Environmental Science-Water Research & Technology
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2021
·Vol. 7
·期 7
·1220-1229
·
IF 4.251
Guangqian Yang,Zhengyi Liu,Tingting Lan,Li Dou,Kankan Zhang
A liquid chromatography with tandem mass spectrometry method was developed and applied for the investigation of penthiopyrad photolysation and hydrolysation in different aqueous solutions, and the potential enantioselectivity of this chiral fungicide was further assessed. Good linearity was obtained (R2 > 0.99) for R-(−)- and S-(+)-penthiopyrad in different matrices and the respective limits of detection and quantitation of both enantiomers were 0.003 μg mL−1 and 0.01 μg mL−1. The most suitable illumination intensity for photolysing penthiopyrad was 400 W. Other factors such as pH, salinity and flavonoid also influenced penthiopyrad photolysation. In an acidic solution, the photolytic degradation rate of penthiopyrad enantiomers decreased due to their chemical structures and physicochemical characteristics. Different salinities affected penthiopyrad photolysation differently; acceleration occurred in solutions with salinities of 0.5% or 3.0% due to effective catalysis by photosensitive chloride radical anions, and when the salinity was 1.0% or 2.0%, the inhibitory effect of inorganic salt decreased the photolysation rate. The addition of different flavonoids could significantly inhibit the photolysation of penthiopyrad by decreasing degradation 5–597 times through photo-quenching effects. Under some conditions, the S-(+)-enantiomer was photolysed faster than its antipode, indicating that the photolysation of penthiopyrad was enantioselective. During the hydrolysation process, penthiopyrad degraded faster in the acidic solution than in the other two aqueous solutions with different pH levels, which was attributed to the hydrogen ion-induced catalytic reaction. In sterile/nonsterile natural water matrices, the hydrolysation rate of penthiopyrad enantiomers was also influenced by pH, in the degradation order of tap water (pH 7.1) > rain water (pH 7.3) > lake water (pH 8.8). Enantiopure enantiomers were hydrolysed more slowly than racemic enantiomers due to their mutual promotion effects. The configuration stability of penthiopyrad enantiomers was preserved during the degradation process. Similar enantioselectivities of the hydrolysation of penthiopyrad and preferential degradation of the S-(+)-enantiomer were observed in some aqueous solutions. The results could provide some data to more accurately demonstrate the enantioselective environmental fate and risk of penthiopyrad in aquatic environments.
研究领域:
环境科学
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农业化学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Dehua Zeng,Chen Yang,Ziqing Huang,Yanjun Liu,Sijia Liu,Zhiyu Zhang,Weilin Huang,Zhi Dang,Chengyu Chen
Heteroaggregation between polystyrene nanoplastics (PSNPs) and soot nanoparticles (STNPs) in aquatic environments may affect their fate and transport. This study investigated the effects of particle concentration ratio, electrolytes, pH, and humic acid on their heteroaggregation kinetics. The critical coagulation concentration (CCC) ranked CCC PSNPs > CCC PSNPs-STNPs > CCC STNPs , indicating that heteroaggregation rates fell between homoaggregation rates. In NaCl solution, as the PSNPs/STNPs ratio decreased from 9/1 to 3/7, heteroaggregation rate decreased and CCC PSNPs-STNPs increased from 200 to 220 mM due to enhanced electrostatic repulsion. Outlier was observed at PSNPs/STNPs= 1/9, where CCC PSNPs-STNPs = 170 mM and homoaggregation of STNPs dominated. However, in CaCl 2 solution where calcium bridged with STNPs, heteroaggregation rate increased and CCC PSNPs-STNPs decreased from 26 to 5 mM as the PSNPs/STNPs ratio decreasing from 9/1 to 1/9. In composite water samples, heteroaggregation occurred only at estuarine and marine salinities. Acidic condition promoted heteroaggregation via charge screening. Humic acid retarded or promoted heteroaggregation in NaCl or CaCl 2 solutions by steric hindrance or calcium bridging, respectively. Other than van der Waals attraction and electrostatic repulsion, heteroaggregation was affected by steric hindrance, hydrophobic interactions, π − π interactions, and calcium bridging. The results highlight the role of black carbon on colloidal stability of PSNPs in aquatic environments.
