JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2015
·
IF 3.512
Ping Yu,Qilong Sun,Jianfeng Li,Zhenjiang Tan,Yongsheng Yan,Chunxiang Li
In the work, we reported an effective method for the preparation of surface molecularly imprinted polymers based on bacillus as substrate material with superparamagnetic property through miniemulsion polymerization. Then, the obtained magnetic surface molecularly imprinted polymers (MMIPs) were evaluated as adsorbents for selective recognition 2,4,6-trichlorophenol (2,4,6-TCP) from aqueous medium. The resulting MMIPs were characterized by several techniques including FT-IR, SEM, TEM, Raman, XRD, VSM and TGA. The results demonstrated rod-shaped MMIPs was covered with imprinted layer, and exhibited chemical stability and good magnetic sensitivity. Batch mode of binding studies were carried out to determine the equilibrium isotherm, kinetics, selectivity adsorption and regeneration of MMIPs toward 2,4,6-TCP. The results indicated that the selective adsorption behaviors of MMIPs were well described by the Langmuir isotherm model and the pseudo-second-order kinetics model. The specific adsorption capacity of MMIPs was 45.16 mg g −1 at 298 K, which was 2.15 times higher than that of magnetic non-imprinted polymers (MNIPs). The selective recognition studies demonstrated the outstanding affinity and selectivity toward 2,4,6-TCP in the presence of competitive phenols . The regeneration study showed excellent adsorption capacity even after five regeneration cycles. In addition, MMIPs were successfully applied to the extraction of 2,4,6-TCP from milk sample.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HETEROCYCLIC CHEMISTRY
·
2021
·Vol. 58
·期 11
·2189-2202
·
IF 2.193
Abdalla Khallaf,Ping Wang,Shuping Zhuo,Hongjun Zhu,Hui Liu
The preparation of novel anthranilic diamide derivatives is extremely important for agricultural pest control. In this study, pyridylpyrazole-4-carboxamides containing a 1,3,4-oxadiazole ring were designed and synthesized via the dehydration of aromatic hydrazine derivatives and formanilides in the presence of an alkali. The insecticidal activities of these new compounds against the diamondback moth ( Plutella xylostella ) were evaluated. N-(4-chloro-2-methyl-6-(5-(4-nitrophenyl)-1,3,4-oxadiazol-2-yl)phenyl)-5-methyl-1-(pyridin-2-yl)-1H-pyrazole-4-carboxamide ( 8h6 ) showed 67%, 50%, 34%, 20%, and 17% activity at concentrations of 100, 50, 10, 5, and 1 μg ml −1 , respectively. Density functional theory calculations showed that the introduction of the 1,3,4-oxadiazole ring significantly changed the electron distributions in both the highest occupied and lowest unoccupied molecular orbitals, resulting in these compounds having much larger energy gaps than the well-known insecticide chlorantraniliprole, which may account for their lower activity. The results of this study demonstrate that anthranilic diamides substituted with a 1,3,4-oxadiazole ring are effective insecticides that can be used for pest management.
研究领域:
农业科学
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2021
·
IF 5.541
H.W. Wang,M.Q. Chen,K. Fu,S.H. Wei,X.B. Zhong
The migration and transformation of trace nuclides (cobalt, cesium and strontium) during pyrolysis and gasification of low-level radioactive waste (plastic, glove, coverall , paper towel, sawdust and mixture) were evaluated based on two lab-scale fixed-bed reactors and chemical equilibrium calculation. Co and Cs mobilities in plastic were both higher than that of glove at the same pyrolysis temperature. From the test of cesium migration, the mobilities of cesium in plastic and glove due to the addition of ZrO 2 (wt.1%) during thermal treatment almost reduced by one half or above, indicating that ZrO 2 was a favorable agent for immobilization of cesium . Phosphorus and sulphur in low-level radioactive waste could resist the migration of Co. The pyrolysis temperature for the mixture should be kept below 509 ºC to prevent the cesium migration. Chlorine in the samples could increase the migration of Cs. The gasification temperature should be kept below 1200 ºC to prevent cobalt and strontium migration. Negative micro-pressure operation did not impact greatly the migration of the trace nuclides. CsOH (g) in plastic and CsCl (g) in mixture decreased both by about 91% by increasing the pressure from 0.1 MPa to 1.0 MPa, indicating that lifting the pressure could effectively resist the migration of the trace nuclides.
