JOURNAL OF HAZARDOUS MATERIALS
·
2013
·
IF 3.925
Ruijuan Qu,Xinghao Wang,Zhengtao Liu,Zhenguang Yan,Zunyao Wang
Cadmium (Cd) compounds are widely distributed toxic environmental and industrial pollutants, and they may bring danger to growth and development of aquatic organisms. The effects of Ca 2+ (as CaCl 2 ), Mg 2+ (as MgSO 4 ), K + (as KCl), pH and complexants (EDTA, the commercial DOM , and three homemade DOMs) on Cd toxicity to Photobacterium phosphoreum were evaluated in standardized 15 min acute toxicity tests . Increases in Ca 2+ concentration resulted in higher EC 50 values, indicating the competition between the two ions for uptake sites at the biotic ligand. Increased waterborne Mg 2+ also reduced Cd toxicity, but to a slightly lesser degree compared with Ca 2+ . The overall decline in EC 50 data with increasing K + in test solutions suggested that Cd toxicity was enhanced at larger K + concentration. The toxicity alleviation by H + was observed over the tested pH range of 5.0–9.0. Additions of complexing agents into the exposure water reduced Cd bioavailability via complexation of Cd 2+ , and complexants from different sources displayed different protective effect. The influence of these toxicity modifying factors was finally incorporated into a model that can predict acute cadmidum toxicity for Photobacterium phosphoreum . After validation with laboratory and natural waters, the developed model could support efforts to improve the ecological relevance of presently applied risk assessment procedures.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Fei Wang,Jiuyan Chen,Yalei Xu,Usman Farooq,Taotao Lu,Weifeng Chen,Xinhai Wang,Zhichong Qi
Knowledge of the mobility of tetracycline (TC) antibiotics in porous media is critical to understand their potential environmental influences. The transport characteristics of TC in sand columns with three different surfactants, including Tween 80, sodium dodecylbenzene sulfonate (SDBS), and didodecyldimethylammonium bromide (DDAB) under various conditions were investigated in this study. Results demonstrated that all surfactants enhanced TC transport under neutral conditions (10 mM NaCl at pH 7.0). The observation was attributed mostly to deposition site competition, higher electrostatic repulsion between TC molecules and sand grains, steric hindrance, and the increase of TC hydrophilicity. Furthermore, the order of the transport-enhancement effects was generally observed as follows: DDAB > SDBS > Tween 80. The trend was controlled by the variation in the physicochemical properties of surfactants. It was noticed that the presence of Cu 2+ (a model divalent cation) in the background solution, the cation-bridging contributed to the promotion effects of DDAB or Tween 80 on TC mobility. Interestingly, SDBS considerably suppressed TC transport due to the precipitation of SDBS–Cu 2+ complexes onto sand surfaces. Moreover, the enhancement order of surfactants at pH 5.0 was similar to that pH 7.0. However, DDAB could inhibit TC transport in sand columns at pH 9.0, which were mainly caused by the decrease of electrostatic repulsion and the hydrophobicity induced by the binding cationic surfactant. Findings from this work provide novel insight into involvement of surfactants in antibiotic transport behaviors in the subsurface environment.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jianle Wang,Na Li,Le Yuan,Qing Zhu,Nan Lan,Zejia Zhao,Zhixu Chen,Xueming Liu,Hong Deng
