Xufei Liu, Lin Zhang, Yaqing Du, Xue Yang, Xuefei He, Jiasen Zhang, Bokun Jia
{"title":"Microplastics in China’s surface water systems: Distribution, driving forces and ecological risk","authors":"Xufei Liu, Lin Zhang, Yaqing Du, Xue Yang, Xuefei He, Jiasen Zhang, Bokun Jia","doi":"10.1016/j.jhazmat.2024.136864","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136864","url":null,"abstract":"Comprehensively understanding the distribution, driving forces and ecological risk of microplastics (MPs) in China’s surface water systems is crucial for future prevention and control of MPs pollution, particularly in the context of regional differences. Nevertheless, traditionally localized investigation and the limited MPs data availability hinder more comprehensive estimation of MPs pollution in surface water systems of China. This study presents a robust dataset, which consists of 14285 samples from 32 provincial districts, describing the MPs pollution characteristics using a data mining method combined with a machine learning model. The results show that the developed model has high accuracy in predicting the abundance, colors, shapes, and polymer types of MPs, with the coefficient of determination (R<sup>2</sup>) ranging from 0.825 to 0.978. MPs abundance varied greatly in China’s surface water systems, ranging over 1–5 orders of magnitude due to the complex influence of anthropogenic activities and natural conditions. Human activities and natural conditions mutually impact the dynamics of MPs in China’s surface water systems. Watersheds in almost all provinces of China are contaminated by high and extremely high ecological risk levels, highlighting the urgency for sustainable MPs management.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"41 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Optimized Mn cycle enhanced synchronous removal of nitrate and antibiotics driven by manganese oxides/solid carbon composites: Microbiota assembly patterns and electron transport","authors":"Lixia Jia, Qi Zhou, Weizhong Wu","doi":"10.1016/j.jhazmat.2024.136875","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136875","url":null,"abstract":"The reactive substance consisting manganese oxides (MnOx) and solid carbon have been reported to be effective in polishing secondary wastewater; however, the treatment characteristics and mechanism remains limited. In this study, MnOx/carbon (Mn-C) composites were applied in biofilters to evaluate simultaneous removal of nitrate and sulfamethoxazole (SMX), with the single carbon composites as control. Results showed that the effluent concentrations of NO<sub>3</sub><sup>-</sup>-N and SMX were below 2.87<!-- --> <!-- -->mg<!-- --> <!-- -->L<sup>-1</sup> and 7.97<!-- --> <!-- -->μg<!-- --> <!-- -->L<sup>-1</sup> under hydraulic retention time (HRT) of 6<!-- --> <!-- -->h. The intermittent aeration optimized Mn cycle with treatment performance improved under lower HRT and Mn(II) accumulation decreased. Mn-C composites could reduce the emission of N<sub>2</sub>O, CO<sub>2</sub> and CH<sub>4</sub>. The dominant genera gradually evolved from fermentation to glycogen aggregation, and from heterotrophic/sulfur autotrophic to heterotrophic denitrifiers by intracellular substance and manganese autotrophic/heterotrophic bacteria. Microbial network analysis indicated higher antagonism, lower modularity and shorter average path among microbes in Mn-C biofilters, which highlighted microbial differentiation and faster electron transfer. Improved functions of denitrification and Mn respiration, and the increasing genes encoding electron transfer chain, including NADH dehydrogenase, Cytc and ubiquinone, further elucidated the superiority of Mn-C composites. These results improved our understanding of Mn-C composites application in low-carbon wastewater treatment.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"7 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kai Hu, Honghong Lyu, Zhenzhong Hu, Boxiong Shen, Jingchun Tang
