LUMINESCENCE
·
2013
·Vol. 29
·期 2
·151-157
·
IF 1.273
Wei Bian,Jing Ma,Qiaoling Liu,Yanli Wei,Yingfu Li,Chuan Dong,Shaomin Shuang
N -acetyl- l -cysteine-capped Mn-doped ZnS quantum dots (QDs) were prepared by hydrothermal methods. It could emit phosphorescence at 583 nm with the excitation wavelength at 315 nm. The phosphorescence intensity of QDs could be quenched dramatically by increasing the concentration of Co 2+ ion. The novel phosphorescence sensor based on N -acetyl- l -cysteine-capped QDs was developed for detecting Co 2+ ion with a linear dynamic range of 1.25 × 10 –6 –3.25 × 10 –5 m . The limit of detection and RSD were 6.0 × 10 –8 m and 2.3%, respectively. Interference experiments showed excellent selectivity over numerous cations such as alkali, alkaline earth and transitional metal ions. The possible quenching mechanism was also examined by phosphorescence decays. The proposed phosphorescence method was further applied to the trace determination of Co 2+ ion in tap and pond water samples with recoveries of 97.75–103.32%. Copyright © 2013 John Wiley & Sons, Ltd.
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JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Yifan Li,Xueqin Li,Hong Wu,Qingping Xin,Shaofei Wang,Ye Liu,Zhizhang Tian,Tiantian Zhou,Zhongyi Jiang,Hongwei Tian,Xingzhong Cao,Baoyi Wang
Calcium lignosulfonate (CaLS) is an organic anionic surfactant , which has been used for the first time as a charged additive to improve the performance of Pebax membranes for CO 2 separation. Owing to the abundant hydrophobic groups and low charge density of lignosulfonate ion (LS 2− ), CaLS was found to efficiently interrupt the chain packing of Pebax 1657 matrix via both metal-organic complexation and hydrophobic interaction, endowing membranes with tunable fractional free volume (FFV). For dry membranes, CaLS could slightly enlarge membrane FFV without forming highly crosslinked structures. For humidified membranes, water-induced swelling led to a remarkable enhancement of FFV, while the hydrophobic interaction between CaLS and Pebax avoided excessive swelling. With the coexistence of CaLS and water, optimal FFV and moderate salting-out effect were acquired, resulting in very high CO 2 permeability (3585 Barrer) and fairly good CO 2 /gas selectivity (29 for CO 2 /CH 4 and 71 for CO 2 /N 2 ). The separation mechanism was discussed by analyzing the relationship between salting-out effect and the well-known solution-diffusion mechanism. Based on the performance comparison of Pebax–CaLS membrane with the previously reported Pebax–salt membranes, the guideline about the design of polymer electrolyte membranes for CO 2 capture was tentatively proposed.
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 68
·42819-42825
·
IF 3.108
Yanghe Fu,Huan Yang,Rongfei Du,Gaomei Tu,Chunhui Xu,Fumin Zhang,Maohong Fan,Weidong Zhu
Co-doped NH2-MIL-125(Ti) catalysts [Co/NH2-MIL-125(Ti)] are developed for the photocatalytic reduction of CO2 upon visible-light irradiation. Compared with NH2-MIL-125(Ti), Co/NH2-MIL-125(Ti) exhibits a significantly enhanced activity in CO2 reduction, due to the fact that the doping of Co nanoparticles onto NH2-MIL-125(Ti) can promote the visible-light harvesting and electron transfer. In addition, when benzylic alcohols as electron donors, instead of triethanolamine (TEOA) which is often used as a sacrificial agent, are added into the reaction system, Co/NH2-MIL-125(Ti) can simultaneously catalyze CO2 reduction to formic acid (HCOOH) and the selective oxidation of the benzylic alcohols to the corresponding aldehydes, making the proposed process more economical and environment-friendly.
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GREEN CHEMISTRY
·
2016
·Vol. 18
·期 12
·3537-3548
·
IF 8.506
Jun Ni,Fei Tao,Yu Wang,Feng Yao,Ping Xu
Many plant natural products have remarkable pharmacological activities. They are mainly produced directly by extraction from higher plants, which can hardly keep up with the surging global demand. Furthermore, the over-felling of many medicinal plants has undesirable effects on the ecological balance. In this study, we constructed a photoautotrophic platform with the unicellular cyanobacterium Synechococcus elongatus PCC7942 to directly convert the greenhouse gas CO2 into an array of valuable healthcare products, including resveratrol, naringenin, bisdemethoxycurcumin, p-coumaric acid, caffeic acid, and ferulic acid. These six compounds can be further branched to many other precious and useful natural products. Various strategies including introducing a feedback-inhibition-resistant enzyme, creating functional fusion proteins, and increasing malonyl-CoA supply have been systematically investigated to increase the production. The highest titers of these natural products reached 4.1–128.2 mg L−1 from the photoautotrophic system, which are highly comparable with those obtained by many other heterotrophic microorganisms using carbohydrates. Several advantages such as independence from carbohydrate feedstocks, functionally assembling P450s, and availability of plentiful NADPH and ATP support that this photosynthetic platform is uniquely suited for producing plant natural products. This platform also provides a green route for direct conversion of CO2 to many aromatic building blocks, a promising alternative to petrochemical-based production of bulk aromatic compounds.
