Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xinnian Gou,Peng Shen,Jiang Wu,Xingyue Qi,Fei Qi,Ping He,Hong Yao,Guangqian Luo,Qizhen Liu,Yongfeng Qi
CaSiO 3 exhibits good arsenic capture performance, but it falls short of meeting the actual needs of power plants due to its susceptibility to acidic gases that inhibit its arsenic capture ability. In this study, an Al 2 O 3 /CaSiO 3 adsorbent was prepared by combining the anhydrous grinding and calcining methods. Arsenic vapor capture was conducted in flue gas containing or free of SO 2 and HCl within the temperature range of 800–1000 ℃. The research indicated that the preparation method used in this study resulted in uniform Al 2 O 3 doping that was less prone to agglomeration, thereby creating a good pore structure. The Al 2 O 3 /CaSiO 3 adsorbent exhibited the strongest arsenic capture capacity when the atomic molar ratio of Al/Si was 1:5, with an arsenic capture amount of 871.2 mg/kg, which was significantly higher than the capture capacity of the control group calcium silicate . The doping of Al atoms altered the structure and charge distribution of CaSiO 3 silica-oxygen chains, resulting in the formation of Al active sites with higher adsorption energy, which is more favorable for the adsorption of arsenic. Although the Al 2 O 3 /CaSiO 3 adsorbent reacts with acidic gases to form CaSO 4 and CaCl 2 , which can inhibit arsenic capture, it still maintains a high arsenic capture rate. Al 2 O 3 /CaSiO 3 has excellent arsenic removal, sintering resistance, and acid resistance, making it a promising composite adsorption material for arsenic removal.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 45
·2304718
·
IF 19
Xin-Yu Huang,Keyu Chen,Wenhe Xie,Yanyan Li,Fan Yang,Yu Deng,Jichun Li,Fengluan Jiang,Yan Shu,Limin Wu,Wan-Feng Xie,Yonghui Deng
Acetic acid (CH 3 COOH) detection with high selectivity at low temperatures is significant due to its wide applications in the chemical, medical, and catering industries. Chemiresistive gas sensors based on metal oxide semiconductors (MOSs) are widely used in detecting various gases, but it is necessary to develop MOSs with novel nanostructures to enhance gas-sensing performance. Herein, a series of bismuth subcarbonate (Bi 2 O 2 CO 3 , abbreviated as BCO) microspheres with highly permeable lamellar structure and tunable Sn-doping ratios (0–5 at%) is synthesized by controlling kinetics equilibrium of the hydrothermal reaction. The sensor based on 3 at% Sn-doped BCO microspheres exhibits excellent gas-sensing performances toward acetic acid (10 ppm), including high sensitivity ( S = 8.3), fast recovery speed (10 s), long-term stability (over 30 days), and good selectivity at a low temperature (150 °C). The unique permeable lamellar structure assembled from 2D Sn-doped BCO nanosheets and rich Sn 4+ doping-induced active sites is mainly responsible for the enhanced gas-sensing performances. Moreover, a new acetic acid reaction process is revealed via in situ diffuse reflectance infrared transform spectroscopy. Density functional theory calculations indicate that Sn-doped BCO has a higher acetic acid adsorption energy and a larger charge transfer than pristine BCO.
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FUEL
·
2023
·
IF 7.4
Bo Liao,Jinsheng Sun,Jintang Wang,Xindi Lv,Jianlong Wang,Jianxun Guo,KaiheLv,Ren Wang,Junjie Zheng,Zhangxin Chen
Drilling fluid systems with exceptional performance serve as a foundation for commercial hydrate extraction. However, most hydrate reservoirs are located at relatively deep water depths and have shallow burial depths. As a result, there are high demands on the density of a hydrate drilling fluid system. Thus, the traditional hydrate drilling fluid system no longer meet the drilling needs in deep water shallow hydrate reservoirs. In this paper, a copolymer SYZ-2 was synthesized based on N-Vinyl-ε-caprolactam and N, N-dimethyl acrylamide. The effects of SYZ-2 and its NaCl system on methane hydrate were first tested by a constant rate cooling method, and the inhibition mechanisms of the system on hydrate nucleation and formation were investigated by molecular simulations. Meanwhile, the formulation and properties of a low-density hydrate drilling fluid system (1.06 g/cm 3 ) based on SYZ-2 were also described in detail. The experimental results show that the hydrate formation temperature with the influence of SYZ-2 decreases from 10.6 °C to 2.7 °C, which can even be significantly reduced to −3.1 °C in the presence of 7 % NaCl. The molecular dynamic simulation results show that SYZ-2 inhibits the nucleation of hydrates by decreasing the solubility of methane molecules, primarily by promoting the agglomeration of methane molecules. Additionally, SYZ-2 can also adsorb to the surface of hydrates and prevent the hydrate cage structure from capturing methane molecules. In contrast, NaCl inhibits hydrates formation by restricting the movement of water molecules. These results provide valuable insights into a better understanding of the gas hydrate inhibition mechanisms, the rational development of high-performance hydrate inhibitors for drilling fluids, as well as the construction of drilling fluid systems.
