Spatial spillover effects of urbanization on carbon emissions in the Yangtze River Delta urban agglomeration,China

Environmental Science and Pollution Research - To achieve a win–win situation for both urbanization and carbon emissions reduction from a spatiotemporal perspective, we need to identify the...     

The trade-off between economic performance and environmental quality: does financial inclusion matter for emerging Asian economies?

Environmental Science and Pollution Research - This study examines the role of financial inclusion on the environment-economic performance in the top five Asian emerging economies. The data used...     

Co-present Pb(II) accelerates the oxidation of organic contaminants by permanganate: Role of Pb(III)

• Simultaneous removal of organic contaminants and Pb(II) was achieved by Mn(VII). • Pb(II) enhanced Mn(VII) oxidation performance over a wide pH range. • Pb(II) did not alter the pH-rate profile for contaminants oxidation by Mn(VII). • Mn(VII) alone cannot oxidize Pb(II) effectively at pH below 5.0. • Pb(III) plays important roles on enhancing Mn(VII) decontamination process. The permanganate (Mn(VII)) oxidation has emerged as a promising technology for the remediation and treatment of the groundwater and surface water contaminated with the organic compounds. Nonetheless, only a few studies have been conducted to explore the role of the heavy metals (especially the redox-active ones) during the Mn(VII) oxidation process. In this study, taking Pb(II) as an example, its influence on the Mn(VII) decontamination performance has been extensively investigated. It was found that, with the presence of Pb(II), Mn(VII) could degrade diclofenac (DCF), 2,4-dichlorophenol, and aniline more effectively than without. For instance, over a wide pH range of 4.5–8.0, the dosing of 10 μmol/L Pb(II) accelerated the DCF removal rate from 0.006–0.25 min⁻¹ to 0.05–0.46 min⁻¹ with a promotion factor of 1.9–9.4. Although the UV-vis spectroscopic and high resolution transmission electron microscopy analyses suggested that Mn(VII) could react with Pb(II) to produce Mn(IV) and Pb(IV) at pH 6.0–8.0, further experiments revealed that Pb(II) did not exert its enhancing effect through promoting the generation of MnO₂, as the reactivity of MnO₂ was poor under the employed pH range. At pH below 5.0, it was interesting to find that, a negligible amount of MnO₂ was formed in the Mn(VII)/Pb(II) system in the absence of contaminants, while once MnO₂ was generated in the presence of contaminants, it could catalyze the Pb(II) oxidation to Pb(IV) by Mn(VII). Collectively, by highlighting the conversion process of Pb(II) to Pb(IV) by either Mn(VII) or MnO₂, the reactive Pb(III) intermediates were proposed to account for the Pb(II) enhancement effect.     

Visible-light-responsive photocatalytic inactivation of ofloxacin-resistant bacteria by rGO modified g-C3N4

Environmental Science and Pollution Research - The visible light responsive graphitic nitride (g-C3N4) mediated photocatalysis has drawn extensive attention in water treatment field....     

加强全过程管理提升环境监测质量

环境监测是环境保护的基本工作,是环境管理的耳目和手段。做好环境监测的管理,提高环境监测的质量极为重要。文章从环境监测管理工作实际出发,介绍了环境监测过程管理,分析了样品采集、样品管理、实验室分析等影响环境监测质量的主要因素,结合环境监测日常运行管理,对环境监测进行全过程分析,提出了监测人员综合素养、设备设施、全过程质量控制等质量管理措施,以持续提升环境监测水平,促进生态文明和经济社会的共同发展。     

乡村韧性研究进展与展望

在快速城镇化背景下,各种不确定性扰动并制约着乡村可持续发展。乡村韧性作为乡村风险治理的一种新思路,已逐渐成为国内外学者广泛关注的新课题。在概述乡村韧性的缘起与概念演变的基础上,从乡村韧性的应用领域、社会—生态层面对乡村韧性的影响、乡村韧性评价等方面对当前乡村韧性的研究现状进行探讨,指出当前乡村韧性研究仍存在诸多薄弱环节,如:尚未形成公认的乡村韧性理论框架,应用性的乡村韧性实证研究相对薄弱,科学系统的乡村韧性评价体系构建有待完善。     