研究领域:
环境科学
·
胶体化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jin-Hyuk Choi,Mingi Ko,Soyeong Yoon,Narae Kim,Taesoon Jang,Myeongsong Lee,Jeong-Ann Park
A three-dimensional porous graphene oxide/chitosan (GO/CS) sponge (average pore size = 21.67 μm; pore size distribution = 0.75–319.26 μm, total pore area = 1.84 m 2 /g; and pH pzc = 5.76) was evaluated for the polystyrene (PS) NPs (hydrodynamic diameter = 31.1 ± 0.4 nm) removal from aqueous solutions. The adsorption kinetics followed a pseudo-second-order model, and intra-particle diffusion occurred in three distinct stages: film diffusion, pore diffusion, and surface sorption. Adsorption isotherms aligned best with the Langmuir model, indicating a maximum adsorption capacity of 33.30 mg/g. Thermodynamic analysis showed that PS NPs adsorption was spontaneous (ΔG° < 0) and endothermic (ΔH° > 0) within the temperature range of 283–293 K. FT-IR and XPS analyses confirmed that adsorption occurred through multiple mechanisms, including electrostatic attraction, hydrogen bonding, and π–π stacking. The adsorption behavior was significantly affected by pH, salinity, and competing ions. The highest adsorption capacity (17.99 mg/g) was observed at pH 5.5, which is close to the pH PZC (5.76) of the sponge, due to favorable electrostatic and hydrophobic interactions. As NaCl concentration increased, adsorption capacity remained stable up to 20 mM, but declined sharply above 100 mM due to PS NPs aggregation. Divalent cations, particularly Ca 2+ , significantly reduced adsorption by compressing the electrical double layer and enhancing aggregation, while monovalent cations and anions had minimal impact. The sponge was reusable after a simple squeeze-wash regeneration, achieving 83.12 % removal efficiency after 12 consecutive adsorption–desorption cycles. Compared to deionized water, real water samples exhibited similar or improved adsorption capacities, with the highest capacity observed in seawater (15.78 mg/g).
研究领域:
环境科学
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材料科学
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水污染控制
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纳米毒理学
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环境化学
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可持续技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Jiali Ge,Danyu Huang,Zerong Han,Xiaolin Wang,Xinghao Wang,Zunyao Wang
Benzophenones (BPs), which are widely used UV filters, have aroused considerable public concern owing to their potential endocrine-disrupting activities. Herein, we systematically investigated their photochemical behavior and fate, which is mediated by nitrate in aquatic environments. The results showed that 10 μM of 3 BPs can be completely degraded within 4 h of simulated sunlight irradiation in a 10 mM nitrate solution at pH 8.0, and 2,4-dihydroxybenzophenone (BP-1) has a 31.6% mineralization rate after 12 h irradiation. Their photolytic rates ( k obs ) presented a significant linear correlation with the logarithmic values of the nitrate concentration for 0.1–10 mM ( R 2 > 0.98), and in three actual waters, the rates of BP-1 were also positively related to the intrinsic nitrate concentration. Furthermore, higher transformation rates under alkaline condition were observed, especially for BP-1, with its k obs at pH 10 being 8.3-fold higher than that at pH 6.0. Moreover, dissolved oxygen (DO) also has an impact on the reaction kinetics to some degree. According to the quenching experiments, we found that three reactive oxygen species (ROS), namely, •OH, •NO, and •NO 2 , participated in this photolysis of BPs, and the contribution of •OH accounted for 32.1%. Furthermore, we selected BP-1 as the model molecule to study the transformation pathways and toxicity changes in this system. Four main transformation pathways including hydroxylation, nitrosylation, nitration, and dimerization were proposed, based on liquid chromatography quadrupole time-of-flight mass spectrometry (LC-Q-TOF-MS) analysis and density functional theory (DFT). According to the toxicity test , the formed intermediates were more toxic to Photobacterium phosphoreum than the parent BP-1. Therefore, these results can help reveal primary phototransformation mechanisms and evaluate the potential ecological risks of BPs in aquatic environments.
