检索结果-内蒙古大学图书馆

Deciphering environmental factors influencing phytoplankton community structure in a polluted urban river

Journal of environmental Sciences 2025年第2期148卷 375-386页

作者： Xiaxia Li Kai Chen Chao Wang Tianyu Zhuo Hongtao Li Yong Wu Xiaohui Lei Ming Li Bin Chen Beibei Chai School of Water Conservancy and Hydroelectric Power Hebei University of EngineeringHandan 056038China Collaborative Innovation Center for Intelligent Regulation and Comprehensive Management of Water Resources School of Water Conservancy and HydroelectricHebei University of EngineeringHandan 056038China Hebei Key Laboratory of Intelligent Water Conservancy Hebei University of EngineeringHandan 056038China Tianjin Water Group Binhai Water Co. Ltd.Tianjin 300308China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China Chengdu University of Technology Chengdu 610059China College of Natural Resources and Environment Northwest A&F UniversityYangling 712100China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China

Tuojiang River Basin is a first-class tributary of the upper reaches of the Yangtze River—which is the longest river in *** phytoplankton are sensitive indicators of trophic changes inwater bodies,characterizing phytoplankton communities and their growth influencing factors in polluted urban rivers can provide new ideas for pollution ***,we used direct microscopic count and environmental DNA(eDNA)metabarcoding methods to investigate phytoplankton community structure in Tuojiang River Basin(Chengdu,Sichuan Province,China).The association between phytoplankton community structure and water environmental factors was evaluated by Mantel *** environmental monitoring data were used to pinpoint major factors that influenced phytoplankton growth based on structural equation *** the phylum level,the dominant phytoplankton taxa identified by the conventional microscopic method mainly belonged to Bacillariophyta,Chlorophyta,and Cyanophyta,in contrast with Chlorophyta,Dinophyceae,and Bacillariophyta identified by eDNA ***α-diversity analysis,eDNA metabarcoding detected greater species diversity and achieved higher precision than the microscopic *** growth was largely limited by phosphorus based on the nitrogen-to-phosphorus ratios>16:1 in all water *** analysis and structural equation modeling also confirmed that the nitrogen-to-phosphorus ratio was the principal factor influencing phytoplankton *** results could be useful for implementing comprehensive management of the river basin *** is recommended to control the discharge of point-and surface-source pollutants and the concentration of dissolved oxygen in areas with excessive nutrients(e.g.,Jianyang-Ziyang).Algae monitoring techniques and removal strategies should be improved in 201 Hospital,Hongrihe Bridge and Colmar Town areas.

关键词： environmental DNA Microscopic count Phytoplankton growth Structural equation modeling Tuojiang River Basin

来源：评论

学校读者我要写书评

暂无评论

Improved Mechanical Strength and Adsorption Capacity of Anion Exchange Resin by Poly (Acrylic Acid) /Phenolic Interpenetrating Polymer Networks

SSRN

引用

SSRN 2022年

作者： Zhong, Kaiwen Yang, Hongyu Shuang, Chendong Zhang, Guang Chen, Dong Li, Aimin State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Polyacrylic anion exchange resin (AER) is effective in removing many contaminants in water, but their poor mechanical strength limits their industrial application. In this study, AER-1 with poly (acrylic acid) /phenolic interpenetrating polymer networks was prepared under acidic conditions, and the resin was characterized and evaluated for its adsorption performance. The sphericity after attrition of AER-1 was 97.5%, while the AER was only 57.1%. This improved mechanical strength could be partially attributed to hydrogen bonds. Moreover, the increased pore volume and average pore size results in the enhanced adsorption amount from 0.22 mmol/g to 0.26 mmol/g at equilibrium with 0.05 g resin in 100 mL of ibuprofen solution (0.15 mM). An increasing kinetic constant k1 from 0.024 to 0.033 can be obtained from the pseudo-first order kinetic fitting (R2 > 0.98). Compared with AER-1, AER-2 synthesized under alkaline conditions shows a less improved performance in mechanical strength and pore structure. The Langmuir adsorption isotherm model (R2 >0.98) is more consistent with the experimental data, indicating monolayer adsorption on a homogeneous surface. Small molecule acidic organics are more competitive due to the expansion of resin pore channels. Gallic acid (80 mg/L) lowers the adsorption capacity by 64.3%, while humic acid only produces a 10% reduction in adsorption capacity because of pore exclusion. In ten adsorption-regeneration cycle experiments, AER showed no decrease in adsorption capacity. © 2022, The Authors. All rights reserved.

