Title: ADSORPTION AND CATALYTIC OXIDATION OF METHYLENE BLUE BY IRON-LOADED ACTIVATED CARBON DERIVED FROM BREWER'S YEAST

Authors: Kang, J (Kang, Jin); Yang, YQ (Yang, Yinqun); Cai, JX (Cai, Junxiong); Hou, HB (Hou, Haobo)

Source: FRESENIUS ENVIRONMENTAL BULLETIN  Volume: 27 Issue: 12A  Pages: 9258-9266 Published: 2018

Abstract:  The performances and mechanisms of adsorption and catalytic oxidation of methylene blue (MB) by iron loaded activated carbon (Fe/AC) derived from brewer's yeast were systematically investigated in this study. 93% of the MB adsorption was obtained within 1.0 h. The solution pH had no influence on the adsorption capacity. The maximum MB uptake was estimated to be 120.09 mg/g. The adsorption kinetics and isotherm were well described by pseudo second order kinetics and Langmuir isotherm, respectively, indicating that chemical adsorption is the main adsorption mechanism. The TOC removal efficiencies increased from 20% and 28% in oxidation of MB by O-3 and UV/O-3 to 28% and 70% in oxidation of MB by O-3/Fe/AC and UV/O-3/Fe/AC, respectively, after reaction 5 h, demonstrating the high catalytic oxidation activity of Fe/AC. Fourier transform infrared spectroscopy (FTIR) and X ray photoelectron spectroscopy (XPS) studies revealed that adsorption and catalytic oxidation of MB occurred on the Fe/AC surface and facilitated each other. Oxygen containing groups including Fe-O, CO, COC, COH and COOH in Fe/AC were involved in the MB adsorption. The presence of Fe/AC in oxidation of MB by O-3 and UV/O-3 promoted the conversion of ozone adsorbed on its surface to center dot OH radicals for mineralizing MB, while the oxidation process stimulated the generation of oxygen containing groups on the Fe/AC surface in favor of MB adsorption. Once the adsorbed MB was mineralized, the chemical adsorption mechanism would motivate aqueous MB to transfer and be adsorbed onto the Fe/AC surface for oxidation.

Accession Number: WOS: 000455562500067

Document type: Article

Language: English

Keywords: Fe/AC; MB; Adsorption; Catalytic Oxidation; FTIR; XPS

Address of reprint author:

Cai, JX (reprint author), Hubei Prov Res Inst Environm Sci, 338 Bayi Rd, Wuhan 430072, Hubei, Peoples R China.

E-mail: cjx@hbepb.gov.cn

Addresses:

[Kang, Jin; Cai, Junxiong; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Hubei, Peoples R China.

[Kang, Jin; Cai, Junxiong] Hubei Prov Res Inst Environm Sci, 338 Bayi Rd, Wuhan 430072, Hubei, Peoples R China.

[Yang, Yinqun] Yangtze River Water Resources Protect Inst, Wuhan 430051, Hubei, Peoples R China.

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