Journal of Environmental Sciences
·
2016
·
IF 2.208
Xianze Wang,Zhongmou Liu,Chi Wang,Zhian Ying,Wei Fan,Wu Yang
The presence of mutagenic and carcinogenic nitrosamines in water is of great concern. In this study, seven nitrosamines including N-nitrosodimethylamine (NDMA), N-nitrosodiethylamine (NDEA), N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPyr), N-nitrosopiperidine (NPip), N-nitrosodi-n-propylamine (NDPA), and N-nitrosodi-n-butyl-amine (NDBA) were investigated in river water and ground water samples collected from 5 representative cities (Jilin, Songyuan, Harbin, Jiamusi and Tongjiang) along the Songhua River. The total concentrations of nitrosamines in ground water were n.d. (not detected) to 60.8 ng/L, NDMA was the most frequently detected nitrosamines in ground water, followed by NDEA and NPip. Relatively high detected frequency and concentrations of NDMA were also observed in river water samples, and the total nitrosamines' concentration at midstream is always higher than that at upstream and downstream. After 24 hr chlorination, concentration of NDMA, NDBA was obviously increased but NDEA was reduced. Furthermore, UV 254 showed a better relationship with NDMA-FP rather than dissolved organic carbon (DOC), NH 4 -N, and TDN.
研究领域:
环境科学
·
公共卫生
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Xiangyu Wang,Wei Zhang,Xu Zhang,Lang Ran,Quanlin Zhao,Binze Zou,Lincheng Zhou,Zhengfang Ye
Chloromethyl styrene-divinylbenzene (PS–Cl) resin was usually chemically modified for the adsorption of heavy metal ions in wastewater. However, this work will introduce a new application of resin for catalytic degradation of antibiotics. The core-shell PS-NH 2 @MIL-53(Fe) catalyst was fabricated by simple two-step route including chemical synthesis and step-by-step self-assembly strategy. The catalysts exhibited excellent catalytic activity toward the degradation of tetracycline (TC) in the presence of H 2 O 2 , with a degradation efficiency and degradation rate constant ( k ) of 94.15% and 0.05643 min −1 within initial 20 min, respectively. Moreover, the mineralization and stability of PS-NH 2 @MIL-53(Fe) both showed excellent performance. The advantage of PS-NH 2 @MIL-53(Fe) is that the degradation efficiency of TC could be modulated by the number of self-assembly. Additionally, we utilized the Yellow River water to explore the effect of the catalyst for TC removal in the actual wastewater treatment . Meanwhile, several possible catalytic degradation pathways were analyzed on the basis of using HPLC-MS to detect the intermediates generated in the process of catalytic degradation, and a potential catalytic degradation mechanism was proposed. In brief, the new application of amination resin modified by MIL-53(Fe) in catalytic degradation of TC shows promising prospect, especially in the field of environmental remediation.
研究领域:
环境科学
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催化化学
·
废水处理
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 4
·047505
·
IF 3.3
Moustafa Zahran,Suzan Mohammed,Magdy A.-H. Zahran,Magdi Abdel Azzem
Congo red (CR), a synthetic azo dye, is known for its high toxicity and potential to bioaccumulate in the food chain. Exposure to CR-contaminated water can lead to various health issues, including cancer, underscoring the need for effective quantification and treatment methods. While reliable, traditional chromatographic and spectroscopic techniques are often complex, require toxic solvents, and may not be suitable for rapid or on-site analysis. Herein, we report a replacement tool for quantifying CR in water samples using an electrochemical sensor modified with biosynthesized chitosan-capped silver nanoparticles (AgNPs). AgNP identification was accomplished using ultraviolet-visible spectroscopy and square wave voltammetry (SWV), which showed AgNP characteristic peaks at 438 nm and 0.06 V, respectively. A transmission electron microscope confirmed the spherical shape of AgNPs and their average size (30 nm). The electrocatalytic activity of AgNPs towards CR was also approved using cyclic voltammetry, SWV, and impedance spectroscopy. Thus, the SWVs of different concentrations of CR were used to obtain the calibration curve, showing limits of detection and quantification of 0.017 and 0.056 μM, respectively. Additionally, the interferences and real sample studies showed that the chitosan-capped AgNPs sensor is suitable for quantifying CR in river water samples with high selectivity.
