CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Dongshun Deng,Bao Gao,Chao Zhang,Xiuzhi Duan,Yanhong Cui,Jingheng Ning
Ammonia (NH 3 ) is not only a harmful gas to environmental problem, but also a fundamental raw material in chemical industry. The effective separation and recovery of NH 3 from exhaust gas at low cost still remains a challenge for a long time. In this study, a new strategy to construct protic deep eutectic solvents (DESs) by paring NH 4 SCN as hydrogen-bond acceptor with various hydrogen-bond donors [glycerol (G), ethylene glycol (EG), urea (U), acetamide (AT), and caprolactam (CL)] was proposed for efficient and reversible absorption of NH 3 . Results showed that all the DESs possessed exceptional NH 3 absorption capacity and high NH 3 /CO 2 selectivity. At 303 K and 0.10 MPa, the absorption capacity of NH 3 in NH 4 SCN-glycerol (2:3) is as high as 0.223 g NH 3 per g DES, which is much higher than all reported functional ILs and DESs up to date. The NH 3 saturated DES was easily regenerated and recycled 25 times with persistent absorption performance. The influences of DES composition, temperature, NH 3 partial pressure on NH 3 absorption performance were also explored in detail. The absorption mechanism was analyzed using NMR spectroscopy and quantum calculation. These protic NH 4 SCN-based DESs presented as promising absorbents for NH 3 because of their high absorption capacity and good reversibility.
研究领域:
环境化学
·
分离科学
·
绿色溶剂
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气体吸收
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 9
·e5082
·
IF 3.259
Dongmei He,Li Zeng,Guiqing Zhang,Qinggang Li,Wenjuan Guan,Zuoying Cao,Shengxi Wu
A new compound, α-aminophosphonate derivative containing pyridine ring (PPDE), was designed and synthesized as an extractant for the separation of nickel from metal impurities. Over 94.5% of Ni (II) extraction from sulfuric acid solution was achieved by using PPDE with an equilibrium pH of 4.02. Meanwhile, high separation coefficients of 23.8 for Ni to Co, 84.9 for Ni to Mn, 254.1 for Ni to Ca and 696.7 for Ni to Mg, respectively, were obtained. It was noted that PPDE exhibited an excellent regenerability, and the extraction of Ni with the recycled organic phase ranged from 92.5% to 93.9% during six circulations. The extracted nickel complex was determined as [Ni (PPDE) 2 (DNNSA − ) 2 (H 2 O) 4 ], which was supported by the data obtained from Fourier transform-infrared, UV–Vis and electrospray ionization-mass spectrometry spectra.
研究领域:
无机化学
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湿法冶金
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分离科学
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配位化学
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环境化学
·
资源回收
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Bo Wang,Jinyu Wang,Yuan Chen,Zhiyong Xu,Wenbo Zhao
N-Benzyl-N-methyl-1-(methyl diphenyl silyl) methanamine (MPSA) with high thermal stability was synthesized for the absorption of SO 2 in the present work. The absorption capacity was measured at low partial pressures ranging from 0.002 to 0.016 bar and thermodynamic parameters, including enthalpy change (Δ H ) and entropy change (Δ S ) were calculated to analyze the absorption behavior. The desulphurization rates and absorption capacities at different temperatures and partial pressures were simulated based on thermodynamic parameters. An optimal absorption temperature T 1 that maximizes the absorption capacity, and an optimal desorption temperature T 2 that minimizes the desorption residual capacity and thermal desorption energy consumption were defined, and a function was proposed to calculate them. The kinetic behavior of the absorption was described using a pseudo-first-order model, and kinetic data at different temperatures and partial pressures were simulated based on a combination of kinetic and thermodynamic parameters. Ultimately, selectivity and cycles experiment showing MPSA has excellent CO 2 selectivity and thermal regeneration performance.
研究领域:
环境化学
·
气体分离
·
热力学
·
化学工程
·
功能材料
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大气污染控制
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·8026-8038
·
IF 2.936
Shuli Liu,Zhengyang Duan,Changhua He,Xiaojun Xu,Tianguo Li,Yuhuan Li,Xuan Li,Yao Wang,Longqian Xu
Phosphate-modified baker's yeast (PMBY) was prepared, and used as a novel bio-sorbent for the adsorption of Pb2+ from aqueous solution. The influencing factors, absorption isotherms, kinetics, and mechanism were investigated. The scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) characterization and elemental analysis of PMBY showed that phosphate groups were successfully grafted onto the surface of yeast. The kinetic studies suggested that the adsorption process followed a pseudo-second-order chemisorption. The adsorption process of Pb2+ using PMBY was spontaneous and endothermic. Furthermore, the adsorption of Pb2+ on PMBY can rapidly achieve adsorption equilibrium (in just 3 min), and the maximum adsorption capacity of Pb2+ on PMBY was found to be 92 mg g−1 at 30 °C, which was about 3 times that of the pristine baker's yeast. The suggested mechanism for Pb2+ adsorption on PMBY was based upon ion-exchange, electrostatic interaction and chelation between the phosphate groups and Pb2+. However, compared with the pristine baker's yeast, the higher capacity and rapid adsorption of PMBY for Pb2+ was mainly due to the chelation and electrostatic interactions between the phosphate groups and Pb2+. In addition, the regeneration experiments indicated that the PMBY was easily recovered through desorption in 0.01 M HCl, and that PMBY still exhibited 90.77% of the original adsorption capacity for Pb2+ after five regeneration cycles. These results showed the excellent regeneration capability of PMBY for Pb2+ adsorption. PMBY has shown significant potential for the removal of heavy metals from aqueous solution due to its rapid adsorption, high-capacity and facile preparation.