关键词： Pore structure

来源：评论

学校读者我要写书评

暂无评论

Solvent-free mechanochemical mild oxidation method to enhance adsorption properties of chitosan

引用

Frontiers of environmental Science & Engineering 2021年第6期15卷 353-366页

作者： Mohammadtaghi Vakili Wen Qiu Giovanni Cagnetta Jun Huang Gang Yu Green Intelligence Environmental School Yangtze Normal UniversityChongqing 408100China State Key Joint Laboratory of Environment Simulation and Pollution Control(SKJLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)School of EnvironmentTsinghua UniversityBeijing 100084China

Oxidation has been profitably utilized to improve some properties of ***,only solventbased oxidation procedures have been proposed so far,which are hardly feasible at industrial scale in an economic way because of product recovery *** this study,a solvent-free,rapid,and effective oxidation method is *** is based on direct solid-state reaction between chitosan and oxidant powder in a mechanochemical *** prove that by short high energy ball milling(<3 h)it is possible to achieve diverse physicochemical modifications employing different *** from polysaccharidic chain shortening,persulfate provokes high amorphization and induces formation of ketonic groups;percarbonate heightens deacetylation degree,preserving in part crystallinity;calcium peroxide merely deprotonates amino groups and increases amorphization *** tests with the azo-dye reactive red 2 show that adsorption capacity of chitosan co-milled with persulfate(974 mg/g milled product),which is the best performing adsorbent,is twice that of pristine chitosan,while adsorption rate is outstandingly boosted(125 times).

关键词： Chitosan High energy ball milling Mechanochemistry Oxidation

来源：评论

学校读者我要写书评

暂无评论

Construction of an Efficient Synergistic Catalytic System Using Dbd Plasma and Fe-Tio2/Rgo/Hcp Catalytic Coating for Ofloxacin Removal

SSRN

引用

SSRN 2024年

作者： Zhao, Yimo Zheng, Lijiao Chen, Yongyang Liu, Yuan Huang, Shimeng Li, Shanping Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China

Fe-TiO2/rGO/honeycomb ceramic plate (Fe-TiO2/rGO/HCP) catalytic coating assisted dielectric barrier discharge (DBD) plasma has successfully constructed an efficient synergistic catalytic system. The catalyst coating was comprehensively characterized, and its structural and morphological characteristics, chemical bond state, optical properties, and catalytic activity were systematically analyzed. The results show that by doping Fe and graphene in TiO2, the catalytic performance of TiO2 can be enhanced by refining its grains and increasing the specific surface area. Ofloxacin (OFLX) was the target pollutant to evaluate the catalytic activity. The effects of different initial conditions (initial pH value, electrolyte concentration, current density, etc.) on the degradation of OFLX were analyzed. Compared with the single DBD plasma system, the catalytic ability of the constructed synergistic catalytic system was significantly improved. Under the optimal initial conditions, the Fe-rGO-TiO2-DBD synergistic system achieved a 99.98% OFLX degradation rate and enhanced energy output after 60 minutes of reaction. The measurements of liquid H2O2 and O3 in the system and free radical scavenging experiments proved that the synergistic method can increase the production of active substances. In addition, the possible OFLX degradation pathways and intermediates were speculated by LC-MS analysis and theoretical calculation. Comprehensive toxicity analysis showed that the toxicity of intermediate products led to a downward trend. Finally, the comprehensive mechanism of DBD synergistic Fe-rGO-TiO2 catalytic degradation of OFLX was summarized. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Adhesion between nanobubbles and fine cassiterite particles

引用

International Journal of Mining Science and Technology 2023年第4期33卷 503-509页

作者： Liuyi Ren Zheyi Zhang Weineng Zeng Yimin Zhang School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan 430070China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan 430081China

Adhesion is an important process of particle-bubble interaction in fine particle(-10μm)*** paper studied the adhesion process and mechanism between nanobubbles and fine cassiterite particles by using a high-speed camera,atomic force microscope(AFM),adsorption capacity tests,and induction time *** being pretreated with nanobubbles(NBs)water,fine cassiterite particles flotation tests were carried out using caprylhydroxamic acid(CHA)as a *** results showed that NBs can improve the recovery and flotation rate of fine cassiterite while decreasing the collector *** adsorption capacity test indicated that the cassiterite treated with NBs had lower demand for collector *** AFM imaging results further demonstrate that NBs could reduce the adsorption of CHA on the surface of *** NBs played a part of the role of collector,it can improve the flotation effect while reducing the amount of *** induction time test and the high-speed camera observation test showed that NBs promoted the attachment between bubbles and cassiterite *** the other hand,NBs agglomerate cassiterite particles,increasing the probability of particles colliding with bubbles.