{"title":"Three-dimensionally structured MoS2@biochar breaks through the bottleneck in antibiotic wastewater treatment: greater efficiency and self-motivated oxidation pathway","authors":"Kai Hu, Honghong Lyu, Zhenzhong Hu, Boxiong Shen, Jingchun Tang","doi":"10.1016/j.jhazmat.2024.136871","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136871","url":null,"abstract":"Two-dimensional (2D) MoS<sub>2</sub> has been widely used to remove antibiotic. However, low selectivity for antibiotic pollutants, dependence on applied energy and oxidant, and secondary contamination are still the bottlenecks of this system for treating antibiotic wastewater. In this study, we proposed a three-dimensional (3D) material (3MoS<sub>2</sub>/BMBC@MF) based on MoS<sub>2</sub> and biochar with melamine sponge as the backbone. Compared with the 2D material (MoS<sub>2</sub>/BMBC), 3MoS<sub>2</sub>/BMBC@MF performed significantly better in enrofloxacin (ENR) removal, with an increase in the removal degree from 60.8% to 88.1%, and acted mainly through the degradation pathway rather than relying solely on the adsorption effect. It was shown that the direct oxidation process (DOP) behind the 3D materials is the key to the self-activated oxidation pathway. The three-dimensional structure enhances the generation and transfer pathways of persistent free radicals (PFRs) and electrons, realizing a multi-dimensional activation mechanism through its unique three-dimensional network, which greatly improves the redox capacity of the material. Upon exposure to pollutants, 3MoS<sub>2</sub>/BMBC@MF generates carbon-centered radicals of PFRs, which degrade ENR through mediated electron transfer. Coupled with the three-dimensional structure that contributes to the homogeneous dispersion of the active substances, dense steric active centers are formed in the grid skeleton by redox cycling of Mo ions to degrade antibiotics via DOP. Meanwhile, 3MoS<sub>2</sub>/BMBC@MF possesses good recyclability and maintains high efficiency in recycling. The structural design of this material not only enhances the removal efficiency and reduces the environmental impact, but also provides new potentials and solutions for practical water treatment of antibiotic contaminants.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"42 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unraveling the dual roles of dissolved organic matter on the photodegradation of aquatic contaminants: Molecular weight- and type-dependent heterogeneities","authors":"Chongsen Duan, Fei Liu, Jikang You, Guoqiang Zhao, Ming Kong, Xiaodong Hu, Zhiyuan Wang, Huacheng Xu","doi":"10.1016/j.jhazmat.2024.136879","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136879","url":null,"abstract":"Dissolved organic matter (DOM) in natural waters can regulate the behaviors and fates of aquatic contaminants, while the specific effects on contaminant attenuation are highly dependent on its inherent properties [e.g., molecular weights (MW) and types]. In this study, the algae-derived organic matter (AOM) and humic acid (HA) were selected as the representative autochthonous and allochthonous DOMs, which were further fractionated into low MW (LMW, <1<!-- --> <!-- -->kDa) and high MW (HMW, <1<!-- --> <!-- -->kDa~0.45 μm) fractions to evaluate the MW- and type-dependent heterogeneities in the photodegradation of sulfadiazine (SDZ). Results showed that presence of bulk AOM promoted SDZ photodegradation by 2.45 folds while those of the bulk HA inhibited SDZ photodegradation by 1.70 folds due to the higher light screening effects and phenolic antioxidant concentrations. Further analysis revealed obvious MW-dependent heterogeneities that, regardless of DOM types, the HMW-fraction always inhibited SDZ photodegradation while the LMW-fraction promoted photodegradation efficiencies owing to higher carbonyl contents and electron transfer capabilities. In addition, the MW-dependent heterogeneities within DOM samples resulted in different photodegradation pathways and Ecological Structure-Activity Relationship (ECOSAR) calculation showed that most of photodegradation products in the LMW-fraction were more ecotoxicity than the parent SDZ while those in the HMW-fraction exhibited alleviated ecotoxicity. This study indicated that the dual roles of aquatic DOMs on contaminant photodegradation were MW- and type-dependent, and detailed structural composition analysis on DOM matrix was needed for a better assessment of the behaviors and fates of contaminants in aquatic ecosystems.