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Chuang Wang,Yiqi Liao,Hou-Yong Yu,Yanjuan Dong,Juming Yao
Fiber-based wearable electronic textiles have broad applications, but non-degradable substrates may contribute to electronic waste. The application of cellulose-based composite fibers as e-textiles is hindered by the lack of fast and effective preparation methods. Here, we fabricated polyaniline (PANI)/cellulose fibers (PC) with a unique skin-core structure through a wet-spinning homogeneous blended system. The conductive network formation was enabled at a mere 1 wt% PANI. Notably, PC15 (15 wt% PANI) shows higher electrical conductivity of 21.50 mS cm −1 . Further, PC15 exhibits excellent ammonia sensing performance with a sensitivity of 2.49 %/ppm and a low limit of detection (LOD) of 0.6 ppm. Cellulose-based composite fibers in this work demonstrate good gas sensing and anti-static properties as potential devices for smart e-textiles.
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PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yunze Zhao,Huifang Xing,Meng Rong,Zheng Li,Xuetuan Wei,Congmei Chen,Huizhou Liu,Liangrong Yang
The lithium extraction from emerging unconventional oil and gas (UOG) field brine by β -diketone synergic system was established and systematically studied for the first time. A synergistic system consisting of dibenzoylmethane (DBM) and trioctylphosphine oxide (TOPO) was screened for lithium extraction through high-precise DFT calculation, and the synergistic effects were revealed by FT-IR analysis. A state-of-the-art Li + -Mg 2+ -Ca 2+ co-extraction and Li + selective stripping (CESS) process was proposed to achieve high lithium recovery efficiency. The effects of saponification, phase ratio, extractant composition and stripping acidity on extraction efficiency were systemically studied using real UOG field brine. After three-stage countercurrent extraction, the lithium extraction efficiency reached 98.1 % with the DBM concentration of 0.25 mol/L, TOPO concentration of 0.25 mol/L, and saponification of 70 %. After selective stripping and scrubbing with gradient HCl concentrations, Li + was further separated from Na + , Mg 2+ and Ca 2+ . The mass ratio of Mg 2+ /Li + was reduced by 49.7 times, Na + /Li + was reduced by 102.4 times. This work bridged the gap in the solvent extraction of lithium resources from UOG field brines and provided ideas for UOG field resource exploit and comprehensive utilization.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Peng Yan,Xiang Li,Deyun Ma,Lijun Li,Yuwen Lan,Zhiyong Li,Xiaoting Lu,Manqi Yang,Fenglan Liang
An ultramicropore MOF , {[Co 6 (5-MIA) 5 (tmbpy)(μ 3 -OH) 2 (ethanol) 2 ]∙(ethanol) 2 } n ( 2 ) (5-H 2 MIA= 5- methoxyl-isophthalic acid; tmbpy = 3,3′-dimethyl-4,4′-bipyridine), was rationally designed and constructed. The gas sorption behavior of 2 for C 2 H 2 , CO 2 , CH 4 , CO, and N 2 was investigate by experiments. The C 2 H 2 and CO 2 uptakes of the activated sample ( 2a ) were up to 64.87 cm 3 g −1 and 63.97 cm 3 g −1 at 273 K (100 kPa), respectively. Specifically, 2a possesses 3.5 Å of aperture and multi-functional sites (open Co 2+ sites and methoxy groups), resulting in the synergistic effect of size sieving and host-guest interactions for selective adsorption of carbon dioxide (or acetylene). The IAST selectivities of C 2 H 2 /CH 4 (1:1) and CO 2 /CH 4 (1:1) on 2a were 26.6 and 12.3 at ambient temperature and 100 kPa, respectively. The easy regeneration, outstanding humid/thermal stability, and good reusability, make it a promising candidate for industrial application of the separation of C 2 H 2 /CH 4 , CO 2 /CH 4 , CO 2 /N 2 and CO 2 /CO.
