Environments
·
2017
·Vol. 4
·期 2
·30
·
IF 0
Limei Huang,Yaqi Lu,Zhenyue Wu,Meishan Li,Shengchang Xiang,Xiuling Ma,Zhangjing Zhang
The environmental pollution of 2,4,6-tribromophenol (TBP) has attracted attention. Based on an urgent need for the better provision of clean water, in situ determination of TBP is of great importance. Here, a facile and effective approach for detecting TBP is developed, based on coupling molecular imprinting technique with electrodeposition of chitosan (CS) on the gold electrode. The TBP imprinting CS film was fabricated by using CS as functional material and TBP as template molecule. The experiments show that the morphologies and electrochemical properties of the imprinted film sensor was different from non-imprinted film electrode. The current of the imprinted film was linearly proportional to the TBP concentration, with a wide linear range of 1.0 × 10−7mol·L−1to 1.0 × 10−3mol·L−1. By selecting drop-coating method as a reference for controlled trials with the same functional material, the results illustrated that the electrodeposition enjoyed a widely linear range advantage.Keywords:2,4,6-tribromophenol;chitosan;molecular imprinting;electrodeposition
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
MONATSHEFTE FUR CHEMIE
·
2014
·Vol. 146
·期 3
·485-491
·
IF 1.347
Ma Xiuling,Wu Dan,Huang Limei,Wu Zhenyue,Xiang Shengchang,Chen Sheng
Abstract 2,4,6-Tribromophenol has been used as flame retardant and is a synthetic intermediate of the most important brominated flame retardants produced. In this work, a novel electrochemical sensor for determining 2,4,6-tribromophenol was fabricated by surface molecular imprinting technology, in which core–shell nanoparticles modified with (3-chloropropyl)trimethoxysilan and polyethylenimine were used as functional monomer, and 2,4,6-tribromophenol as template, ethylene glycol dimethacrylate as cross-linker. The electrochemical behavior the modified electrodes was investigated by electrochemical impedance spectroscopy and differential pulse voltammetry. The results showed that the imprinted electrode was significantly different from the non-imprinted electrode. The imprinted electrode had ascendant selective recognition ability, exhibited a low detection limit (1.51 × 10 −8 mol/dm 3 ) and good repeatability (RSD is 4.35 % for 5 times) for the detection of 2,4,6-tribromophenol. Graphical abstract
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2024
·
IF 3.2
Feng Lijuan,Yu Shuping,Jin Weimei,Xiao Changyan,Qiao Yan,Yang Guangfeng
AimsThis study aimed to ascertain the active substances in the hydroponic solution of Ulva (U.) fasciata (HSUF) and their effects on antibiotics resistance of pathogenic bacteria Vibrio alginolyticus (Va.) at environmental levels.Methods and ResultsAnalytical results of HSUF by solid-phase extraction and gas chromatography-mass spectrometry showed that HSUF contained rich active substances and dominated by 2,4,6-tribromophenol, acetal, mono (2-ethylhexyl) phthalate and 2- (4-hydroxybenzene) ethanol, etc. Thereinto, 2,4,6-tribromophenol had the lowest minimal inhibitory concentrations (MICs) of 64–128 μg mL−1 for Va. strains. The rich antibacterial substances of HSUF inhibited 47%-63% of isolated Va. strains. After 20 generations of subculture for Va. strains in three dilutes (1/2 (HT), 1/20 (MT) and 1/50 (LT)) of HSUF (20 g L−1), the resistance to streptomycin of Va. S1 and Va. M3 changed from intermediate resistance ability to susceptible level. The large promotion of reactive oxygen species was observed in different HSUF levels, but the biofilm formation of Va. S1 did not changed significantly. Transcriptome sequencing of Va. S1 demonstrated that antibiotic resistance gene lpxA was down-regulated at different HSUF levels.ConclusionsLive U. fasciata excreted a variety of active secondary metabolites (SMs) in HSUF, which exhibited strong inhibitory effects on three isolated Va. strains. HSUF changed the antibiotic resistance of Va. Strain, especially at a higher HSUF concentrations.
