Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Liwei Sun,Meilin Yin,Shaokun Tang
In this work, short-chain bi-functionalized ionic liquid (IL) was grafted onto mesoporous alumina (MA) for ideal CO 2 /N 2 selectivity . First, bi-functionalized IL 1-(2-carboxymethyl)-3-methoxyethyl-imidazolium bromide ([CmMOEim][Br]) with ether and carboxyl group was successfully synthesized and the initial decomposition temperature is 165 °C. Then low-cost hydroxyl-MA (MA-OH) was obtained from ordered MA (OMA) with the assist of 30 wt% H 2 O 2 solution to prepare [CmMOEim][Br]-grafted MA with different molar ratios of [CmMOEim][Br] and MA-OH via facile chemical reaction without the introduction of alkoxysilanes . MA-OH material presents slit-like structure and more hydroxyl groups compared to OMA sample before hydroxylation. Crystal structure and morphology of grafted material remains unchanged after grafting process. [CmMOEim][Br] is successfully grafted onto MA-OH via the chemical link of carboxyl group on IL and hydroxyl group on MA-OH. Finally, CO 2 and N 2 capture capacities of different materials were separately evaluated at 0.1 MPa and 25 °C. With the increase of IL dosage, CO 2 capture capacity of the grafting material first enhances and then decreases while N 2 capture capacity gradually falls owing to the high CO 2 affinity of [CmMOEim][Br]. Wherein, [CmMOEim][Br]-grafted MA-0.15 exhibits the optimum CO 2 capture capacity of 45.3 cm 3 /g at 25 °C and ambient pressure. The ideal CO 2 /N 2 selectivity of [CmMOEim][Br]-grafted MA can reach up to 30 based on single-component adsorption isotherms , which is higher than that of [CmMOEim][Br] and MA-OH. Furthermore, CO 2 capture capacity, morphology and structure of [CmMOEim][Br]-grafted MA maintain well even after ten cycles.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 35
·19681-19686
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IF 12.732
Zhongjie Yang,Caoyu Yang,Jianyu Han,Wenshi Zhao,Shengxian Shao,Siyu Li,Huiwen Gao,Haijiao Xie,Xiaofei Zhang
Selective electrochemical CO2 reduction to formic acid is an appealing strategy to achieve efficient utilization of CO2. Modification of the catalytic interface with organic linkers has been proven to promote the conversion of CO2 to CO, but the highly selective generation of formic acid is still a challenge. Herein, modification of the interface of graphene oxide (GO) with amide linkages to anchor SnO2 nanoparticles is presented to catalyze the CO2 reduction reaction (CO2RR). As expected, the as-synthesized SnO2/tert-GO shows a competitive high cathodic faradaic efficiency (FE) of 84.4% for formate at −0.96 V and shows long-term stability for the CO2RR. Further, density functional theory (DFT) calculations indicated that amide linkages facilitate the conversion of CO2 to formate.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2021
·
IF 2.262
Yi Zhao,Yangchuan Ke,Xu Hu,Fangfang Peng,Chengcheng Yu,Liang Xing
A new kind of CO2 responsive polymeric surfactant (named DEA-SSS) was synthesized by using 2-(diethylamino)ethyl methacrylate (DEA) and sodium styrene sulfonate (SSS) via radical polymerization. The structure and composition of the copolymer were characterized by FT-IR spectrometer, 1HNMR, and elemental analyzer. It was found that the surface and interfacial tension would be much reduced by adding the synthesized surfactant at low concentration. The amphiphilic copolymer could be dispersed in water after bubbling CO2 and precipitated out upon N2 injection. The variation of copolymer solution with and without CO2 adding was also characterized by electric conductivity meter and transmission electron microscopy (TEM). Pickering emulsion of liquid paraffin in water was prepared using the copolymer as the sole emulsifier with high speed stirring. It was demulsified after purging with CO2 and emulsified again by removal of CO2. The nano-emulsion was made using method of phase inversion composition at elevated temperature through mixing the surfactant with Brij30. When the CO2/N2 were bubbled circularly, the size distribution of nano-emulsions would change reversibly.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Qingxue Liu,Yuefeng Song,Rongtan Li,Houfu Lv,Weicheng Feng,Yuxiang Shen,Xiaomin Zhang,Guoxiong Wang,Xinhe Bao
