TALANTA
·
2018
·
IF 4.244
Zhongmin Feng,Ni Wang,Manli He,Lan Yang,Yun Wang,Ting Sun
A new diffusive gradients in thin films (DGT) technique with a micro-sized biochar-zeolite-zirconium oxide mixed binding phase is described for simultaneous sampling of dissolved orthophosphate and ammonium in freshwaters. The performance of mixed binding layer (MBL) DGT technique was characterized by evaluation of the following parameters: (1) the adsorption efficiency of phosphate and ammonium by the mixed binding phase, (2) the elution efficiency, (3) the time-series accumulation, and (4) the influences of pH, coexisting cations and DOC on DGT uptake. The mixed binding phase had high uptake for both phosphate and ammonium. The accumulated analyte mass increased linearly with time over 48 h ( Δ g = 1.3 mm) and 84 h ( Δ g = 1.9 mm), respectively. Simultaneous sampling of phosphate and ammonium using MBL-DGT was consistent over the 10–80 mg C L −1 DOC concentration range and the 3–8 pH range for a 24 h deployment. The coexisting cations (Na + , K + , Mg 2+ , and Ca 2+ ) were found to compete with the ammonium accumulation by MBL-DGT, but ammonium accumulation was consistent over concentration ranges typically found in most freshwaters (up to 0.01 mol L −1 Na + , 0.001 mol L −1 K + , 0.01 mol L −1 Mg 2+ , 0.03 mol L −1 Ca 2+ ). The MBL-DGT method also performed predictably in natural freshwaters containing different concentrations of metal ions and dissolved organic carbon. The results of this project have demonstrated that this new DGT method can offer a more cost-efficient method for simultaneously determining time-weighted average concentrations of ammonium and dissolved orthophosphate in most freshwaters, but inefficiently in high salinity waters because of its extremely high concentration of competing cations.
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
Water
·
2017
·Vol. 9
·期 5
·326
·
IF 1.832
Ting Zhang,Jian He,Xingzhang Luo
Due to the fact that not all eutrophic lakes have cyanobacteria blooms, we hypothesized Fe may be another important limiting factor which regulates cyanobacteria bloom formation. We tested the hypothesis by batch cultures of bloom-forming Cyanobacterium,Microcystis aeruginosawith different ethylenediaminetetraacetic acid (EDTA)-Fe concentrations (0.5–6.0 mg/L), three levels of initial biomass, and excessive N and P (N = 4.2 mg/L, P = 0.186 mg/L) to simulate dynamically a cyanobacteria bloom in eutrophic conditions. The effect of EDTA and Fe uptake kinetics byM. aeruginosawere also examined. Results showedM. aeruginosagrowth rate positively correlated with EDTA-Fe concentration and negatively correlated with biomass. Maximal biomass ofM. aeruginosawas determined by Fe availability and initial biomass. EDTA could decrease both Fe availability and toxicity. Based on experimental results, a conceptual model of how Fe availability regulates cyanobacterial biomass in eutrophic lakes was developed. This study demonstrated bioavailable Fe is a potential limiting factor in eutrophic lakes that should be included in eutrophication management strategies.Keywords:Microcystis;eutrophication control;freshwater;Fe availability
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 47
·67203-67213
·
IF 4.223
Xu Xia,Zhang Ling,Xue Yingang,Gao Yu,Wang Liping,Peng Mingguo,Jiang Shanqing,Zhang Qiuya
Much more attention has been poured into microplastic pollution in freshwater systems recently. In the present study, the pollution of microplastics (MPs) in surface water and freshwater fish (crucian carp, etc.) were investigated from Gehu Lake, which is the second largest lake in southern Jiangsu after Taihu Lake. The result manifested that the average abundance of MPs was respectively 6.33±2.67 n/L for surface water and 10.7 items per individual for freshwater fish. The distribution of MPs in Gehu Lake varied from place to place, with the highest abundance of MPs was observed in the two estuaries of the eastern part of the lake. It was speculated that topographical factors and human factors were the main factors affecting the abundance and distribution of MPs. Transparent fibers were the main type of MPs in water samples, accounting for 69.70% of all detected particles. Meanwhile, most of the MPs ingested by freshwater fish were fibers, and the main colors were transparent and blue. In addition, the dominant size of the MPs was between 0.1 to 0.5 mm in water and fish samples. Moreover, PES, man-made fiber, and PP were the dominant polymer types in the surface water and fish samples. The results of this investigation can provide basic data for the research and management of MPs in freshwater systems.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 4
·955
·
IF 3.426
Hongzhong Tan,Jincheng Mao,Wenlong Zhang,Bo Yang,Xiaojiang Yang,Yang Zhang,Chong Lin,Jianfa Feng,Hao Zhang