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Processes
·
2022
·Vol. 10
·期 10
·1904
·
IF 3.352
Panyang Guo,Yongle Ma,Houshun Jiang,Jie Wang,Hualei Xu
In the development of natural gas reservoirs, the water produced in wells will cause a decline in gas well productivity. In this study, a selective frozen gel plugging agent system suitable for water plugging in gas reservoirs under conditions of high temperature and high salinity. The plugging capacity of the gel system was evaluated. The experimental results showed that: (1) the optimal experimental scheme of the frozen gelling system was as follows: 107 °C with 1.0% AM-AMPS +0.6% p-benzenediol +0.6% hexamethylenetetramine +0.2% thiourea. (2) The optimal injection volume of the system for water phase plugging was 0.5 PV, and the system has an excellent plugging effect at a permeability of 356–3118 mD. (3) The system could also effectively improve the degree of heterogeneity, and the smaller the degree of heterogeneity, the better the improvement effect. (4) The gel system had a good effect on different plugging methods, and the gas medium did not affect the plugging performance. This study provides a sufficient theoretical basis for the exploitation of high-temperature and high-salinity water-bearing gas reservoirs through experimental research, which is of great significance for improving production capacity.Keywords:high temperature and high salinity;water-bearing gas reservoir;selective water shutoff agent;permeability;plugging property
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xue Li,Xue Zhao,Jiapei Lv,Xiuxiu Jia,Shuxing Zhou,Yimin Huang,Fengqin Chang,Hucai Zhang,Guangzhi Hu
Electrochemical techniques have shown advantages for the removal of low-concentration nitrate. Here, copper oxide nanosheets were grown on self-supporting nickel foam (NF) to prepare electrodes (CuO/NF), which realized the rapid and highly selective conversion of nitrate pollutants in sewage into nontoxic and harmless N 2 . The CuO/NF afforded 100% NO 3 – removal within 100 min and 99.53% selectivity for N 2 at –50 mA without producing a lot of by-products (NO 2 – , NH 4 + , and N 2 H 4 ). Furthermore, 81.8% of NO 3 – was removed under the given conditions after six experimental repetitions. These results suggest that the catalyst has excellent electrochemical stability. The performance of CuO/NF for the electrocatalytic removal of NO 3 – in simulated wastewater (which contained Cl – and SO 4 2– ) was almost unaffected. Because of the high efficiency, high stability, and low cost of CuO/NF, this catalyst is practical for the removal of nitrate for wastewater purification.
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CARBON
·
2022
·
IF 11.307
Haojie Li,Qiang Zhang,Zhixuan Xie,Bingyu Zhao,Yuxiu Yu,Yaodong Liu
Simultaneously enhancing the gas permeability , selectivity and aging stability of carbon molecular sieve membrane (CMSM) is extremely difficult. Facing such poser, a novel silicon doped CMSM at molecular level was prepared by copolymerizing siloxane with single Si– O –Si unit into the backbone of polyimide (PI). This can effectively avoid prior separated structure or multiple Si– O –Si structures and strongly alter the chains packing and thermostability of PI, finally determine the pore structure and thermodynamic behavior . The simple design adjustment simultaneously exhibits the triple enhanced effects on the gas permeability, selectivity and aging stability. The best molecule doped CMSM exhibits the ultra-high H 2 permeability (12482 Barrer, 87% higher), 26% higher H 2 /CH 4 selectivity, and 32% higher H 2 /N 2 selectivity than pure PI based CMSM. Additionally, such CMSM also has a much better aging stability than pure CMSM and most reported CMSMs . After stabilization, it still maintains a high H 2 permeability (8000 Barrer). And the hyper-aging CMSM also exhibits a good aging resistance showing a H 2 permeability of 5300 Barrer, as well as high selectivity of H 2 /CH 4 (125) and H 2 /N 2 (106) after 35 days. This work opens a new way on designing CMSM with excellent performance through heteroatom doping to need future application.