研究领域:
环境科学
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纳米生物学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Zhuqiu Sun,Bowen Pang,Jinying Xi,Hong-Ying Hu
Eight species of mixotrophic sulfide oxidizing bacteria (SOB) were isolated from activated sludge and identified using 16S rRNA sequence analysis. The effects of organic substances, dissolved oxygen (DO) and nitrate on sulfide oxidation and bacterial growth were studied in this work. The results showed that Paracoccus sp . (N1), Pseudomonas sp. (N2) and Pseudomonas sp. (S4) have strong adaptability to environments with low DO and high concentrations of organic substance. An SOB additive was optimized in artificial, odorous water. The optimized SOB additive is a blend of 80% N1 and 20% N2 bacteria solution with absorbance equal to 0.5 at a wavelength of 600 nm (OD 600 ), and the optimal dose of the additive is 20 ml/L. Oxidation-reduction potential (ORP), ammonia-nitrogen (NH 3 -N) and released H 2 S in an odorous river were measured with and without SOB additive, and the results indicated that the optimized SOB additive has excellent performance for odorous river bioremediation.
研究领域:
环境微生物学
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水处理工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2020
·
IF 5.715
Hualin Jiang,Lei Tian,Pinghua Chen,Yingchen Bai,Xueqin Li,Hongying Shu,Xubiao Luo
Co 3 O 4 @rGO were facilely prepared by template free self-assemble in this study. The morphology of Co 3 O 4 @rGO was actiniaria-like core-shell structural nanocomposites. The formation mechanism of Co 3 O 4 @rGO core-shell nanocomposite was discussed according to its significant time-dependent morphology evolution course. To evaluate the application potential of Co 3 O 4 @rGO, its adsorption performance toward highly toxic antimony ions were studied. The Co 3 O 4 @rGO nanocomposite exhibit high anti-interference ability and high adsorption ability. The maximum adsorption capacities towards Sb(III) and Sb(V) are 151.04 and 165.51 mg/g, respectively. River water samples containing antimony violating the limit were used to evaluate the practical application of Co 3 O 4 @rGO, and high performance was achieved. The EU and China limits for antimony in drinking water can be met by using mesoporous Co 3 O 4 @rGO treating the actual river water samples with original antimony concentration lower than 50 μg/L. Adsorption isotherm, adsorption kinetics, pH and co-existing ions effects were also studied in details. The results indicate that mesoporous Co 3 O 4 @rGO is an excellent adsorbent for antimony removal. Mesoporous Co 3 O 4 @rGO nanocomposite is a potential candidate for antimony removal from waste water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 2
·292
·
IF 3.426
Yuan Tian,Xilan Feng,Yuping Zhang,Quan Yu,Xiaohao Wang,Mengkui Tian
Ionic liquids found a wide application in catalysis and extraction due to their unique properties. Herein, ethylene glycol dimethacrylate as the cross-linker and 1-vinyl-3- butylimidazolium tetrafluoroborate as functional monomer via thermally initiated free-radical polymerization was prepared as a novel copolymer solid phase micro-extraction (SPME) coating. A surface modified stainless-steel wire was implemented as the substrate. Factors affecting the extraction performances of the copolymer, including the molar ratio of monomers to cross-linkers, the amount of porogen agent, and polymerization time were evaluated and optimized. To evaluate the extraction performance, five commonly seen polycyclic aromatic hydrocarbons (PAHs) were taken as the analytical targets. The potential