In recent years, the search for effective antimony adsorption materials has been unyielding. However, the exploration of zeolite imidazolate frameworks (ZIFs) as potential adsorbents, along with the influence of material surface structure and water chemistry on their performance remain under explored. In this study, various molar ratios of Zn 2+ and 2-methylimidazole are employed to synthesize three distinct shapes of ZIFs: cube , leaf, and dodecahedron . The experimental outcomes reveal that Leaf-ZIFs, exhibit exceptional adsorption capabilities for Sb(III), the maximum adsorption capacity of Leaf-ZIFs was 57.3 mg g −1 . The adsorption kinetics adhere to the pseudo-second-order model, and equilibrium is achieved in approximately 10 h. Additionally, the adsorption isotherm curve is consistent with the Freundlich model. Through comprehensive batch experiments, we thoroughly examined the impact of varying solution pH levels, coexisting ions, and the coexistence of humic acids on the adsorption of Sb(III). The Leaf-ZIFs exhibited remarkable adaptability in neutral, alkaline, and low-concentration heteroionic environments, while demonstrating minimal interference from humic acid present in the solution. Analysis using SEM, XPS, and FTIR techniques revealed that the adsorption mechanism of Leaf-ZIFs primarily involved the partial breakage of the Zn-N bond within the material's structure . This breakage led to the formation of Zn-OH groups, which subsequently reacted with Sb(III) molecules through the -OH groups. The culmination of this process was the formation of Zn-O-Sb bonds, resulting in the effective adsorption of Sb(III) from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Xu Chen,Yong Sik Ok,Dinesh Mohan,Charles U. Pittman,Xiaomin Dou
The increasingly wide use of semiconductor nanocrystals inevitably leads to their release into aquatic environment. The aggregation behaviors of 3-mercaptopropionic acid-capped CdSe/CdS core-shell quantum dots (MPA-QDs) under various water chemistry conditions were examined and their removal using Fe 3+ and Al 3+ coagulants was evaluated. Cationic species rather than concentrations affected the stability of MPA-QDs. Adding 2 mM Ca 2+ led to a much larger ζ-potential decrease and particle size increase than adding 150 mM K + at each tested solution pH. This indicated that complexation and depletion of surface-bound carboxyl groups by divalent Ca 2+ has a more pronounced effect than compression of the electrical double layer by high concentrations of monovalent K + . The presence of humic acid increased the stability of MPA-QDs, which might increase negative surface charging via overcoating or bind to the surface of MPA-QDs. The nanoparticles exhibited similar aggregation kinetics patterns in tap water and seawater, but varying patterns in the lake water because of the co-existence of 2.3 mM total of Ca 2+ and Mg 2+ . MPA-QDs (5 mg L −1 ) were readily coagulated by 2.4 mM Al 3+ or 1.2 mM Fe 3+ in tap water. Al 3+ and Fe 3+ can bind with carboxyl groups of the surface capping ligands, neutralize the negative charges on the surface of MPA-QDs and decrease the electrostatic repulsion forces to induce MPA-QDs aggregation. In addition, MPA-QDs could be bound with and wrapped into the flocs of hydrolysis products of coagulants. The results reported here could help broaden our understanding of the impacts and remediation of water-dispersed core-shell QD nanoparticles.
研究领域:
环境科学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Pei Gao,Chun Yang,Zhijie Liang,Wenhao Wang,Zhiwei Zhao,Bibo Hu,Fuyi Cui
To achieve an enhanced and selective adsorption of steroid estrogens, the n-propyl functionalization was applied to the mesoporous silica material (MCM-41) according to the physico-chemical property analysis of steroid estrogens. Adsorption behaviour and water chemistry effects were evaluated with the most concerned steroid estrogens: estrone (E1), 17β-estradiol (E2) and 17α-ethinyl estradiol (EE2) based on the materials characterization. The results showed the uptakes of E1, E2, and EE2 onto the modified MCM-41 were enhanced and accelerated by the n-propyl functionalization, which was positively correlated with the hydrophobicity of the synthesized materials. Kinetic data fitted the pseudo-second-order model well. Based on the Langmuir model, the maximum adsorption capacities of the n-propyl modified MCM-41 were up to 119.87, 88.38, and 86.91 mg g −1 for EE2, E1, and E2, respectively. Importantly, both acid and neutral solutions were beneficial to estrogen removal, but ionic strength and humic acid did not affect the estrogen adsorption. The above results suggested that the n-propyl functionalized MCM-41 would be a promising adsorbent for the rapid and efficient removal of estrogens with the selectivity from natural organic matter like humic acid. Mechanism analysis showed the key role of hydrophobic interaction, and it also confirmed the contribution of the carbonylic lone pair electrons of E1, which helped the formation of stronger hydrogen bonds with silicon hydroxyls and enhanced the dipole-dipole interaction between E1 and the synthesized materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117844
