Micromachines
·
2023
·Vol. 14
·期 12
·2211
·
IF 3.4
Wenzhen Wang,Chengxiong Gao,Yuxing Chen,Tao Shen,Mingrong Dong,Bo Yao,Yan Zhu
The ternary chalcogenide AgBiS2has attracted widespread attention in the field of photovoltaic and photoelectric devices due to its excellent properties. In this study, AgBiS2powders with an average diameter of 200 nm were prepared via a simple and convenient reflux method from silver acetate, bismuth nitrate pentahydrate, and n-dodecyl mercaptan. The adjustment of the ratios of Ag:Bi:S raw materials and of the reaction temperatures were carried out to investigate the significance of the synthesis conditions toward the composition of the as-synthesized AgBiS2. The results of XRD indicated that the powders synthesized at a ratio of 1.05:1:2.1 and a synthesis temperature of 225 °C have the lowest bismuth content and the highest purity. The synthesized AgBiS2crystallizes in a rock salt type structure with the cubicFm3¯mspace group. Scanning and transmission electron microscopy, thermogravimetric analysis, ultraviolet–visible–near-infrared spectra, and photocatalytic degradation performance were employed to characterize the as-synthesized samples. The results demonstrated that AgBiS2powders display thermal stability; strong absorption in the ultraviolet, visible, and partial infrared regions; and an optical bandgap of 0.98 eV. The obtained AgBiS2powders also have a good degradation effect on the methylene blue solution with a degradation efficiency of 58.61% and a rate constant of 0.0034 min−1, indicating that it is an efficient strategy for sewage degradation to reduce water pollution.Keywords:AgBiS2;reflux method;photocatalytic degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 4
·807-816
·
IF 2.162
Chun-Hui Du,Xin-Yi Zhang,Chun-Jin Wu
Chitosan (CS) with good hydrophilicity and charged property was used to modify graphene oxide (GO), the obtained GO-CS was used as a novel modifier to fabricate thin film composite forward osmosis (FO) membranes. The results revealed that the amino groups on CS reacted with carboxyl groups on GO, and the lamellar structure of the GO nanosheets was peeled off by CS, resulting in the reducing of their thicknesses. The GO-CS improved the hydrophilicity of polyethersulfone (PES) substrate, and their contact angles decreased to 64° with the addition of GO-CS in the substrate. GO-CS also increased the porosity of the substrate and surface roughness of FO membrane, thereby optimizing the water flux and reverse salt flux of FO membrane. The average water flux of the FO membrane reached the optimal flux of 21.34 L/(m 2 h) when GO-CS addition was 0.5 wt%, and further addition of GO-CS to the substrate would decrease the water flux of FO membrane, and the reverse salt flux also decreased to the lowest value of 2.26 g/(m 2 h). However, the salt rejection of the membrane increased from 91.4% to 95.1% when GO-CS addition increased from 0.5 to 1.0 wt% under FO mode using 1 mol/L sodium chloride (NaCl) solution as draw solution (DS). In addition, high osmotic pressure favored water permeation, and at the same concentration of DS, magnesium chloride (MgCl 2 ) exhibited better properties than NaCl. These results all suggested that GO-CS was a good modifier to fabricate FO membrane, and MgCl 2 was a good DS candidate.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 26
·12314-12319
·
IF 3.3
Guofeng Wang,Wenwen Gao,Dong Yun,Chuanzhi Xu,Zhen Li,Chungu Xia
Silica-based mesoporous materials, such as SBA-15, are important supports in the field of catalysis due to their ordered pore channels. The traditional synthesis route of SBA-15 suffers from high autogenous pressure and explosion risks, limiting its industrial production. Herein, a reflux system under ambient pressure was used for the synthesis of SBA-15. Ni nanoparticles were incorporated into the obtained materials to evaluate the quality of the SBA-15 support. The comparative performance of Ni/SBA-15H and Ni/SBA-15R validated there was negligible difference between the SBA-15 prepared by the hydrothermal method (SBA-15H) and the reflux method (SBA-15R). This revolutionary synthesis methodology provides a novel and secure route for the large-scale preparation of SBA-15.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2025
·
IF 4.3
