Sludge-based activated carbon catalyzed H2O2 oxidation of reactive azo dyes. Issue 5 (23rd February 2021)

• Record Type: Journal Article
• Authors: Meng, Guanhua; Liu, Baohe; Sun, Man; Miao, Qianqian; Ding, Suyun; Zhang, Jiangling; Liu, Zailiang
• Is Part Of: Environmental technology. Volume 42:Issue 5(2021)
• Page Start: 682
• Page End: 693
• Publication Date: 2021-02-23
• Subjects: Sewage sludge -- activated carbon -- Fenton-like oxidation -- reactive yellow 86 -- reactive black 5; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2019.1643409
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: Sludge-based activated carbon (ZAC) was successfully employed as both adsorbent and catalyst for the oxidation process of reactive yellow 86 (RY86) and reactive black 5 (RB5). Physicochemical properties of the prepared sewage sludge-derived activated carbon were evaluated by N2 adsorption/desorption, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The effects of parameters such as initial pH, H2 O2 concentrations, ZAC dosages, dye concentrations and temperature on the removal of RY86 and RB5 were investigated. Kinetics results showed that the adsorption rates of RY86 and RB5 by ZAC can be approximated by the pseudo-first order model, and that the oxidation rates by Behnajady–Modirshahla–Ghanbery (BMG) model. Under the optimum conditions in the experiment, i.e. pH = 6.0, T = 303 K, [H2 O2 ] = 49.5 mmol/L, [ZAC] = 4 g/L, [dyes] = 300 mg/L and t = 150 min, 99%, 88% and 84% of colour, COD and TOC were removed by Fenton -like oxidation for RY86, while for RB5, the three removal rates were 90%, 70% and 62%, respectively, indicating that sludge-based activated carbon can be used as an effective catalyst to oxidation of dyes by H2 O2 from coloured wastewater. GRAPHICAL ABSTRACT: UF0001