Article
Engineering, Environmental
Liquan Chu, Chaojie Zhang, Jing Yu, Xu Sun, Xuefei Zhou, Yalie Zhang
Summary: In this study, Mg/Fe(Al)-calcined layered double hydroxides (Mg/Fe(Al)-CLDHs) with different Mg/Fe(Al) ratios were synthesized to remove nitrate from interflow in the purple soil region of Sichuan Province, China. The 3:1 Mg/Fe CLDH exhibited the best adsorption performance, with a maximum adsorption capacity of 73.36 mg/g. The adsorption process was found to be a physical-chemical multilayer process, with the pseudo-second-order model and Freundlich model being the best-fitting kinetic and isothermal models, respectively.
WATER SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Guangze Nie, Lirui Wu, Shijun Qiu, Zhengwen Xu, Hailing Wang
Summary: Efficient removal of phosphate is crucial for addressing eutrophication. A millimeter-sized nanocomposite, MgAl-201, was developed by impregnating Mg/Al LDH nanosheets into a polystyrene anion exchanger. MgAl-201 exhibited excellent adsorption performance and chemical stability in a wide pH range. It showed great potential for phosphate removal from neutral contaminated waters and achieved a treatable volume 8 times that of traditional anion exchangers.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Mingtao Zhang, Feng Wang, Yifei Long, Linwen Yu, Changhui Yang, Mengyuan Wen, Xiaolan Yu, Yi Tian, Min Zhao
Summary: This study used calcined Mg/Al layered double hydroxide (CLDH) to improve the carbonation resistance of alkali-activated slag (AAS) mortars. The results showed that CLDH reconstructed the structure of AAS mortars, formed a buffer system to absorb CO2, and increased the density of the mortars.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Somia Djelloul Bencherif, Juan Jesus Gallardo, Ivan Carrillo-Berdugo, Abdellah Bahmani, Javier Navas
Summary: A layered double hydroxide material based on Zn and Cr was developed and transformed into the corresponding oxide by heat treatment, showing good photocatalytic activity in photodegradation tests. The catalyst demonstrated 100% degradation in optimized conditions and maintained good performance after five photodegradation cycles.
Article
Chemistry, Inorganic & Nuclear
Mounira Elhachemi, Zoubida Chemat-Djenni, Derradji Chebli, Abdallah Bouguettoucha, Abdeltif Amrane
Summary: This research focuses on the study of a new material, layered double hydroxide (LDH), and its ability to retain nitrate anions. The LDH was synthesized using a co-precipitation method and characterized using various techniques. Adsorption experiments were conducted to test the factors influencing nitrate retention. The results showed that the LDH had a high adsorption capacity for nitrate. Additionally, a statistical physics model was used to explain the nitrate adsorption mechanism.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Xueying Wang, Linjun Wu, Yanchun Huang, Jun Li, Guochun Hua, Chao Liu, Naiwen Li, Bo Lai
Summary: In this study, Mg/Fe/La LDOs (MFL) with high adsorption capacity and selectivity for phosphate removal and recovery were successfully synthesized, providing a potential solution for phosphorus removal and recycling.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Lei Yang, Jianghao Chen, Yanhe Nie, Changliang Shi, Qiang Wang
Summary: In this study, LDHs were used to produce CLDH which demonstrated efficient adsorption of gold (I) complexes from thiosulfate solution. The adsorption process was fast and endothermic, with adsorption equilibrium reached in 2 hours. The CLDH-Au loaded with Au(S2O3)(2)(3-) could be recycled, showing promising application prospects in gold hydrometallurgy.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Ibrahim M. M. Kenawy, Medhat A. H. Hafez, Abdalla A. Mousa, Zainab Abd Elbary, Khaled S. Abou-El-Sherbini
Summary: The study investigated the adsorption process of the industrial dye IDB onto LDHs and CLDHs, finding optimal conditions and suggesting pseudo-second order kinetics and Langmuir-type adsorption isotherm as suitable models. CLDH22 exhibited the best adsorption capacity for IDB removal, with promising results in simulated dyeing processes.
