您好，欢迎访问广东省农业科学院 机构知识库！
广东省农业科学院机构知识库

全部

  • 全部
  • 标题
  • 学者
  • 机构
  • 关键词

Comparison of Aqueous Photoreactions with TiO2 in its Hydrosol Solution and Powdery Suspension for Light Utilization

文献类型： 外文期刊

作者： Liu, Tong-xu 1 ; Liu, Yuan 1 ; Zhang, Zhao-ji 1 ; Li, Fang-bai 2 ; Li, Xiang-zhong 1 ;

作者机构： 1.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China

2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

期刊名称：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH （ 影响因子：3.72； 五年影响因子：3.99 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： In aqueous photoreaction systems, the existence of gradient light intensity throughout the reaction solution is one of the important restrictions to the efficiency of the overall photoreaction, which highly relies on the optical properties of the catalyst such as light absorption and scattering effects, the particle size of the catalyst, and the degree of agglomeration in its slurry. In this study, both synthesized TiO2 hydrosol and commercial TiO2 powder, Degussa TiO2 P25, were used as catalysts for comparison, in which their particulate and optical properties in aqueous solution/suspension were investigated. The characteristic results showed that the TiO2 hydrosol had smaller crystal sizes and particle sizes, but a lower degree of crystallinity compared to the P25 powder. As TiO2 hydrosol solution had the much lower light extinction coefficient than P25 suspension, the attenuation, of light intensity gradient in the reaction solution containing more transparent TiO2 hydrosol was greatly eliminated. However, both types of catalysts demonstrated similar effects of significant light scattering in their solution/suspension. The photocatalytic activities of two catalysts were then evaluated in two sets of experiments for methyl orange (MO) and methylsulfonic acid (MSA) degradations, respectively. The much higher reaction rates of MO and MSA degradations were found in the TiO2 hydrosol solution than in the P25 suspension, because TiO2 hydrosol catalyst with much finer particles and higher transparency allowed the photoreactor system to work at a higher catalyst loading than the conventional TiO2 powdery catalyst. Anew kinetic model considering three main factors of (i) the volumetric rate of photon absorption, (ii) effective reaction volume, and (iii) the effective surface area of catalyst in a cylindrical photoreactor was also established. This new model summarizes that the catalyst with a higher surface area, a lower light extinction coefficient, and a lesser light scattering effect would achieve better light utilization within the photoreactor system and is beneficial to achieve a higher efficiency of overall photoreaction.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：广东省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台