研究领域:
核废物处理
·
放射化学
·
热处理技术
·
环境科学
·
废弃物管理
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-11
·
IF 5.3
Zhou Jie,Li Yaru,Li Yan,Lan Jing,Zhao Zongshan,Shi Rongguang
A new sensor based on copper-zinc bimetal embedded and nitrogen-doped carbon-based composites (CuZn@NC) was prepared for triclosan (TCS) detection by pyrolyzing the precursor of Cu–Zn binuclear metal–organic framework (MOF). The performance for detecting TCS was evaluated using linear scanning voltammetry (LSV) and differential pulse voltammetry (DPV), and the proton and electron numbers during TCS oxidation have been proved to be one-to-one. The results indicated that CuZn@NC can present a satisfactory analysis performance for TCS detection. Under the optimized conditions, the linear response range was 0.2–600 µM and the detection limit was 47.9 nM. The sensor presented good stability (signal current dropped only 2.5% after 21 days) and good anti-interference of inorganic salts and small molecular organic acids. The good recovery (97.5–104.1%) for detecting spiked TCS in commercial products (toothpaste and hand sanitizer) suggested its potential for routine determination of TCS in real samples. Graphical abstract
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2017
·Vol. 83
·期 23
·
IF 3.807
Cui-Wei Chu,Bin Liu,Na Li,Shi-Gang Yao,Dan Cheng,Jia-Dong Zhao,Ji-Guo Qiu,Xin Yan,Qin He,Jian He
Thiobencarb is a thiocarbamate herbicide used in rice paddies worldwide. Microbial degradation plays a crucial role in the dissipation of thiobencarb in the environment. However, the physiological and genetic mechanisms underlying thiobencarb degradation remain unknown. In this study, a novel thiobencarb degradation pathway was proposed in Acidovorax sp. strain T1. Thiobencarb was oxidized and cleaved at the C—S bond, generating diethylcarbamothioic S-acid and 4-chlorobenzaldehyde (4CDA). 4CDA was then oxidized to 4-chlorobenzoic acid (4CBA) and hydrolytically dechlorinated to 4-hydroxybenzoic acid (4HBA). The identification of catabolic genes suggested further hydroxylation to protocatechuic acid (PCA) and finally degradation through the protocatechuate 4,5-dioxygenase pathway. A novel two-component monooxygenase system identified in the strain, TmoAB, was responsible for the initial catabolic reaction. TmoA shared 28 to 32% identity with the oxygenase components of pyrimidine monooxygenase from Agrobacterium fabrum, alkanesulfonate monooxygenase from Pseudomonas savastanoi, and dibenzothiophene monooxygenase from Rhodococcus sp. TmoB shared 25 to 37% identity with reported flavin reductases and oxidized NADH but not NADPH. TmoAB is a flavin mononucleotide (FMN)-dependent monooxygenase and catalyzed the C—S bond cleavage of thiobencarb. Introduction of tmoAB into cells of the thiobencarb degradation-deficient mutant T1m restored its ability to degrade and utilize thiobencarb. A dehydrogenase gene, tmoC, was located 7,129 bp downstream of tmoAB, and its transcription was clearly induced by thiobencarb. The purified TmoC catalyzed the dehydrogenation of 4CDA to 4CBA using NAD+ as a cofactor. A gene cluster responsible for the complete 4CBA metabolic pathway was also cloned, and its involvement in thiobencarb degradation was preliminarily verified by transcriptional analysis.IMPORTANCE Microbial degradation is the main factor in thiobencarb dissipation in soil. In previous studies, thiobencarb was degraded initially via N-deethylation, sulfoxidation, hydroxylation, and dechlorination. However, enzymes and genes involved in the microbial degradation of thiobencarb have not been studied. This study revealed a new thiobencarb degradation pathway in Acidovorax sp. strain T1 and identified a novel two-component FMN-dependent monooxygenase system, TmoAB. Under TmoAB-mediated catalysis, thiobencarb was cleaved at the C—S bond, producing diethylcarbamothioic S-acid and 4CDA. Furthermore, the downstream degradation pathway of thiobencarb was proposed. Our study provides the physiological, biochemical, and genetic foundation of thiobencarb degradation in this microorganism.