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Mineral Processing and Extractive Metallurgy Review
·
2017
·
IF 1.219
Zijian Su,Yuanbo Zhang,Bingbing Liu,Yingming Chen,Guanghui Li,Tao Jiang
A selective reduction volatilization (SRV) process developed by the authors was effective to remove tin from the complex tin-bearing iron concentrates. It is reported that many gangue minerals of quartz, calcite, and fluorite are existent in the concentrates. Our previous studies investigated the effect of quartz and calcite on the removal of tin. In this study, the effect of fluorite (calcium fluoride) was conducted, and pure CaF2 was added into the tin-bearing iron concentrates to investigate how CaF2 affected the tin volatilization behavior under different roasting conditions. The effect of CaF2 on the phase transformation of SnO2 was also determined using SEM-EDS and XRD. The results indicated that SnF2 was much easier to volatilize than SnO under CO-CO2 atmosphere in the presence of CaF2, so the calcium fluoride in the concentrates was beneficial to promote the tin removal during the SRV process.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.083
Yaqiong Zhu,Qian Liu,Aisheng Huang
The separation of CO2/CH4 is reported in detail by using zeolitic imidazolate framework (ZIF-8) membrane which was prepared on 3-aminopropyltriethoxysilane modified Al2O3 tube through microwave heating synthesis. Attributed to the preferential adsorption affinity of CO2 over CH4 and a narrow pore window of 0.34 nm, the ZIF-8 membrane shows high separation performances for the separation of CO2/CH4 mixtures. For the separation of equimolar CO2/CH4 mixture at 100°C and 2 bar feed (1 bar permeate) pressure, a CO2 permeance of 1.02 × 10−8 mol/m2· s· Pa and a CO2/CH4 selectivity of 6.8 are obtained, which is promising for CO2 separation.
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MATERIALS & DESIGN
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2016
·
IF 3.997
Haipeng Bai,Yaping Zheng,Ruilu Yang
Six kinds of liquid-like trisilanol isobutyl-POSS derivatives are designed and synthesized to study the influences of their structures on capturing CO 2 . The derivatives are different in bonding types, NH content, flow ability, grafting ratio or molecular size. The CO 2 capture property of these derivatives is tested. It is found that bonding types can affect the recycle property, NH content can affect the chemical absorption , molecular size can affect the physical adsorption, and flow ability can affect both chemical absorption and physical adsorption. Furthermore, the physical adsorption is determining factor that cause differences from liquid-like derivatives to traditional amine based solvents CO 2 absorbents.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zezhou Zhu,Jiani Qin,Min Jiang,Zhengxin Ding,Yidong Hou
Photocatalytic reduction of carbon dioxide can convert chemically inert carbon dioxide into useful chemical fuel in a mild manner. Herein, Ag-CdS nanocomposites were prepared by photodeposition method and examined for photocatalytic CO 2 reduction under visible light. Meanwhile, the nanocomposites were characterized by XRD, SEM, TEM, XPS, DRS and PL in detail. The results show that, the deposition of Ag improves the photocatalytic performance of CdS, especially in the selectivity of CO 2 -to-CO. The highest photocatalytic activity is achieved over 1.0 wt.% Ag/CdS, with an increase by 3 times in comparison to CdS. In this reaction system, Ag can serve as electron trap as well as active site for CO 2 reduction, which is probably responsible for the enhanced activity and selectivity of CO 2 to CO over Ag/CdS. The possible mechanism of CO 2 photoreduction over Ag/CdS was proposed in view of the abovementioned analysis.