Biao Zhang,Zhanjun Zhu,Qian Song,Xiangying Zeng,Shengjun Yang,Yi Liang,Zhiqiang Yu
With the rapid development of shale gas exploitation, large quantities of drilling cuttings (DCs) and flowback waters (FWs) laden with organics are produced. These organics, whose chemical compositions are largely unknown, could be toxic to organisms in the receiving environment. This study collected two time series of DCs and FWs from different shale gas exploitation platforms in the Sichuan Basin, China. We developed a nontarget analytical method to identify organic additives as well as their degradation products in these DCs and FWs and observed variable compositions and levels of organic additives in the DCs and FWs. The variation could be ascribed to the varied geological shale formations and unique drilling techniques. Alcohol ethoxylates (AEOs) and quaternary ammonium compounds (QACs) were identified as the main additives in the DCs from water-based drilling cutting with AEOs and alkylbenzenesulfonate in the related FWs. Meanwhile, nonylphenol ethoxylates (NPEOs) and QACs were the predominant surfactants in oil-based drilling cutting, with polyethylene glycols (PEGs) and AEOs dominating in related FWs. Carboxylated products of PEGs, polypropylene glycols, NPEOs, and octylphenol ethoxylates were widely identified in DCs and FWs, evincing biotic/abiotic transformation and chain-shortening of these surfactants downhole.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2020
·Vol. 7
·期 2
·184-199
·
IF 3.384
Nan Li,Yu Han,Feiyue Yu,Wei Wang,Qin Liu,Xiaoming Qian,Zhiwei Xu,Hui Deng,Mingjing Shan
Graphical A novel composite forward osmosis (FO) membrane was fabricated by introducing a chitosan (CS) sublayer between nanofibers and polyamide (PA) layer, which was beneficial to forming thin and defect-free PA layer and improved binding strength between substrate and selective layer. A novel composite forward osmosis (FO) membrane was fabricated by introducing a chitosan (CS) sublayer between nanofibers and polyamide (PA) layer, which was beneficial to forming thin and defect-free PA layer and improved binding strength between substrate and the selective layer. Results exhibited low reverse salt flux (0.73 gMH) while maintained high water flux (85.4 LMH), which were better than that in other reports. In order to further improve permeability of membranes, oxidized multiwall carbon nanotubes (OMWNTs) were added into PA layer based on the optimized sublayer. The crosslinking degree of PA layer was reduced, leading to loose PA layers, which promoted the increase of water flux. After modifying, water flux reached 96.9 LMH without sacrificing salt rejection. It was worth mentioning that PAN/CS composite FO membrane, which could adjust microstructure of support layer and selective layer respectively, may provide a promising way for preparing membranes with anticipated separation performance.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2021
·Vol. 15
·期 1
·153
·
IF 3.004
Erdong Yao,Hang Xu,Yuan Li,Xuesong Ren,Hao Bai,Fujian Zhou
Economical and environmental concerns have forced the oil and gas industry to consider reusing flowback and produced water for fracturing operations. The major challenge is that the high-salinity of flowback water usually prevents its compatibility with several fracturing fluid additives. In this paper, the authors explored an economic and effective method to prepare guar fracturing fluids with different salinity waters. The main research idea was to use chelating agents to mask metal ions, such as calcium and magnesium, that are harmful to crosslinking. Firstly, a complexometric titration test was conducted to measure the chelating ability of three chelating agents. Secondly, through viscosity, crosslinking, and hanging tests, it was verified that the complex masking method could cope with the problem of high-valence metal ions affecting crosslinking. Thirdly, the preferred chelating agent was mixed with several other additives, including thickeners, crosslinkers, and pH regulators, to prepare the novel guar fracturing fluid. The comprehensive performances of the novel fluid system were tested such as temperature and shear resistance, friction reduction, gel-breaking performance, and core damage rate. The results show that the organophosphate chelating agent (i.e., CA-5) had the