocyanate (SCN<sup>-</sup>) serves as a viable substitute for cyanide in gold extraction, exhibiting toxicity that is 1000 times lower than that of cyanide. This study investigates a rapid ultrasonic-enhanced leaching technique for gold leaching via thiocyanate and hydrogen peroxide system. The leaching behaviors of gold in the thiocyanate solution under various conditions were also evaluated. The results indicated that the redox potential fluctuates between 0.53 to 0.74 V, with a pH value below 4.9, and the SCN<sup>-</sup> concentration varies from 0.08 to 0.38 mol/L, the hydrogen peroxide volume exceeds 0.75 mL, the temperature is maintained at 40 ℃, and solid–liquid ratio of 200/25 tablets /mL. Consequently, 94.65 % of gold was leached and the gold complex present in the system are <span><math><mrow><mi>Au</mi><msup><mrow><mo>(</mo><mi>S</mi><mi>C</mi><mi>N</mi><mo>)</mo></mrow><mrow><mn>2</mn><mo>-</mo></mrow></msup></mrow></math></span> and <span><math><mrow><msup><mrow><mi>Au</mi><mo>(</mo><mi>S</mi><mi>C</mi><mi>N</mi><mo>)</mo></mrow><mrow><mn>4</mn><mo>-</mo></mrow></msup></mrow></math></span>. The results presented in this paper establishes a theoretical foundation for the extraction of gold by the thiocyanate method and promoted the development of thiocyanate technology.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"368 ","pages":"Article 133076"},"PeriodicalIF":8.1,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}