A novel L-Histidine (C, N) codoped-TiO2-CdS nanocomposite for efficient visible photo-degradation of recalcitrant compounds from wastewater

Hadis Zangeneh; Ali Akbar Zinatizadeh; Sirus Zinadini; Mostafa Feyzi; Ezzat Rafiee; Detlef W Bahnemann

doi:10.1016/j.jhazmat.2019.02.049

A novel L-Histidine (C, N) codoped-TiO₂-CdS nanocomposite for efficient visible photo-degradation of recalcitrant compounds from wastewater

J Hazard Mater. 2019 May 5:369:384-397. doi: 10.1016/j.jhazmat.2019.02.049. Epub 2019 Feb 14.

Authors

Hadis Zangeneh¹, Ali Akbar Zinatizadeh², Sirus Zinadini¹, Mostafa Feyzi³, Ezzat Rafiee⁴, Detlef W Bahnemann⁵

Affiliations

¹ Environmental Research Center (ERC), Department of Applied Chemistry, Razi University, P.O. Box: 67149, Kermanshah, Iran.
² Environmental Research Center (ERC), Department of Applied Chemistry, Razi University, P.O. Box: 67149, Kermanshah, Iran. Electronic address: zinatizadeh@razi.ac.ir.
³ Department of Physical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, 67149, Iran.
⁴ Department of Inorganic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, 67149, Iran.
⁵ Institut fuer Technische Chemie, Leibniz Universität Hannover, Callinstrasse 3, D-30167 Hannover, Germany.

PMID: 30784968
DOI: 10.1016/j.jhazmat.2019.02.049

Abstract

The aim of current study is to synthesis novel visible driven photocatalysts (L-Histidine (C, N) codoped-TiO₂-CdS) with different loadings of L-Hisitdine (1, 2, and 3 wt.%) and CdS (1:9, 7:1, and 1:5 mass ratios of CdS to TiO₂). Then, their application for photo-degradation of methyl orange (MO) and biologically treated palm oil mill effluent (POME) were studied. The structure, optical properties, and morphology of the prepared nanocomposites were also characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR), photoluminescence spectroscopy (PL), and diffuse reflectance spectra (DRS). DRS results indicated that all the modified samples with different L-Hisitdine and CdS loadings showed a red shift to visible region. The results of photo-degradation experiments showed that L-Hisitdine with a weight fraction of 2% and mass ratio of TiO₂ to CdS of 7:1 were the optimum amount of the modifiers in the photocatalyst network. The PL intensity of the photocatalyst decreased with addition of L-Hisitdine and CdS nanoparticles due to a decrease in e^-/h⁺ recombination. The effects of organic pollutant concentration, initial pH, catalyst concentration, and irradiation time on the photo-degradation process of MO and POME were studied using full faced centered central composite design (CCFD) under response surface methodology (RSM). The obtained results showed that MO was completely removed at initial concentration of 10 mg/L, acidic pH, and catalyst loading of 1.5 g/L after 120 min. The complete degradation of biologically treated POME was achieved at original pH, 300 mg/L of chemical oxygen demand (COD) concentration, catalyst loading of 2 g/L, and irradiation time of 2 h.

Keywords: Biologically treated palm oil mill effluent (POME); Central composite design; L-Hisitidine-TiO(2)-CdS; Nonbiodegradable compounds; Visible driven photocatalyst.

Publication types

Research Support, Non-U.S. Gov't