International Journal of Greenhouse Gas Control
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2014
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IF 3.821
Hui Hu,Fang Li,Qi Xia,Xiaodan Li,Li Liao,Maohong Fan
Ionic liquids (ILs) are varieties of green solvents that can capture CO 2 effectively. In this research, five synthesized amino ILs were evaluated for their CO 2 absorption performance. Experimental results showed that more amino groups in ILs led to higher CO 2 absorption capacities. For factors such as temperature, gas flow rate, and water content, water content had the most significant impact on the capacity to absorb CO 2 . A CO 2 absorption capacity of 0.96 mol-CO 2 /mol-IL was achieved with [TETAH] + [BF 4 ] − , with the IL containing 0% water and a gas flow rate of 100 ml/min at 293 K. However, when the water content of [TETAH] + [BF 4 ] − reached 40%, CO 2 absorption capacity increased to as high as 2.04 mol-CO 2 /mol-IL. Also, the CO 2 absorption capacity of [TETAH] + [BF 4 ] − increased rapidly with temperature in the range of 283–333 K, but decreased at temperatures greater than 333 K. According to the absorption–desorption recycling experiment of IL 3#, the regeneration rates of ILs increase with water content from 0% to 40%, while raising temperature does not improve regeneration rates. The FT-IR, 13 CNMR, pH and conductivity characterization results indicate that CO 2 reacted with NH 2 and NH in [TETAH] + [BF 4 ] − and formed carbamate. Simultaneously, CO 2 reacted with H 2 O and released H + , thus enhancing the absorption of CO 2 . This has important implications for various projects.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
Materials Today Nano
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2023
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IF 10.3
Jing Yan,Faguang Ma,Yilin Wu
Molecularly imprinted membranes have superior selective separation capacity, rebinding capacity, and flux due to their microporous substrates and tightly packed molecularly imprinted polymers . In current study, artemisinin (Ars), the most effective antimalarial drug , is used as template molecule. The permeation-selectivity wooden membranes based on Ars-imprinted nanocages designed by metal organic framework@carbon nitride self-assembly process (MDWMs) has been successfully prepared: (i) based on three-dimensional mesoporous basswood membranes, dopamine-based auto-polymerization process was developed on basswood to for harvest the first layer imprinting and secondary reaction platform. (ii) The two-dimensional sheet carbon nitride modified by metal-organic framework is stably loaded on the surface of the polydopamine-modified basswood membrane, providing a rich irregular point array structure for the formation of recognition sites. Based on elaborate designs and optimizations, selectivity , rebinding capabilities, and flux are enhanced on the developed MDWMs ( β Are/Ars = 6.49, β Aru/Ars = 4.22, β DH-Ars/Ars = 7.42), and high regeneration rate (>94% after 10 cycles) indicates that MDWMs have superior selectivity and stability. The MDWMs and preparation strategies developed here will provide a completely new design methodology for subsequent selective separation of Ars.
研究领域:
材料科学
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药物化学
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环境工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jiming Yang,Kai Luo,Xingmei Lu,Wei He,Shuangfei Zhao,Zheng Fang,Yirong Feng,Ning Zhu,Kai Guo
Polyhydroxy compounds such as sugar alcohols /derivatives are high value chemicals with application potential in medicine, materials and other fields. Researches on preparation and selective extraction of polyhydroxy compounds have attracted wide attention in the world. However, the selective extraction of polyhydroxy compounds is still a major challenge. In this paper, hydrophobic ionic liquids (ILs) 1-butyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Bmim][Ntf 2 ]), 1-ethyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Emim][Ntf 2 ]) and 1-allyl-3-methylimidazole bis(trifluoromethanesulfon)imide salt ([Amim][Ntf 2 ])) were used for the dissolution and selective extraction of polyhydroxy compounds. In addition, the interaction between ionic liquids and polyhydroxy compounds was characterized and analyzed by NMR and contact angle analysis. The partition coefficients of polyhydroxy compounds in water and hydrophobic ionic liquids were also investigated. It was shown that among the ILs used, the solubility of polyhydroxy compounds fluctuated strongly (from 0 wt% to 19.50 wt%), and the solubility in [Amim][Ntf 2 ] was the highest. These hydrophobic ionic liquids showed strong selective extraction ability when fractionating mixtures composed of sugar alcohols and their dehydrated derivatives (1:1, w / w). The results showed that the purities of isosorbide and isomannide separated were more than 99.60 wt% and 99.99 wt% respectively. Polyhydroxy compounds dissolved in hydrophobic ionic liquids could be directly extracted by water without chemical modification. The regeneration rate of ionic liquids reached 93.22%−97.04%. The NMR characterization of the regenerated ionic liquid showed that water could fully extract polyhydroxy compounds dissolved in the ionic liquids and the structure of the regenerated ionic liquid did not change. It was promising to construct a green and efficient method for fractionating such polyhydroxy compounds based on hydrophobic ionic liquids, and it is suggested to further strengthen the research in this field.
