CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haixiang Jia,Xiaoyan Y. Ma,Yu Lin,Shengjiong Yang,Yali An,Yihan Chen,Xiaochang C. Wang
Carbamazepine (CBZ) and residual chlorine coexist in wastewater discharged from wastewater treatment plants (WWTPs), while the mechanism of their photochemical transformation in the natural aquatic environment is still unclear. In this study, an approach combining experiment and quantum chemical calculation was used to explore the degradation mechanism of CBZ under chlorine/solar irradiation. The degradation of CBZ was not evident during disinfection alone or sunlight irradiation. However, CBZ was rapidly degraded under chlorine/solar irradiation ( k obs = 0.463 min −1 at pH = 8.0). Quenching and probe experiments showed that the efficient removal of CBZ under chlorine/solar irradiation was credited with the production of ·Cl, ·OH, and O 3 , in which ·Cl (61.95%) and ·OH (33.14%) contributed significantly. The reaction mechanism of CBZ degradation was postulated, in conjunction with the identification of degradation products by HPLC/MS analysis and density functional theory . Among them, the primary degradation way was acridine production under the action of ·Cl and ·OH, and the decarboxylation process was the rate-limiting step. In addition, bioassay results indicated that the luminescent bacteria toxicity and genotoxicity of CBZ after chlorine/solar irradiation increased. Based on the identified transformation products and the quantitative structure-activity relationship, the elevated ecotoxicity was attributed to the TP209 and TP179 generated by pathway 1, and then controlling the decarboxylation process by adjusting pH and temperature to reduce the high toxic degradation products were proposed for ecological safety.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 5
·2290-2298
·
IF 2.7
Xuewei Zhang,Jing Ye,Zhigang Ni,Xuerui Yang,Yuefei Ji,Jean-Marc Chovelon,Guangli Xiu,Lei Zhou
Kresoxim-methyl (KM), an extensively used strobilurin fungicide, displays broad-spectrum fungicidal activity. Despite its prevalent application in agriculture and frequent detection in the environment, specific studies on the photolytic fate of KM in natural surface waters are quite limited. To address this, the present study delves into the photochemical transformation of KM under light irradiation using a high-pressure mercury lamp. Photodegradation of KM followed pseudo-first-order kinetics, with a degradation rate constant of 0.067 ± 0.005 h−1, corresponding to a half-life of approximately 10.3 ± 0.7 h, and the quantum yield was estimated to be 6.95 × 10−3. Transient species identification experiments demonstrated the involvement of singlet oxygen (1O2) and singlet (1KM*) and triplet (3KM*) states. Four different photodegradation pathways, i.e., photoisomerization, hydrolysis, hydroxylation, and ether cleavage, were proposed. Toxicity assessments demonstrated that photodegradation effectively reduced the ecotoxicity of KM. Two typical pesticide adjuvants, namely, Tween 20 and sodium dodecylbenzenesulfonate (SDBS), were selected to evaluate their impacts on KM photolysis. While Tween 20 exhibited a remarkable increase in the photodegradation of KM, SDBS showed a concentration dependent behavior, with an inhibitory effect at low concentrations (<200 μM) and promotional effects at higher concentration levels. The present study elucidated the photolytic KM degradation mechanism, as well as its possible inhibition and enhancement, which is of significant importance for evaluating the environmental fate and ecotoxicological risks of KM in sunlit surface waters.
