Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 5
·1088-1098
·
IF 3.552
Shang Hui,Guo Chong,Ye Pengfei,Zhang Wenhui
Catalytic hydrodesulfurization (HDS) technique is widely used for clean gasoline production. However, traditional HDS catalyst (CoMo/γ-Al 2 O 3 ) exhibits high hydrogenation performance of olefins (HYDO), resulting in the loss of gasoline octane number. To achieve high HDS/HYDO ratio, the key issue is to reduce the interaction between active metals and the support, therefore, in this research, the modified CoMo/γ-Al 2 O 3 catalysts with various boron amounts were investigated under traditional or microwave heating. The effects of preparing methods as well as boron amounts on the active phase, acidic properties and HDS catalytic activities were examined. Results show that the modification, especially under microwave treatment, can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter, and reducing the acidity of the support. As a result, the stacking numbers of MoS 2 slabs were obviously improved by the modification and microwave treatment, contributing to higher edge/ rim ratio, and resulting in higher HDS performance and selectivity to olefin.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 57
·期 1
·351-365
·
IF 4.22
Huo Jiang-Bo,Yu Guoce
While hexacyanoferrate and its analogues are specific adsorbents for elimination of cesium ions (Cs + ), they seem to encounter a major challenge of separation from solution. To solve this difficulty, a novel aerogel adsorbent (polyvinyl alcohol/graphene oxide/KNi[Fe(CN) 6 ], denoted as PVA/GO/KNi[Fe(CN) 6 ]) was designed by a synergistic cross-linking reaction coupled with in situ precipitation strategy. PVA and Ni 2+ firstly played synergistic roles in reinforcement of interwoven structure, and Ni 2+ coordinated with [Fe(CN) 6 ] 3− to produce KNi[Fe(CN) 6 ] in situ in the following step. Characterization analysis revealed a hierarchical structure of the aerogel composed of GO sheets and nanoparticles. This unique structure enhanced adsorption performance compared with PVA/GO. Results indicated that pseudo-second-order model ( R 2 = 0.9971) and intraparticle diffusion model ( R 2 = 1.000, 0.9959 and 0.8513) fitted the kinetic data well, suggesting that the rate-limiting step was governed by the chemisorption and diffusion mechanism. Isotherm data were better described by the Langmuir model ( R 2 = 0.9970), indicating monolayer homogeneous adsorption. The structural investigation verified that the substitution of Cs + for K + (lattice) or for H + (carboxyl groups) was the possible adsorption mechanism. The as-prepared adsorbent exhibited satisfactory adsorption capacity of 47.66 mg/g and a merit of easy separation (as a monolith aerogel) and may be taken as a potential candidate for Cs + cleanup. Graphical abstract
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Parasites & Vectors
·
2022
·Vol. 15
·期 1
·1-12
·
IF 4.047
Qiu Yang-Yuan,Chang Qiao-Cheng,Gao Jun-Feng,Bao Ming-Jia,Luo Hai-Tao,Song Jin-Ho,Hong Sung-Jong,Mao Rui-Feng,Sun Yun-Yi,Chen Ying-Yu,Liu Ming-Yuan,Wang Chun-Ren,Liu Xiao-Lei
Background Clonorchiasis, an infectious disease caused by the liver fluke Clonorchis sinensis , may lead to the development of liver and gallbladder diseases, and even cholangiocarcinoma (CCA). However, the pathogenesis, host-pathogen interaction, and diagnostic markers for clonorchiasis remain unclear. Methods Eighteen rabbits were randomly divided into control group ( n = 9) and C. sinensis -infected group ( n = 9), and their plasma samples were collected at 7, 14, 28, and 63 days post-infection (dpi). Biochemical indices and metabolites in different infection periods were detected. A non-targeted ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) approach was employed to investigate the metabolic profiles of plasma in rabbits, and related metabolic pathways of differential metabolites and correlation between candidate biochemical indices and differential metabolites were analyzed. Finally, the candidate biomarkers were verified with human samples using a targeted metabolomics method. Results The result of biochemical indices indicated C. sinensis infection would affect the liver function biochemical indices, especially alanine aminotransferase, aspartate transaminase (AST), glutamyl transpeptidase (GGT), total bile acid, high-density lipoprotein, and cholinesterase. The metabonomic results showed that 58, 212, 23, and 21 differential metabolites were identified in different phases of the infection. Multivariate statistical analysis of differential metabolites revealed