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
WATER RESEARCH
·
2024
·
IF 11.4
Pengfei Yu,Zhongyu Guo,Jieqiong Wang,Yuchen Guo,Tingting Wang,Lilan Zhang
Methylisothiazolinone (MIT) and Benzisothiazolinone (BIT) are two widely used non-oxidizing biocides of isothiazolinones. Their production and usage volume have sharply increased since the pandemic of COVID-19, inevitably leading to more release into water environment. However, their photochemical behaviors in water environment are still unclear. Therefore, this study investigated photodegradation properties of MIT and BIT in natural water under simulated sunlight. The results demonstrated that direct photolysis was mainly responsible for their photodegradation which occurred through their excited singlet states rather than triplet states. The quantum yields of MIT and BIT photodegradation were 11 - 13.6 × 10 −4 and 2.43 - 5.79 × 10 −4 , respectively. pH had almost no effect on the photodegradation of MIT, while the photodegradation of BIT was significantly promoted under alkaline condition due to abundance of BIT in its deprotonated form (BIT- N − ). Cl − , NO 3 − and dissolved organic matter (DOM) in natural water inhibited the photodegradation of both MIT and BIT, with the light screening effect of DOM being the most significantly inhibitory factor. The addition of other isothiazolinones, which possibly coexisted with MIT and BIT in actual condition, slightly inhibited the photodegradation of MIT and BIT. The estimated half-life under natural sunlight at a 30°N latitude was estimated to be approximately 1.1 days. The photodegradation pathways of MIT and BIT are similar, primarily initiated from the ring-opening at the N-S bond, with Frontier electron densities (FED) calculations suggesting the likelihood of oxidation and ·OH addition reactions at the O, N, and S sites. While the photodegradation products exhibited significantly reduced acute toxicity compared to their parent compounds, they nonetheless posed substantial chronic toxicity. These insights are vital for assessing the ecological impacts of MIT and BIT in aquatic environments.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zigong Ning,Shuang Zhou,Pengxiang Li,Rong Li,Feihua Liu,Zilong Zhao,Nanqi Ren,Lu Lu
Biofilm-developed microplastics (MPs) may serve as important vectors for contaminants in aquatic environments. Elucidating the interactions between biofilm-developed MPs and coexisting contaminants is crucial for understanding the vector capacities of MPs. However, little is known about how the adverse effects of contaminants on MP surface-colonized biofilms influence their vector capacity. In this study, we aimed to investigate the interaction mechanism of biofilms colonizing the surface of MPs with coexisting contaminants using microcosm experiments and biofilm characterization techniques. The results indicated that the biofilm biomass on polystyrene increased over time, providing an additional abundance of oxygen-containing functional groups and promoting Cd accumulation by biofilm-developed polystyrene . Moreover, as a coexisting contaminant, Cd exerted adverse effects such as additional mortality of microorganisms and senescence and MP-colonized biofilm shedding. Consequently, the contaminant vector capacity of biofilm-developed MPs could be mitigated. Thus, the adverse effects of coexisting contaminants on biofilms influenced the ability of MPs to act as vectors in aquatic environments. Neglecting the negative effects of contaminants on biofilms may lead to an overestimation of the contaminant vector capacity of biofilm-developed MPs. This study provides support for more accurate assessment of the interactions between biofilm-developed MPs as vectors and contaminants in aquatic environments.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 19
·10541-10548
·
IF 2.936