CO 2 electrolysis through solid oxide electrolysis cells (SOECs) is a promising strategy for converting CO 2 to useful fuels and chemicals powered by renewable energy. Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) is a widely-investigated anode material of SOEC on account of its high and catalytic activity . However, its poor stability under CO 2 atmosphere limits its application as cathode in CO 2 electrolysis. Herein, we develop a vanadium-doped BSCF material Ba 0.5 Sr 0.5 (Co 0.8 Fe 0.2 ) 1-x V x O 3-δ (BSCFV x ) for SOEC cathode. The doping of V into B site of BSCF decreases the basicity of perovskite oxide and increases its stability under CO 2 atmosphere, thus improving the CO 2 electrolysis performance. Compared to BSCF, the cell of BSCFV 0.01 cathode shows a better tolerance to CO 2 and achieves 48.3% increase in current density at 1.6 V and 800 °C.
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Journal of CO2 Utilization
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2021
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IF 7.132
Liang Ma,Long Zhao,Yun Li,Jianbin Zhang
The controllable synthesis of pure vaterite with the good properties and broad application prospects is considered as an important, yet a challenging task because the product properties are greatly affected by reaction conditions. In the present work, the controllable synthesis of pure vaterite crystals was explored with four different Ca 2+ sources including CaCl 2 , Ca(NO 3 ) 2 , CaBr 2 and Ca(Ac) 2 using an CO 2 -storage material (CO 2 SM) prepared by an indirect CO 2 utilization approach as the CO 3 2− source. The effects of five major reaction conditions including reaction medium, hydrothermal reaction temperature, hydrothermal reaction time, Ca 2+ concentration and sources, and pH and conductivity on the crystallization of CaCO 3 were systemically investigated. It is found that the amounts of CO 2 SM required for the formation of pure vaterite phase are in the order of CaBr 2 (20 g/L CO 2 SM) > Ca(NO 3 ) 2 (16 g/L CO 2 SM) > Ca(Ac) 2 (8 g/L CO 2 SM) due to the effects of ethylenediamine (EDA), diethylene glycol (DEG) and their anions. Especially, vaterite was not found in CaCl 2 system. The effects of Ca 2+ sources on the crystal phase composition of CaCO 3 are revealed for the controllable synthesis of CaCO 3 crystals. Our work not only provides a controllable synthesis method of pure vaterite, but also an indirect CO 2 utilization strategy.
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EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Sun-Chang Xi,Hao-Nan Guo,Chang-Yuan Yang,Ren Wang,Dong-Yue Wang,Bin Dong
In this work, an aromatic nitrile containing the pyrimidine moiety and bisimidazolium cations (PyImCl) was synthesized and subsequently employed to prepare a bisimidazolium-based cationic covalent triazine framework (PyImCl-cCTF) through the ionothermal trimerization reaction. The chemical composition and structure of PyImCl-cCTF were carefully revealed by a series of techniques. As examined by N 2 sorption isotherms at 77 K, PyImCl-cCTF exhibited large surface area and abundant microporous structures. Together with the high content of imidazolium cations derived from the bisimidazolium-based monomer, PyImCl-cCTF showed high CO 2 uptake capacity of 235 and 133 mg/g at 1 bar under 273 and 298 K, respectively, superior to the previously reported cCTFs. The dye adsorption performance of PyImCl-cCTF was performed for commonly used dyes. Surprisingly, PyImCl-cCTF exhibited a certain removal effect on both anionic and cationic dyes. Moreover, PyImCl-cCTF with the positively charged skeleton can quickly remove anionic dyes through electrostatic interactions, showing almost 100% removal efficiency within 20 min. These results demonstrate that PyImCl-cCTF can behave as an efficient adsorbent for both CO 2 capture and dye removal to solve environmental problems.