Three kinds of drag reducer were synthesized by inverse emulsion polymerization and named PHWAM-1, PHWAM-2, and PHWAM-3. Drag reduction (DR) tests showed that the three drag reducers have different DR characteristics in fresh water and various saline waters because of their different types of hydrophobic monomers. PHWAM-1, without hydrophobic monomers, performs better in fresh water, while PHWAM-2 and PHWAM-3, with hydrophobic monomers, perform better in brine. In addition, PHWAM-3, which has twin-tailed hydrophobic monomers, performs best in high-concentration brine. Measurements of micro-particle size and observations of spatial structure suggest that although the stronger hydrophobic polymer has no DR advantage over a linear polymer in fresh water, the molecular chains form a mutually associative supporting structure that improves the DR performance over that of a linear polymer in high-concentration brine.Keywords:hydrophobic associating polymer;drag reducer;salt tolerance
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiawei Sun,Muhammad Usman Farid,Wenlong Xi,Gang Lu,Min Wei Boey,Sai Kishore Ravi,Patrick H.-L. Sit,Alicia Kyoungjin An
Photothermal-catalytic (PTC) process is a promising way to produce freshwater and clean hydrogen by integrating solar-driven desalination and water splitting. However, efficient solar spectrum utilization coupled with effective mass and thermal management poses key challenges in developing multifunctional PTC systems. Here, a highly stable hydrogel membrane (CdS/MX-HM) that incorporates MXene and in-situ generated CdS as the PTC materials into a customized vacuum membrane distillation (VMD) setup is demonstrated. The CdS/MXene composites utilize the full solar spectrum, with MXene contributing to photothermal ability and serving as a co-catalyst to enhance photocatalytic performance, which are effectively integrated into the membrane system. These functional materials are immobilized within the hydrophilic PVA/chitosan hydrogel layer, which creates a supramolecular network that provides excellent stability and protection while offering an interface for PTC processes. Supported by the hydrophobic PTFE membrane substrate, the integrated system enables fast gas transfer to the permeate, completing the dual-function design. Through systematic optimization of membrane structure and operational parameters, the PTC-VMD system achieves a water flux of 1.63 kg m − 2 h − ¹ and a hydrogen production rate of 3099 µmol m − 2 h −1 under one sun irradiation, demonstrating its potential as a sustainable solution for the water-energy nexus challenge.
研究领域:
环境科学
·
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
IF 4.9
Yuyu Jia,Lin Wang,Shan Li,Junfei Cao,Zhaoguang Yang
Arsenic (As) speciation and bioaccumulation in fish muscle tissues have been intensively investigated in marine ecosystem. However, little is known about these in freshwater fish. In this study, freshwater fish including 120 specimens and 8 species were collected from the Xiang River, a typical mine-impacted river in China. Six As species including arsenite (AsIII), arsenate (AsV), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), arsenocholine (AsC) and arsenobetaine (AsB) were simultaneously separated and determined using HPLC-ICP-MS. The mean (± SD) concentration of total As (tAs) in the dried fish muscle was 0.748 ± 0.651 mg·kg − 1 . AsB was found as the predominant As species in most of the studied fish samples, in accordance with the reports in marine fish. However, the diversity of inorganic/organic As proportion observed in the studied freshwater fish species was larger than that in marine fish species due to greater spatial variability of As contamination, mobilization and origination in the studied catchments. The percentage of AsB (AsB%) in fish muscle was irrelevant to tAs concentration, while the percentage of iAs (iAs%) decreased with tAs concentration in a hyperbolic pattern. This can be attributed to restricted assimilation and accumulation of toxic iAs with increasing tAs concentration in fish. Chronic non-carcinogenic and carcinogenic health risks were evaluated through Monte-Carlo simulation. The result indicated that consuming freshwater fish in the Xiang River could cause considerable carcinogenic risk to local inhabitants.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Menghan Yu,Zongle Gan,Wenjun Zhang,Caihong Yang,Ying Zhang,Aidong Tang,Xiongbo Dong,Huaming Yang
Lake sediments connection to the biogeochemical cycling of phosphorus (P) and carbon (C) influences streamwater quality. However, it is unclear whether and how the type of sediment controls P and C cycling in water. Here, the adsorption behavior of montmorillonite (Mt) with different interlayer cations (Na+, Ca2+, or Fe3+) on dissolved organic matter (DOM) and P was investigated to understand the role of Mt in regulating the organic carbon-to-phosphate (OC/P) ratio within freshwater systems. The adsorption capacity of Fe–Mt for P was 3.2-fold higher than that of Ca–Mt, while it was 1/3 lower for DOM. This dissimilarity in adsorption led to an increased OC/P in Fe–Mt-dominated water and a decreased OC/P in Ca–Mt-dominated water. Moreover, an in situ atomic force microscope and high-resolution mass spectrometry revealed molecular fractionation mechanisms and adsorptive processes. It was observed that DOM inhibited the nucleation and crystallization processes of P on the Mt surface, and P affected the binding energy of DOM on Mt through competitive adsorption, thereby governing the interfacial P/DOM dynamics on Mt substrates at a molecular level. These findings have important implications for water quality management, by highlighting the role of clay minerals as nutrient sinks and providing new strategies for controlling P and C dynamics in freshwater systems.