Yongqin Zeng,Xiaoxuan Lin,Fuhua Li,Ping Chen,Qingqing Kong,Guoguang Liu,Wenying Lv
In this study, nitrate ion (NO3−) was found to collaborate with ozone thereby accelerating the degradation of ketoprofen. NO3− was discovered to induce the generation of hydroxyl radicals (·OH), which was crucial to the decomposition of PPCPs in wastewater treatment plants. Kinetic studies on the decomposition of ketoprofen were investigated under different concentrations of NO3−. The impact mechanisms and degradation by-products were experimentally determined. The results revealed that all reactions fitted the pseudo-first-order kinetic model well. The presence of NO3− had the capacity to accelerate the ozonation of ketoprofen. The reaction by-products were evaluated by UPLC-Q-TOF-MS, and a total of five intermediates generated via the ozonation of ketoprofen were assessed. The transformation pathways were concluded to be hydroxylation, nitration, and debenzophenone and ketonized reactions. Additionally, the toxicity of the by-products was evaluated by employing Chlorella and Daphnia magna.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jiayan Wu,Jieyu Liu,Pingxiao Wu,Leiye Sun,Meiqing Chen,Zhongbo Shang,Quanyun Ye,Nengwu Zhu
The ubiquitous Al 2 O 3 is anticipated to interact with nanoplastics , affecting their fate and transport in aquatic environments. In this study, the heteroaggregation and deposition behaviors of polystyrene nanoplastics (PSNPs) on Al 2 O 3 were systematically investigated under different conditions (ionic strength, pH, and natural organic matter). The results showed that significant heteroaggregation occurred between PSNPs and Al 2 O 3 particles under acidic and neutral conditions. When the NaCl concentration was increased from 50 to 500 mM, the heteroaggregation ratio gradually increased. However, poly (acrylic acid) (PAA) inhibited the heteroaggregation of PSNPs-Al 2 O 3 due to steric repulsion. The deposition of PSNPs on Al 2 O 3 surfaces was inhibited as the NaCl concentration or pH values increased. Due to charge reversal and steric repulsion, humic acid (HA) and fulvic acid (FA) prevented the deposition of PSNPs onto Al 2 O 3 surfaces, and the former was more effective in reducing the deposition rate . The interaction mechanism between PSNPs and Al 2 O 3 was revealed by using various characterization techniques and density function theory (DFT) calculation. The results demonstrated that in addition to the dominant electrostatic interaction, there were also weak hydrogen bonds and van der Waals interactions. Our research is of great significance for predicting the migration and fate of PSNPs in aquatic environments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 11
·期 19
·8829
·
IF 2.679
Yuanzhang Ma,Guoyu Wang,Yuanyuan Wang,Wei Dai,Yaning Luan
The use of phytoremediation technology to remove heavy metal ions from aquatic environments or reduce their toxicity offers the possibility of restoring the ecological environment of polluted water bodies. Based on available literature on heavy metal absorption by aquatic plants, we conducted a meta-analysis to study the absorptive capacities of different plants as well as the factors that influence their Hg-absorption performance. Seventeen plant families, including Araceae, Haloragaceae, Hydrocharitaceae, and Poaceae, have a strong Hg-absorption capacity. The root systems of aquatic plants belonging to these families are primarily responsible for this remediation function, and only a limited proportion of Hg+that enters a plant via the root system is transferred to other plant organs. Additionally, the diversity of plant life habits (e.g., floating, submerged, and emergent) and the water pH significantly influence the ability of plants to absorb Hg. It is expected that this study will provide a reference for the cultivation of aquatic plants for restoring the ecological environment of Hg-polluted water bodies.