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"41 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Redox potentials of sulfonamide antibiotics mediating the electron transfer process in single-atom Cu catalyst/peroxymonosulfate system: Selective removal mechanisms for sulfonamides","authors":"Xinyuan Wang, Taozhen Li, Zihao Fan, Pijun Duan, Lei Wang, Jingwen Pan, Baoyu Gao","doi":"10.1016/j.jhazmat.2024.136880","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136880","url":null,"abstract":"The oxidative behaviors of target pollutants in single-atom catalysts-activated peroxymonosulfate (SACs/PMS) system has mostly been studied from the loaded metal and coordination structure of SACs. However, the origin of the altered degradation behavior caused by the specific properties of pollutants has been neglected. Herein, Cu atoms coordinated with four N atoms embedded in biochar (Cu<sub>SA30</sub>@C) was prepared to establish the relationship between the selective degradation behavior of sulfonamide antibiotics in Cu<sub>SA30</sub>@C/PMS system and their own properties. Four representative sulfonamide pollutants (SAs) were selected and their redox potentials were determined by measuring half-wave potentials (φ<sub>1/2</sub>). Results showed that a good correlation (R<sup>2</sup>=0.916) between the φ<sub>1/2</sub> values of different SAs and their corresponding degradation rate constants (k<sub>obs</sub>) in Cu<sub>SA30</sub>@C/PMS system was established. Additionally, the φ<sub>1/2</sub> values of SAs correlate well with the energy gap between SAs and the Cu<sub>SA30</sub>@C/PMS complexes, further proving that the redox potential of SAs played a crucial role for electron-transfer oxidation in Cu<sub>SA30</sub>@C/PMS system. This work contributes to the understanding of the selective degradation activity of sulfonamide antibiotics in Fenton-like systems from the perspective of pollutants properties, and provides new ideas for the efficient treatment of sulfonamide antibiotic wastewater.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"19 1 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Picheng Gong, Cuishuang Jiang, Gang Wang, Tingting Yu, Jian Xiao, Yangfan Du, Xuan Song
{"title":"Characteristics concerning the evolution of dissolved organic matter and dynamics of bacterial community during continuous thermophilic composting of oxytetracycline fermentation residue","authors":"Picheng Gong, Cuishuang Jiang, Gang Wang, Tingting Yu, Jian Xiao, Yangfan Du, Xuan Song","doi":"10.1016/j.jhazmat.2024.136877","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136877","url":null,"abstract":"Continuous thermophilic composting (CTC) is a potential technique to recycle oxytetracycline fermentation residue (OFR) with the extremely high level of antibiotics but is still not explored. To investigate the efficiency of CTC on treating OFR, the differences between this technique and conventional composting in the evolution of dissolved organic matter and dynamics of bacterial community were compared. The higher degradation efficiency of oxytetracycline (OTC) was obtained in CTC than conventional composting. The transformation of organic matter occurred faster and the maturity degree of compost product was higher in CTC than conventional composting. Compared with conventional composting, CTC increased the bacterial diversity and screened some functional microorganisms related to OTC degradation and organic matter transformation. The results indicate that CTC is a precise strategy for efficiently recycling OFR as soil amendment.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"29 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdul Waheed, Zhang Qin, Xu Hailiang, Dou Haitao, Murad Muhammad, Aishajiang Aili, Mohammed O. Alshaharni