greatest ability to chelate calcium and magnesium ions. There was a good linear relationship between the dosage of CA-5 and the total molar concentration of calcium and magnesium ions in brine water. The main mechanism was that the chelating agent formed a complex with calcium and magnesium ions at a chelation ratio of 1:5. The test results of the comprehensive performance evaluation indicate that the prepared guar fracturing fluid met the requirements for field application, and the lower the salinity of the flowback water, the more it is economical and effective.Keywords:flowback and produced water;chelating agent;complex masking method;crosslinker;chelation ratio
研究领域:
石油工程
·
环境科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jia Zhu,Wei Wei,Chaosheng Zhang,Hongwei Rong,Yongfeng Cao
ABSTRACT Although synthetic polymeric organic compounds have been widely used in sludge-recycling enhanced flocculation (SEF) process as the coagulant aid, effects of their molecular weight (MW) on strengthening ability and floc characteristics variation of SEF, that is, floc recovery ability, floc morphology structure and distribution, remained unclear. In this study, those effects under two colloidal destabilization mechanisms, namely electrostatic patch (EP) and near charge neutrality (NCN), in kaolin colloidal system and humic acid–kaolin colloidal system were investigated using response of SEF and traditional flocculation (TF) to polyacrylamide (PAM) with various MW. Results showed that when PAM with MW of 6 and 12 million Da was chosen, compared with TF, residual turbidity of SEF decreased by 21.45% and 27.72%, respectively, in system I, EP; –7.50% and 13.20%, respectively, in system I, NCN; 12.86% and 9.38%, respectively, in system II, EP and –98.46% and 2.10%, respectively, in system II, NCN. In most cases, the fractal dimension of SEF floc was higher than that of TF floc. And SEF could not reduce frequency of small floc, which is not beneficial to the strengthening ability exertion of SEF. However, when using PAM with MW of 18 and 20 million Da, SEF could significantly reduce the frequency of small floc, and the fractal dimension of SEF floc was lower than that of TF floc. SEF residual turbidity of PAM with 18 and 20 million Da MW decreased by 22.21% and 22.89%, respectively, in system I, EP; 21.61% and 32.19%, respectively, in system I, NCN; 33.99% and 35.29%, respectively, in system II, EP and 18.28% and 28.15%, respectively, in system II, NCN. These findings suggest that PAM with high MW and EP status was more beneficial for SEF to exhibit the strengthening ability to TF than PAM with low MW and NCN status. In addition, the recovery factor of TF floc was larger than 1, while sludge-recycling exerted a flocculation enhancement role. This suggested that the recovery ability of broken flocs had definite indication effect on exertion of SEF strengthening ability.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Chenxu Li,Yue Zhao,Shufeng Shen
Potassium lysinate (LysK) has shown the advantages of reaction kinetics and absorption performance over conventional monoethanolamine (MEA) for CO2 capture. However, very little information is available about its desorption behaviors. In this work, CO2 solubility in aqueous 17.6, 33.5, and 40.8 mass % LysK was measured in an equilibrium reactor at temperatures of (363–393) K and CO2 partial pressures ranging from (2 to 400) kPa. Thermal degradation in the presence of CO2 and relative regeneration energy consumption for this absorbent were evaluated, and also compared with aqueous 30% MEA. An empirical model was proposed to correlate the solubility data and the calculated which are in good agreement with the experimental values with AARDs within 12%. CO2 desorption can be enhanced by overhead reflux of condensate water as a result of solvent vapor effect, which also results in the increasing evaporation heat. The aqueous LysK system was found to be less competitive than the MEA system in overall energy consumption of regeneration (kJ/mol CO2 released). Degradation of CO2-loaded LysK solutions in sealed reactors at 383 and 423 K for 5 and 15 days was qualitatively analyzed by total alkalinity and NMR spectroscopy. Compared with other absorbents, LysK has shown better resistance to thermal degradation in the presence of CO2.