SUSTAINABLE ENVIRONMENT RESEARCH
(2021)
Article
Chemistry, Applied
Xu Chen, Shujuan Li, Wei Chen, Yingquan Chen, Hanping Chen, Haiping Yang
Summary: In the pyrolysis of cotton stalks, lower calcination temperature (650 degrees C) can produce CaO with smaller crystal size and stronger basicity, leading to effective CO2 fixation and high-quality pyrolysis gas. However, increasing calcination temperature results in higher acid content and lower hydrocarbon content, causing a decrease in bio-oil quality.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ziying Chen, Zhujian Huang, Junhong Liu, Enya Wu, Qian Zheng, Lihua Cui
Summary: Nanoplastics, an emerging pollutant, have attracted global attention. The use of Mg/Al-layered double hydroxides (LDH) for flocculation shows potential for removing PSNP. The study reveals that LDH can capture PSNP under different pH conditions, with removal efficiencies over 90.0%.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ruixue Yangcheng, Jiansu Ran, Zhaohui Liu, Yuntong Cui, Jianjian Wang
Summary: Efficient production of high value-added chemicals and biofuels via low-temperature chemoselective HDO of lignin derivatives in water is achieved by using a low-cost, active, and stable Pd/PCE catalyst. The superior catalytic performance is attributed to the presence of P species on the catalyst surface, which accelerates the selective conversion of intermediates into final products.
Article
Chemistry, Physical
Danya Carla Maree, Mike Heydenrych
Summary: Through the use of LDHs supported by mesoporous silica synthesized at different pH values, this study successfully reduced the concentration of oxygen-rich compounds in E. grandis fast pyrolysis oils, while also increasing the higher heating values.
Article
Energy & Fuels
Jiawei Zhong, Bing Han, Zhige Zhang, Guican Bi, Jun Xie
Summary: Ru/Mgx(Al)O nano-catalysts derived from Ru/MgAl layered double hydroxide showed excellent catalytic activity and stability in the bi-reforming of model biogas. The performance was attributed to the CO2 activation and active O* species generation facilitated by the Mgx(Al)O mixed oxides, as well as the inhibited coke deposition by highly-dispersed Ru ultrafine NPs.
Article
Chemistry, Applied
Shanshan Miao, Zhentao Luo, Shujuan Tan, Tong Xu, Zhuoting Zhou, Guangyuan Feng, Guoyue Xu, Guangbin Ji
Summary: This study develops stealth coatings with Mg-Al layered double hydroxide films, which achieve the same color and spectrum as green vegetation and demonstrate excellent weather resistance. It provides new insights into the application of hyperspectral materials in biomimetic camouflage.
PROGRESS IN ORGANIC COATINGS
(2024)
Article
Environmental Sciences
Yanwei Guo, Hongtao Lu, Bangjun Han, Tiemei Zou, Zhiliang Zhu
Summary: A series of novel layered double hydroxides (Mg-Fe-Ti-LDHs) containing Mg2+, Fe3+ and Ti4+ were prepared and their adsorption performance on vanadate in aqueous solution was investigated. The results showed that the introduction of Ti4+ into the LDHs materials increased the vanadate adsorption efficiency. The adsorption capacity was also influenced by the anion intercalated layers, with Cl- intercalation showing higher removal compared to CO32-. The pH of the solution and coexisting ions also had significant effects on vanadate adsorption.
Article
Green & Sustainable Science & Technology
Fanzhi Qin, Chen Zhang, Guangming Zeng, Danlian Huang, Xiaofei Tan, Abing Duan
Summary: Lignocellulosic biomass pyrolysis and gasification technologies have been widely explored for the production of bio-oil, syngas, and process heat. The byproduct of this process, biochar, has attracted attention for its potential value in carbon utilization and carbon neutralization. However, there is a lack of systematic studies on the chemical composition and structure changes during the carbonization process of lignocellulosic biomass, as well as the origin of biochar reactivity. This article provides insights into the decomposition/transformation mechanisms of lignocellulosic biomass and the reactivity-related compositions of biochar. The discussion also expands on the origin of biochar's reactivity and potential ways to express its reactivity. The outlook section highlights future directions and prospects for further research and green applications.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Computer Science, Artificial Intelligence
Xiuling Zhang, Shuo Wang, Ziyun Wu, Xiaofei Tan
Summary: This paper proposes an unsupervised image clustering algorithm based on contrastive learning and K-nearest neighbors (CLKNN). CLKNN is trained in two steps: representation learning and clustering. Experimental results show that CLKNN outperforms other advanced algorithms.