{"title":"Mitigation of Cadmium Stress by Salicylic Acid: Physiological and Biochemical Responses in NM-2006, NM-92, and Mash-88 Mung Bean Varieties","authors":"Abdul Waheed, Zhang Qin, Xu Hailiang, Dou Haitao, Murad Muhammad, Aishajiang Aili, Mohammed O. Alshaharni","doi":"10.1016/j.jhazmat.2024.136878","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136878","url":null,"abstract":"Cadmium (Cd) is a major environmental pollutant that adversely affects plant growth and productivity, creating a need for effective mitigation strategies. This study aims to evaluate the impact of salicylic acid (SA) priming on the physio-biochemical characteristics of three mung bean varieties (<em>Vigna radiata</em> L.), namely NM-2006, NM-92, and Mash-88, under Cd stress. To achieve this, the mung bean varieties were subjected to Cd stress with and without SA priming, and their growth, chlorophyll content, protein levels, and oxidative stress markers were analyzed. Results showed significant reductions in growth, chlorophyll, and protein contents, alongside increased oxidative stress markers such as hydrogen peroxide and malondialdehyde under Cd stress. Moreover, Cd exposure also led to higher levels of proline, glycine betaine, and total soluble sugars. However, SA priming alleviated these adverse effects by enhancing growth, chlorophyll fluorescence, and protein content while reducing oxidative damage by upregulating the enzymatic antioxidant mechanism. Additionally, SA priming also modulated phytohormone levels, specifically increasing abscisic acid and jasmonic acid while decreasing ethylene. Comparative analysis revealed that NM-2006 suffered the most from Cd stress, NM-92 showed a better response to SA priming, and Mash-88 exhibited the least damage and greatest benefit from SA priming. These findings suggest that SA is an effective protective agent that enhances stress tolerance in mung bean varieties, offering valuable insights for improving crop resilience in contaminated environments.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"43 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaofeng Lin, Chenghao Liu, Qiaowen Lei, Xinru Nan, Yunxiao Zhu, Jing Liao, Zhizhi Du, Chenyi Ye, Yixian Xiong, Min Yang, Xiaojun Fang, Yan Luo, Qitong Huang
{"title":"A novel ratiometric electrochemical aptasensor based on graphene quantum dots/Cu-MOF nanocomposite for the on-site determination of Staphylococcus aureus","authors":"Xiaofeng Lin, Chenghao Liu, Qiaowen Lei, Xinru Nan, Yunxiao Zhu, Jing Liao, Zhizhi Du, Chenyi Ye, Yixian Xiong, Min Yang, Xiaojun Fang, Yan Luo, Qitong Huang","doi":"10.1016/j.jhazmat.2024.136845","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136845","url":null,"abstract":"The sensitive detection of <em>Staphylococcus aureus</em> (<em>S. aureus</em>) holds great practical importance for ensuring public health and food safety. In this study, a sensitivity and stability ratiometric electrochemical aptasensor using graphene quantum dots/[Cu<sub>2.5</sub> (benzotriazole-5-COO)<sub>1.5</sub> (benzotriazole-5-COOH)<sub>0.5</sub> (μ-Cl)<sub>0.5</sub> (μ<sub>3</sub>-OH)-(H<sub>2</sub>O)]·3H<sub>2</sub>O nanocomposite (GQDs/Cu-MOF) was constructed for <em>S. aureus</em> detection. The GQDs enhanced the sensitivity of the electrochemical aptasensor due to their excellent conductivity and provided stability through their abundant carboxyl groups. The Cu-MOF, possessing electrical activity, not only enhanced the performance of the electrochemical aptasensor but also served as a signal label. The single-stranded DNA1 (S1) was immobilized on the surface of a GQDs/Cu-MOF/screen-printed carbon electrode (S1/GQDs/Cu-MOF/SPCE) as the sensing interface. Subsequently, the S1/GQDs/Cu-MOF/SPCE was hybridized with the probe DNA-ferrocene (S2-Fc), resulting in the generation of electrochemical signals from Cu-MOF (<em>I</em><sub><em>Cu-MOF</em></sub>) and S2-ferrocene (<em>I</em><sub><em>S2-FC</em></sub>) within the system. However, the electron transfer performance of DNA at the sensing interface was compromised, leading to a reduction in the <em>I</em><sub><em>Cu-MOF</em></sub>. When <em>S. aureus</em> was present in the system, S2-Fc reacted with it and detached from the sensing surface, resulting in a gradual decrease in <em>I</em><sub><em>S2-FC</em></sub> and an increase in <em>I</em><sub><em>Cu-MOF</em></sub>. Then a ratiometric electrochemical aptasensor was established for <em>S. aureus</em> detection with remarkable sensitivity (0.97 CFU·mL<sup>-1</sup>), excellent stability, and a broad linear range. Furthermore, the aptasensor was successfully applied to detect <em>S. aureus</em> in tap water, milk, <em>Lonicera japonica</em>, urine, and Zhangjiang River. Additionally, this aptasensor design can be adapted for the detection of other foodborne pathogens, which indicates that the design scheme of the aptasensor has good universality.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"9 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuyi Yu, Yufei Qin, Yubo Zhong, Nan Wang, Xiaolei Xu, Chunli Kang
