CHEMOSPHERE
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2020
·
IF 5.778
Jing-qiu Hua,Rui Zhang,Rong-ping Chen,Guang-xiang Liu,Ke Yin,Lei Yu
A highly efficient bioflocculant, i . e ., Na-Bsp was successfully prepared by using a tolerant strain- Bacillus sp. under high-salt condition without sterilization. Salt-containing medium was not infected by other strains throughout the whole incubation period in 168 h. The as-prepared Na-Bsp was found to be cation-dependent, exhibiting high flocculant efficiency (FE) i.e., 97.69 ± 0.61%, towards kaolin particles by aid of Fe 3+ . High FE values were well maintained under a wide pH range and/or boiled water treatment , likely because of the main constituent of polysaccharide . The presence of hydroxyl, carboxyl, and amine groups on the bioflocculant surface were possibly responsible for strong interactions with heavy metals. The adsorption capacities of Pb 2+ , Cu 2+ and Cr 6+ were 1000.0, 434.8 and 384.6 mg g −1 , respectively. The changing of structure and configuration of bioflocculant during the metal adsorption were explored by the scanning electron microscope with electron energy loss spectroscopy and three-dimensional excitation-emission fluorescence spectrometry . This study provided a novel production method, whereby the conventional sterilization could be avoided, which is of great environmental significance for steam-saving. Furthermore, the as-prepared Na-Bsp exhibited high adsorption capacities toward heavy metals, which sheds lights on its potential usage as an alternative adsorbent.
研究领域:
环境生物学
·
微生物学
·
污染控制
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DOI
PubMed
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2017
·
IF 2.962
Yu Jiang,Tao Deng,Yu Shang,Kai Yang,Hongyu Wang
Phenol-containing industrial wastewater disposal has received much attention in recent years due to its toxicity and slow biodegradation. In this work, the isolated fungal strain Debaryomyces sp. was entrapped into Ca-alginate beads with nanoscale Fe 3 O 4 to improve phenol biodegradation ability. Freely suspended cells as well as Ca-alginate immobilized cells without nanoscale particles were also prepared. Phenol removal by free cells and two kinds of Ca-alginate beads was evaluated with different initial phenol concentrations, temperatures, and salinities . The phenol biodegradation kinetics and optimal dosage of nano-Fe 3 O 4 during the preparation of Ca-alginate beads were also determined. The results showed that immobilized Debaryomyces strain had better biodegradation performance than free cells under harsh conditions. Phenol removal rates were highest when using magnetically immobilized cells, followed by nonmagnetically cells. More than 99.9% of phenol was degraded within 80 h by immobilized cells with nano-Fe 3 O 4 when initial phenol concentration was over 900 mg L −1 while the phenol removal efficiencies of free cell and immobilized cells without nano-Fe 3 O 4 were 34.5% and 81.3%, respectively during the same periods of time. The reusability tests were carried out and the results indicated good stability of immobilized cells in saline environments, which was practical in actual industrial wastewater treatment .
研究领域:
环境科学
·
微生物学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Shuanghui Jia,Yilan Wu,Hongling Zhou,Hangjun Yan,Yang Liao,Hui Mao
The degradation of antibiotics in industrial wastewater with high salt concentrations is a critical challenge for the treatment of pharmaceutical wastewater. We developed a salt-tolerant catalyst by anchoring FeNPs in an amphiphilic tannin foam, enabling high-performance catalytic degradation of tetracycline in high salt concentrations. The high-salt tolerant catalyst effectively stabilized and dispersed FeNPs due to abundant polyphenol hydroxyls and the steric hindrance of the aromatic backbone. The amphiphilic nature of the tannin foam facilitated the effective adsorption of tetracycline, even under high salt condition of 1.0 mol/L NaCl. The salt-tolerant catalyst was effective for tetracycline, chlorotetracycline, and minocycline degradation, with significantly alleviated toxicity observed in degradation intermediates. The catalyst was highly recyclable, with a 6th cycle removal rate of 86.3%.