factors affecting extraction efficiency were optimized. The as-prepared SPME device, coupled with gas chromatography, was successfully applied for the determination of PAHs in water samples. The wide linear range, low detection limit, good reproducibility, selectivity, and excellent thermal stability indicate the promising application of the newly developed SPME fiber in environmental monitoring as well as in other samples having complex matrices.Keywords:solid phase micro-extraction;polyionic liquids;cross-linker;in-mold coating;polycyclic aromatic hydrocarbons;river water
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 29
·3256-3263
·
IF 2.896
Hongmei Liu,Shihao Dang,Gu A,Baogui Ye
For sorbents, good magnetic properties and rich interactions with targets are important ways to improve the efficiency of magnetic solid-phase extraction (MSPE). The magnetic MOF-101 derivative (MD) was obtained by heat-treating MOF-101 at different temperatures. After a series of characterizations, it was found that MD-350 had the best magnetic properties and retained more functional groups of the original MOF-101, and had better extraction efficiency as compared to MD obtained under other treatment temperatures for the MSPE of four non-steroidal anti-inflammatory drugs (NSAIDs) in water samples, coupled with high-performance liquid chromatography (HPLC). The remaining functional groups of MD-350 can produce more interactions with NSAIDs, such as hydrogen bonding, π–π conjugation, and coordination interactions; good magnetic properties facilitate the separation of the sorbent and the solution. These advantages indicate that the established extraction method demonstrated satisfactory extraction performance: an excellent recovery rate (96.73–100.61%) with a short extraction time (15 min), a wide linear range (4–400 μg L−1) with a determination coefficient of 0.9975–0.9993, a low LOD of 0.2–0.5 μg L−1 and up to 12 times service-life without the loss of the recovery rate. Satisfactory results were also obtained in extracting NSAIDs from Yellow River. All these results indicate that MD-350 prepared under mild conditions has potential as an MSPE sorbent to detect and remove NSAIDs from environmental waters with high efficiency and long service life.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Xi Wu,Zhiwei Chen,Yibo Lv,Youwen Zhang,Shiming Xu,Xiaojing Zhu
In order to simultaneously produce hydrogen and reduce the salinity of concentrated wastewater (brine) from the desalination plant , a lab-scale reverse electrodialysis (RED) hydrogen production system driven by salinity gradient energy is designed and its performance is experimentally studied. The energy conversion of the RED system is found affected by the ionic compositions of the desalination concentrated brine (DCB). The effects of ionic types (multivalent cation, anion, and phosphorous salt) and ionic concentration (from 0.01 to 0.05 M) and pH of DCB (from 5 to 11) on the hydrogen production are investigated. The results show that the existence of multivalent ions in brine significantly degrade the capability of output voltage and hydrogen production of the RED system. Compared to the control group, the additions of 0.05 mol·L −1 NaBr and 0.05 mol·L −1 FeCl 3 into the simulated brines lead to the output voltage drops of 29 % and 60 %, respectively, when the current is maintained at 0.2A. Additionally, the experiment yields an MHP of 128 mL·h −1 at the current of 0.3A. Generally, the performances of the RED stack can be improved as increasing the pH of an acidic DCB, but declined as the increasing the pH of an alkaline DCB.
