fulltext.study @t Gmail

Evaluation of a novel Carberry type photoreactor for the degradation of organic pollutants in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
28393 44074 2007 8 PDF Available
Title
Evaluation of a novel Carberry type photoreactor for the degradation of organic pollutants in water
Abstract

The major drawback of slurry-type photoreactors is the final particle–fluid separation for the catalyst recycling. If a catalyst (e.g. TiO2 for oxidative mineralisation of pollutants) is immobilized on a rigid support as a thin film, such problem is avoided. Unfortunately, as the reaction occurs at the liquid–solid interface, the overall rate is much lower in thin-film reactors than in the corresponding slurry systems. Our goal was to design a laboratory-scale batch photoreactor, which would combine the advantages of slurry and immobilized photocatalytic systems: (i) high ratio of illuminated immobilized catalyst surface to the volume of reaction liquid inside the reactor; (ii) high degree of mixing; (iii) possibility of installing the reactor into the compound parabolic collectors that utilize solar energy. The glass tube with the spinning basket inside (up to 12 glass slides of immobilized catalyst are positioned radially around the central axis) meets these criteria. Degussa P25 TiO2 or sol–gel produced TiO2 was immobilized on sodium glass support and the disappearance of 4-chlorophenol in water was monitored by HPLC analysis. Low-pressure mercury fluorescent lamps with broad maximum at 355 nm were used as a UVA radiation source. The optimal catalyst concentration in the photocatalytic experiments was 800 mg L−1 (regardless of the slurry or immobilized system). It was also estimated that the configuration of a novel Carberry type photoreactor with 12 fastened TiO2 slides shows nearly 4 times (3.8 times) higher photocatalytic activity compared to the configuration with two TiO2 slides (with the comparable surface density of immobilized TiO2), serving as an approximation of a classic plain thin-film fixed-bed reactor. On the other hand, the activity of our novel thin-film based reactor is still almost twice (1.8 times) lower than the activity of a slurry reactor (Degussa P-25 catalyst in both cases), which is still a very promising result.

Keywords
CTP, Carberry type photoreactor; PTFFBR, plain thin-film fixed-bed reactor; CPC, compound parabolic collector; A, surface of glass slides coated with TiO2 layer; t1/2, half-life of 4-chlorophenolPhotocatalysis; Photoreactor; TiO2 thin films; 4-Chloropheno
First Page Preview
Evaluation of a novel Carberry type photoreactor for the degradation of organic pollutants in water
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 188, Issues 2–3, 20 May 2007, Pages 169–176
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us