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AICHE JOURNAL
·
2017
·Vol. 63
·期 11
·4933-4943
·
IF 2.836
Bin Liu,Xiao Luo,Zhiwu Liang,Wilfred Olson,Helei Liu,Raphael Idem,Paitoon Tontiwachwuthikul
CO 2 absorption into aqueous solutions of two tertiary alkanolamines, namely, MDEA and DMEA with and without carbonic anhydrase (CA) was investigated with the use of the stopped-flow technique at temperatures in the range of 293–313 K, CA concentration varying from 0 to 100 g/m 3 in aqueous MDEA solution with the amine concentration ranging from 0.1 to 0.5 kmol/m 3 , and CA concentration varying from 0 to 40 g/m 3 in aqueous DMEA solution with the amine concentration ranging from 0.05 to 0.25 kmol/m 3 . The results show that the pseudofirst-order reaction rate (k 0, amine ; s −1 ) is significantly enhanced in the presence of CA as compared with that without CA. The enhanced values of the kinetic constant in the presence of CA has been calculated and a new kinetics model for reaction of CO 2 absorption into aqueous tertiary alkanolamine solutions catalyzed by CA has been established and used to make comparisons of experimental and calculated pseudo first-order reaction rate constant (k 0, with CA ) in CO 2 -MDEA-H 2 O and CO 2 -DMEA-H 2 O solutions. The AADs were 15.21 and 15.17%, respectively. The effect of pKa on the CA activities has also been studied by comparison of CA activities in different tertiary amine solutions, namely, TEA, MDEA, DMEA, and DEEA. The pKa trend for amines were: DEEA > DMEA > MDEA > TEA. In contrast, the catalyst enhancement in amines was in the order: TEA> MDEA> DMEA> DEEA. Therefore, it can be seen that the catalyst enhancement in the amines decreased with their increasing pKa values. © 2017 American Institute of Chemical Engineers AIChE J , 2017
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Min Jiang,Yilin Gao,Zhaoyu Wang,Zhengxin Ding
Spinel CuCo 2 O 4 nanoplates were synthesized through a solvothermal method coupled with a calcination treatment in air. The prepared CuCo 2 O 4 samples were fully characterized by diverse physical and chemical techniques including powder X-ray diffraction (XRD), field emission scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and N 2 sorption measurement. The CuCo 2 O 4 material was developed as an efficient, low-cost and stable cocatalyst to boost photochemical CO 2 conversion with Ru(bpy) 3 2+ as a homogeneous photosensetizer. The catalytic performance of the CuCo 2 O 4 samples was evaluated toward visible-light-driven deoxygenative reduction of CO 2 to CO under mild conditions. Various parameters of the reaction system and the synthesis conditions of CuCo 2 O 4 were investigated and optimized to maximize the catalytic performance of CO 2 reduction system. The stability and the reusability of the CuCo 2 O 4 cocatalyst were examined. Moreover, the CuCo 2 O 4 cocatalyst was further proved to be highly active to promote CO 2 photoreduction catalysed by CdS semiconductor as a heterogeneous light harvester, and markedly reinforced photocatalytic CO 2 reduction performance was achieved.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Lihuo Zhang,Ni Zhan,Qing Jin,Honglai Liu,Jun Hu
Amine-impregnated solid sorbents have been approved as one of the promising sorbents for CO2 capture. However, the low adsorption rate seriously limits their real application. Herein, we synthesized the mesoporous multilamellar silica vesicle (MMSV) and used them as a novel support for the impregnation of polyethylenimine (PEI). The mesoporous multilamellar structure, as well as the presence of surfactant templates, significantly improved the dispersion of PEI in sorbents and hence improved both adsorption capacity and adsorption rate simultaneously. Among various MMSV-PEIs samples, MMSV(a)-PEI-60% showed the best CO2 adsorption capacity, up to 4.73 mmol/g in pure and dry CO2 flow at 90 °C, and even exhibited a 22% enhancement in humid CO2 flow at 75 °C. Moreover, it also presented good adsorption/desorption cyclic performance. The kinetic study showed that the second-order kinetic model fitted quite well for dynamic CO2 adsorption, and the adsorption rate constants revealed its faster adsorption rate and higher amine efficiency compared with most reported amine-impregnated sorbents.
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ENERGY & FUELS
·
2017
·
IF 3.091
Yue Zhao,Yangyang Bian,Hui Li,Hui Guo,Shufeng Shen,Jiangze Han,Dongfang Guo
Aqueous monoethanolamine (MEA) is widely used for CO2 capture and has been demonstrated as an effective absorbent in many postcombustion capture plants. However, several disadvantages such as toxicity, high volatility, solvent degradation, and high energy consumption were reported in the practical applications. Aqueous amino acid salts, particularly potassium lysinate (LysK), are considered as attractive alternatives to MEA. A comparative study of absorbent characteristics of aqueous LysK (2.0 M and 2.5 M) and aqueous MEA (5.0 M) was conducted in this study. The absorption and cyclic capacities, absorption and desorption rate, solubility of CO2, and heat of absorption were measured using a stirred batch-type reactor and a CPA201 reaction calorimeter under similar postcombustion capture conditions. Thermal and oxidative degradation was also evaluated for aqueous 2.0 M LysK at 383 and 423 K under static N2 and O2 exposure conditions for 15 days. Samples were analyzed by total alkalinity and 13C and 1H NMR spectra to provide insight into the degradation products. The advantages of the comparable CO2 capture performance, high stability, and low solvent loss compared to the state-of-the-art solvent MEA, suggest LysK can be a potentially advantageous absorbent for industrial CO2 capture processes.
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