Stability properties of natural estrogen conjugates in different aqueous samples at room temperature and tips for sample storage

Environmental Science and Pollution Research - It is important to keep natural estrogen conjugates (C-NEs) intact in aqueous environmental sample before sample preparation; otherwise, this may...     

Graphene-based photocatalytic nanocomposites used to treat pharmaceutical and personal care product wastewater: A review

Photocatalytic technology has been widely studied by researchers in the field of environmental purification. This technology can not only completely convert organic pollutants into small molecules of CO₂ and H₂O through redox reactions but also remove metal ions and other inorganic substances from water. This article reviews the research progress of graphene-based photocatalytic nanocomposites in the treatment of wastewater. First, we elucidate the basic principles of photocatalysis, the types of graphene-based nanocomposites, and the role of graphene in photocatalysis (e.g., graphene can accelerate the separation of photon-hole pairs and increase the intensity and range of light absorption). Second, the preparation, characterization, and application of composites in wastewater are introduced. We also discuss the kinetic model of the photocatalytic degradation of pollutants. Finally, the enhancement mechanism of graphene in terms of photocatalysis is not completely clear, and graphene-based photocatalysts with high catalytic efficiency, low cost, and large-scale production have not yet appeared, so there is an urgent need for more extensive and in-depth research.

     

Synergistic adsorption and advanced oxidation activated by persulfate for degradation of tetracycline hydrochloride using iron-modified spent bleaching earth carbon

At present, tetracycline hydrochloride (TCH) is a widely used antibiotic, and is often detected in water, posing a serious harm to human and ecological health. In this study, spent bleaching earth (SBE) was pyrolyzed to obtain spent bleaching earth carbon (SBE@C) and the nano Fe⁰/SBE@C prepared after zero-valent iron loading was adopted to remove TCH in water for the first time. The combination of nano Fe⁰/SBE@C and PS, the strong adsorption of SBE@C coupled with the oxidation of free radicals could achieve TCH efficient removal. The effects of nano Fe⁰ load, nano Fe⁰/SBE@C dosage, solution initial pH, and PS/TCH molar ratio on TCH removal efficiency in nano Fe⁰/SBE@C?+?PS system were studied. The results indicate that the optimal reaction conditions are 5% nano Fe⁰ load, 0.2 g/L nano Fe⁰/SBE@C dosage, initial pH of 3, PS/TCH molar ratio of 100:1. Under these conditions, TCH removal efficiency could reach 91%. Meanwhile, response surface methodology (RSM) was applied to predict optimal value of reaction conditions. The removal efficiency corresponding to the predicted optimal conditions was consistent with the actual removal efficiency obtained from the experiment. Moreover, six reaction systems were tested, and TCH removal efficiency in the SBE@C?+?PS system was 22.6%. When nano Fe⁰ was loaded on SBE@C, TCH removal efficiency in Fe⁰/SBE@C?+?PS system increased to 78.2%, in which TCH was first adsorbed on the surface of nano Fe⁰/SBE@C, and then was degraded by the oxidation of SO₄^?? and ?OH. Totally, the nano Fe⁰/SBE@C?+?PS system displayed excellent TCH removal efficiency, good stability and reusability, exhibiting a promise toward TCH removal.

     

Exploring new ideas for sustainable development of urban agglomerations-based on the coupling of people’s livelihood and environmental governance

Environment, Development and Sustainability - Peoples’ livelihood and environmental governance are interrelated and interact with each other, which is a new starting point for the study of...     

长江中下游大洪水与中强地震的相关性分析

1998年 ,长江流域发生了类似 195 4年的百年一遇全江性大洪水 ,1999年长江又发生了较大洪水。在上述背景下 ,长江中下游地区是否会发生中强震 ,需要进行认真的探讨。初步研究结果表明 ,长江大洪水之后 3年内 ,鄂、湘沿江地区中强地震受长江大洪水的“耦合振荡”作用较大。     

基于ＷＲＦ与田湾核电站外围监控系统的区域风场模 拟对比分析

WR F模式是新一代中尺度预报模式和同化系统，通过 WR F 模式构建田湾核电站区域气象预报系统，可为江苏省建设先进的核应急决策支持系统提供坚实的理论基础和技术支持。介绍了田湾核电站区域 WR F 模式风场预报系统的构建和对比试验情况，通过数值模拟风场与实测结果的对比检验，WR F模式精细化的三维风场预测具有非常高的准确性。     

油田采出水膜法处理技术应用研究进展

对采出水膜法处理技术中的微滤、超滤、纳滤、反渗透膜以及集成技术的应用进行研究,分析成本,总结各技术的特点。超滤、微滤主要处理的是水中的油类以及悬浮物和细菌,纳滤对二价离子的脱除率较高,反渗透技术可以有效降低采出水矿化度。在实际采出水处理中,可综合运用膜技术和生物法达到更好的处理效果。