INTERNATIONAL JOURNAL OF MACHINE LEARNING AND CYBERNETICS
(2022)
Review
Environmental Sciences
Lei Yang, Yuanyuan Deng, Zihan Shu, Qiang Chen, Hailan Yang, Xiaofei Tan
Summary: Plant invasion caused by human activities is a serious problem that affects ecosystem diversity and has economic implications. Recent studies have focused on the use of biochar in environmental protection. Using invasive plants as feedstock to produce biochar can achieve ecological and resource benefits, solving issues caused by invasive plants and bringing economic benefits.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Review
Engineering, Environmental
Binbin Shao, Leyuan Shen, Zhifeng Liu, Lin Tang, Xiaofei Tan, Dongbo Wang, Weimin Zeng, Ting Wu, Yuan Pan, Xiansheng Zhang, Lin Ge, Miao He
Summary: This review discusses the formation of disinfection byproducts (DBPs) from emerging organic micropollutants (EOMPs) during chlorine-based disinfection processes (Cl-DPs). The typical Cl-DPs and their mechanisms are introduced, and the formation pathways, mechanisms, and influencing factors of DBPs in the presence of different EOMPs are discussed. The review also summarizes and discusses the detection and control methods of DBPs, and proposes future research directions and challenges in controlling their formation during disinfection processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Ling Xiang, Eydhah Almatrafi, Hailan Yang, Haoyang Ye, Fanzhi Qin, Huan Yi, Yukui Fu, Xiuqin Huo, Wu Xia, Hong Li, Ming Yan, Chengyun Zhou, Guangming Zeng, Xiaofei Tan
Summary: This study revealed that Fe(IV), 1O2, center dot O2, and IO3 center dot were identified as multiple active species in the magnetic ferrite-modified biochar (MFBC)/PI system. The MFBC/PI system exhibited stable degradation efficiency under wide pH ranges and the presence of various interfering anions. The contribution of iron leaching-precipitation equilibrium and redox equilibrium to the degradation efficiency of the PI/MFBC system was verified through a continuous cycle experiment. Moreover, the interaction between biochar and iron provided active site dispersion and fast electron transfer.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Xinjiang Hu, Daixi Zhou, Hui Wang, Wenlong Zhang, Haoxiang Zhong, Yongsheng Chen
Summary: Single atom catalysts (SACs) based on M1-Nx-Cy have emerged as a frontier research field in catalysis, offering high reactivity, maximum atomic utilization, and high selectivity. This review summarizes the fabrication methods of M1-Nx-Cy based SACs via support anchoring and coordination design strategies, characterizes single metal atoms, and discusses their environmental applications. The potential of M1-Nx-Cy based SACs to address current and future environmental pollution problems is emphasized.
CHINESE CHEMICAL LETTERS
(2023)
Article
Computer Science, Artificial Intelligence
Xiuling Zhang, Xiaofei Tan, Zhaoci Luo, Jun Zhao
Summary: In recent years, there has been a new attempt to capture label co-occurrence in multi-label text classification using the sequence-to-sequence (Seq2Seq) model. However, existing approaches often overlook the semantic information in the labels themselves and the Seq2Seq model is influenced by the order of label sequences. Therefore, a novel Seq2Seq model with a different label semantic attention mechanism (S2S-LSAM) is proposed to generate fused information that combines label and text information. This model can effectively select the text features most relevant to the labels.