·
IF 6.2
Zhuangzhuang Ma,Yunhao Wang,Tianhao Rui,Yulin Lan,Linyuan Lu,Yang Yu,Mingxuan Deng,Tianxing Lan,Zhekang Zhao,Zhen Teng,Haibin Zhang
High-entropy pyrochlore ceramics with the nominal composition Eu 2 B 2 O 7 , incorporating up to five equiatomic B-site cations, were synthesized via a solid-state reaction method and evaluated their aqueous chemical durability for nuclear waste immobilization. Comprehensive characterization using XRD, Raman, and SEM analyses confirmed the formation of a single-phase pyrochlore structure with uniform and random elemental distribution. However, secondary phases were observed in the Ce- and Nb-doped samples, which is attributed to the larger ionic radius of Ce and the higher valence state of Nb. The 42 days leaching tests revealed normalized element release rates ranging from 10 −5 to 10 −7 g/(m 2 ∙d), significantly lower than those of conventional pyrochlore materials. This enhanced durability is attributed to synergistic effects of electronegativity, ionic radius, and atomic number, which together hinder cation diffusion and strengthen chemical durability at the B site. These findings demonstrate the potential of Eu 2 B 2 O 7 high-entropy pyrochlore ceramics as long-term host materials for high-level radioactive waste. This study provides a valuable resource for enriching the thermophysical properties database of B-site high-entropy pyrochlore solidification, thereby supporting their engineering development.
研究领域:
材料科学
·
核化学
·
无机非金属材料
·
放射性废物处理
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
Water Cycle
·
2025
·
IF 8.7
Yanting Xi,Sihan Fan,Yixin Liu,Danni Cui,Zhicheng Liao,Ziwei Guo,Chaochao Lai,Haodong Zhang,Zhe Zhang,Fengxia Han,Huan He,Bin Huang,Xuejun Pan
The dissolved organic matter in initial rainwater (RDOM), including soil-dissolved organic matter (SDOM) and water-soluble organic matter (WSOM) in the atmosphere, can potentially mediate the migration and transformation of contaminants in natural water. However, researches on its sources, characteristics, and impact of environmental factors are limited. This study aims to investigate the main sources of RDOM and its properties influenced by environmental factors (such as light exposure and temperature variation). The results revealed that RDOM was mainly composed of SDOM. Temperature (–5°C, −20°C, temperature alternating, 40°C, 50°C, 60°C) induced the variation of SDOM components, altering its fluorescence characteristics, aromatic components, and hydrophobicity. And high temperature showed a more pronounced effect on SDOM components. However, temperature fluctuations had different impacts on the SDOM-mediated photodegradation of bisphenol A (BPA). Among them, only SDOM that had undergone freeze-thaw cycles exhibited a promotive effect on the photodegradation of BPA, with the most significant effect observed at −20°C. Illumination (ultraviolet light (UV) and natural light (NL)) consumed the chromophoric groups of SDOM, disrupted its intricate electron transfer structure, and reduced the production of •OH and Triplet-state dissolved organic matter ( 3 DOM∗). So, illumination, especially UV, significantly weakened its mediating effect on the photodegradation of BPA. Based on these findings above, RDOM through temperature increase and illumination potentially leads to an inhibition of the degradation rate of organic pollutants. Conversely, RDOM may exhibit an enhanced ability following a freeze-thaw process. This study is crucial for elucidating the environmental effects of RDOM.