研究领域:
环境科学
·
生物化学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2018
·
IF 7.051
Rui Luo,Miaoqing Li,Chaohai Wang,Ming Zhang,Muhammad Abdul Nasir Khan,Xiuyun Sun,Jinyou Shen,Weiqing Han,Lianjun Wang,Jiansheng Li
The degradation of organic contaminants under high salinity condition is still a challenge for environmental remediation due to the inhibiting effect resulted from the side reactions between radicals and anions. Here, we demonstrate the non-radical oxidation process via peroxymonosulfate (PMS) activation by metal-free carbon catalyst for efficiently decomposing bisphenol A (BPA) in saline water. The nitrogen-doped graphitic carbon (NGC700) exhibits excellent catalytic activity for depredating BPA at acid and neutral pH. Based on the scavenger experiments and electron paramagnetic resonance (EPR) analyses, the mechanism of catalytic oxidation was elucidated as the non-radical pathway, and singlet oxygen was identified as the primary reactive species. Experiments on the influence of anions (5–500 mM) further show that the inhibiting effect was overcame due to the non-radical process. Interestingly, Cl − markedly facilitated the catalytic performance by generating HOCl in the catalytic process. The results highlight leveraging the non-radical pathway dominated by singlet oxygen to conquer the inhibitory effect of anions in NGC700/PMS system, which represents a crucial step towards environmental remediation under high salinity condition.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xin Guo,Hao Zhang,Yiyuan Yao,Chengming Xiao,Xin Yan,Ke Chen,Junwen Qi,Yujun Zhou,Zhigao Zhu,Xiuyun Sun,Jiansheng Li
Integrating the merits of the substrate and active sites with the water matrix is of significant importance to design novel catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes. A sandwich-like heterostructure catalyst (MCoO@Co-N-C) were fabricated via anchoring zero-dimensional metal-organic frameworks (MOFs)-derived CoO nanoparticles on two-dimensional Ti 3 C 2 T x MXene nanosheets . Benefiting from the distinctive structure, the resultant catalysts achieved excellent decontamination performance under high salinity conditions (200 mM). Nearly 100% efficiency of bisphenol A (BPA) was degraded within 10 min only using 0.05 g L −1 catalyst and 0.1 g L −1 PMS, with exceptional high turnover frequency (TOF) value (8.64 min −1 ) which was 22.5 times higher than that of MOFs derived catalysts without MXene. A mediated-electron transfer mechanism is found to be conducive to the oxidation of BPA. This work provides a new approach to novel catalysts designed for removing trace organic contaminants (TrOCs) in saline water.
研究领域:
环境科学
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催化材料
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水处理技术
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Hongwei Ren,Meiyu Li,Yize Liu,Tengda Zhao,Ruoyao Zhang,Erhong Duan
Trace Co 2+ , when present in large quantities, is harmful to the environment and therefore cannot be ignored. Inductively coupled plasma mass spectrometry (ICP-MS) is a standard method used to detect metal ions , however, detecting trace Co 2+ under high saline conditions can be challenging. Similarly, existing Co 2+ treatment methods are prone to secondary pollution and have high energy consumption. Therefore, it is necessary to find an efficient and non-polluting method for Co 2+ detection and treatment. This study successfully synthesized nitrogen-rich carbon quantum dots (N-CQDs) based on natural deep eutectic solvents (NADES) using a one-step solvothermal method. The prepared N-CQDs exhibited excellent fluorescence and high salt tolerance. The simultaneous detection and treatment of trace Co 2+ in water under high salinity conditions were achieved for the first time. The response of the N-CQDs to Co 2+ under saline condition was linear in the range of 5–250 μM with a limit of detection (LOD) of 1.2269 μM. Feasibility of practical application was assessed by quantitative detection of Co 2+ in real water samples. Furthermore, the N-CQDs can treat Co 2+ , and the removal rate was 99.98%.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
·
2024
·
IF 4.1
Hongming Huang,Huang Yang,Shunhang Feng,Xiaoyan Zhang,Chu Chen,Hongyu Yan,Rui Li,Mengxin Liu,Juan Lin,Yancheng Wen,Feifei She
The burgeoning emergence of drug-resistant Helicobacter pylori strains poses a significant challenge to the clinical success of eradication therapies and is primarily attributed to mutations within drug-targeting genes that lead to antibiotic resistance. This study investigated the effect of high salt conditions on the occurrence of drug-resistance mutations in H. pylori. We found that high salt condition significantly amplifies the frequency of drug resistance mutations in H. pylori. This can be chiefly attributed to our discovery indicating that high salt concentration results in elevated reactive oxygen species (ROS) levels, initiating DNA damage within H. pylori. Mechanistically, high salt condition suppresses lipopolysaccharide (LPS) synthesis gene expression, inducing alterations in the LPS structure and escalating outer membrane permeability. This disruption of LPS synthesis attenuates the expression and activity of SodB, facilitates increased ROS levels, and consequently increases the drug resistance mutation frequency. Impairing LPS synthesis engenders a reduction in intracellular iron levels, leading to diminished holo-Fur activity and increased apo-Fur activity, which represses the expression of SodB directly. Our findings suggest a correlation between high salt intake and the emergence of drug resistance in the human pathogen H. pylori, implying that dietary choices affect the risk of emergence of antimicrobial resistance.