distinct metabolic signatures during different phases of infection, with most of these signatures being observed at 14 dpi, which mainly influences the amino acid metabolisms. For metabolites and biochemical indices, AST, GGT, hypoxanthine, l -pipecolic acid, and d -glucuronate represented potential noninvasive biomarkers for the diagnosis of C. sinensis ( P < 0.05 and AUC > 0.8). Furthermore, GGT and d -glucuronate levels were positively correlated with the infection ( r (28) = 0.98, P < 0.0001) and showed excellent diagnostic performance (AUC = 0.972; 95% confidence interval, 0.921 to 1.000). Conclusions The present results provide new insights into plasma metabolic changes in rabbits during C. sinensis infection, and the potential biomarker may be used for developing an effective method to diagnose clonorchiasis in the future. Graphical Abstract
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 30
·23872-23879
·
IF 2.741
Li Dan,Bi Ran,Chen Hongxing,Mu Lei,Zhang Lina,Chen Qin,Xie Haibo,Luo Yongju,Xie Lingtian
Risk assessing newly synthesized chemicals prior to their applications is extremely important, if we want to ensure substitution of risky chemicals with more benign ones. During the past two decades, many analogs of bisphenol A (BPA) have been manufactured, while their toxicity remains less studied. The aim of this study was to compare the acute toxicity of a synthesized lignin-derived BPA (LD-BP) with that of BPA in representative aquatic organisms including two algal species ( Chlorella pyrenoidosa and Scenedesmus obliquus ), a cladoceran species ( Daphnia magna ), and the Japanese medaka ( Oryzias latipes ). The results revealed that the two algal species showed different responses to the two chemicals. For C. pyrenoidosa , both BPA and LD-BP stimulated growth within 48 h of exposure, except for the 50 mg L −1 of LD-BP treatment. After 96 and 144 h of exposures, BPA stimulated the growth of C. pyrenoidosa at low-exposure concentrations but inhibited its growth at high concentrations, while LD-BP caused a concentration-dependent response in C. pyrenoidosa . S. obliquus exhibited a monotonic concentration-response curve for both BPA and LD-BP exposures. For both D. magna and O. latipes , concentration-responses were monotonic with 96 h–LC 50 of BPA and LD-BP of 11.7 and 5.0 mg L −1 and 9.4 and 4.1 mg L −1 , respectively. Our results demonstrate that LD-BP is more toxic than BPA in the representative aquatic organisms, and it can pose higher ecological risk to the aquatic ecosystem than BPA.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 30
·46200-46213
·
IF 5.19
Wang Yaqiao,Xia Xunfeng,Gao Shengwang,Zhao Xingpeng,Wang Guoying,Han Xue
A novel Ag/BiOBr/CeO 2 composite was successfully prepared for the first time, which had excellent performance in degrading sulfisoxazole (SSX) under visible light irradiation. The as-prepared samples were characterized by SEM, XRD, UV–vis DRS and BET et al. The composite of 10% Ag/BiOBr/CeO 2 showed the best photocatalytic activity and more than 99.5% SSX can be removed within 20 min. It exhibited the highest k value of 0.2428 min −1 , which was about 39.7 times higher than pure BiOBr (6.11 × 10 −3 min −1 ) and 22.1 times higher than BiOBr/CeO 2 (1.09 × 10 −2 min −1 ), respectively. The addition of Ag significantly improved the absorption rate of visible light and the separation rate of photogenerated electron–hole pairs. The initial pH and dosage of samples could have an influence on the photocatalytic activity. The radical trapping experiments proved that · O 2 − and h + were the main active species involved in photocatalytic degradation. Finally, the synthesized catalyst maintained excellent photocatalytic activity after 5 repeated cycles, which indicated the extraordinary stability and recyclability of Ag/BiOBr/CeO 2 . Graphical abstract
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MICROCHIMICA ACTA
·
2012
·Vol. 180
·期 3
·219-226
·
IF 3.033
Jiang Xiujuan,Huang Lingman,Liu Xiaoming
Magnetic nanoparticles (MNPs) coated with silica gel were prepared, then functionalized with a tridentate ligand via a silane coupling agent (3-chloropropyl)triethoxysilane, and finally loaded with Cu(II) ions. The resulting materials were characterized by TEM, SEM, XRD, FTIR and TGA techniques. They display strong affinity for BSA with an adsorption capacity as high as 235 mg g −1 and with a fast (30 min) establishment of adsorption equilibrium. Repetitive adsorptions (6 times) hardly affect the adsorption capability. The kinetics and isotherm of the adsorption of BSA were also investigated.