研究领域:
化学工程
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材料科学
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绿色化学
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2024
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IF 2.8
Jing Ma,Yaxuan Du,Meizhe Liu,Yamei Zhou,Xiejun Wang,Baohe Wang,Jing Zhu,Mingxuan Zhu
As a predictive tool, quantum chemical calculations can be used to design protic ionic liquids (PILs) and predict the result. By adding anionic negative potential sites, two dual-functional PILs diethylenetriamine-barbituric acid [C4H14N3]2[C4H2N2O3] and diethylenetriamine-ethylenolactonium [C4H14N3]2[C3H2N2O2] were designed. The simulation results indicated that multisite absorption of anions and cations resulted in an expected absorption ratio exceeding 3:1 (mol CO2:mol ILs). Furthermore, the Gibbs free energy and enthalpy barrier were calculated. Based on this, the two PILs were synthesized in a controlled manner, and the experimental results demonstrated that 0.25 mol/L [C4H14N3]2[C4H2N2O3] and [C4H14N3]2[C3H2N2O2] exhibited a superior CO2 absorption capacity of 3.152 and 3.466 mol CO2/mol ILs, respectively. After five adsorption–desorption experiments, the regeneration rates of [C4H14N3]2[C3H2N2O2] were all higher than 90%. Finally, the reaction mechanism for CO2 capture in these PILs was revealed that the significant increase in capacity could be attributed to the combined absorption of double negative potential N atoms on anions and primary and secondary amines on cations by using 13C NMR.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2021
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IF 3.739
Yuejiao Jiao,Song Han,Weidong Zhang,Min Guo,Fangqin Cheng,Mei Zhang
In this study, adsorbents were self-assembled using CuO-loaded hollow microspheres. Adsorption tests for H 2 S in biogas were performed at room temperature under dry atmosphere. The specific surface area of the adsorbent is 270 m 2 /g, with an adsorption capacity as high as 51.87 mg H 2 S/g, attributed to the well-developed adsorbent pore volume of 0.932 cm 3 /g, wherein mesopores and macropores accounted for 99.14%. In addition, nano-CuO, with a particle size of 5.34 nm, is evenly dispersed on the whiskers of the hollow spheres. These factors provide a good environment for H 2 S adsorption from biogas. The regeneration rate of the adsorbent after the third and fifth regenerations was approximately 80% and 60%, respectively, suitable for the removal of H 2 S from biogas at room temperature under dry atmosphere.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Miaomiao Zhao,Degang Ma,Yu Ye
Cadmium (Cd) contamination in soils is a global ecological threat. Conventional powdered biochar added to soil can temporarily immobilize Cd but is difficult to separate from soil, leading to secondary release of Cd and posing potential ecological and human health risks. The blocky biochar is also difficult to separate from the soil due to its fragile nature. One of the keys to overcome the difficulties in separating biochar from soil is to improve its mechanical strength. Blocky zeolite-biochar composites (ZBC) that have good mechanical strength were obtained after pyrolyzing the mixture of 50% feedstock and 50% zeolite powder at 400 °C. ZBC and NaOH-activated ZBC (ZBC a ) were applied to remove Cd from soil. After sieving Cd-loaded ZBC and ZBC a from soil, the bioavailable Cd content in the soil decreased by 59.70% and 68.54%, respectively. Zeolite contributed to improving both adsorption performance and mechanical properties of the composites. After repeating the process of “remediation-sieving-desorption-regeneration” three times, the recoveries of ZBC and ZBC a were above 97.00%, and regeneration rates were 48.70–83.26%, respectively. Under simulated mechanical sieving conditions, ZBC and ZBC a lost only 4.06% and 5.40% of their mass and retained their integrity. Remediation of Cd-contaminated soil with blocky zeolite-biochar composite is sustainable and safe because the removal of bioavailable Cd from soil is permanent rather than a temporary decrease of bioavailability. This study provides a reference for the preparation of separable and recyclable adsorbents for the removal of contaminants from soil.
研究领域:
环境科学
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土壤修复
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产品关联
DOI
高影响因子
Materials Today Chemistry
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2022
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IF 7.613
J. Lu,Y.-Y. Qin,Y.-L. Wu,Z. Zhu,M.-N. Chen,Y.-S. Yan,C.-X. Li
Since the in-depth exploration of molecularly imprinted membranes (MIMs), compatibility between high selectivity and superior regeneration has been always the focus. Here we propose, based on biomimetic self-polymerization of dopamine, highly specific, self-cleaning, and interfacial-stable g-C 3 N 4 /Ag 3 PO 4 /PDA-composited molecularly imprinted membranes (C/A/D-MIMs) for enhanced treatment of fit-for-purpose water. Ciprofloxacin (CFX) was selected as a representative target because of its potential toxic effect on the microorganism, which will inevitably weaken the traditional biological-based water treatment. Besides superior antifouling performance, remarkable permselectivity ( β NFX/CFX = 1.65, β EFX/CFX = 1.90, and β OFX/CFX = 2.08) and flux regeneration rate (84.4% after photo-regeneration) could be ascribed to (i) effective formation of molecularly imprinted sites by self-polymerization of dopamine, (ii) synergism of polydopamine in constructing Z-scheme heterojunction configuration, as well as (iii) bio-adhesion of polydopamine in coupling photocatalyst and MIMs. Achievements in the present work will promote the development of highly specific and self-cleaning MIMs with considerable stability and applications in specific and selective separation.
研究领域:
材料科学
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环境工程
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化学工程
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水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）