Highly Efficient Solar Water Disinfection: Design, Preparation and Applications

Zhenyuan Teng, Hongying Lv, Chengyin Wang, Ming Zhang
2017 The Proceedings of the 5th International Conference on Industrial Application Engineering 2017   unpublished
Renewable solar energy can be used all over the world for water purification. Employing indirect radical oxygen species generated form photocatalytic reactions emerged to be a promising approach. However, dissolved oxygen, which is only slightly soluble in water, restricted the generation speed via oxygen reduction reaction. Here in, a highly-efficient metal-free nano-coating for solar water disinfection was prepared by assembling edge-oxygenous-functionalized graphitic carbon nitride
more » ... n nitride nanosheets, which showed a bacteria inactivation of > 99.9999 % in only 30 min and twenty-fold first-order disinfection rate compared with the most efficient previously reported carbon nitride based photocatalyst. The efficiently exposed carboxyl (-COOH) and carbonyl (-C=O) at the edge of the carbon nitride nanosheets were firstly proved to accelerate hydrogen peroxide (H2O2) via water oxidation reaction pathway with tremendous activity. Moreover, a fixed bed reactor modified by the nano-coating firstly achieved bacteria inactivation in the flowing water. The presented water oxidation reaction cannot only be employed by carbon-nitride based photocatalysts, but also other photocatalysts in which peroxides usually poison oxygen evolution reactions.
doi:10.12792/iciae2017.002 fatcat:zzvbxatkrnfqhfaj3hwwnwtkl4