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Synthesis of cerium-doped MCM-41 for ozonation of p-chlorobenzoic acid in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
46401 46439 2012 9 PDF Available
Title
Synthesis of cerium-doped MCM-41 for ozonation of p-chlorobenzoic acid in aqueous solution
Abstract

Cerium-doped MCM-41 (Ce-MCM-41) was prepared by a hydrothermal method and its catalytic activity for ozonation of p-chlorobenzoic acid (p-CBA) in aqueous solution was studied. For comparison, cerium-loaded MCM-41 (Ce/MCM-41) was prepared by a dipping method. Ce-MCM-41 was characterized by the low and wide angle X-ray powder diffraction (XRD), nitrogen adsorption–desorption, transmission electron microscopy (TEM) and ultraviolet–visible diffuse reflection spectrum (UV–vis DRS). The results showed that the material retained the highly ordered mesopore structure of MCM-41 and had a surface area of 852 m2 g−1. Cerium was incorporated into the framework of MCM-41, locating at tetrahedrally coordinated sites. The cerium doping content, initial pH of aqueous solution and reaction temperature played important roles in catalytic ozonation of p-CBA. Under the chosen conditions (1.39 mg l−1 ozone dosage, 10 mg l−1p-CBA solution and 1 g l−1 catalyst dosage), the high mineralization rate (86%) was achieved by Ce-MCM-41/O3 process at 60 min reaction time, only 52% by O3 alone. The combination of Ce-MCM-41 and O3 exhibited a significant synergetic effect. Ce-MCM-41 showed the better activity and stability than cerium-loaded MCM-41(Ce/MCM-41) during catalytic ozonation of p-CBA, its cerium leaching was greatly reduced (only 0.085 mg l−1) and below detection limit after being reused, compared with that of Ce/MCM-41 (0.44 mg l−1) with the presence of the same theoretical cerium content. TOC removal rate slightly decreased from 86% to 81% and kept stable after Ce-MCM-41 being re-utilized two times, which illustrated that Ce-MCM-41 was a kind of promising catalyst for ozonation of p-CBA. The addition of Ce-MCM-41 significantly improved ozone decomposition into HO in aqueous solution and reduced ozone concentration in equilibrium.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► This work solves the leaching problems of catalyst's active components. ► Ce-MCM-41 was first used as a heterogeneous catalyst in ozonation process. ► Ce-MCM-41 showed the better activity and stability than Ce/MCM-41. ► Cerium leaching of Ce-MCM-41 was greatly reduced compared with that of Ce/MCM-41. ► Cerium leaching of Ce-MCM-41 was below detection limit after being reused.

Keywords
Ce-MCM-41; Catalytic ozonation; p-Chlorobenzoic acid
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Synthesis of cerium-doped MCM-41 for ozonation of p-chlorobenzoic acid in aqueous solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 115–116, 5 April 2012, Pages 16–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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