Effective Degradation of Nitrotoluenes in Wastewater by Heterogeneous Catalytic Ozonation in the presence of Calcium Oxide (CaO/O3)

LIAO Minhui; CHEN Jida; LI Lingxing; HE Huirong; LU Lansi; FU Denglin

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Effective Degradation of Nitrotoluenes in Wastewater by Heterogeneous Catalytic Ozonation in the presence of Calcium Oxide (CaO/O3)

LIAO Minhui #,CHEN Jida *,LI Lingxing,HE Huirong,LU Lansi,FU Denglin

School of Chemistry and Chemical Engineering, Chongqing University

*Correspondence author

#Submitted by

Subject:

Funding: Sail plan of Guangdong, China （No.No. 2015YT02D025）

Opened online:19 April 2017

Accepted by: none

Citation: LIAO Minhui,CHEN Jida,LI Lingxing.Effective Degradation of Nitrotoluenes in Wastewater by Heterogeneous Catalytic Ozonation in the presence of Calcium Oxide (CaO/O3)[OL]. [19 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4724431

CaO was utilized as a heterogeneous catalyst for ozonation of nitrotoluenes wastewater. Results showed that CaO could promote ozone to generate more hydroxyl radicals (oOHs) that non-selectively degrade p-nitrotoluene (PNT) at an over double oxidation rate of alone ozone in simulated wastewater. A possible degradation pathway of PNT was proposed by gas chromatography/mass spectr ometry (GC/MS) analysis. CaO maintained a good pH and catalytic activity after several repeated use in CaO/O3. The removal efficiency of chemical oxygen demand (CODcr), content of nitrotoluenes, chromaticity and odour reached 97.97 %, 99.96%, 100% and 100% in wastewater at the same time, respectively.

Keywords:Heterogeneous catalytic ozonation; p-Nitrotoluene; Nitrotoluenes Wastewater; Hydroxyl radicals; CaO

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