研究领域:
微生物学
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分子生物学
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传染病学
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药理学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
HeLang Huang,CaiYun Xie,ZiYuan Xia,ZhaoYong Sun,YaTing Chen,Min Gou,YueQin Tang,HengLin Cui,XiaoLei Wu
Haloarchaea with the capacity to degrade alkanes is promising to deal with petroleum pollution in hypersaline environments. However, only a limited number of haloarchaeal species are investigated, and their pathway and mechanism for alkane degradation remain unclear. In this study, Halogranum rubrum RO2-11, a haloarchaeal strain, verified the ability to degrade kerosene and hexadecane in 184 g/L NaCl, with a 53% degradation rate after 9 and 4 days, respectively. Genome sequencing and gene annotation indicated that strain RO2-11 possesses a complete potential alkane-degrading pathway, of which alkane hydroxylases may include CYP450, AlmA, and LadA. Transcriptome and metabolome analyses revealed that the upregulation of related genes in TCA cycle, lysine biosynthesis, and acetylation may help improve hexadecane degradation. Additionally, an alternative degrading pathway of hexadecane based on dual-terminal β -oxidation may occur in strain RO2-11. It is likely to be the first report of alkane degradation by the genus Halogranum , which may be helpful for applications of oil-pollution bioremediation under high-salt conditions.
研究领域:
微生物学
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环境科学
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基因组学
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转录组学
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代谢组学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Mengyang Song,Yuze Li,Wenbo Ma,Junyu Chen,Zongxiu Nie
Pulsed nanoelectrospray ionization (nanoESI) mass spectrometry has been proven to have several merits compared to its direct current (DC) counterparts, such as high sensitivity, high matrix tolerance, and low electrochemical interference. However, the reliance on external devices like signal generators and power amplifiers limits the technology’s suitability for on-site use. Here, we developed a frequency-amplitude tunable hand-held pulsed high-voltage supply specifically designed for nanoESI. This portable detection system eliminates reliance on bulky ancillary equipment of conventional approaches, with a total mass of 185 g and an ergonomic hand-held configuration. Through systematic modulation of frequency (10–50 kHz) and voltage (1.5–6 kV), the device achieves optimal detection performance across diverse analytical standards and complex matrixes, including serum and cellular samples. The pulse-induced self-cleaning effect prevented nozzle clogging while maintaining functionality under high-salt conditions (855 mM NaCl). To demonstrate clinical applicability, we analyzed 198 serum specimens (100 from atherosclerotic cardiovascular disease patients (ASCVD) and 98 age-matched controls), identifying statistically significant dysregulation of multiple metabolites in the ASCVD cohort and achieving a diagnostic accuracy of 85%. Field deployment trials using portable mass spectrometers further validated the system’s potential for rapid on-site diagnostics, establishing a new paradigm for point-of-care analytical technology.
研究领域:
分析化学
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生物分析化学
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代谢组学
·
生物医学工程
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临床诊断
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质谱分析技术
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Yang Li,Cai Tianming,Ding Dahu,Cai Tianjin,Jiang Canlan,Li Hua,Yang Qian,Chen Liwei
2-hydroxy-1,4 naphthoquinone (lawsone) is widely used and induces environmental pollutions during its production and application. In the present study, a lawsone-degrading bacterium strain, LH-3 was successfully isolated from the activated sludge. Based on the 16S rRNA gene analysis, the strain LH-3 phylogenetically belonged to the Pseudomonas taiwanensis . It could degrade 200 mg L −1 lawsone completely in 9 h with an inoculum quantity of 1% (v/v). The effects of environmental conditions on the degradation process and the degradation pathway were systematically investigated. LH-3 could maintain its high degradation efficiency under high salt condition. The identified intermediates of salicylic acid, 2-hydroxy-4-oxo-chroman-2-carboxylic acid, and catechol elucidated the potential degradation pathway. Furthermore, the immobilized LH-3 strain cells prepared with alginate gel and biochar performed excellent stability in nine successive degradation runs. It could sucessfully survive in laboratory scale sequencing batch reactor and become to be the dominant species. This study clearly revealed that LH-3 could serve as an attractive candidate for the microbial remediation of lawsone-containing wastewater.
研究领域:
环境微生物学
·
生物修复
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废水处理
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）