研究领域:
环境科学
·
农药化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 18
·27037-27051
·
IF 0
Sun Hongyu,Bao Qiongli,Chu Yutan,Li Yan,Shi Jiahao,Huang Yizong
Graphene-based material is widely used to remove arsenic from water due to its layered structure with high surface area. Here, we have successfully synthesized Fe-La bimetallic modified graphite sheet materials to more efficiently remove As(III) from aqueous solution. The results showed that Fe-La-graphite sheets (FL-graphite sheets) have a larger specific surface area (194.28 m 2 ·g −1 ) than graphite sheets (2.80 m 2 ·g −1 ). The adsorption capacity of FL-graphite sheets for As(III) was 51.69 mg·g −1 , which was higher than that of graphite sheets (21.91 mg·g −1 ), La-graphite sheets (26.06 mg·g −1 ), and Fe-graphite sheets (40.26 mg·g −1 ). The FL-graphite sheets conformed to the Freundlich and Dubinin–Radushkevich isotherm, and the maximum adsorption capacity was 53.62 mg·g −1 . The removal process obeys intra-particle diffusion and pore diffusion for As(III). The results of batch adsorption experiments and characterization analyses demonstrated that oxidation, ligand exchange, and inner sphere complexation mechanisms involved in the adsorption of FL-graphite sheets to As(III) in comparison with graphite sheets. In addition, electrostatic attraction mechanism was found vital in the adsorption. Ecotoxicity assessment revealed that FL-graphite sheets have little influence on rice germination and growth, but reduced the toxicity of As(III) to rice. Therefore, the FL-graphite sheets have good practical application value in purifying As(III) polluted water with litter ecotoxicity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
Journal of Cleaner Production
·
2018
·
IF 5.651
Hao Zheng,Xia Liu,Guocheng Liu,Xianxiang Luo,Fengmin Li,Zhenyu Wang
Biochar (BC) and activated carbon (AC) amendments have been applied to remediate contaminated sediments because of their benefits in reducing toxicity and/or the bioavailability of contaminants. However, their ecotoxicity to benthic organisms, which are not well understood, should be carefully considered before their practical application. Therefore, a wood-derived BC (WBC) or a coconut shell-derived AC (CAC) was incorporated into a marine sediment at 5% (dw%) to investigate their effects on the growth and nutritional quality of a marine clam ( Meretrix meretrix ). CAC and WBC had no effect on the pH and calcium content of the sediment, but significantly increased the electrical conductivity (EC) and total organic carbon (TOC), and decreased the dissolved organic carbon (DOC). After 28 days of cultivation, WBC reduced the shell growth of the clam by 36.4%, and CAC reduced the soft tissues of the clam by 9.05%. This was probably because WBC and CAC adsorb organic matters and the feeding algae may colonize within their pores, thus, reducing food bioavailability for the clams. Water extracts of CAC and WBC had negligible effects on soft tissue growth, whereas the CAC extract inhibited the growth of clam shells by 57.9%. WBC and CAC had little influence on the nutritional quality of clams, including moisture, crude protein , and crude lipid contents. These findings are helpful to understand the ecotoxicological risks of BC and AC amendments to benthic organisms when used for the remediation of contaminated marine sediments.
研究领域:
环境科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
Toxics
·
2023
·Vol. 11
·期 5
·428
·
IF 4.6
Yanli Man,Tian Sun,Chi Wu,Xingang Liu,Mingyuan He
The risks posed by chemicals in the environment are typically assessed on a substance-by-substance basis, often neglecting the effects of mixtures. This may lead to an underestimation of the actual risk. In our study, we investigated the effects of three commonly used pesticides—imidacloprid (IMI), cycloxaprid (CYC), and tebuconazole (TBZ)—both individually and in combination, using various biomarkers to assess their impact on daphnia. Our findings indicated that the order of toxicity, from highest to lowest, was TBZ, IMI, and CYC, as determined by acute toxicity as well as reproduction. The effects of the ITmix (IMI and TBZ) and CTmix (CYC and TBZ) combinations on immobilization and reproduction were evaluated by MIXTOX, revealing a higher risk of immobilization at low concentrations for ITmix. The effect on reproduction differed depending on the ration of pesticides in the mixture, with synergism observed, which may be caused mainly by IMI. However, CTmix showed antagonism for acute toxicity, with the effect on reproduction depending upon the composition of the mixture. The response surface also exhibited a switch between antagonism and synergism. Additionally, the pesticides extended the body length and inhibited the development period. The activities of superoxide dismutase (SOD) and catalase (CAT) content was also significantly induced at different dosage points in both the single and combination groups, indicating changes in the metabolic capabilities of detoxifying enzymes and target site sensitivity. These findings highlight the need for more attention to be focused on the effects of pesticide mixtures.Keywords:ecotoxicity;pesticide mixture;combined toxicity;MIXTOX;risk assessment
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 POLLUTION
·
2020
·
IF 6.793
Hongwei Yu,Xiaoliang Zhang,Jingwen Hu,Jianfeng Peng,Jiuhui Qu
Much attention is currently paid to microplastic (MP) pollution, particularly in marine systems. There is increasing concern regarding the potential toxicity of MPs to organisms at the physiological and morphological levels. However, little is known about the impact of MPs on aquatic life, despite their ubiquitous presence in freshwater ecosystems . In this study, the aquatic plant Utricularia vulgaris was exposed to 1, 2 and 5 μm polystyrene fluorescent MP particles at concentrations of 15, 70 and 140 mg/L for 7 days. The toxic effects of MPs on the growth rate and morphological and physiological characteristics of U. vulgaris were assessed. The results showed that the relative growth rates and the functional traits of leaves (morphological and photosynthetic) were significantly inhibited at a high concentration of MP particles (140 mg/L) when compared to the control group. The impacts on growth performance were likely due to bioaccumulation of MPs in the bladders, as shown by confocal microscopy. Furthermore, the antioxidative enzyme activities showed that high concentrations of MPs induce high ecotoxicity and oxidative damage to U. vulgaris . Thus, U. vulgaris has the potential to be an excellent bioindicator of MP pollution in freshwater ecosystems and should further be applied in ecological risk assessments of the effects of MPs on higher aquatic plants.
