A modified flower pollen-based photothermocatalytic process for enhanced solar water disinfection : Photoelectric effect and bactericidal mechanisms

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Dehua Xia
  • Qi Chen
  • Yimu Jiao
  • Qiyu Lian
  • Chun He
  • Tianqi Wang

Detail(s)

Original languageEnglish
Article number118423
Journal / PublicationWater Research
Volume217
Online published6 Apr 2022
Publication statusPublished - 15 Jun 2022

Abstract

Solar disinfection (SODIS) is regarded as an affordable and effective point-of-use (POU) water disinfection treatment urgently needed in rural developing world. This work developed an enhanced SODIS scheme that utilized a novel flower pollen-based catalyst (Te-TRP). The bench-scale experiments demonstrated 100% photothermocatalytic inactivation of approximately 7-log E. coli K-12, Spingopyxis sp. BM1-1, or S. aureus bacterium by Te-TRP within 40–60 min. Moving toward practical device design, we constructed a flow-through reactor and demonstrated the outstanding water disinfection performance of Te-TRP. The in-depth mechanistic study revealed the synergetic effect between photocatalysis and photothermal conversion and identified the bacterial inactivation pathway. 1O2 and ·O2¯ were verified to be the dominant reactive oxygen species involved in the bacterial inactivation. The damage to bacterial cells caused by photothermocatalytic reactions was systematically investigated, demonstrating the cell membrane destruction, the loss of enzyme activity, the increased cell membrane permeability, and the complete inactivation of bacteria without the viable but nonculturable state cells. This work not only affords a facile approach to preparing biomaterial-based catalysts capable of efficient photothermocatalytic bacterial inactivation, but also proposes a prototype of POU water treatment, opening up an avenue for sustainable environmental remediation.

Research Area(s)

  • Bactericidal mechanism, Nature-inspired material, Photocatalytic, Photothermal, Solar disinfection

Citation Format(s)

A modified flower pollen-based photothermocatalytic process for enhanced solar water disinfection: Photoelectric effect and bactericidal mechanisms. / Xia, Dehua; Chen, Qi; Jiao, Yimu et al.
In: Water Research, Vol. 217, 118423, 15.06.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review