{"title":"Freezing-driven reduction of chromium(Ⅵ) in ice under solar light without external reductants","authors":"Shuyi Yu, Yufei Qin, Yubo Zhong, Nan Wang, Xiaolei Xu, Chunli Kang","doi":"10.1016/j.jhazmat.2024.136798","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136798","url":null,"abstract":"This study systematically investigated the direct photoreduction of Cr(Ⅵ) in ice under simulated sunlight without external reductants. It was shown that the Cr(Ⅵ) photoreduction was observed only in ice at near-neutral pH values but not in aqueous solutions. Cr(Ⅵ) at an initial concentration of 10 μM was efficiently reduced by 75.8 % in ice after 180 min of illumination (λ > 290 nm). Low-temperature EPR spectra revealed the formation of the final product Cr(Ⅲ) and the intermediates Cr(Ⅳ) and Cr(Ⅴ). Based on UV–vis absorption spectra, Raman spectra, EPR spectra, and the DFT calculation, the mechanism of structural catalysis of the ice surface was proposed. Various dissolved organic matters significantly promoted the Cr(Ⅵ) photoreduction in ice under sunlight; the outdoor experiment confirmed the feasibility of the process occurring in the natural environment. This research revealed a new transformation pathway for Cr(Ⅵ) in cold regions.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"20 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kashif Khan, Rayyan Khan, Zhou Liu, Shahid Ali, Muhammad Asad Naseer, Muhammad Ali Shah, Haseeb Ahmad, Xun Bo Zhou
{"title":"Melatonin mitigates Nickel oxide nanoparticles induced phytotoxicity in soybean by reducing metal accumulation, enhancing antioxidant defense and promoting nitrogen assimilation","authors":"Kashif Khan, Rayyan Khan, Zhou Liu, Shahid Ali, Muhammad Asad Naseer, Muhammad Ali Shah, Haseeb Ahmad, Xun Bo Zhou","doi":"10.1016/j.jhazmat.2024.136861","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2024.136861","url":null,"abstract":"Heavy metals like nickel (Ni) from anthropogenic activities damage plant growth, posing challenges to agriculture. Melatonin (ME), a potent bio-regulator, has shown promise in alleviating stress induced by heavy metals. However, the mechanisms through which ME alleviates NiO-NPs phytotoxicity remain unclear. Our results showed that NiO-NPs reduced root and shoot length as well as biomass by 14%, 12%, 21%, and 14%, respectively, compared to control. However, the combined effect of ME (75<!-- --> <!-- -->µM) and NiO-NPs (100<!-- --> <!-- -->mg<!-- --> <!-- -->kg<sup>−1</sup>) significantly increased these parameters by 12-28% compared to NiO-NPs. Moreover, co-exposure of ME (75<!-- --> <!-- -->µM) and NiO-NPs notably decreased the Ni contents in root and shoot compared to NiO-NPs treatment. This reduction was associated with enhanced levels of phytohormones (ABA, JA, SA, and GA4) and secondary metabolite production, showing a 12–32% improvement compared to NiO-NPs alone. ME further enhanced SOD, POD, CAT, and APX activities by 14-21% while reducing oxidative enzymes (MDA, H<sub>2</sub>O<sub>2</sub>) by 17-21%. Similarly, ME (75<!-- --> <!-- -->µM) upregulated POD, CAT, and APX gene expression by 1.33 to 1.6-fold, while SOD was downregulated. Additionally, ME improved nodule formation (14%), N<sub>2</sub> content (19-21%), N<sub>2</sub>-assimilation enzymes (UE, NR, GS, GOGAT, GDH) by 19-29%, and nutrient balance in roots (16-24%) and shoots (19-25%). These findings provide insights into ME’s role in mitigating NiO-NPs toxicity and enhancing N<sub>2</sub>-acquisition in soybeans, offering strategies for sustainable agriculture.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"10 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142816238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}