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Small Methods
·
2021
·Vol. 5
·期 11
·2100871
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IF 14.188
Hongfei Cheng,Yumei Liu,Jiawen Wu,Zheng Zhang,Xiaogang Li,Xin Wang,Hong Jin Fan
Electrolyzers coupling electrocatalytic hydrogen evolution with oxidation reactions of small organic molecules have the merits of reducing cell voltage and generating high-value products. Herein, an electrolyzer is designed and optimized that can simultaneously achieve efficient hydrogen generation at the cathode, CO 2 absorption by the catholyte, and methanol upgrading to formate at the anode. For these purposes, transition metal phosphides are used as the low-cost catalysts. The unique electrolyzer exhibits a low working voltage of 1.1 V at 10 mA cm −2 . Under optimal conditions, the Faraday efficiencies of hydrogen evolution and formic acid conversion reactions, which are the reaction products at the cathode and anode, respectively, are nearly 100% at various current densities from 10 to 400 mA cm −2 . Meanwhile, the CO 2 absorption rate is about twice that of the hydrogen generation rate, which is close to the theoretical value. An innovative and energy-efficient strategy is presented in this work to realize simultaneous hydrogen production and CO 2 capture based on low-cost catalyst materials.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zeyu Geng,Qin Xie,Zhongjiao Fan,Weining Sun,Wei Zhao,Junhao Zhang,Jianqiu Chen,Yun Xu
Four tertiary amine-based protic ionic liquids (PILs) have been carefully designed to investigate the performance of SO 2 uptake. Their physical properties of densities and viscosities were determined. In the four PILs, the highest capacity for SO 2 of the four PILs reached up to 5.64 mol/kg ILs (P = 1.0 bar, T = 313.2 K). The ideal selectivity of SO 2 /CO 2 was up to 250 in the separation application of SO 2 from CO 2 . The kinetic study demonstrated that the PILs could efficiently capture SO 2 quickly under the ambient pressure. Based on the SO 2 absorption capacity and selectivity, excellent recyclability , and fast absorption process, the PILs in this work are considered as a potential alternative to traditional absorbents in the flue gas desulfurization (FGD).
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ACS Omega
·
2021
·
IF 3.512
Chunling Xin,Yang Ren,Zhaofei Zhang,Lili Liu,Xia Wang,Jinmei Yang
Hierarchical porous composite Mg-MOF-74/MCFs were successfully synthesized using a simple and facile method under in situ solvothermal conditions. Textural structures and morphologies of the composites were characterized by X-ray diffraction (XRD), N2 adsorption–desorption isotherms, and scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results demonstrate that a large amount of nanosized Mg-MOF-74 particles is incorporated into the pores of mesocellular siliceous foams (MCFs) without remarkable aggregation and the composites possess microporous and mesoporous characteristics of both components. In addition, CO2 adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO2 adsorption capacities were calculated by breakthrough curves. The CO2 adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO2 adsorption capacity of the composites after hydrothermal treatment reaches 2.66 mmol/g, which is larger than that of Mg-MOF-74 (2.39 mmol/g) under the same condition. XRD patterns and SEM images of the composites demonstrate that the hydrothermal stability and CO2 adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1645-1655
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IF 2.647
Bo Shuang,Sun Yue,Li Siyu,Zhou Yuxi,Feng Xuewei,Li Cui
A novel hemoglobin (Hb) imprinted polymers with CO 2 response (CHIPs) were prepared on the surface of Au electrode modified by zinc oxide (CHIPs/ZnO/Au) via electrochemically mediated atom transfer radical polymerization (eATRP). The imprinted polymers were synthesized with Hb both as catalyst and template, and N,N-diethylaminoethyl methacrylate (DEAEMA) as CO 2 -responsive functional monomer. The obtained CHIPs/ZnO/Au electrode was characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and electrochemical methods. The results showed that CHIPs/ZnO/Au electrode could give higher affinity for the target protein inside a CO 2 -treated aqueous medium compared to that under N 2 -treated conditions, which make it a good electrochemical biosensor in the presence of CO 2 . The biosensor could be successfully applied for the determination of Hb by differential pulse voltammetry (DPV) measurement. The linear response range of CHIPs/ZnO/Au for detecting Hb was 1.0×10 −12 ~1.0×10 −1 mg L −1 and the detection limit was 2.1×10 −13 mg L −1 ( S / N =3). Briefly, the work in this study introduced an easy and non-toxic method for Hb determination under specific conditions and also provided a progressive approach for designing protein imprinted polymers.