研究领域:
环境科学
·
水化学
·
光化学
·
污染物降解
·
有机地球化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Penghui Du,Kexin Tang,Biwei Yang,Xiaohan Mo,Junjian Wang
Measuring the quantum yield and reactivity of triplet-state dissolved organic matter (3DOM*) is essential for assessing the impact of DOM on aquatic photochemical processes. However, current 3DOM* quantification methods require multiple fitting steps and rely on steady-state approximations under stringent application criteria, which may introduce certain inaccuracies in the estimation of DOM photoreactivity parameters. Here, we developed a global kinetic model to simulate the reaction kinetics of the hv/DOM system using four DOM types and 2,4,6-trimethylphenol as the probe for 3DOM*. Analyses of residuals and the root-mean-square error validated the exceptional precision of the new model compared to conventional methods. 3DOM* in the global kinetic model consistently displayed a lower quantum yield and higher reactivity than those in local regression models, indicating that the generation and reactivity of 3DOM* have often been overestimated and underestimated, respectively. The global kinetic model derives parameters by simultaneously fitting probe degradation kinetics under different conditions and considers the temporally increasing concentrations of the involved reactive species. It minimizes error propagation and offers insights into the interactions of different species, thereby providing advantages in accuracy, robustness, and interpretability. This study significantly advances the understanding of 3DOM* behavior and provides a valuable kinetic model for aquatic photochemistry research.
研究领域:
环境科学
·
光化学
·
水化学
·
动力学建模
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Xiaoxiao Chen,Qianyi Huang,Rui Hou,Shan Liu,Hengxiang Li,Tiantian Chen,Xiangrong Xu
The estuarine environment is a complex and dynamic ecosystem in the transition zone where rivers meet the sea. However, information on the distribution, fate, and risks of novel organic ultraviolet filters and stabilizers (OUVs) in estuaries remains limited. In this study, the occurrence of benzotriazole (BT) and benzothiazole (BTH) derivatives in seawater, suspended particulate matter (SPM) and sediments in the Pearl River Estuary (PRE) was analysed. The total concentrations of both types of derivatives were much lower than those of their parent compounds in all the samples. 2-(2-Hydroxy-3-tert-butyl-5-methyl-phenyl)-5-chloro-benzotriazole (UV-326) and 5-methyl-1H-benzotriazole (5-TTri) were the main contributors to the total occurrence of BT derivatives in seawater, whereas UV-326 and 5-chloro-2-(3,5-di-tert-butyl-2-hydroxyphenyl) benzotriazole (UV-327) emerged as significant derivatives in sediments. 2-mercapto-benzothiazole (2-SH-BTH) and 2-thiocyanomethylthio-benzothiazole (2-SCNMeS-BTH) were the most important BTH derivatives in seawater and sediments, respectively. The mass balance modelling results indicated that riverine and coastal discharges serve as the primary input pathways for BT derivatives (1.50 × 10 4 and 8.29 × 10 3 kg/yr in summer and winter, respectively) and BTH derivatives (1.32 × 10 4 and 9.46 × 10 3 kg/yr in summer and winter, respectively) into the PRE. Moreover, outputs to the outer ocean play a decisive role in determining their main fates, with contributions ranging from 69.3 % to 84.3 %. The sedimentation and degradation of BT and BTH derivatives were not the primary sinks in seawater, suggesting that the estuary cannot serve as a significant barrier for these land-based pollutants. The risk quotient (RQ) results indicated that 2-SCNMeS-BTH has a moderate ecological risk (RQ of 0.105) in sediments, whereas all other BTs and BTHs have a relatively low risk (RQ < 0.1). This investigation offers pivotal insights into the environmental behaviours and ecological impacts of emerging marine pollutants within estuarine ecosystems.
