Degradation of Ammonia-Nitrogen in Wastewater by TiO2/Pumice Photocatalyst under Solar Light

doi:10.11944/j.issn.1000-0518.2017.08.160474

Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (8): 946-954.DOI: 10.11944/j.issn.1000-0518.2017.08.160474

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Degradation of Ammonia-Nitrogen in Wastewater by TiO₂/Pumice Photocatalyst under Solar Light

PENG Bingxian^a^*(),WANG Xiaoli^a,LIU Ruihan^b,ZHOU Aihong^c

^aCollege of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,China
^bYanbei Middle School of Yongfeng County,Ji'an,Jiangxi 331504,China
^cJiangxi Diyuan Drainage and Water Quality Detection Company Limited,Nanchang 330025,China

Received:2016-11-24 Accepted:2017-02-12 Published:2017-07-25 Online:2017-07-26
Contact: PENG Bingxian
Supported by:
Supported by Scientific and Technological Plan Project of Jiangxi Province(No.20141BBG70008), Natural Science Foundation of Jiangxi Province(No.20142BAB203020)

Abstract

Abstract:

Photocatalytic degradation of ammonia-nitrogen in simulated wastewater was investigated by the TiO₂/pumice photocatalyst under solar light. TiO₂ prepared by the sol-gel method was used as the photocatalyst and immobilized on porous pumice granules. To optimize the photocatalytic reaction, the effect of the initial concentration of ammonia-nitrogen, pH, reaction time and catalyst loading on the ammonia-nitrogen degradation rate were investigated in an aerated reactor. Also, the morphology and chemical structure properties of the prepared catalysts were characterized by scanning electron microscopy(SEM), X-ray fluorescence spectrometer(XRF) and Fourier transform infrared spectroscopy(FT-IR) analyses. The experimental results indicate that the coating ratio of TiO₂ on pumice is 3.71%; the ammonia-nitrogen degradation rate is increased by increasing the pH value, time of solar light irradiation and dose of TiO₂/pumice. After solar light irradiation for 180 min, a high degradation rate of 82.0% and a removal rate of 86.8% are achieved under 500 mg/L ammonia-nitrogen, pH 11 and 30 g/L TiO₂/pumice. Moreover, the NO^-₂ and NO^-₃ pollutes are not found in degradation products. The photocatalyst can be reused at least three consecutive times with about 10.0% decrease on the ammonia-nitrogen degradation rate. The results suggest that the photocatalytic purification by photocatalysis is a rapid, low consumed and effective method for the degradation of ammonia-nitrogen in wastewater.

Key words: solar light, photocatalyst, TiO₂/pumice, degradation, ammonia-nitrogen

PENG Bingxian, WANG Xiaoli, LIU Ruihan, ZHOU Aihong. Degradation of Ammonia-Nitrogen in Wastewater by TiO₂/Pumice Photocatalyst under Solar Light[J]. Chinese Journal of Applied Chemistry, 2017, 34(8): 946-954.

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Degradation of Ammonia-Nitrogen in Wastewater by TiO₂/Pumice Photocatalyst under Solar Light

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