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Yi Yang,Nan Zhang,Qi You,Xin Chen,Yinqing Zhang,Lingyan Zhu
Due to the increasing applications, silver nanoparticles (AgNPs) are inevitably released into the environments and are subjected to various transformations. Chloride ion (Cl − ) is a common and abundant anion with a wide range of concentration in aquatic environments and exhibits a strong affinity for silver. The results indicate that AgNPs experienced multistep chlorination, which was dependent on the concentration of Cl − in a non-linear manner. The dissolution of AgNPs was accelerated at Cl/Ag ratio of 1 and the intensive etching effect of Cl − contributed to the significant morphology changes of AgNPs. The dissolved Ag + quickly precipitated with Cl − to form an amorphous and passivating AgCl(s) layer on the surface of AgNPs, thus the dissolution rate of AgNPs decreased at higher Cl/Ag ratios (100 and 1000). As the Cl/Ag ratio further increased to 10,000, the overall transformation rate increased remarkably due to the complexation of Cl − with AgCl(s) to form soluble AgCl x (x-1)− species, which was verified by the reaction of AgCl nanoparticles with Cl − . Besides, several environmental factors (electrolytes, surfactants and natural organic matter) affected AgNPs dissolution and the following chlorination. These results will expand the understanding of the environmental fate and potential risks of AgNPs in natural chloride-rich waters.
研究领域:
环境科学
·
纳米技术
·
水污染治理
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产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2020
·
IF 9.13
Jing Li,Xin Zhang,Wen-Yuan Fan,Mu-Cen Yao,Guo-Ping Sheng
Free DNA bases are widely present in the environments, and can be utilized by bacteria for their nucleic acids synthesis or as nutrition sources. In sunlit natural waters, these free bases probably undergo photodegradation which would change the bioavailable bases contents. Though the photodegradation of DNA has been investigated, the photodegradation behaviors of free bases may be quite different from those of DNA-confined bases in consideration of their different chemical environments. Herein, the photodegradation of four free bases (guanine, adenine , thymine and cytosine) was investigated. Results show that direct photodegradation of free bases in phosphate buffer caused by UV was slow. However, the photodegradation of these free bases were greatly enhanced in dissolved organic matter (DOM) solution. In the presence of 10–50 mg/L DOM, the photodegradation rates of free bases were increased by 1.85–14.6 times compared to the controls without DOM. DOM could result in indirect photodegradation by producing hydroxyl radical (•OH) and singlet oxygen ( 1 O 2 ) under irradiation, and this indirect photodegradation enhanced and dominated the free bases photodegradation. The •OH was involved in all four bases photodegradation, while the 1 O 2 only participated in guanine photodegradation. In phosphate buffer, the fastest photodegradation bases were pyrimidine, however, guanine became the fastest photodegradation base in DOM solution due to the selective oxidation of guanine by 1 O 2 . In summary, DOM may be a determinant for free bases photodegradation in natural waters and thereby deeply influence free bases fates in aquatic environments.
研究领域:
环境科学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Anzhou Yang,Yongping Fu,Fuqiang Huang
Effective phosphorus recovery in natural aquatic ecosystems necessitates the integration of phosphorus adsorbents with appropriate carrier materials to develop functional devices, thereby addressing the challenge of water eutrophication. In this study, we report for the first time that MgLa layered double hydroxide powder was anchored in situ on polyvinyl chloride substrates (PVC@MgLa-LDH) by solvent exchange method, resulting in the formation of composite films with hydrophilic, lightweight and flexible characteristics. Within a phosphorus solution of 100 mg P /L, the adsorption capacity achieved an impressive 66.5 mg P /g, alongside commendable reusability. Notably, comparative assessments revealed that the adsorption sites of MgLa-LDH slightly affected by the PVC substrate. Given their favorable transport and recovery attributes, PVC@MgLa-LDH composite films show significant potential for application in phosphorus recovery initiatives in open aquatic environments. Additionally, this fabrication method offers a promising framework for the development of customized adsorption films targeting various pollutants.
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
危险品化学品经营许可证（带存储）