研究领域:
环境科学
·
海洋污染研究
·
生态毒理学
·
水化学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 32
·e02772
·
IF 2
Dan Zhao,Shunkai Zhang,Weili Yang,Cheng Xue,Guanglite Shen,Wenhui Zhang,Huixia Feng,Nali Chen,Lin Tan
Graphical Through the calculation based on the e-DLVO theory, investigate the aggregation situation of sulfonated phenolic resin in diverse aquatic environments. Plastic waste is widely recognized as a global environmental threat. Nanoplastics (NPs), derived from the degradation of macroplastics and microplastics, pose potential risks to human health. The aggregation behavior of NPs in aquatic systems is primarily governed by electrolyte concentration and pH. In this study, the aggregation behavior of NPs, represented by sulfonated lignin phenolic resin (SLPFR), was systematically investigated in aqueous solutions containing a series of monovalent and divalent electrolytes. Aggregation kinetics experiments, adsorption studies, material characterization, and extended-Derjaguin–Landau–Verwey–Overbeek (e-DLVO) theoretical calculations demonstrated that electrostatic interaction is the dominant force governing the aggregation of SLPFR NPs. Different electrolyte types alter the surface charge of NPs, consequently increasing the electrostatic repulsion and steric hindrance between particles. These findings provide significant insights for better assessing the aggregation of NPs in diverse aquatic environments and their associated environmental impacts and risks.
研究领域:
环境科学
·
高分子科学
·
纳米技术
·
胶体与界面科学
·
水化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2025
·
IF 8.1
Danming Wen,Junyao Wang,Miaomiao Ding,Aikeyidanmu Zhamaerding,Xialin Hu,Daqiang Yin
Iodinated disinfection by-products (I-DBPs) have raised concerns due to their potential cytotoxicity and genotoxicity compared to chlorine and bromine-based by-products. In aquaculture, high-dose iodine-based disinfectants can react with natural organic matter (NOM) in water, generating significant amounts of I-DBPs that might pose environmental risks. This research explored the reaction characteristics of I-DBPs by using two commonly used iodine-based disinfectants (iodine tincture and Polyvinylpyrrolidone-iodine (PVP–I)) in aquaculture. The results indicated that controlling pH at around 8.0 effectively reduced I-DBP formation. A higher concentration of PVP-I (10 μM) was required to produce triiodomethane (TIM) compared to iodine tincture (2.5 μM), likely due to the slower release of iodine from PVP-I. The concentrations of I-DBPs showed a multiplicative growth trend as the concentrations of the iodine-based disinfectants increased. Humic acid (HA) demonstrated a stronger potential for I-DBP formation than algal-derived organic matter (AOM), including extracellular organic matter (EOM) and intracellular organic matter (IOM), due to its strong electron-withdrawing aromatic structure. While EOM led to a greater variety of I-DBPs, IOM contributed more significantly to TIM formation at higher disinfectant concentrations, probably due to its large molecular size and abundance of reactive carbon atoms. The I-DBP formation patterns in the aquaculture water are similar to those of HA, possibly due to the presence of similar compositional components, such as lignin and proteins. The study provides important insights for optimizing iodine disinfectant use in aquaculture and managing I-DBP risks.
研究领域:
环境科学
·
水产养殖
·
水化学
·
毒理学
·
消毒副产物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Ruiya Zhou,Xu Zhang
Tryptophan (Trp) and tyrosine (Tyr) are the primary precursors of protein-like components in dissolved organic matter. Phenolic compounds are ubiquitous in aquatic environments and are considered the main electron donor in chromophoric dissolved organic matter (CDOM). Our results showed that Trp and Tyr (50 μM) enhanced the transformation of six monophenols (20 μM) with varying numbers of −CH3 and −OCH3 substituent groups by a factor of 1.0–1.8. The enhancement factor increased with the ratio of Trp (Tyr) to monophenols. In four different CDOM solutions (5 mg C/L, pH 8.0), a maximum enhancement factor of 3.2–6.7 was observed at a Trp/monophenol concentration ratio of 50. Conversely, monophenols greatly inhibited the transformation of Trp or Tyr. The enhancement factor decreased as the initial pH increased from 3.0 to 10.0. Additionally, the enhancement factor was not directly proportional to the oxidation potential of monophenol. We propose that the promotion effects are generated through the direct oxidation of monophenols by Trp (Tyr) radicals as well as through the reaction between Trp (Tyr) radicals and the one-electron reductant of CDOM.
研究领域:
环境科学
·
水化学
·
有机地球化学
✓ 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）