研究领域:
环境科学
·
生物地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Bin Dong,Yuhao Wang,Yanqing Wu,Lingling Guo,Mengchen Sun,Yunhui Zhang
Freshwater sludge (FS) is daily produced from drinking water treatment plants in large quantities and mostly disposed of in landfills worldwide. Here, we evaluated the feasibility of reutilization of P-saturated FS and derived biochar (FBC) as soil amendments for resource recycling. The results indicate that FS pyrolyzed at 300 °C (FBC300) had the highest adsorption capacity (40.54 mgP/g), and the rate-limiting step of adsorption was film diffusion but gradually altered to intraparticle diffusion with increasing pyrolysis temperature. Adsorbed P primarily existed as stable P fractions (NaOH-P, HCl-P and residue-P) or speciations (AlPO 4 and hydroxyapatite based on X-ray absorption fine structure spectra), but NaOH-P was found to gradually transform into available P (AP) in amended soils with time, achieving continuous release of AP and also reducing P loss through surface run-off. This study offers a novel and feasible reutilization strategy of freshwater sludge as phosphorus adsorbents and subsequent soil amendments to achieve the “zero waste” goal.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Yong Liu,Jingfu Wang,Jingan Chen,Runyu Zhang,Yongxue Ji,Zuxue Jin
Accurate measurement of the oxygen isotopic composition of dissolved phosphate (δ 18 O P ) of different phosphorus (P) fractions in lacustrine sediments is very difficult because of the influence of large amounts of impurities. In this study, we developed a five-step method for obtaining high purity Ag 3 PO 4 sample for the analysis of δ 18 O P of different P fractions in freshwater sediments . Sedimentary P was divided into NaHCO 3 -P, NaOH-P and HCl-P by chemical sequential extraction. Pretreatment procedures for different sedimentary P fractions were improved in the following respects: 1) abandonment of the magnesium-induced coprecipitation method to avoid the introduction of impurity ions, such as Mg 2+ and Cl − , and reduce the loss of P; 2) use of a small amount of non-phosphate activated carbon powder to efficiently remove organic matter in extracts of NaHCO 3 -P and NaOH-P, and reduce the loss of P; 3) adjustment of the HCl-P extract pH to 4 in order to form Fe(OH) 3 -PO 4 3− coprecipitate, thereby removing most of metals and Cl − . This method reduces the pretreatment steps, simplifies the operation and increases the recovery of phosphate (90.98%–96.69%). The high purity Ag 3 PO 4 sample can be obtained and the repeatability and accuracy of measured δ 18 O P is better than 0.3‰, demonstrating high reliability and accuracy. This new method was used to analyze the δ 18 O P of different P fractions in sediments of a eutrophic lake in southwestern China. The preliminary results indicated that the δ 18 O P in the sediments can be used to identify different P sources, and provide new insights into sedimentary P cycling. The method established in this study provides a powerful tool for investigating the sources and biogeochemical cycle of P in freshwater sediments.