研究领域:
化学工程
·
环境科学
·
能源技术
·
气体分离
·
吸收材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhengkun Hou,Qiuyan Ding,Xueli Geng,Hong Li,Chang Shu,Xin Gao
For reactive distillation (RD) process limited by the separation efficiency of gas–liquid mass transfer, if the physical size of the alternating operation in reaction and separation can be further reduced, it would greatly promote the efficiency of the RD process. For this purpose, a structured HY@SiC catalytic packing was developed in which the gas–liquid mass transfer separation process and the catalytic reaction occurred simultaneously on its surface. The HY@SiC catalytic packing was used in a pilot-scale column for experimental study on production of cyclohexyl acetate (CA) by RD to verify the performance of the catalytic packing for the first time. Furthermore, a RD model based on the HY@SiC catalytic packing was established based on the reaction kinetics of HY zeolite catalyst obtained in this work. Finally, a novel RD process with double recycle stream for CA production was proposed, which will be optimized design with TAC minimize as the optimization objective based on sequential iterative algorithm.
研究领域:
化学工程
·
催化反应工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tingting Zhang,Yan Lv,Pusen Cao,Zhiru Song,Qian Wang,Yong Guo,Lu Hong,Yuxia Chen
Cellulose aerogel evaporators provide a sustainable strategy to balance energy consumption and freshwater production due to their biocompatibility, renewability, high specific surface area, and large porosity. Inspired by the abundant hierarchal, interconnected water transport channels in luffa vine (LV) that favor efficient evaporation, this study designed an aerogel with vertical channels having micropores on their walls. Fibrillated luffa vine cellulose fibers (LVFB) prepared via mechanochemical methods, retained their original pore structures, and then they were combined with sodium alginate (SA). The aerogel with hierarchical pore structure (LSA-D) was fabricated through directional freeze-drying and calcium ion cross-linking. The natural pore structures of LVFB and the vertical channels in the aerogel led to effective reduction in thermal conductivity (0.055 W⋅m −1 ⋅K −1 ) and enhancement in water absorption rate (17.3 g⋅g −1 ). Moreover, fiber micropores facilitated intercommunication of water and salts among different channels to achieve efficient salt reflux. Next, graphene oxide coating and thermal reduction further improved the light absorption and photothermal conversion efficiency. The final aerogel evaporator exhibited an evaporation rate of up to 2.70 kg⋅m −2 ⋅h −1 under 1-sun illumination, and no salt accumulation was observed during continuous evaporation in brine for 36 h. The aerogel demonstrated significant purification capabilities toward wastewater containing organic dye, heavy metal solutions, and acidic solutions in simulated real-world environments. This study not only enhances the efficient utilization and added value of LV, but also provides innovative design ideas for the structural design of solar evaporator materials, offering significant practical application prospects in addressing the global freshwater crisis.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Weining Liu,Xiaoyang Liu,Xi Tan,Mingyang Zhao,Zhao Liu,Ming Yi,Qi Ding,Yaqian Ren,Hairong Li
Triethylamine (TEA) presents considerable threats to public health and production safety because of its toxic and explosive nature, highlighting the urgent need to develop high-performance sensing materials. Traditionally, gas-sensing elements based on p-type metal oxide semiconductor (MOS) have been hindered by their intrinsically low carrier mobility, resulting in performance inferior to n-type MOS. Herein, we successfully constructed Cr 2 O 3 /TiO 2 -X (MCT-X) heterostructures through a in-situ MOF/MXene-derived strategy. The abundant porous nature, along with its increased specific surface area and numerous surface defects, facilitated the interaction between TEA and active centers. Meanwhile, the tightly coupled p-n heterostructures not only enabled rapid carrier migration but also exhibited a rare electron backflow effect. The multidimensional synergistic effects conferred upon MCT-X with excellent sensing properties. The optimal MCT-2 exhibited an outstanding response of 450.01 for TEA (100 ppm, 134 °C), along with superior selectivity, linearity, and stability. Density Functional Theory (DFT) calculations reveal in-depth explanation of the anisotropic charge transport mechanism induced by differences in crystal planes contacts and the sensitization mechanism of the heterostructure. This distinctive synthesis approach, combined with comprehensive mechanistic analysis, offers a strategy for the design of advanced TEA sensing materials.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2018
·
IF 0.668
Xiaoyun Ma,Daqin He,Zhengjian Chen
A simple method for the preparation of nitriles in moderate to good yield has been achieved by treatment of aromatic and heterocyclic aldoximes with malononitrile in water at reflux in the presence of copper acetate as catalyst. Arylaldoximes with an electron-donating group showed the highest reactivity, their conversion being achievable at room temperature.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）