面向可持续发展目标的中国生态环境领域指标评估研究

联合国《2021年可持续发展报告》旨在支持各国识别实现17项可持续发展目标（SDGs）的优先行动事项,明确重要的执行挑战,对目标实施进展进行评估,并进行国家间的比较分析,保证各国以可持续的方式使用自然资源和环境成本,使人类的发展控制在地球承载能力之内,从而推动实现2030年可持续发展目标。2021年评估结果显示中国是全球落实SDGs进展较好的国家之一,生态环境领域仍是制约中国实现可持续发展2030战略目标的短板,中国亟须加快推进补齐补强指标短板,积极参与全球环境治理,加强环保领域多边双边合作,为世界环境治理和可持续发展提供“中国智慧”和“中国方案”。本文通过分析《2021年可持续发展报告》评估结果,探讨评估方法学及指标体系变化情况,分析中国生态环境领域SDGs评估结果,发现在国际评估框架下中国生态环境领域的短板问题,并提出推进SDGs指标体系本土化、补齐SDGs短板等针对性的对策建议。     

外源Fe调控根系微生物群落结构和功能对水稻Cd积累的影响

探究外源铁（Fe）在水稻镉（Cd）阻控效应方面的研究对保障粮食安全具有重要意义.通过水培实验,研究了3种Fe浓度（5、50和500 μmol·L^-1 EDTA-Na₂Fe）对水稻Cd的积累效应和根系微生物群落结构的影响.结果表明,环境Fe浓度的增加促使水稻根表铁膜的形成,缺Fe和Fe充裕情况下均会促进根表铁膜对Cd的吸附固定.和正常Fe相比,缺Fe促进根Cd和地上部Cd累积,分别增加了49.76%和15.68%;而Fe充裕促进了根Cd的积累,增加了18.39%,但显著降低地上部Cd的含量,降低幅度为35.95%.采用16S rRNA高通量测序测定根系微生物群落结构并通过PCA、LEfSe和RDA等分析方法发现,和正常Fe相比,缺Fe环境会降低根系微生物的丰富度和均匀度,在门水平下Proteobacteria和Bacteroidetes为优势菌群,缺Fe抑制Bacteroidetes相对丰度的增加,Fe充裕使Proteobacteria相对丰度降低.而在属水平功能微生物Ensifer、Rhodopila、Bdellovibrio和Dyella等的相对丰度在不同处理下发生改变,可能通过影响根表铁膜的形成和其他生化过程继而影响水稻对Cd的吸收和积累.并且缺Fe环境对微生物功能影响高于Fe充裕环境.为探寻不同Fe环境下调控水稻根系微生物的群落结构变化,以降低水稻对Cd的吸收转运能力,进而为Fe对Cd的阻控机制提供理论依据,并为我国南方稻田Cd污染治理提供重要参考.     

An effective approach to improve ethanol productivity by simultaneous saccharification and fermentation of rice straw

Fuel ethanol was produced using rice straw with the simultaneous saccharification and fermentation (SSF) method. The influence of cellulose liquefaction pretreatment and Fe²⁺ quantity on ethanol productivity was investigated in detail. At the same time, the optimized conditions including fermentation temperature, Fe²⁺ amount, yeast inoculation quantity, and the inoculated cellulose enzyme dosage in the SSF process were systematically investigated by analyzing fuel ethanol yield. The result indicated that fuel ethanol yield was 0.319 g per gram rice straw by SSF approach when appropriate amount of Fe²⁺ was added into the reaction system. The optimal technology parameters were: fermenting temperature of 36°C, Fe²⁺ amount of 4 mg · g^?1, inoculating proportion of 20%, cellulose enzyme of 20 IU · g^?1, and Pachysolen tannophilu/saecharomyces cerevisiae of 1:2 ratio. The ethanol yield under the best conditions was larger than that of the control group. We hope that this research can facilitate to achieve large-scale comprehensive utilization for rice straw.     

阴离子交换树脂对水杨酸的吸附与解吸性能

研究了714阴离子交换树脂对水中水杨酸的吸附与解吸性能,探讨了吸附的热力学和动力学特性.结果表明,树脂在pH=4～12时,吸附能力最好.等温吸附遵循Freundlich和Langmuir吸附平衡模型,为优惠吸附过程.在298～318K条件下,水杨酸吸附量为100～120mg/g的吸附焓变为-23.4-21.6kJ/mo...