ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Ni-Hong Yao,Ya-Nan Du,Jia-Xi Xiong,Ying Xiao,Hang-Hang He,Ze-Feng Xie,Duo Huang,Qi Song,Jing Chen,Dazhong Yan,Hong-Jun Chao
The compound 3,5-xylenol is an essential precursor used in pesticides and industrial intermediate in the disinfectants and preservatives industry. Its widespread application makes it an important source of pollution. Microbial bioremediation is more environmentally friendly than the physicochemical treatment process for removing alkylphenols from a polluted environment. However, the 3,5-xylenol-degrading bacteria is unavailable, and its degradation mechanism remains unclear. Here, a 3,5-xylenol-metabolizing bacterial strain, designated Rhodococcus sp. CHJ602, was isolated using 3,5-xylenol as the sole source of carbon and energy from a wastewater treatment factory. Results showed that strain CHJ602 maintained a high 3,5-xylenol-degrading performance under the conditions of 30.15 °C and pH 7.37. The pathway involved in 3,5-xylenol degradation by strain CHJ602 must be induced by 3,5-xylenol. Based on the identification of intermediate metabolites and enzyme activities , this bacterium could oxidize 3,5-xylenol by a novel metabolic pathway. One methyl oxidation converted 3,5-xylenol to 3-hydroxymethyl-5-methylphenol, 3-hydroxy-5-methyl benzaldehyde, and 3-hydroxy-5-methylbenzoate. After that, another methyl oxidation is converted to 5-hydroxyisophthalicate, which is metabolized by the protocatechuate pathway. It is catalyzed by a series of enzymes in strain CHJ602. In addition, toxicity bioassay result indicates that 3,5-xylenol is toxic to zebrafish and Rhodococcus sp. CHJ602 could eliminate 3,5-xylenol in water to protect zebrafish from its toxicity. The results provide insights into the bioremediation of wastewater contaminated 3,5-xylenol.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Wenyang Fan,Houchun Yan,Huiwen Huang,Yixin Ma,Jun Gao,Dongmei Xu,Yinglong Wang
For separating the special phenolic compound 2,6-xylenol from the model coal tar, the liquid–liquid equilibrium data regarding the four mixtures (toluene + 2,6-xylenol + glycerol/ethylene glycol/1,4-butanediol/1,3-propanediol) were measured at 303.15 K under pressure 0.1 MPa. The separation performance of the selected solvents was assessed by distribution coefficient (D) and separation factor (S). The experimental and calculated results showed that glycerol and ethylene glycol were suitable solvents. Meanwhile, the reliability of the measured data was checked by the Hand and Othmer–Tobias methods. In addition, the NRTL and UNIQUAC thermodynamic models were adopted to correlate the experimental data with the calculated values of root-mean-square deviation (RMSD) and absolute average relative deviation (AARD) lower than 0.01. The consistency of the regressed binary interaction parameters was verified using a tool GUI-MATLAB.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Xiaoyuan Guo,Lan Qiu,Zhiwei Liang,Qihong Lu,Shanquan Wang,Hojae Shim
The coronavirus disease 2019 (COVID-19) pandemic has significantly increased the demand of disinfectant use. Chloroxylenol ( para -chloro- meta -xylenol, PCMX) as the major antimicrobial ingredient of disinfectant has been widely detected in water environments, with identified toxicity and potential risk. The assessment of PCMX in domestic wastewater of Macau Special Administrative Region (SAR) showed a positive correlation between PCMX concentration and population density. An indigenous PCMX degrader, identified as Rhodococcus sp. GG1, was isolated and found capable of completely degrading PCMX (50 mg L −1 ) within 36 h. The growth kinetics followed Haldane's inhibition model, with maximum specific growth rate, half-saturation constant, and inhibition constant of 0.38 h −1 , 7.64 mg L −1 , and 68.08 mg L −1 , respectively. The degradation performance was enhanced by optimizing culture conditions, while the presence of additional carbon source stimulated strain GG1 to alleviate inhibition from high concentrations of PCMX. In addition, strain GG1 showed good environmental adaptability, degrading PCMX efficiently in different environmental aqueous matrices. A potential degradation pathway was identified, with 2,6-dimethylhydroquinone as a major intermediate metabolite. Cytochrome P450 (CYP450) was found to play a key role in dechlorinating PCMX via hydroxylation and also catalyzed the hydroxylated dechlorination of other halo-phenolic contaminants through co-metabolism. This study characterizes an aerobic bacterial pure culture capable of degrading PCMX metabolically, which could be promising in effective bioremediation of PCMX-contaminated sites and in treatment of PCMX-containing waste streams.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2022
·
IF 3.378
Yang Shi,Guangya Yu,Xunqiu Wang
