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Comparative study of photocatalytic and non-photocatalytic reduction of nitrates in water ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
42490 45928 2009 8 PDF Available
Title
Comparative study of photocatalytic and non-photocatalytic reduction of nitrates in water ☆
Abstract

A Pd–Cu/TiO2 catalyst was comparatively studied in the catalytic and phototocatalytic reduction of nitrates in water. The reaction was systematically investigated in the presence of H2, HCOOH (which can act as reductant in catalytic experiments and/or hole scavenger in photocatalytic experiments) or mixtures of both, and in the presence or absence of UV irradiation. The catalytic reduction of nitrates was efficiently performed with H2 or H2 + HCOOH as the reductant, but was poorly efficient in the presence of HCOOH alone. In the photocatalytic experiments, UV irradiation significantly improved the reaction provided that both H2 + HCOOH were present. Ammonium formation occurred at high conversion of nitrates, whatever the reaction conditions applied. The combination of UV with formic acid showed the slowest activity but prevented ammonium formation.

Graphical abstractA Pd–Cu/TiO2 catalyst was comparatively studied in the catalytic and phototocatalytic reduction of nitrates in water, in the presence of H2, HCOOH or mixtures of both, and in the dark or under UV irradiation. The catalytic reduction under H2 in the dark led to the highest reaction rate. UV irradiation significantly improved the reaction provided that both H2 + HCOOH were present.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Nitrates reduction; Catalytic reduction; Photocatalytic reduction; Pd–Cu; TiO2; Drinking water
First Page Preview
Comparative study of photocatalytic and non-photocatalytic reduction of nitrates in water ☆
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 368, Issues 1–2, 31 October 2009, Pages 1–8
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis