Bioresource Technology Reports
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2020
·
IF 0
Kai Sun,Qingyin Li,Lijun Zhang,Yuewen Shao,Zhanming Zhang,Shu Zhang,Qing Liu,Yi Wang,Xun Hu
Polymerization is one major issue during acid-catalyzed conversion of sugars/furans to platform chemicals. Reaction medium is one of the main factors impacting the tendencies of sugars/furans towards polymerization. In this study, conversion of sugars (fructose/glucose/xylose/xylan) and furans (hydroxymethylfurfural (HMF)/furfural/furfuryl alcohol (FA)) over a solid acidic resin catalyst in various water-organic bi-solvents (toluene, chloroform , n-butanol, tetrahydrofuran (THF), dimethyl sulfoxide (DMSO) and ethyl acetate (EA)) were investigated. The results showed toluene/chloroform as the co -solvent did not suppress the polymerization of fructose, HMF, furfural and FA while diminished the formation of LA from fructose/HMF. The organic co-solvents remarkably affected properties of the coke formed. The presence of aprotic organic solvents tended to retain the C O group in the coke formed and affected its thermal stabilities and evolution of the functionalities. Additionally, polymerization tendency of the furans with the distinct structures showed very different sensitivity with the water in reaction medium.
研究领域:
化学工程
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生物质转化
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催化反应
✓ 已验证
DOI
JOURNAL OF CATALYSIS
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2019
·
IF 7.723
Weiming Wu,Xiao-Yuan Wu,Sa-Sa Wang,Can-Zhong Lu
H 2 and O 2 were produced at separate times from water electrolysis by using silicotungstic acid as an electron-coupled-proton buffer. It was found that the redox property of silicotungstic acid in water could be regulate by the introduction of organic solvents (acetonitrile, DMF and ethanol). The redox wave of silicotungstic acid at ∼0.02 V vs. RHE moved in the negative direction, which was good for the production of hydrogen. A high yield of hydrogen (∼85%) was obtained in a water-ethanol system (V/V = 1:1), which was higher than that in water (∼45%). And the introduction of ethanol didn’t affect the rate of hydrogen evolution. Moreover, the semihydrogenation of organic compounds could be achieved in the present system under mild conditions. The conversion of phenylacetylene and acetophenone are 97% and 80% under optimum reaction conditions, while the selectivity of styrene and 1-phenylethanol are 80% and 82%, respectively.
研究领域:
化学
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催化科学
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能源科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Sha Yu,Yitian Qin,Qi Zhao,Mei Li,Haijun Yu,Guodong Kang,Yiming Cao
Nafion-PTFE hollow fiber composite membranes were applied in the ammonia removal and recovery with a novel aqueous-organic membrane contactor (AOMC) process, in which an aqueous solution and an organic solution were separated by the composite membrane. A kerosene-diluted di-(2-ethylhexyl) phosphoric acid (D2EHPA) solution was used to receive the ammonia, which could be recycled and reused after regeneration by the stripping agent (a dilute solution of H 2 SO 4 , HNO 3 , or H 3 PO 4 ). The new-type membrane contactor can avoid the accompanying water transport in conventional membrane contactors. The effects of experimental factors including the pH, the velocity and the initial ammonia concentration of the feed on the overall mass transfer of the ammonia were investigated. Meanwhile, how the regeneration experiment parameters influenced the stripping ratio was also studied. The results showed that the AOMC process was more favorable to treat ammonia feed with low ammonia concentrations. The ammonia removal could be over 99% under certain conditions. Additionally, the ammonia was concentrated 26.4 times after four cycles. It was found that the accompanying water transport was non-negligible in the traditional aqueous-aqueous membrane contactor (AAMC) process when treating ammonia feed of low concentrations, with the maximum water flux two orders of magnitude higher than ammonia.