Core-Shell magnetic nanoparticles functionalised with tridentate ligand BPA which binds Cu(II) were prepared. The materials adsorb BSA with high adsorption capacity (235 mg g −1 ) and fast establishment of adsorption equilibrium (30 min). Repetitive adsorption-desorption (6 times) did not affect significantly the adsorption capacity.
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Environmental Sciences Europe
·
2018
·Vol. 30
·期 1
·1-13
·
IF 4.04
Li Qian,Wang Meng,Duan Lei,Qiu Yanling,Ma Taowu,Chen Ling,Breitholtz Magnus,Bergman Åke,Zhao Jianfu,Hecker Markus,Wu Lingling
Freshwater sediments have been recognized as a long-term sink and potential source for environmental pollutants released into the aquatic ecosystems. In this study, the sediment quality of Taihu Lake, which is susceptible to anthropogenic contamination, was assessed by a combination of chemical analytical and biological end points. Specifically, the snail Bellamya aeruginosa was caged in situ at two locations representing different pollution levels for different exposure times (7, 14 and 21 days). At each of these time points, biochemical parameters, i.e., phase I biotransformation enzymes ethoxyresorufin-O-deethylase (EROD), the antioxidant enzymes superoxide dismutase and catalase, reactive oxygen species, protein carbonyl content and lipid peroxidation, were evaluated in the hepatopancreas of snails. In addition, surface sediments were collected for analysis of contaminants of concern, including inorganic pollutants, organochlorine pesticides, polychlorinated biphenyls and polybrominated diphenyl ethers.Chemical analyses revealed that sediments from Taihu Lake were contaminated with trace elements and organic pollutants. Concentrations of trace elements (Cu, Ni and As) and organochlorinated pesticides (4,4′-DDE) exceeded their corresponding threshold effect level according to the sediment quality assessment values for freshwater ecosystems in Canada, indicating that adverse biological effects may occur. All biomarkers, except EROD activity, were induced in snails during all exposure times. The integrated biomarker response index (IBR) indicated that during the initial exposure phase (7 days), B. aeruginosa were subjected to significant environmental stress, which diminished during later sampling time points.Results showed that IBR correlated well with the levels of environmental contaminants, demonstrating the applicability of this biomonitoring approach to complex environmental exposure scenarios.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 44
·62519-62529
·
IF 4.223
Chang Jingyi,Xiang Wenrui,Qu Ruijuan,Sun Cheng,Wang Zunyao,Zhu Feng,Huo Zongli
Bisphenol AF (BPAF), commonly used as a substitute for bisphenol A (BPA), is also an endocrine disruptor with cytotoxicity, neurotoxicity, genotoxicity, and biotoxicity. In this study, we found that BPAF could be effectively degraded by free chlorine. The second order rate constant of the reaction ranged from 1.67 to 126.67 M −1 ·s −1 in the pH range of 5.0–11.0. Nineteen products were detected by LC-Q-TOF-MS analysis, including chlorinated BPAF (i.e., mono/di/tri/tetrachloro-BPAF), 8 dimers, and 6 trimers. According to the identified products, two transformation pathways of electrophilic substitution and electron transfer are proposed. Humic acid (HA) could inhibit the degradation rate of BPAF due to its ability to reduce the reactive BPAF radical intermediates to the parent compound. The addition of low concentrations of Br − and I − accelerates the reaction rate of BPAF, due to the formation of HOBr and HOI with a higher oxidizing capacity. In seawater, BPAF degraded rapidly, and 16 new halogenated products were formed. Theoretical calculation shows that electrophilic substitution is more prone to occur at the ortho position of the hydroxyl group to form chlorinated products, while electron transfer tends to occur at the hydroxyl oxygen, resulting in the formation of BPAF radical and its subsequent coupling products.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 29
·23187-23195
·
IF 2.779
Yi Junhui,Li Minghao,Xie Runkun,Liao Xiaoying,You Jinfeng,Chen Beifang,Liu Qiqi,Huang Weili