In recent years, dimethylphenol has played an important role in industrial production. The demand and application of dimethylphenol will increase greatly with the continuous advancement of the internationalization process. Solid-liquid equilibrium (SLE) is fundamental for the separation process design, the SLE data of dimethylphenol plays an important role in designing the melting and crystallization separation process. The SLE data of mixtures of 2,6-dimethylphenol (2,6-DMP), 3,5-dimethylphenol (3,5-DMP) and 2,5-dimethylphenol (2,5-DMP) were determined by differential scanning calorimetry (DSC). The crystallographic analysis of eutectic mixtures was analyzed by FTIR. The experimental results show that all the systems studied in this paper exhibit eutectic behavior. SLE data was correlated with Wilson and NRTL models and a satisfactory correlation was obtained. The study provided reliable and accurate data for separating the mixtures of 2,6-dimethylphenol, 3,5-dimethylphenol and 2,5-dimethylphenol. These SLE data are of great significance for the process development and process optimization of dimethylphenol.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Yang Qin,Xubin Zhang,Fumin Wang,Yongwang Li,Zhiwei Zhang,Zheng Wang,Qingzhao Liu,Bingxin Zhu,Junqi Zhang,Zhiqiang Qin,Tongxue Zhang,Hongyu Wang
Iron oxides are considered ideal catalysts for the ortho C-alkylation of phenol and methanol due to their favorable properties, so the simple synthesis of high-performance iron oxides will be of great significance. Different iron oxides catalysts are synthesized by direct thermal decomposition of five different iron precursors, and the effects of calcination temperature and atmosphere on their catalytic performance are analyzed. Characterization and experiments indicate that the total acidic content in the catalyst show a good correlation with its catalytic performance. The catalyst synthesized from iron citrate, with a high total acidic content, exhibits the best catalytic performance. The effects of reaction conditions are investigated. With the temperature increases, the conversion of phenol and the selectivity of 2,6-xylenol both show a “volcanic” trend. Unlike most previous reports, the molar ratio is positively correlated with catalytic performance, and the competitive adsorption of phenol and methanol is virtually negligible on the catalyst. Under the optimized reaction conditions, the conversion of phenol can achieve 99.4 % with a selectivity of 93.7 % to 2,6-xylenol. Finally, the causes of catalyst deactivation are analyzed and explained. The catalyst exhibits competitive catalytic performance and provides a novel approach for the efficient methylation of phenol.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jin Han,Taolei Qiu,Dan Wu,Yue Zhai,Michael R. Bockstaller,Xiaolin Zhang,Jianchao Zhao
Dimethyl phenol (DMP) oligomers are a side product of industrial poly(phenylethyl ether) (PPE) fabrication and significantly contribute to the environmental burden associated with PPE application. Here, a new process for the upcycling of waste-derived DMP into hyper-crosslinked porous polymer networks through Friedel-Crafts alkylation with p - dichloroxylene as an external crosslink agent is presented. The resulting hypercrosslinked porous polymers exhibited a maximum BET surface area of 740 m 2 /g and displayed and adsorption capacity of 5.9 wt% and 0.85 wt% towards CO 2 (at 1.0 bar, 298 K) and H 2 (at 1.0 bar, 77.3 K), respectively. Form stability of micro- and mesopores was attributed to the rigidity of the aromatic network structure. The results suggest new opportunities for the upcycling of DMP-waste components for applications such as carbon capture that could reduce the negative environmental const associated with the fabrication and application of PPE and related engineering polymers .
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21659-21667
·
IF 0
Pan Hanqing,Ma Qiao,Zhang Jiaxin,Hu Haodong,Dai Huiyu,Shi Yuyan,Lu Shuxian,Wang Jingwei
Chloroxylenol is a commonly used antimicrobial agent in antibacterial and disinfection products, which has been detected in various environments, such as wastewater treatment plants, rivers, seawater, and even drinking water, with concentrations ranging from ng/L to mg/L. However, the biodegradation of chloroxylenol received limited attention with only sporadic reports available so far. In this study, an efficient chloroxylenol-degrading consortium, which could degrade 20 mg/L chloroxylenol within two days, was obtained after five months of enrichment. Amplicon sequencing analysis revealed a decrease in the α-diversity (e.g., Shannon index and Inv_Simpson index) of the community during the domestication process. Microbial community dynamics were uncovered, with sequences affiliated to Achromobacter , Pseudomonas , and Rhodococcus identified as the most abundant taxonomic groups. From the consortium, five pure isolates were obtained; however, it was found that only one strain of Rhodococcus could degrade chloroxylenol. Strain Rhodococcus sp. DMU2021 could degrade chloroxylenol efficiently under the conditions of temperature 30–40 °C, and neutral/alkaline conditions. Chloroxylenol was toxic to strain DMU2021 and triggered both enzymatic and non-enzymatic antioxidant systems in response. This study provides novel insights into the biodegradation process of chloroxylenol, as well as valuable bioresources for bioremediation.