研究领域:
环境科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xuejiao Wang,Jiayi Dai,Xupeng Zhu,Xueyan Liu,Yufeng Tao,Erjin Zhang,Xudong Ren
The presence of hazardous substance in river water poses a severe threat to both the ecological environment and human health. Therefore, designing and preparing highly sensitive SERS platform for monitoring the hazardous substance is of great significance. Herein, the Ag nanoflowers (NFs)@ZIF-8 core-shell nanocomposite was synthesized and utilized as SERS substrate. Using crystal violet as model molecule, this substrate achieved a detection limit of 10 −10 M and superior uniformity with relative standard deviation of less than 15 %, and the enhancement factor (EF) for crystal violet was calculated about 4.37×10 6 . Besides, the SERS signal only showed a slight attenuation after 3 months storage. As a demonstration, the SERS platform achieved sensitive detection of two hazardous substances thiram and methylene blue with detection limits of 10 −7 M and 10 −8 M. And the recoveries of SERS detection for thiram and methylene blue in river water were between 70 % and 182 %. The electromagnetic enhancement provided by Ag NFs and the enriching effect of ZIF-8 shell collectively contribute to the excellent performance of the Ag NFs@ZIF-8 SERS platform. This work delivers a promising strategy for constructing hybrid SERS platform for highly sensitive detection.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
·
2015
·
IF 2.321
Yao Chen,Zeng-Ping Chen,Jing-Wen Jin,Ru-Qin Yu
In this contribution, surface-enhanced Raman spectroscopy (SERS) coupled with an advanced chemometric method-multiplicative effects model (MEM SERS ) has been applied to quantitative analysis of ametryn in water samples of the Xiangjiang River (Changsha, China). The adoption of MEM SERS calibration model was to eliminate the detrimental effects caused by variations in the physical properties of enhancing substrates, the intensity and alignment/focusing of laser excitation source. Experimental results showed that the combination of SERS with MEM SERS can provide quite precise concentration predictions for ametryn in water samples of the Xiangjiang River with an average relative prediction error of about 4.8%. The combination of SERS with MEM SERS can compete with LC-MS/MS in terms of precision and accuracy of quantitative results. The limit of quantification was about 0.09 μM. More importantly, no laborious reference methods (e.g., HPLC) were needed to build the MEM SERS calibration model, since the MEM SERS calibration model built on the calibration samples prepared with ultrapure water could provide satisfactory quantification results for the test samples prepared with water collected from the Xiangjiang River. Therefore, it is reasonable to expect that SERS in combination with MEM SERS model would become a competitive alternative in routine quantitative analysis of ametryn in environmental water samples.
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 ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Tao Zhang,Wanling Cai,Zuliang Chen
Bio-nanocomposites have attracted increasing research attention because they are able to integrate bio- and nano-related functions, and subsequently demonstrate potentially beneficial environmental applications. Here, a functional bionanomaterial based on Burkholderia cepacian (FZ) immobilized on GO/ZIF-8 was developed and used to remove malachite green (MG), with functions based on both biodegradation and adsorption. XRD and FTIR results showed that in situ production of GO/ZIF-8 by combining Zn 2+ in ZIF-8 with the carboxyl group on the GO surface, led to FZ immobilized in GO/ZIF-8 through covalent bonding. Zeta analysis showed that the surface of FZ and GO/ZIF-8 had different charges under pH = 9.12, suggesting immobilization also occurred via electrostatic action. BET results confirmed that the specific surface area of GO/ZIF-8 was much larger than that of GO and ZIF-8, but the reduced specific surface area of FZ@GO/ZIF-8 could be due to FZ loading on its surface. The efficiency of FZ@GO/ZIF-8 in the removal of MG reached 99% and furthermore retained good stability after five cycles. The efficiency in removing multiple ions in river water reached more than 80%, which is evidence strongly suggesting that FZ@GO/ZIF-8 is an environmental bionanomaterial with effective application potential.
研究领域:
环境科学
·
纳米技术
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 17
·1986-1992
·
IF 2.073
Shiwei Liu,Tongshun Wu,Fenghua Li,Qixian Zhang,Xiandui Dong,Li Niu
In this study, a low-cost disposable graphene sensor was fabricated for detecting heavy metals such as Cd2+, Pb2+ and Cu2+ by the anodic stripping voltammetry method (ASV). Vacuum compacted graphene films were used as the three electrodes, and they showed excellent conductivity and low noise signals. A big advantage was the simple fabrication process of graphene films without any binder. Furthermore, a ferrocene-based internal reference was introduced in the working electrode. The analytes were recognized by the relative distances of the stripping potential peaks between the working electrode and internal reference electrode. Finally, the all-graphene-based sensor was successfully built for the electrochemical analysis and then applied for determination of heavy metals in real river-water samples.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）