English|网站地图|旧版主站
您现在的位置:广西大学>> 新闻中心>> 学术活动
学术活动

庆祝广西大学成立90周年系列学术报告会:Investigation of Cataphotolysis of Organic Contaminants in Water(资环材学院)

来源: 作者: 发布时间:2018-07-03 浏览次数: 【字体:

   :Investigation of Cataphotolysis of Organic Contaminants in Water

:Zhuangjie Li博士,美国加州大学富尔顿分校 终身副教授

    :2018年7月9日 下午15:00-17:00

    :资源环境与材料学院301室

 

                                         资源环境与材料学院

                                            2018.7.3

Abstract

Irrigation of farmland consumed approximately 80% of total water usage in California. Contamination of California ground and surface water by pesticides, including herbicides and fungicides, due to agricultural application is an important environmental issue that affects California welfare.  Crops including vegetables and fruit could be contaminated if the water containing pesticides is reused for irrigation. It therefore is important to remove pesticides from the irrigated water prior to its reuse.  Traditional ways of cleaning water contaminated with organics are either costly or lead to formation of by-products. We are developing methods to remove organics from water using sunlight cataphotolysis approaches. Current investigation focus on coating nanomaterials on a glass plate for cataphotolysis of Propanil, Diuron, and Metolachor. It was found that these pesticides undergo cataphotolytic degradation, and the photolytic process follows the first order chemical kinetics with a rate constant in the range of (0.8~2.5) x 10-3 min-1. Both ultraviolet and visible components of sunlight were found to contribute to the cataphotolysis. Study of the cataphotolysis products suggested that these organic contaminants were finally oxidized into CO2 and NO2, which dissolved in water giving rise to lower pH values than the neutral water. The experimental detail and the implication of the present work to future cleaning of the organic contaminants from water are discussed.

 

专家简介

Zhuangjie Li博士,1991年获美国韦恩州立大学物理化学博士学位,现任美国加州州立大学富尔顿分校(California State University Fullerton) 化学和生物化学系终身副教授,美国化学学会会员。长期从事大气化学、水中挥发性有机污染物检测分析和大气污染物去除反应机制与动力学等方面的研究和教学工作,主持完成了包括美国国家自然科学基金项目、美国环境保护署科学研究基金项目在内的多项研究课题,是JPCA, CPL, JACS, JGR, IJCK, ES&T, PNAS等多个刊物的审稿人,也是美国国家科学基金(NSF)、美国国家研究开发和ACS-Petroleum等多个研究基金的评审人。