Photodegradation of surfactants on the nanosized TiO2 prepared by hydrolysis of the alkoxide titanium

Nanosized TiO(2) was synthesized by hydrolysis of titanium tetraisopropoxide in the nanodroplets of microemulsions. The microemulsion provided by functionalized surfactants derived from the mixture of the commercially available sodium dodecylbenzensulfonate (DBS) and sodium dodecyl sulfate (DS). The resulting TiO(2) nanoparticles were characterized by transmission electron microscopy, X-ray diffraction, and differential thermal analysis. Nanosized TiO(2) of anatase was found to show good photocatalytic properties in the photodegradation of DBS and DS surfactants. The cleavage of the aromatic moiety, the intermediate products and ultimate mineralization to CO(2) were examined in the process of photodegradation. A mechanism is also proposed on the basis of these experimental results.     

A global comprehensive analysis of ambient low temperature and non-communicable diseases burden during 1990–2019

Environmental Science and Pollution Research - Climate change and health are inextricably linked, especially the role of ambient temperature. This study aimed to analyze the non-communicable...     

均匀沉淀法制备纳米TiO2及其在环保方面的应用

本文以偏钛酸为原料,采用均匀沉淀法制备纳米ＴｉＯ２,所制得的纳米微晶平均粒径约为８．５ｎｍ,并能在７００℃保持锐钛矿型晶体结构,当它应用于染料溶液的光催化分解,与ＭＴ－１５０Ｗ光催化相比,具有较好的催化活性。同时,我们用Ａｌ２Ｏ３陶瓷膜回怍纳米ＴｉＯ２循环再利用,这为纳米ＴｉＯ２在环保方面的大规模应用创造了条件。     

新型菌株法检测典型环境雌激素类物质

相对于化学检测方法,生物法检测环境雌激素类污染物具有简便快捷等优点。利用本实验室已建立的环境雌激素类污染物的基因工程菌检测技术,对17-β-雌二醇(17-β-(o)estradiol)的雌激素活性进行了检测,绘制了标准曲线,确定其检测限为ng/L。并且利用该菌株法分别对艹屈(chrysene)、芘(pyrene)和苯并(a)蒽(benz(a)anthracene)3种不同结构的多环芳烃的雌激素活性进行了检测。结果显示,3种物质的雌激素活性差异明显,具有不同的检测限。此外,对污水和污泥样品中的麝香含量进行了检测,结果显示其活性变化趋势与化学法检测结果基本一致。因此,利用该基因工程菌检测技术可对环境样品中一定的雌激素活性进行快速有效地筛选;进一步对比17-β-雌二醇的标准曲线,可实现对雌激素类物质的初步定量。     

氧氟沙星和诺氟沙星的水环境光化学转化:pH值及溶解性物质的影响

在模拟日光照射下,考察了氧氟沙星和诺氟沙星在纯水和天然水中的光降解行为,结果表明,氧氟沙星和诺氟沙星的光降解随p H增加(p H=4—10)先增快后减慢,两种抗生素以两性离子形态存在时光解最快.氧氟沙星和诺氟沙星在天然水中的光降解显著慢于其在相似p H条件下(p H=8)纯水中的光降解,天然水中的溶解性物质对两种抗生素的光降解总体表现为抑制作用.以Suwannee河富里酸为例,研究了溶解性有机质(DOM)的影响机制,发现淡水中高浓度的DOM主要通过竞争光吸收抑制氧氟沙星和诺氟沙星的光解,而海水中低浓度的DOM可以通过淬灭活性物种抑制两种抗生素的光解.天然水中的金属阳离子(Ca2+和Fe3+)和NO-3分别通过配位作用和光致生成·OH影响氧氟沙星和诺氟沙星的降解.由此可见,氧氟沙星和诺氟沙星在天然水中的光化学行为依赖于水体p H值和溶解性物质的综合影响.     

危险化学品安全监管的实践与探讨

危险化学品的安全监管具有其特殊的复杂性，生产、经营、储存、运输、使用以及废弃处置等各个环节，都存在着安全隐患。对危险化学品的安全管理，既需要纵向的层层监管，又需要横向的跨部门、跨领域、跨学科的广泛协作，既需要政府的重视与管理，也需要企业与大众的关注。健全法律法规体系、强化安全管理、     

Short-term effects and economic burden assessment of ambient air pollution on hospitalizations for schizophrenia

Environmental Science and Pollution Research - The evidence on the health and economic impacts of air pollution with schizophrenia is scarce, especially in developing countries. In this...     

Temporal trends of the association between temperature variation and hospitalizations for schizophrenia in Hefei,China from 2005 to 2019: a time-varying distribution lag nonlinear model

Environmental Science and Pollution Research - Along with climate change, unstable weather patterns are becoming more frequent. However, the temporal trend associated with the effect of temperature...