研究领域:
环境微生物学
·
分子生物学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 24
·4995-4999
·
IF 3.919
Zhihai Hao,Hou Chen,Delong Liu,Lijun Fan
Sn(0)-mediated single electron transfer-living radical polymerization (SET-LRP) of acrylonitrile (AN) with carbon tetrachloride (CCl 4 ) as initiator and hexamethylenetetramine (HMTA) as ligand in N, N -dimethylformamide (DMF) was studied. The polymerization obeyed first order kinetic. The molecular weight of polyacrylonitrile (PAN) increased linearly with monomer conversion and PAN exhibited narrow molecular weight distributions. Increasing the content of Sn(0) resulted in an increase in the molecular weight and the molecular weight distribution. Effects of ligand and initiator were also investigated. The block copolymer PAN- b -polymethyl methacrylate with molecular weight at 126,130 and polydispersity at 1.36 was successfully obtained. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
·
聚合反应
·
功能高分子
·
材料化学
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2017
·
IF 2.847
Peiwen Wang,Nan Zhao,Yizhen Tang
Methyl iodine (CH3I) and carbon tetrachloride (CCl4) are both important volatile precursors for atmospheric ozone destruction. CH3I and CCl4 can act as halogen bond donors to form molecular complexes with atmospheric organic species, such as 2,5-dihydrofuran, tetrahydrofuran, and acetone. This study characterized the halogen bonds in the CH3I and CCl4 complexes using matrix isolation infrared spectroscopy and density functional theory calculations. With the combination of vibrational frequencies in spectra and the calculated interaction energies, frequencies and atoms-in-molecules analyses, we confirmed the formation of halogen-bonded complexes. CH3I as a halogen-bond donor is comparable or slightly weaker than CCl4, and furans involving ether oxygens are better halogen acceptors than acetone. The results help to understand the possibilities of formation of atmospheric molecular complexes that may influence the atmospheric chemical activities and enhance the aerosol formation.
研究领域:
物理化学
·
大气化学
·
光谱学
·
量子化学计算
·
分子间作用力
·
环境化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 3
·669-677
·
IF 2.557
Shi-Bin Qin,Yu-Han Fan,Xiao-Shui Li,Yuan Zhang,Shi-Hua Qi
A time-saving method was applied to synthesize methyltrimethoxy-modified magnetic mesoporous silica with or without p -toluenesulfonic acid as the catalyst for magnetic solid-phase extraction. The synthesized materials were systematically characterized. Results demonstrated that methyltrimethoxy modified magnetic mesoporous silica with p -toluenesulfonic acid as the catalyst has a relatively smaller aperture and extreme hydrophobicity (water contact angle of 135°). To evaluate the feasibility of these prepared materials as effective adsorbents, it was combined with gas chromatography and electron capture detection to determine 26 polychlorinated biphenyls in environmental water. The result revealed that methyltrimethoxy modified magnetic mesoporous silica with p -toluenesulfonic acid as the catalyst had the best extraction efficiency and recovery. Under the optimized extracted conditions, the proposed method showed good linearity within the concentration range of 5 to 200 ng/L with correlation coefficients of 0.9969 to 0.9999. The limits of detection and quantification based on signal-to-noise ratios of 3 and 10 were in the range of 0.16 to 0.91 and 0.52 to 3.0 ng/L, respectively. The polychlorinated biphenyl concentrations in environmental water samples were successfully determined using the developed method. PCB008 and PCB110 were 4.05 and 8.52 ng/L in Red-Star lake water (Hubei Province, China), respectively.
研究领域:
分析化学
·
环境科学
·
材料科学
·
污染生态学
·
色谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Wanyi Fu,Lan Wang,Fangjuan Chen,Xuezhi Zhang,Wen Zhang
To unravel fouling and defouling mechanisms of protein, saccharides and natural organic matters (NOM) on polymeric membrane during filtration, this study investigated filtration characteristics on polyvinyl chloride (PVC) ultrafiltration membranes with bovine serum albumin, dextran , humic acid as model foulants. Membrane fouling and defouling performances were analyzed through monitoring the flux decline during filtration and flux recovery during physical backwash. Physico-chemical properties (e.g., hydrophobicity and surface charge) of PVC membrane and foulants were characterized, which were used in the extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory to calculate the interaction energies between membrane-foulant and foulant-foulant. The results showed that at the later filtration stages the fouling rate was strongly correlated with the deposition rate , which was determined by the interaction energy profile calculated by EDLVO. Moreover, the adhesion forces of membrane–foulant and foulant–foulant were further measured by atomic force microscopy (AFM) with modified colloidal probes. A positive correlation ( R 2 = 0.845) between particle detachment rate (determined by adhesion force) and defouling rate was developed for BSA and HA foulants that led to cake layer formation. By contrast, dextran defouling rate was off this correlation as dextran partially clogged membrane pores due to its smaller size.