关键词： Nanobubbles Cassiterite Flotation Caprylhydroxamic acid

来源：评论

学校读者我要写书评

暂无评论

Deciphering the Roles of Diketone-Derived Defects on Graphite Carbon Nitride in Boosted Photocatalytic Production of H2o2

SSRN

引用

SSRN 2022年

作者： Yang, Jianghua Ji, Zewen Zhang, Shujuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The fabrication and identification of defects for enhanced photocatalytic production of hydrogen peroxide (H2O2) by carbon nitride (CN) remain challenging, because of the multiple pathways involved in production of H2O2. Here, a simple route was employed to generate defects in CN by employing acetylacetone (AcAc) as a modifying precursor. In this way, modified CN with dual defects (-OH and C doping) was successfully fabricated by tuning the ratio of AcAc to urea (AxCN). The photocatalytic yield of H2O2 was up to 3629 μmol·g-1·h-1. The ultrahigh H2O2 production was attributable to the synergistic roles of -OH group and C defect. The C defects enhanced the anchoring of dioxygen, while -OH group facilitated the diffusion of charge carriers. As a result, the selectivity of H2O2 production was increased from 60% (CN) to 85% (A0.05CN). This work provides new insight into green production of H2O2. © 2022, The Authors. All rights reserved.

关键词： Carbon nitride

来源：评论

学校读者我要写书评

暂无评论

Recycling Phosphorus from Waste in China: Recycling Methods and Their environmental and resource Consequences

SSRN

引用

SSRN 2022年

作者： Liu, Xuewei Zhang, You Yuan, Zengwei State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Recycling phosphorus (P) from waste is an effective way to alleviate resource and environmental pollution due to excessive phosphate consumption. In order to better understand the feedback of phosphorus cycle to waste recycling methods, a P waste feedback model was built to predict P waste generation, recycling, loss patterns and phosphate consumption in China under several scenarios. Three recycling methods, waste as fertilizer, waste as feed and waste as industrial material, were analyzed for each scenario. The results show that dietary change causes sharp increase in P loss and phosphate consumption, but the integrated measures can offset the increase. ‘Waste as fertilizer’ has greater reduction in phosphate consumption, ‘waste as feed’ method effectively mitigates P loss, and 'waste as material' method is less effective. Integrated measure with ‘waste as fertilizer’ method minimizes the pressure of phosphate reserve depletion, but the economically recoverable reserve would still be depleted around 2053. © 2022, The Authors. All rights reserved.

关键词： Water pollution

来源：评论

学校读者我要写书评

暂无评论

Effects of a Redox-Active Diketone On the Photochemical Transformation of Roxarsone: Mechanisms and environmental Implications

SSRN

引用

SSRN 2022年

作者： Wei, Shuangshuang Zhou, Chang Zhang, Guoyang Zheng, Hongcen Chen, Zhihao Zhang, Shujuan State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Organoarsenics pose a severe threat to the environment and human health. In aquatic environment, dissolved organic matter (DOM)-mediated photochemical transformation is one of the main processes in the fate of variant pollutants, including organoarsenics. Dicarbonyl is a typical redox-active moiety in DOM. However, the knowledge on the photoconversion of organoarsenics by DOM, especially the contributions of dicarbonyl moieties is still limited. Here, we systematically investigated the photochemical transformation of three organoarsenics with the simplest β-diketone, acetylacetone (AcAc), as a model dicarbonyl moiety of DOM. The results demonstrate that AcAc was a potent photo-activator and oxygen-depleting agent, which could significantly enhance the photochemical transformation of roxarsone (ROX). At a 1:1 molar ratio of AcAc to ROX, the photochemical transformation rate of ROX was increased by 7 folds. In O2-rich environment, singlet oxygen, peroxide radicals, and ·OH were the main reactive species that led to the breakage of the C-As bond in ROX and the oxidation of the released arsono group to arsenate, whereas the triplet-excited state of AcAc (3AcAc*) and carbon-centered radicals from the photolysis of AcAc dominated in the reductive transformation of ROX. In anoxic environment, 3-amino-4-hydroxyphenylarsonic acid was one of the main reductive transformation intermediates of ROX, whose photolysis rate was about 35 times that of ROX. The knowledge obtained here is of great significance to better understand the fate of organoarsenics in natural environment. © 2022, The Authors. All rights reserved.