研究领域:
环境科学
·
生物化学
·
环境污染治理
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重金属吸附
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Hao Dong,Huan Tang,Xinxing Shi,Wenlan Yang,Wenjing Chen,Han Li,Yu Zhao,Zhengyong Zhang,Ming Hua
Efficient elimination of fluoride from wastewater is an urgent need for ensuring water safety. In the present study, a stable and reusable nanocomposite (NCO@PAE) was synthesized by impregnating nanosized cerium oxides (NCO) inside a porous polystyrene anion exchanger (PAE) host for efficient fluoride removal from wastewater. The newly fabricated NCO@PAE exhibited excellent resistance to acid and alkali environment, allowing it to be utilized in a wide pH range (2–12). Fluoride uptake onto NCO@PAE was a pH-dependent process, which could reach the maximum capacity at pH 3.0. Compared with its host PAE , NCO@PAE showed conspicuous adsorption affinity towards fluoride in the coexistence of other competing anions at high concentrations. Adsorption kinetics confirmed its high efficiency for achieving equilibrium within 120 min. Fixed-bed adsorption runs demonstrated that the effective processing capacity of NCO@PAE for synthetic fluoride-containing wastewater (initial fluoride 2.5 mg/L) was about ~330 BV (bed volume), while only 22 BV for the host PAE . The exhausted NCO@PAE could be effectively revived by a simple in-situ desorption method for long-term cycle operation without conspicuous capacity loss. All the results indicated that NCO@PAE is a reliable and promising adsorbent for water defluoridation.
研究领域:
环境科学
·
水处理技术
·
材料科学
·
吸附化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2016
·Vol. 23
·期 4
·2539-2548
·
IF 3.195
He Hui,Hou Xunan,Ma Beibei,Zhuang Linzhou,Li Chuanfa,He Shihong,Chen Shuixia
Viscose fiber was oxidized with sodium periodate to prepare a reactive dialdehyde viscose fiber (DAVF) containing abundant aldehyde groups. A solid amine adsorbent (DAVF-PEI) with high amino density for CO 2 capture was then prepared by modifying DAVF with polyethylenimine (PEI). Response surface methodology (RSM) based on a three-level, three-factorial design was used to optimize the synthesis conditions of DAVF, in which multiple linear regression equations of aldehyde content and fiber mass loss degree were constructed. The well-designed DAVF was then employed as a support to graft with PEI via Schiff base reaction to prepare a solid amine fiber (DAVF-PEI) for CO 2 adsorption. The experimental results verified that DAVF-PEI possessed good thermo-stability and high CO 2 adsorption capacity (4.11 mmol/g). DAVF-PEI also showed promising regeneration performance, which could maintain almost the same adsorption capacity for CO 2 after ten adsorption and desorption recycles.
研究领域:
材料化学
·
环境科学
·
高分子科学
·
化学工程
·
吸附分离
·
碳捕集技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2014
·
IF 2.694
Guihua Ruan,Meiping Wei,Zhengyi Chen,Rihui Su,Fuyou Du,Yanjie Zheng
A novel large-volume immobilized enzyme reactor (IMER) on small column was prepared with organic–inorganic hybrid silica particles and applied for fast (10 min) and oriented digestion of protein. At first, a thin enzyme support layer was formed in the bottom of the small column by polymerization with α-methacrylic acid and dimethacrylate. After that, amino SiO 2 particles was prepared by the sol–gel method with tetraethoxysilane and 3-aminopropyltriethoxysilane. Subsequently, the amino SiO 2 particles were activated by glutaraldehyde for covalent immobilization of trypsin. Digestive capability of large-volume IMER for proteins was investigated by using bovine serum albumin (BSA), cytochrome c (Cyt- c ) as model proteins. Results showed that although the sequence coverage of the BSA (20%) and Cyt- c (19%) was low, the large-volume IMER could produce peptides with stable specific sequence at 101–105, 156–160, 205–209, 212–218, 229–232, 257–263 and 473–451 of the amino sequence of BSA when digesting 1 mg/mL BSA. Eight of common peptides were observed during each of the ten runs of large-volume IMER. Besides, the IMER could be easily regenerated by reactivating with GA and cross-linking with trypsin after breaking the –C N– bond by 0.01 M HCl. The sequence coverage of BSA from regenerated IMER increased to 25% comparing the non-regenerated IMER (17%). 14 common peptides. accounting for 87.5% of first use of IMER, were produced both with IMER and regenerated IMER. When the IMER was applied for ginkgo albumin digestion, the sequence coverage of two main proteins of ginkgo, ginnacin and legumin, was 56% and 55%, respectively. (Reviewer 2) Above all, the fast and selective digestion property of the large-volume IMER indicated that the regenerative IMER could be tentatively used for the production of potential bioactive peptides and the study of oriented protein digestion.
研究领域:
生物化学
·
分子生物学
·
蛋白质组学
·
酶工程
·
生物材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）