研究领域:
环境科学
·
膜分离技术
·
高分子材料
·
胶体与界面化学
·
水处理
✓ 已验证
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2025
·
IF 3.2
Dan Yu,Xiaomei Guo,Yang Liu
Utilization of kiwi peel (KP) is proposed for gold recovery from electronic wastes (e-wastes). KP was simply modified by dehydration pretreatment with concentrated sulfuric acid. Among of the e-wastes metals, modified KP exhibited high selectivity on Au(III) adsorption. Ions dependencies on adsorption revealed that the increased chloride ion concentration has inhibition to Au(III) adsorption. After Au(III) adsorption, microscope images found gold particles on the adsorbents surface. X-ray diffraction analyses suggested that Au(III) reduction occurred along with the adsorption process, till the adsorption reached the equilibrium. Modified KP exhibited higher adsorption capacity (5.71 mmol g–1) than original KP (lower than 0.5 mmol g–1) or other natural adsorbents. Modification improved the adsorption capacity of KP. Gold was successfully recovered from the mixed precious metals through the adsorption and elution. KP waste is an applicable adsorbent with rich resource and high adsorption capacity.
研究领域:
环境科学
·
冶金学
·
材料科学
·
化学工程
·
废弃物管理
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Jiahao Yu,Shanlin Xu,Gulden Goksen,Caifu Yi,Ping Shao
Deep eutectic solvents (DES) as plasticizers of chitosan film show great potential for food packaging. This paper introduced some novel antioxidant and antibacterial films based on chitosan and DES consisting of choline chloride (ChCl) and organic acids. The effects of the composition and contents of choline-based DES on structures, mechanical properties, thermal stability, contact angle, optical, antioxidant and antibacterial properties of chitosan films were studied. FTIR analysis showed that choline-based DES did exist in the chitosan film with good polymer matrix compatibility. Most of the films exhibited uniform, flat surfaces and cross sections. The Young's modulus of the films decreased inversely to the level of choline-based DES, and maximal mechanical characteristics were achieved for films plasticized with ChCl and acetylsalicylic acid. The addition of choline-based DES apparently reduced water contact angles, decreased the decomposition temperature and the thermal stability of chitosan films. In terms of antioxidant capacities and ultraviolet (UV) shielding, chitosan films plasticized with choline-based DES containing acetylsalicylic acid and vitamin C had strong UV shielding and antioxidant properties. Chitosan films plasticized with choline-based DES containing acetylsalicylic acid, malonic acid and lactic acid showed excellent antibacterial properties against Escherichia coli and Staphylococcus aureus . In conclusion, the chitosan film with the choline-based DES, especially for ChCl and acetylsalicylic acid showed a good application prospect in food active packaging.
研究领域:
材料科学
·
食品科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Global Antimicrobial Resistance
·
2016
·
IF 1.087
Dongmei Wu,Ruochen Lu,Yuquan Chen,Jie Qiu,Chaocheng Deng,Qiang Tan
This study aimed to determine whether selection by antibiotics, chlorhexidine (CHX) and Rhizoma coptidis extract (RCE) would lead to cross-resistance or decreased susceptibility in Staphylococcus aureus . The S. aureus reference strain ATCC 25923 as well as 14 clinical isolates were exposed to antibiotics, CHX and RCE at sublethal doses for up to 14 days. Changes in susceptibility were determined by analysis of minimum inhibitory concentrations (MICs). All isolates were cross-resistant to more than one other antibiotic following tetracycline exposure, and increased resistance (≥4-fold MIC increase) to RCE and CHX was observed in six and three isolates, respectively. Following selection by CHX, most of the treated strains showed no significant change in sensitivity to CHX. However, all strains developed cross-resistance to at least one antibiotic, and decreased susceptibility (≥4-fold MIC increase) to RCE appeared in seven strains. Following exposure to RCE, 11 isolates showed cross-resistance to at least one antibiotic. In addition, three RCE-exposed strains showed reduced susceptibility to CHX (4- or 8-fold MIC increase). The results obtained in this study imply that antibiotics, biocides and antimicrobial Chinese herbs might employ some of the same mechanisms of action against bacteria, triggering mutual cross-resistance to further foster the development of bacterial resistance.
研究领域:
微生物学
·
感染病学
·
药理学
·
分子生物学
·
抗菌药物耐药性
·
天然药物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）