Adsorption and photocatalysis for methyl orange and Cd removal from wastewater using TiO 2 /sewage sludge-based activated carbon nanocomposites | Zendy

Mohamed Nageeb Rashed | Zendy; Mahmoud Abd El-Daim El-Taher | Zendy; Abdullilah Abdou | Zendy

Open Access

Adsorption and photocatalysis for methyl orange and Cd removal from wastewater using TiO ₂ /sewage sludge-based activated carbon nanocomposites

Author(s) -

Mohamed Nageeb Rashed,

Mahmoud Abd El-Daim El-Taher,

Abdullilah Abdou

Publication year - 2017

Publication title -

royal society open science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.84

H-Index - 51

ISSN - 2054-5703

DOI - 10.1098/rsos.170834

Subject(s) - photocatalysis , adsorption , methyl orange , activated carbon , wastewater , activated sludge , sewage , sewage treatment , sewage sludge , nanocomposite , chemistry , environmental chemistry , pulp and paper industry , waste management , materials science , chemical engineering , environmental engineering , environmental science , nanotechnology , organic chemistry , catalysis , engineering

Nanocomposite TiO 2 /ASS (TiO 2 nanoparticle coated sewage sludge-based activated carbon) was synthesized by the sol-gel method. The changes in surface properties of the TiO 2 /ASS nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray fluorescence. The prepared TiO 2 /ASS nanocomposite was applied for simultaneous removal of methyl orange dye (MO) and Cd 2+ from bi-pollutant solution. The factors influencing photocatalysis (TiO 2 : ASS ratios, initial pollutant concentrations, solution pH, nanocomposite dosage and UV irradiation time) were investigated. The results revealed that high removal efficiency of methyl orange dye (MO) and Cd 2+ from bi-pollutant solution was achieved with TiO 2 /ASS at a ratio (1 : 2). The obtained results revealed that degradation of MO dye on the TiO 2 /ASS nanocomposite was facilitated by surface adsorption and photocatalytic processes. The coupled photocatalysis and adsorption shown by TiO 2 /ASS nanocomposite resulted in faster and higher degradation of MO as compared to MO removal by ASS adsorbent. The removal efficiency of MO by ASS adsorbent and TiO 2 /ASS (1 : 2) nanocomposite at optimum pH value 7 were 74.14 and 94.28%, respectively, while for Cd 2+ it was more than 90%. The experimental results fitted well with the second-order kinetic reaction.

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