研究领域:
环境科学
·
微生物学
·
生物技术
·
生态毒理学
✓ 已验证
DOI
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yanlin Jiang,Yang Gao,Hangqing Xue,Yeqiang Lu,Lixin Xue
Polyamide (PA) based thin-film nanocomposite (TFN) membranes containing zeolitic imidazolate framework (ZIF) particles, denoted as PA (ZIF)-TFN membranes, were fabricated via interfacial polymerization (IP) between m-phenylenediamine (MPD) and 1,3,5-benzenetricarbonyl chloride (TMC). ZIF-8 particles were incorporated by direct dispersion into the oil-phase solution. Subsequently, the membranes were etched with xylenol orange disodium salt (XO) under acidic conditions to produce reverse osmosis (RO) membranes with improved water flux and salt rejection. These improvements were attributed to additional water-permeation channels and the sealing of non-selective interface defects. Solution pH, etching duration, and XO concentration also play roles in the structure and performance of the optimized RO membranes. After 12 h of etching, superior TFN/XO (12) RO membranes were obtained with rejection rate increased from (99.0% ± 0.2%) to (99.7% ± 0.1%), and water flux increased from (42.3 ± 0.9 L·m −2 ·h −1 ) to (65.1 ± 0.9 L·m −2 ·h −1 ). In addition, the membranes exhibited excellent boron removal rate, operational stability, and anti-pollution performance under conditions of 32,000 ppm NaCl and 55 bar.
研究领域:
膜科学
·
材料工程
·
化学工程
·
纳米技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-12
·
IF 5.479
Wang You,Huo Danqun,Wu Huixiang,Li Jaiwei,Zhang Qinghai,Deng Bo,Zhou Jing,Yang Mei,Hou Changjun
Carboxylic acids (CAs) have been reported as potential biomarkers of specific diseases or human body odors. A visual sensor array is described here that is based on indicator displacement assays (IDAs). The arrays were prepared by spotting solutions of the following metal complexes: Murexide-Ni(II), murexide-Cu(II), zincon-Zn(II) and xylenol orange-Cu(II), with the capability of discrimination of 15 carboxylic acids (CAs) and the quantitation of pyruvic acid (PA). Clear differences can be observed through distinctive difference maps obtained within 5 min by subtraction of red, green and blue (RGB) values of digital images after and before exposure to analytes. After an analysis of multidimensional data by pattern recognition algorithms including HCA, PCA and LDA, excellent classification specificity, and accuracy of >96% were obtained for all samples. The IDA array exhibited a linear range from 10 to 1500 μM with a theoretical detection limit of 3.5 μM towards PA. Recoveries of real samples varied from 84.8% to 114.3%. As-fabricated IDA sensor array showed an excellent selectivity among other organic interfering substances and a good batch to batch reproducibility, demonstrating its robustness. All these observations suggested that the IDA sensor array is one of the most promising paths for the discrimination of CAs.
Schematic diagram of indicator displacement assay (a), the procedure for acquisition of difference maps (b), and pattern recognitions for CAs (c). The method uses hierarchical cluster analysis (HCA), principal component analysis (PCA) and linear discriminant analysis (LDA)
研究领域:
分析化学
·
生物传感器
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Hu-Wei Lv,Hong-Liu Jiang,Fu-An He,Qing-Di Hu,Zhu-Rui Zhong,Yong-Yu Yang
A novel crosslinked cellulose-tetrafluoroterephthalonitrile-tannin (CETTA) polymer with the excellent adsorption performance for both cationic and anionic dyes was synthesized by a one-step reaction, and its structure was investigated by SEM, FTIR, TGA, XPS, and zeta potential measurement. It was found that the adsorption ability of the CETTA changed with the pH value of the dye solution because the electrostatic interaction played an important role in the dye adsorption process. The maximum adsorption capacities of the CETTA at 303 K for the cationic methylene blue (MB) and the anionic xylenol orange (XO) dye reached as high as 953 mg/g at pH = 10 and 232 mg/g at pH = 1, respectively. The adsorption behaviors of the CETTA for both the MB and the XO were not only spontaneous but also in accordance with the pseudo-secondary adsorption kinetic model and the linear Langmuir adsorption isotherm model. Additionally, the CETTA possessed the good reused ability for the dye adsorption.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）