研究领域:
环境科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Sa Wang,Fenglian Cheng,Zhiguo Shao,Bo Wu,Shuhai Guo
This study comprehensively evaluates the ecotoxicity of high-concentration heavy petroleum (HCHP)-contaminated soil before and after thermal desorption (TD) remediation at different temperatures and times. The results showed that the detoxification of contaminated soil was effectively achieved by extending the remediation duration at 400–600 °C. After treatment at 400 °C for 60 min, the toxicological indicators including bioluminescence EC 50 (acute toxicity), seed germination ratio ( Gr ) and plant biomass of Brassica juncea (subacute toxicity), and diversity of the microbial community (chronic toxicity) reached a maximum. The value of the SOS-Induction Factor ( SOSIF ), characterizing genotoxicity was below 1.5, indicating that it was non-toxic. Pearson's correlation analysis illustrated that the water-soluble fraction (WSF), ALK1–3 and ARO1–3 of petroleum hydrocarbons were the primary sources of ecotoxicity. Notably, although the total ratio of petroleum removed from the soil reached 87.26 ± 4.38 %–98.69 ± 1.61 % under high-temperature thermal desorption (HTTD, 500–600 °C), the ecotoxicity was not lower than that at 400 °C. The pyrolysis products of petroleum macromolecules and extreme changes in soil properties were the leading causes of soil ecotoxicity following HTTD. The inconsistency between the removal of petroleum pollutants and ecological health risks reveals the significance of soil ecotoxicological assessments for identifying TD remediation endpoints and process optimization.
研究领域:
环境科学
·
土壤学
·
生态毒理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Jiahuan Li,Xiao Qiu,Shaojie Ren,Hao Liu,Shan Zhao,Zhonghua Tong,Yunkun Wang
As emerging contaminants, antibiotic and antibiotic resistance genes (ARGs) in wastewater effluent induce and increase the risk of antibiotic resistance spreading in the environment. Herein, we fabricated a series of polyaniline/carbon nanotube-assisted electroactive membranes (PANI/CNT-EMs) to remove low-concentration antibiotics (i.e., sulfamethoxazole, SMX), antibiotic-resistant bacteria (ARB), and ARGs, thus reducing ecotoxicity and antibiotic resistance pollution in wastewater effluent. The PANI/CNT-EMs possess excellent electrochemical properties with a uniform and stable structure. Compared with pristine EMs, the PANI/CNT-EMs effectively enhanced SMX degradation and substantially lessened the ecotoxicity of the degradation products. The PANI/CNT-EMs show higher inactivation ability in intercepted ARB and significant degradation of both intracellular and extracellular ARGs (iARGs and eARGs) during wastewater effluent electrofiltration under a low voltage of +2 V. More importantly, the reduced integron (i.e., intI1 ) abundance and ARG transfer frequency further demonstrated that the PANI/CNT-EMs are more conducive to controlling the spread of antibiotic resistance. Furthermore, compared with pristine EMs, the antifouling property of PANI/CNT-EMs is improved by 42.1% during wastewater effluent treatment. Overall, these findings offer a promising approach for antibiotic resistance control in wastewater effluent treatment.