研究领域:
环境工程
·
化学工程
✓ 已验证
DOI
高影响因子
ACS SYMPOSIUM SERIES
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2014
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IF 0
Chun He,Yibing Gong,Shuzhen Li,Lingling Hu,Yichang Yang,Lianpeng Sun,Dong Shu
A visible-light-driven photo fuel cell (PFC) system, consisting of a Ag-BiOI/ITO photoanode and a Pt photocathode, was used to generate electricity by using wastewater organic compounds as electrolyte and fuel. The prepared BiOI and Ag-BiOI/ITO photoanodes were characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectroscopy (DRS) to examine the surface structure, chemical composition, and the properties of light absorption. The photoactivity of Ag-BiOI/ITO photoanodes was evaluated in the term of the electricity generation efficiency and degradation efficiency for recalcitrant organic pollutants. Compared with a BiOI/ITO photoanode, it was found that the efficiency of electricity generation using the Ag-BiOI/ITO photoanode was significantly higher in PFC system under visible light. Similarly, the photocatalytic degradation efficiency of wastewater organic pollutants using Ag-BiOI/ITO photoanode was significantly higher than that of BiOI/ITO. The enhancement in the electricity generation efficiency and degradation efficiency for wastewater organic pollutants is attributed to the action of these dopants Ag on BiOI surface, which play a key role by driving the electrons to the cathode via an external circuit.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 35
·35900-35912
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IF 2.914
Deng Hongyu,He Huan,Sun Shijie,Zhu Xintong,Zhou Dongxu,Han Fengxia,Huang Bin,Pan Xuejun
TiO 2 nanoparticle-doped Ag (Ag/TNPs) have good photocatalytic properties based on localized surface plasmon resonance (LSPR) effect. The effluent organic matter (EfOM) can be easily activated by photo-excitation to promote pollutant photodegradation, but excessive EfOM has an inactive effect. Herein, the purpose of this paper is to investigate the changes of photocatalytic performance by Ag/TNPs in the presence of EfOM. Three Ag/TNPs made by condensation crystallization or rotary evaporation crystallization using the sol–gel method were conducted in photocatalytic degradation of methyl orange (MO). The Ag/TNPs crystallized by condensation had greater separation rate of photogenerated electron–hole pairs and photocatalytic degradation of MO with high load rates of binding Ag and TiO 2 than those formed by rotary evaporation crystallization. Indeed, EfOM could be excited to produce the active substances under illumination resulting in the promotion of MO degradation. However, contrary to previous speculation, no additive effect of MO photodegradation was observed with the addition both of EfOM and Ag/TNPs at different pH values (5~9) and ion strength (0~0.4 mol L −1 ). It can be explained that the EfOM changed the morphology and active sites in Ag/TNPs’ surface. Meanwhile, EfOM could be consumed and degraded by Ag/TNP photocatalysis leading to the concentration of free radicals to decrease. This study revealed a nonsynergistic effect between nanomaterial and EfOM for photocatalysis. EfOM would have a negative effect on photocatalytic degradation of organic compounds by Ag/TNPs in the aquatic environment.
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研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 6
·6181-6190
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IF 1.833
Wang Meng-Meng,Liu Shi-Wei,Li Lu,Yu Shi-Tao,Xie Cong-Xia,Song Zhan-Qian
Rosin hydrogenation using polyvinylpyrrolidone (PVP)-stabilized Pd colloidal nanoparticles as catalyst in an aqueous/organic biphasic system was investigated. The influence of preparation methods on the size of Pd nanoparticles for hydrogenation of rosin was marked. Compared with traditional catalysts Pd/C and Raney-Ni, PVP-stabilized Pd colloidal nanoparticles showed excellent catalytic activity and promoted formation of the product tetrahydroabietic acid (THAA). More than 93 % rosin was hydrogenated, and the mass fraction of THAA was 54.2 % when the reaction was carried out at 160 °C for 4 h. It was also found that PVP-stabilized Pd colloidal nanoparticles exhibited good reusability for hydrogenation, with no obvious decrease in catalytic performance when reused six times.
研究领域:
催化化学
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纳米材料
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有机合成
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绿色化学
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胶体化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Xu Chen,Lei Chengjun,Li Jinye,He Xin,Jiang Pengjie,Wang Huijian,Liu Tingting,Liang Xiao
The zinc-copper redox couple exhibits several merits, which motivated us to reconstruct the rechargeable Daniell cell by combining chloride shuttle chemistry in a zinc chloride-based aqueous/organic biphasic electrolyte. An ion-selective interface was established to restrict the copper ions in the aqueous phase while ensuring chloride transfer. We demonstrated that the copper-water-chloro solvation complexes are the descriptors, which are predominant in aqueous solutions with optimized concentrations of zinc chloride; thus, copper crossover is prevented. Without this prevention, the copper ions are mostly in the hydration state and exhibit high spontaneity to be solvated in the organic phase. The zinc-copper cell delivers a highly reversible capacity of 395 mAh g −1 with nearly 100% coulombic efficiency, affording a high energy density of 380 Wh kg −1 based on the copper chloride mass. The proposed battery chemistry is expandable to other metal chlorides, which widens the cathode materials available for aqueous chloride ion batteries.
研究领域:
电化学
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材料科学
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能源存储
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）