Removal of groundwater nitrates by heterogeneous supramolecular complexes-like photocatalytic system based on in-situ generated and highly active Ti3+/Ti2+ states in the reduced TiO2

被引：15

作者：

Dharmagunawardhane, Dulanji S. ^{[1
]}

De Silva, Nuwan L. ^{[1
]}

Gunatilake, Udara Bimendra ^{[1
]}

Yan, Chang-Feng ^{[2
]}

Bandara, Jayasundera ^{[1
]}

机构：

[1] Natl Inst Fundamental Studies, Hantana Rd, Kandy 20000, Sri Lanka

[2] Chinese Acad Sci, Guangzhou Inst Energy Convers, Hydrogen Prod & Utilizat Lab, Guangzhou 510640, Guangdong, Peoples R China

来源：

MOLECULAR CATALYSIS | 2019年 / 470卷

基金：

中国国家自然科学基金;

关键词：

Nitrate removal; Water treatments; Photocatalysis; Photoreduction; Reduced TiO; Ti3+; CATALYTIC-REDUCTION; OXYGEN VACANCIES; WATER-TREATMENT; WASTE-WATER; DEGRADATION; NANOPARTICLES; IDENTIFICATION; SEPARATION; COMPOSITE; MECHANISM;

D O I：

10.1016/j.mcat.2019.03.028

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：

In this investigation, a novel catalytic nitrate reduction method by using the In-situ generated Ti3+ /Ti2+ states in the TiO2/Al catalyst was demonstrated. The Ti3+/Ti2+ states in TiO2/Al catalyst harvest the UV to near IR regions of the solar spectrum and continuously self-generated via the absorption of visible-near infrared radiations. The formation of reduced titanium oxidation states and the visible light harvesting properties of the catalyst were determined by X-ray Photoelectron Spectroscopy (XPS) analysis and diffuse reflectance transmission respectively. With the TiO2/Al catalyst, over 95% of nitrate removal could be achieved for an initial nitrate concentration of 100 ppm. Based on XPS, FTIR analysis and the reaction products, a possible nitrate reduction mechanism is proposed in which in-situ generated Ti3+/Ti2+ states can harvest visible-near infrared photons as well as found to be the active sites for the reduction of nitrates and hence function similar to supramolecular complex photocatalytic system. The catalytic system described can be easily adapted adapted for the groundwater nitrate removal.

引用

页码：89 / 96

页数：8

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