研究领域:
微生物学
·
环境科学
·
分子生物学
·
藻类学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 94
·期 3
·730-738
·
IF 2.587
Fan Yang,Jing Wang,Chen Gu,Ying Han,Guang-fei Liu,Hong Lu
BACKGROUND To accelerate direct interspecies electron transfer (DIET), magnetite is supplemented in anaerobic activated sludge (AS). However, it is usually reduced by dissimilatory iron reducing bacteria (DIRB). Therefore, an AS system supplemented with submicron magnetite particles (Fe 3 O 4 /AS) in an up-flow microaerobic sludge reactor was established, aiming to remove tribromophenol (TBP) efficiently and alleviate the magnetite dissolution. RESULTS Under microaerobic condition (DO, 0.6 mg L −1 ), the efficiencies of removal of COD, TBP, and methane production in Fe 3 O 4 /AS system were, respectively, 14.3%, 16.7%, and 27.2% higher than those of the AS system. Correspondingly, the dehydrogenase (DHA) and Coenzyme F 420 (CoF 420 ) activities were separately 1.38-fold and 1.41-fold enhanced. The enhanced biodegradation was via potential DIET, as visualized by microbes and magnetite particles, Geobacter enrichment and c -type cytochromes ( c -Cyts) increasement. Notably, magnetite majorly maintained an intact structure. In effluents, the Fe(II) concentrations were maintained at less than 10 mg L −1 under microaerobic conditions, far less than the amount under anaerobic conditions, which might be due to the in situ redox cycle of Fe(III)-reduction and Fe(II)-reoxidation. CONCLUSION Significant enhancements in removal efficiencies of TBP and COD and methanogenesis were demonstrated in a Fe 3 O 4 /AS system, indicating intrinsically faster electron transfer via electrical conduction. Putative oxidation of dissolved Fe(II) in situ occurred in microaerobic environments, which could protect magnetite in the system without extra magnetite supplementation. © 2018 Society of Chemical Industry
研究领域:
环境工程
·
生物技术
·
微生物学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2020
·Vol. 43
·期 5
·851-861
·
IF 2.419
Ma Shu,Wang Jing,Han Ying,Yang Fan,Gu Chen,Wang Fengbo
Conductive magnetite (Fe 3 O 4 ) has been applied into some anaerobic bioprocesses to accelerate direct interspecies electron transfer (DIET), however, Fe 3 O 4 is usually dissolved by iron-reducing bacteria under anaerobic conditions, resulting in the loss of magnetite. Therefore, submicron magnetite particles were added to the sequencing batch reactor (SBR) to build a Fe 3 O 4 /SBR system, which could alleviate magnetite dissolution and simultaneously remove tribromophenol (TBP) effectively. The average removal efficiencies of chemical oxygen demand (COD) and TBP in Fe 3 O 4 /SBR system were 81% and 91%, respectively, which were 51% and 18% higher than those of the control group without Fe 3 O 4 (SBR system). The enhanced TBP biodegradation was likely related to potential DIET, which was supported by the scanning electron microscopy (SEM) analysis, the increase of dehydrogenase and heme c (fivefold and 1.7-fold), and the enrichment of iron-redoxing bacteria ( Geobacter and Thiobacillus ). Furthermore, magnetite mainly remained intact in structure as indicated by X-ray diffraction (XRD), which might be ascribed to in situ iron redox cycle and magnetite biosynthesis via Magnetospirillum . Notably, the content of hydrogen peroxide (H 2 O 2 ) and hydroxyl radical (⋅OH) in Fe 3 O 4 /SBR system was 4–5 times higher than that of SBR system. These findings could provide insights into the development of cost-effective strategy for the removal of refractory organic pollutants.
研究领域:
环境工程
·
生物技术
·
废水处理
✓ 已验证
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）