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Photocatalytic degradation of paraquat dichloride over ceo2-modified tio2 nanotubes and the optimization of parameters by response surface methodology

Eleburuike, Naimat Abimbola and Wan Abu Bakar, Wan Azelee and Ali, Rusmidah and Omar, Muhammad Firdaus (2016) Photocatalytic degradation of paraquat dichloride over ceo2-modified tio2 nanotubes and the optimization of parameters by response surface methodology. RSC Advances, 6 (106). pp. 104082-104093. ISSN 2046-2069

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Official URL: http://dx.doi.org/0.1039/c6ra24283a

Abstract

Decontamination of water sources by one-dimensional (1D) nanostructured TiO 2 holds great potential due to their unique electronic and textural properties. In this study, CeO 2 -modi fi ed TiO 2 nanotubes (Ce – TNTs) have been prepared by impregnation of CeO 2 on hydrothermally synthesized TiO 2 nanotubes (TNTs). The catalysts were characterized by XRD, HRTEM, EDX, STEM, EELS, DR-UV/VIS spectroscopy and nitrogen adsorption (NA) analyses. The photocatalytic activities of the synthesized Ce – TNTs were examined on the degradation of paraquat dichloride (PQ) under UV light. The modi fi cation of TNTs with CeO 2 led to an enhancement of the photocatalytic activity. Box – Behnken design (BBD) based on response surface methodology (RSM) was used to optimize three experimental parameters namely; CeO 2 ratio, calcination temperature and catalyst loading. ANOVA of the generated quadratic model yielded a coe ffi cient of determination, R 2 of 0.9926 and probability, P < 0.0001, which con fi rms that the model is suitable for predicting the optimum degradation e ffi ciency of PQ. Based on this model, the calcination temperature and CeO 2 ratio were the most signi fi cant parameters and the interactions between these parameters and the catalyst loading were also signi fi cant. The predicted optimum conditions that would give a maximum of 80.798% degradation of PQ in 4 h were 9.01% CeO 2 ratio, 760.49C calcination temperature and 0.38 g catalyst loading. Validation experiments were conducted in triplicate and an average of 80.27% degradation of PQ was achieved which is in agreement with 80.798% predicted. Under these optimum conditions, TOC analysis showed that 51.10% mineralization of PQ was achieved within 4 h. Therefore, this work further con fi rms that the photocatalytic treatment of organics-contaminated water can be designed and optimized by RSM.

Item Type:Article
Additional Information:RADIS System Ref No:PB/2016/05547
Subjects:Q Science
Divisions:Science
ID Code:68518
Deposited By: Haliza Zainal
Deposited On:01 Nov 2017 11:42
Last Modified:20 Nov 2017 16:52

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