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Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 14
·3598-3605
·
IF 6.367
Tangxi Chen,Min Zhou,Wen Chen,Yuyao Zhang,Siyong Ou,Yueli Liu
Halide perovskite quantum dots (HP QDs) have been widely used in the field of photocatalysis due to their excellent performance. However, the issues of lead toxicity and instability prevent their process in the photocatalysis application. Herein, the lead-free Cs2AgInCl6 perovskite quantum dots (CAIC QDs) are synthesized by the hot-injection method, and CAIC QDs@Ag composites with various Ag loading amounts are self-assembled by adjusting the Cl source in the synthesis process, which is used to improve the CO2 photoreduction efficiency by using the surface plasmon resonance (SPR) effect of Ag nanoparticles. In addition, the surface ligand density of CAIC QDs@Ag composites is regulated by the purification processing treatment to release the influence of organic ligands on the charge transport performance. It is found that the CAIC QDs@Ag composite with the optimal ligands density possesses fast electron transport and effective carrier separation efficiency, which are crucial for the improvement of the photocatalysis reaction. As a result, the CAIC QDs@Ag-2 composite after purification processing achieves the highest yield of 26.4 μmol g−1 and 28.9 μmol g−1 for CO and CH4, respectively, during the CO2 photoreduction process. In addition, there is no significant decline of CO2 photoreduction performance after the photocatalysis cycling test for 9 h, indicating the good stability of the CAIC QDs@Ag composite in the photocatalysis process.
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ENERGY & FUELS
·
2021
·
IF 3.605
Minghui Zhang,Yingying Liu,Yingming Zhu,Kejing Wu,Houfang Lu,Bin Liang
The complexation of metal ions and amines can mediate the chemical equilibrium and the thermal effect between amines and CO2, thus promoting the absorption and desorption of CO2 in amine absorbents. In this work, the effects of Cu(II) on the performances of CO2 absorption and desorption in the Cu(II)–MMEA (2-(methylamino)ethanol)–H2O system were studied. The thermal desorption results show that the temperature increase during CO2 absorption can be mitigated in the presence of Cu(II), and the desorption performance of CO2 can be obviously improved at 75–95 °C. Using the thermal desorption at 85 °C, the CO2 desorption efficiency of MMEA solution containing 0.1 M [Cu] is 16.4% higher than that without cupric ions, and the regeneration energy consumption is reduced by 25%. The electrochemical research results indicate that the electrode structure and temperature affect the electrolysis rate of anodic copper, and the temperature is the key factor to enhance the CO2 desorption rate. Only considering the decomposition voltage, the energy consumption of the absorbent regeneration is 0.5 GJ/t CO2 at 50 °C, which is much lower than that of the thermal desorption method. The anode current efficiency is always about 100%. Increasing the temperature can increase the cathode current efficiency. When nickel foam with a large specific surface area is used as the cathode, the current efficiency can be increased to 100% at 50 °C. The CO2 desorption is significantly improved in a Cu(II)-assisted MMEA–H2O system. The electrochemical method can achieve a desired desorption at a relatively low temperature and greatly reduce the energy consumption of amine absorbent regeneration.
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