CuBi 2 O 4 is widely used in photocatalytic degradation for pollutants in water due to its strong visible light response characteristics, excellent chemical stability, non-toxic, and low cost. Here, stone-shaped CuBi 2 O 4 was prepared with CuO and Bi 2 O 3 as raw materials by high temperature solid phase. The effect of calcined temperature and time on the product was discussed. This material was analyzed and discussed by XRD, SEM, XPS, and DRS, and the visible light activity of degradation for Orange II was explored. The results showed that the absorption edge of prepared CuBi 2 O 4 expands to the visible region, and the band gap was about 1.77 eV. The photocatalytic degradation rate of Orange II was 42.6% under the optimal conditions. After H 2 O 2 assisted, the degradation rate was more than 2 times, and repeated experiments verified that the prepared catalysts had high stability. Finally, a reasonable mechanism of H 2 O 2 assisted degradation enhancement is proposed. This work gives new ideas for the preparation of new and efficient catalytic materials.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 28
·13767-13784
·
IF 3.553
Li Yulian,He Junyong,Zhang Kaisheng,Hong Peidong,Wang Chengming,Kong Lingtao,Liu Jinhuai
Abstract Magnetic porous manganese ferrite nanoparticles (Mn x Fe 3-x O 4 ) with diverse ingredient Mn/Fe mole ratios were synthesized to degrade sulfamethoxazole (SMX) antibiotic residues involving peroxymonosulfate (PMS) dissociation to produce free radical SO 4 •− , • OH and singlet oxygen 1 O 2 in the absence of heat and light. With the increase in proportion of manganese, the degradation efficiency of SMX increased from 19 to 70% in 30 min. The removal efficiency of SMX increased following the concentration increase of PMS (from 1 ~ 10 mM). After 60 min, the total organic carbon went down by 20%, and the concentration of NH 4 + and NO 3 − accumulated obviously simultaneously. EPR study and chemical probe method, depending on scavenging revealed that SO 4 •− , • OH and 1 O 2 were generated and contributed to the degradation system. Based on the capture of eleven decomposition by-products by LC/MS, two different degradation pathways of SMX were determined, mainly consisting of cleavage of the S–N bond, hydroxylation of benzene and heterocyclic ring, oxidation of amino group and ring-opening cleavage processes. The nanoparticle reuse tests showed that the porous magnetic manganese ferrite nanoparticles could still maintain a high degradation efficiency after five oxidative degradation reactions. The magnetic porous manganese ferrite nanocrystals could activate the PMS to oxidize SMX antibiotic residue without additional energy. Graphic abstract
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-13
·
IF 14.919
Ji Xixi,Lin Yanhong,Zeng Jie,Ren Zhonghua,Lin Zijia,Mu Yongbiao,Qiu Yejun,Yu Jie
Development of excellent and cheap electrocatalysts for water electrolysis is of great significance for application of hydrogen energy. Here, we show a highly efficient and stable oxygen evolution reaction (OER) catalyst with multilayer-stacked hybrid structure, in which vertical graphene nanosheets (VGSs), MoS 2 nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH) x ) are successively grown on carbon fibers (CF/VGSs/MoS 2 /FeCoNi(OH) x ). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm −2 and small Tafel slope of 29.2 mV dec −1 . Theoretical calculation indicates that compositing of FeCoNi(OH) x with MoS 2 could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS 2 /FeCoNi(OH) x anode for overall water splitting, which generates a current density of 100 mA cm −2 at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 12
·3613-3620
·
IF 2.446
Yang Suling,Li Gang,Wang Guifang,Deng Dehua,Qu Lingbo
A novel electrochemical sensor based on Fe 2 O 3 nanoparticles supported on N-doped graphene (Fe 2 O 3 NPs/N–GR) has been fabricated for electrocatalytic oxidation and detection of L-cysteine. The Fe 2 O 3 NPs/N–GR was characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and electrochemical methods. The electrochemical behavior of L-cysteine at Fe 2 O 3 NPs/N–GR was investigated by voltammetry. The Fe 2 O 3 NPs/N–GR showed a very efficient electrocatalytic activity for the oxidation of L-cysteine in 0.1 M phosphate buffer solution (PBS, pH 7.0). The oxidation peak currents increased dramatically at Fe 2 O 3 NPs/N–GR-modified electrode. The potential utility of the sensor was demonstrated by applying it to the analytical determination of L-cysteine. Experimental results showed that the electrocatalytic current increased linearly with L-cysteine concentration in the range of 0.2–400 μM with a lowest detectable concentration of 0.1 μM.
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