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高影响因子
FUEL
·
2022
·
IF 8.035
Shengji Wu,Yalun Ma,Wangsheng Yu,Hui Wang,Wei Yang,Lei Che,Zhongxi Han
How to enhance the SO 2 tolerance of transition metal oxide-supported activated carbon is one of the hottest issues in the field of mercury capture from flue gas. Addition of a foreign metal ion to prepare bimetallic adsorbent is a common method of improving the SO 2 tolerance of adsorbent. However, this approach suffers from high cost and a complex preparation process. In this study, CeO 2 - and Co 3 O 4 -supported activated carbon ( m %CeO 2 /AC and m %Co 3 O 4 /AC), with various loading values of active center, were prepared by an incipient wetness impregnation method, and their SO 2 tolerances were compared. The mercury removal performance and SO 2 tolerance of both CeO 2 /AC and Co 3 O 4 /AC could be remarkably improved through increasing the loading amount of the active center. Co 3 O 4 /AC exhibited high affinity with SO 2 , and the chemisorbed oxygen in Co 3 O 4 would be largely consumed, when SO 2 was present in the flue gas, resulting in a significant decrease of mercury removal efficiency. The mercury removal efficiencies of 20%CeO 2 /AC, 40%CeO 2 /AC and 60%CeO 2 /AC were 86.1%, 93.7% and 93.7%, respectively, during removal of mercury from flue gas at 150 °C in the presence of SO 2 . 20%CeO 2 /AC was the optimal adsorbent for mercury capture from flue gas, owing to its excellent mercury removal efficiency, strong SO 2 tolerance and relatively lower cost. The mercury species formed over spent 20%CeO 2 /AC were HgO and HgSO 4 . The HgO was generated through the reaction of mercury and chemisorbed oxygen, while the formation of HgSO 4 was due to the reaction between mercury, SO 2 and chemisorbed oxygen. The regeneration investigation indicated that the activity of spent 20%CeO 2 /AC could be almost fully recovered through a temperature-programmed decomposition and desorption process. The present study showed that the SO 2 tolerance of CeO 2 /AC could be easily improved through regulation of the loading amount of the active center.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 46
·17620-17628
·
IF 4.569
Juan Zhang,Jun Zhao,Bo Jin,Rufang Peng
The Zn–BTC, Co–BTC and Zn–Co–BTC series metal–organic frameworks were successfully prepared by a gas–solid two-phase flow (GSF) method with zinc nitrate, cobalt nitrate, and 1,3,5-benzenetricarboxylic acid (H3BTC) as raw materials. Single-crystal structures were obtained by the solvothermal method, and the structure and thermal stability of the target materials were characterized by FT-IR, XRD, SEM, energy-dispersive X-ray spectroscopy and DTA. The three obtained target substances were applied to catalyze the thermal decomposition of ammonium perchlorate (AP), and the performance was longitudinally compared. Testing and calculation results showed that when 10 wt% of the sample was added, monometallic Zn–BTC and Co–BTC lowered the AP pyrolysis temperature by 64.1 °C and 92.3 °C, respectively, and their activation energies decreased from 215.96 kJ mol−1 to 136.27 kJ mol−1 and 125.29 kJ mol−1, respectively. Bimetallic Zn–Co–BTC lowered the AP pyrolysis peak by 103.1 °C and the activation energy to 115.56 kJ mol−1, indicating that the series of samples exhibited good catalytic performance, and the catalytic effect of the bimetallic sample was significantly better than those of the monometallic samples.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wancen Xie,Guijing Chen,Chen Chen,Zhaoyang Song,Qidong Wu,Lun Tian,Zhongde Dai,Songmiao Liang,Peng Tang,Xiang Zhang,Jun Ma,Baicang Liu
Large-scale nanofiltration (NF) membrane fabrication relies on the use of harmful solvents and dangerous monomers ( e.g. , piperazine and trimesoyl chloride). Herein, we employed greener polydopamine (PDA) and polyethyleneimine (PEI) co-deposition to construct NF selective layer on poly(vinyl chloride) (PVC) substrate prepared by using the green solvent methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (PolarClean). The metal-organic framework (MOF) UIO-66 was also co-deposited to tune the NF selective layer property by exploiting hydrogen bonds , Π-Π interaction, and coordination bonds between oxygen functional groups and zirconium (Zr) of UIO-66 and the PDA-PEI complex, as well as its intrinsic properties of high hydrophilicity and positive charge. It also improved the surface area of NF selective layer, contributing to higher permeability. However, excessive dosage, higher than 0.1 g/L, promoted PDA aggregation, thus reducing its deposition on membrane surfaces and causing defects. When the dosage was 0.05 g/L, the ternary coated NF membrane exhibited the best property with low molecular weight cut-off (MWCO, ∼350 Da), adequate hydrophilicity, high permeance (3.17 ± 0.3 L m −2 h −1 bar −1 ), and high MgCl 2 rejection (>80%). When used for shale gas wastewater (SGW) treatment, the ternary coated membrane showed removal rates of 58.5% for dissolved organic carbon , 71.1% for fluorescent organics, and 6.2% for total dissolved solids, allowing the effluent to meet the standards of SGW internal reuse. This work helps to inspire the next-generation sustainable NF membrane fabrication.
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