研究领域:
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2024
·
IF 2.4
Qin Jisong,Cheng Zhengzai,Djouonkep Lesly Dasilva Wandji,Gauthier Mario
To meet polymeric material sustainability requirements of the modern polymer industry, a novel diphenyl-based monomer, dimethyl 2,2’-((carbonylbis(4,1-phenylene))bis(oxy))diacetate (DPBD), was prepared from 4,4'-dixydroxybenzophenone, derived from potentially bio-sourced 4-hydroxybenzoic acid. The diester monomer DPBD was polymerized with either 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, or 1,4-cyclohexanedimethanol as aliphatic diols to afford aliphatic/aromatic copolyesters (P 1 –P 4 ). The copolyesters were characterized using gel permeation chromatography, differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, and tensile testing, as well as biodegradation and earthworm acute toxicity assays. The effects of diol carbon chain length and cyclic diol monomers on polyester properties were investigated. From the results, the weight-average molecular weight (M w ) of the polyesters ranged from 37.5 to 45.5 kg/mol, glass transition temperature (T g ) ranged from 65 to 78 °C, initial thermal decomposition temperature (T d,5% ) varied from 324 to 353 °C, yield strength varied from 45 to 56 MPa, and elongation-at-break ranged from 215 to 290%. The properties can be adjusted by tuning the monomer structure, which induced a degradation rate of up to 4.6% after incubation in soil for 30 weeks, in contrast to poly(ethylene terephthalate) (PET) which showed no degradation under the same conditions. The ecotoxicity of the polyesters to earthworms remained low, even at high concentration polymer concentration tested (4000 mg/kg soil), the survival rate was above 82%. Therefore, polyesters offer a good combination of structure-to-property serving as potential alternatives to petroleum-based materials. Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2025
·Vol. 17
·期 9
·4127
·
IF 3.3
Xiaoli Du,Wenqian Sun,Xiaolu Liu,Zhongwen Chi,Huihui Sheng,Fei Liu
Microbial remediation is an eco-friendly and cost-effective method for treating organic-contaminated soil, essential for sustainable land use due to its minimal secondary pollution and operational simplicity. However, during the degradation of polycyclic aromatic hydrocarbons (PAHs), the formation of polar or toxic intermediate metabolites can lead to unpredictable ecotoxicological impacts. In this study, we investigated the effects of the microbial remediation of organic-contaminated soils on wheat seedling growth and physiology, and evaluated soil ecotoxicity throughout the remediation process. The results showed that the concentrations of benzo[a]anthracene (BaA) and benzo[a]pyrene (BaP) decreased by 70.4% and 49.9%, respectively, following microbial degradation, with the degradation process following a second-order kinetic model. Despite the reduction in pollutants, soil toxicity increased from days 10 to 20, peaked on day 20, and then gradually decreased, but it remained elevated throughout the remediation process. Increased ecotoxicity inhibited wheat seed germination, seedling growth, and chlorophyll content, induced oxidative stress, and suppressed soil enzyme activity. Gas chromatography–mass spectrometry (GC-MS) analysis identified toxic intermediate metabolites as the primary contributors to enhanced ecotoxicity. Wheat seed germination potential, plant height, root length, and superoxide dismutase (SOD) and catalase (CAT) activity in roots can effectively indicate soil ecotoxicity throughout the microbial remediation process. These parameters facilitate the optimization of remediation strategies to ensure restored soil functionality and long-term ecological sustainability.
研究领域:
环境科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Shaofeng Yuan,Changjian Li,Yichi Zhang,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao
The removal of pesticide residues in food by ultrasound has attracted more attention in recent years, and the formation of intermediate products may have some profound effects on the toxicity of treated food. Therefore, degradation of parathion methyl (PM) in bovine milk by ultrasonic treatment was studied in this paper. Results showed that the ultrasonic intensity and the initial concentration of PM had a significant effect on the degradation rate of PM (P < 0.05). The maximum degradation rate of PM was 97.10%. Three transformation products were identified through UPLC-QTOF/MS analysis, and the oxidation pathway was proposed as the consequence of ultrasonication. Furthermore, according to Quantitative Structure Activity Relationship (QSAR) model prediction, the ecotoxicity of the transformation products may be higher than that of PM. These findings showed that although ultrasonic treatment can effectively degrade pesticide residues in food, it may also generate transformation products with the higher ecotoxicity.
研究领域:
食品科学
·
环境毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Qingze Chen,Runliang Zhu,Yanping Zhu,Jing Liu,Lifang Zhu,Lingya Ma,Meng Chen
The environmental behaviors and potential ecotoxicity of carbon nanomaterials , such as fullerene and its derivatives, are gaining ever-increasing concerns at present. This work attempts to develop an adsorbent for the effective removal of polyhydroxy fullerene (PHF) from aqueous solution, which was synthesized by modifying montmorillonite (Mt) with a branched polymer polyethylenimine (PEI). The adsorption results showed that the obtained adsorbent ( i.e. , PEI-Mt) could effectively remove PHF over a wide range of solution pH; both the electrostatic attraction and hydrogen-bond interaction between PHF and PEI-Mt contributed to the strong adsorption. Decreasing solution pH and rising PEI loading amount on Mt could both increase the adsorption amounts of PHF on PEI-Mt. The adsorption isotherms could be well fitted with the Langmuir model, and the calculated maximum adsorption value of PHF on 10%PEI-Mt reached ~ 213 mg/g, much higher than that on the original Mt (~ 16 mg/g). The adsorbents after PHF adsorption were further characterized using Fourier transform infrared spectroscopy , X-ray diffraction, and transmission electron microscopy . The results suggested that the adsorbed PHF primarily existed on the outer surfaces of PEI-Mt. This work showed that PEI-Mt can be a potentially efficient adsorbent for the removal of PHF from aqueous solution.
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）