INTERNATIONAL JOURNAL OF MACHINE LEARNING AND CYBERNETICS
(2023)
Article
Engineering, Environmental
Hong Li, Rongliang Qiu, Yetao Tang, Xiaoguang Duan, Yanling Gu, Hailan Yang, Qiang Chen, Zihan Shu, Ling Xiang, Shaobo Liu, Xiaofei Tan
Summary: Fe(IV) formation and PS activation in biochar/PS systems under a wide range of pH conditions were investigated using Fe-BC250. It was found that Fe-BC250/PS system showed superior performance in contaminant removal under alkaline conditions due to the slow release of Fe2+ and the formation of Fe(IV). This study provides new insights into Fe(IV) formation mechanism and highlights the potential application of low-cost iron-carbon composites in water treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yuanhao Ouyang, Honghui Jiang, Haoxiang Zhong, Guoyu Li, Xiaodong Ji, Qi Jin, Wei Xue, Xinjiang Hu, Mingshan Zhu
Summary: This study developed a g-C3N4 with N2C-type defects/MoO3 Z-scheme photocatalyst (D-CN/MoO3) for the degradation of microcystin (MC-LR) in visible light. The D-CN/MoO3 could photodegrade 100% of MC-LR within 25 min, which was significantly higher than pure g-C3N4. The degradation mechanism was found to be the selective attack of 1O2 on the Adda side chain of MC-LR and subsequent decarboxylation reaction of h+, leading to effective mineralization and reduced toxicity of MC-LR. The D-CN/MoO3 also demonstrated excellent stability and adaptability, showing potential for decontamination of MC-LR in eutrophic water.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Hailan Yang, Rongliang Qiu, Yetao Tang, Shujing Ye, Shaohua Wu, Fanzhi Qin, Ling Xiang, Xiaofei Tan, Guangming Zeng, Ming Yan
Summary: Residual flotation reagents in mineral processing wastewater can pose severe ecological threats when discharged untreated. Metal-free biochar-induced persulfate-advanced oxidation processes (KCBC/PS) efficiently degrade aniline aerofloat (AAF) at low doses of catalyst and oxidant. The dominant reactive oxygen species in the KCBC/PS system is O-2(center dot-), which achieves deep mineralization of AAF. The electron transfer mechanism and active sites play important roles in the KCBC/PS system, allowing for wide pH adaptation and resistance to inorganic anions in real mining wastewater treatment. Carbonyl group is the active site for the non-radical pathway of biochar, while the conversion of SO4 center dot- to superoxide radicals represents a defect. The study also reveals a possible degradation pathway of AAF and its reduced environmental toxicity.
Article
Environmental Sciences
Yifeng Ji, You Peng, Zhitao Li, Jiang Li, Shaobo Liu, Xiaoxi Cai, Yicheng Yin, Tao Feng
Summary: To achieve sustainable urban development, it is crucial to understand the spatial and temporal differentiation characteristics and driving mechanisms of the urban thermal environment (UTE). In this study, the UTE of Shenyang was measured using land surface temperature (LST), and its characteristics were analyzed through standard deviation ellipse (SDE) and hotspot analysis (Getis-Ord Gi*). The relationship between human activities, landscape composition, and configuration and LST was explored using the geographical detector.
Review
Engineering, Environmental
Qianzhen Fang, Hailan Yang, Shujing Ye, Peng Zhang, Mingyang Dai, Xinjiang Hu, Yanling Gu, Xiaofei Tan
Summary: This review comprehensively discusses the generation pathways and identification methods of singlet oxygen (1O2) in catalysts/PMS systems. The generation pathways are summarized based on the inclusion of metal element in catalysts, while the influence of metal valence states and geometric structures on 1O2 generation is thoroughly discussed. Identification methods include EPR, quenching experiments, reaction in D2O solution, and chemical probe tests. Several perspectives for further studies on 1O2 in catalysts/PMS systems are proposed.
Article
Engineering, Environmental
Chenxi Huang, Meifang Li, Ping Wang, Shiyu Song, Beixia Chai, Meijuan Zhang, Xinjiang Hu, Jingju Cai, Shaohua Wu, Qingyun He
Summary: A novel nitrogen-doped magnetic graphene oxide confined Fe-Co dual single-atom catalyst was prepared by one-step molten salt assisted high-temperature pyrolysis. The catalyst showed significant removal efficiency for tetracycline and exhibited good separation and catalytic performance. The effects of key parameters on the degradation of tetracycline were investigated, and the catalytic potential in actual water and regeneration performance of the material were evaluated.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Qizhuo Liu, Xiaodong Ji, Jiaqin Deng, Honghui Jiang, Guoyu Li, Yuanhao Ouyang, Xin Li, Chunfang Tang, Xiaofei Tan, Xinjiang Hu
Summary: In this study, a high photocatalytic activity porous carbon nitride nanosheet was prepared using a simple pyrolysis technique. The nanosheet has a larger specific surface area and higher charge mobility, resulting in enhanced degradation efficiency of microcystin.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Jiaqin Deng, Ying Fang, Changlan Hou, Yanru Zhang, Meifang Li, Jianing Han, Wanxuan Du, Chunfang Tang, Xinjiang Hu
Summary: This study investigates the regeneration of spent biochar adsorbent and the degradation of adsorbed PFOA using ultrasonic assisted activation of persulfate. The results demonstrate that PFOA can be efficiently degraded by the synergistic effect of ultrasound and persulfate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
