TY - JOUR

T1 - A novel L-Histidine (C, N) codoped-TiO2-CdS nanocomposite for efficient visible photo-degradation of recalcitrant compounds from wastewater

AU - Zangeneh, Hadis

AU - Zinatizadeh, Ali Akbar

AU - Zinadini, Sirus

AU - Feyzi, Mostafa

AU - Rafiee, Ezzat

AU - Bahnemann, D.W.

N1 - Funding Information: The authors would like to thank Kermanshah’s Municipal Water and Wastewater Company for their financial support. The authors would also like to acknowledge Iran National Science Foundation (INSF) for the support provided for this research work. The authors also wish to thank Razi University, Iran, for the equipped lab provided. Appendix A

PY - 2019/5/5

Y1 - 2019/5/5

N2 - The aim of current study is to synthesis novel visible driven photocatalysts (L-Histidine (C, N) codoped-TiO 2-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 TiO 2). 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 TiO 2 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.

AB - The aim of current study is to synthesis novel visible driven photocatalysts (L-Histidine (C, N) codoped-TiO 2-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 TiO 2). 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 TiO 2 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.

KW - Biologically treated palm oil mill effluent (POME)

KW - Central composite design

KW - L-Hisitidine-TiO -CdS

KW - Nonbiodegradable compounds

KW - Visible driven photocatalyst

UR - http://www.scopus.com/inward/record.url?scp=85061608782&partnerID=8YFLogxK

U2 - 10.1016/j.jhazmat.2019.02.049

DO - 10.1016/j.jhazmat.2019.02.049

M3 - Article

VL - 369

SP - 384

EP - 397

JO - Journal of hazardous materials

JF - Journal of hazardous materials

SN - 0304-3894

ER -