关键词： Dissolved oxygen

来源：评论

学校读者我要写书评

暂无评论

Development and assessment of an onsite large volume solid phase extraction (LV-SPE) device for the determination of pharmaceuticals and personal care products (PPCPs) in water

引用

Emerging Contaminants 2024年第1期10卷 24-31页

作者： Xue Cheng Ning Fang Yuxi Ge Wenchao Li Yamei Hui Zilong Tang Yu Wan Yuancheng Li State Key Joint Laboratory of Environmental Simulation and Pollution Control(SKLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)Beijing Laboratory for Environmental Frontier Technologies(BLEFT)School of EnvironmentTsinghua UniversityBeijing100084China CSD IDEA(Beijing)Environmental Test and Analysis Co. Ltd.Beijing100192China School of Public Health Shandong First Medical University&Shandong Academy of Medical ScienceShandong Province250117China

It is essential to determine the occurrence of emerging organic contaminants(EOCs),such as pharmaceuticals and personal care products(PPCPs),in the ambient environment to address growing public ***,such analysis is quite challenging due to the low trace level of such contaminants in water,which therefore requires several litres of water *** this study,a large volume solid phase extraction(LV-SPE)device was developed and evaluated for its performance in monitoring PPCPs as an *** good recoveries and reproducibility were obtained under specific operating conditions:a water sample volume of no more than 20 L,a flow rate not exceeding 120 mL/min,and a methanol elution volume of at least 30 *** addition,the results from the onsite enrichment approach using LV-SPE were compared with those from the conventional approach using a standard SPE device in the laboratory for real groundwater *** the eight selected PPCPs(nalidixic acid,carbamazepine,bezafibrate,clofibric acid,sulfadiazine,sulfamethoxypyridazine,sulfamethazine and sulfamonomethoxine),LV-SPE approach detected more target *** the detected concentrations were generally comparable,slightly higher concentrations were observed for carbamazepine,clofibric acid,sulfadiazine and sulfamethazine using the LV-SPE *** developed LV-SPE device provides an alternative approach for trace analysis of PPCPs and may also be applicable for other emerging organic contaminants.

关键词： Large-volume Solid phase extraction Onsite enrichment PPCPs Emerging organic pollutants

来源：评论

学校读者我要写书评

暂无评论

One-step simultaneous biomass synthesis of iron nanoparticles using tea extracts for the removal of metal(loid)s in acid mine drainage

引用

Chemosphere 2023年第1期337卷 139366页

作者： Pan, Zibin Xie, Rongrong Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China

Acid Mine Drainage (AMD) contains various metal/metalloid ions such as Fe, Cu, and As, which all impact seriously on mine ecosystems. Currently, the commonly used chemical methods for treating AMD may cause secondary pollution to appear in the environment. In this study, one-step simultaneous biomass synthesis of iron nanoparticles (Fe NPs) using tea extracts for the removal of heavy metals/metalloids in AMD is proposed. Characterizations revealed that the Fe NPs presented severely agglomerated particles with an average particle size of 119.80 ± 4.94 nm, on which various AMD-derived metal(loid)s, including As, Cu, and Ni, were uniformly dispersed. The biomolecules participating in the reaction in the tea extract were identified as polyphenols, organic acids, and sugars, which acted as complexing agents, reducing agents, covering/stabilizing agents, and promoted electron transfer. Meanwhile, the best reaction conditions (reaction time = 3.0 h, volume ratio of AMD and tea extract = 1.0:1.5, concentration of extract = 60 g/L, and T = 303 K) were obtained. Finally, the simultaneous formation of Fe NPs and their removal of heavy metals/metalloids from AMD was proposed, mainly involving the formation of Fe NPs and adsorption, co-precipitation, and reduction processes of heavy metals/metalloids. © 2023 Elsevier Ltd

关键词： Heavy metals

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：