研究领域:
环境科学
·
生物地球化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 24
·19596-19606
·
IF 2.828
Ran Xiaofei,Yue Hong,Fu Xiaoli,Kang Yuanhao,Xu Sha,Yang Yanjun,Xu Jinzhu,Shi Junqiong,Wu Zhongxing
The response and detoxification mechanisms of three freshwater phytoplankton species (the cyanobacterium Aphanizomenon flos-aquae , the green alga Pediastrum simplex , and the diatom Synedra acus ) to cadmium (Cd) were investigated. The cell growth of each species was measured over 10 days, and chlorophyll a fluorescence, Cd bioaccumulation (including surface-adsorbed and intracellular Cd), and phytochelatin (PC) synthesis were determined after 96-h exposures. The growth of the three phytoplankton species was significantly inhibited when Cd concentrations were ≥5 mg L −1 . Compared with P. simplex , greater growth inhibition in S. acus and A. flos-aquae occurred. The changes in chlorophyll fluorescence parameters including the maximal quantum yield of PSII (Fv/Fm) and relative variable fluorescence of the J point (Vj) demonstrated that the increase in Cd concentration damaged PSII in all three species. After 96-h exposures, the accumulation of surface-adsorbed Cd and intracellular Cd increased significantly in all three species, with the increase of Cd concentrations in the media; total cadmium accumulation was 245, 658, and 1670 times greater than that of the control in A. flos-aquae , P. simplex , and S. acus , respectively, after exposure to 10 mg L −1 . Total thiols exhibited a similar trend to that of Cd accumulation. PC 3 was found in A. flos-aquae and P. simplex in all Cd treatments. Glutathione (GSH) and PC 2 were also produced in response to exposure to high concentrations of Cd. PC 4 was only discovered at exposure concentrations of 10 mg L −1 Cd and only in S. acus . The intracellular Cd/PCs ratio increased in all three phytoplankton with an increase in Cd concentrations, and a linear relationship between the ratio and the growth inhibition rates was observed with P. simplex and S. acus . Our results have demonstrated that metal detoxification mechanisms were dependent on the species. This study suggested that the variance of metal detoxification strategies, such as cadmium accumulation and PCs, might be an explanation why algal species have different sensitivity to Cd at various levels.
研究领域:
环境生物学
·
生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xuanhe Jia,Yueqiang Pan,Xuexia Zhu
Driven by anthropogenic activities, freshwater salinization has become an emerging global environmental issue . Recent studies indicate that salinization increases the mobility of heavy metals in soil and causes higher flux into surface waterbodies. The present study assessed the combined effects of salinization (0, 3, 6 PSU) and the heavy metal Cd 2+ (0, 0.2, 0.4 mg L −1 ) on the anti-grazing colony formation and population growth of Scenedesmus obliquus , a common freshwater alga. The results showed that the increase in salinity promoted colony formation of S. obliquus with or without the presence of grazing cues and, in contrast, Cd 2+ contamination depressed the defensive colony formation of S. obliquus to Daphnia filtrate. The increase in both salinity and Cd 2+ concentration depressed the population growth of S. obliquus , including impaired photosynthesis and a decreased population growth rate. Salinization moderated the negative effects of Cd 2+ on defensive colony formation of S. obliquus , suggesting increased absorption of Cd 2+ ions by a thicker outer layer of the algal cell wall under saltier conditions. As a result, larger defensive colonies of S. obliquus under freshwater salinization may cause higher bioaccumulation of heavy metals by algal cells and heavier influence on zooplankton. This study provides evidence that freshwater salinization could interfere with plankton interactions by affecting algal defense and growth, which may lead to bottom-up cascading effects on freshwater food webs.
研究领域:
生态学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 20
·2764
·
IF 5.3
Muneerah Alomar,Naila Arshad,Muhammad Sultan Irshad,Shaimaa A. M. Abdelmohsen,Iftikhar Ahmed,Nawal Alhoshani,Areej S. Alqarni
Developing a sustainable environment requires addressing primitive water scarcity and water contamination. Antibiotics such as oxytetracycline (OTC) may accumulate in the environment and in the human body, increasing the risks to the ecosystem. The treatment of polluted water and the production of potable water can be achieved in a variety of ways, including photodegradation, solar distillation, and filtration. Freshwater supplies can be increased by implementing energy-efficient technologies for the production of clean water. Solar water evaporation combined with photocatalytic degradation and sterilization offers a promising avenue for integration into the clean water and energy production fields. The present study reports the synthesis of a 3D solar steam generator comprised of BiVO4and carbon nanotubes (CNT) nanocomposite decorated over a cigarette filter as the light-to-heat conversion layer for solar steam generation. The BiVO4@CNT-based 3D solar evaporator over the hydrophilic cellulosic fibers of the cigarette filter endowed excellent evaporation rates (2.36 kg m−2h−1) under 1 kW m−2solar irradiation, owing to its superior hydrophilicity and broadband solar absorption (96%) equipped with localized heating at microscale thermal confinement optimized by the minimum thermal conductivity of the overall system. Furthermore, the BiVO4@CNT composite exhibited a heightened photo activity up to 83% of the photodegradation of oxytetracycline (OTC) antibiotic due to the inhibition of charge recombination from the industrial effluents. This approach transforms the water-energy nexus into a synergistic bond that offers opportunities to meet expected demand, rather than being competitive.Keywords:solar evaporation;BiVO4;MWCNTs;photocatalytic;freshwater;oxytetracycline
研究领域:
环境科学
·
材料科学
·
生物学
✓ 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）