Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

被引：27

作者：

Schneider, Olivia M. ^{[1
]}

Liang, Robert ^{[1
,2
]}

Bragg, Leslie ^{[3
]}

Jaciw-Zurakowsky, Ivana ^{[1
]}

Fattahi, Azar ^{[1
]}

Rathod, Shasvat ^{[1
]}

Peng, Peng ^{[4
]}

Servos, Mark R. ^{[3
]}

Zhou, Y. Norman ^{[1
,2
]}

机构：

[1] Univ Waterloo, Ctr Adv Mat Joining, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada

[2] Univ Waterloo, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada

[3] Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada

[4] Beihang Univ, Sch Mech Engn & Automat, Int Res Inst Multidisciplinary Sci, 37 Xueyuan Rd, Beijing 100191, Peoples R China

来源：

CATALYSTS | 2019年 / 9卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Microcystis aeruginosa; microcystin; controlled periodic illumination; titanium dioxide; advanced oxidation process; ADVANCED OXIDATION PROCESSES; IMMOBILIZED TIO2; DECOMPOSITION; REACTOR; MECHANISMS; CONTAMINANTS; DESTRUCTION; EFFICIENCY; KINETICS; REMOVAL;

D O I：

10.3390/catal9020181

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Toxic microcystins (MCs) produced by freshwater cyanobacteria such as Microcystis aeruginosa are of concern because of their negative health and economic impacts globally. An advanced oxidation process using UV/TiO2 offers a promising treatment option for hazardous organic pollutants such as microcystins. The following work details the successful degradation of MC-LA, MC-LR, and MC-RR using a porous titanium-titanium dioxide (PTT) membrane under UV-LED light. Microcystin quantitation was achieved by sample concentration and subsequent LC-MS/MS analysis. The PTT membrane offers a treatment option that eliminates the need for the additional filtration or separation steps required for traditional catalysts. Controlled periodic illumination was successfully used to decrease the total light exposure time and improve the photonic efficiency for a more cost-effective treatment system. Individual degradation rates were influenced by electrostatic forces between the catalyst and differently charged microcystins, which can potentially be adjusted by modifying the solution pH and the catalyst's isoelectric point.

引用

页数：10

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