Preparation of composite adsorbents of activated carbon supported MgO/MnO2 and adsorption of Rhodamine B | Zendy

Xiangfeng Yue | Zendy; Jianhai Zhao | Zendy; Huanhuan Shi | Zendy; Yongzhi Chi | Zendy; Muhammad Salam | Zendy

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Preparation of composite adsorbents of activated carbon supported MgO/MnO2 and adsorption of Rhodamine B

Author(s) -

Xiangfeng Yue,

Jianhai Zhao,

Huanhuan Shi,

Yongzhi Chi,

Muhammad Salam

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.172

Subject(s) - adsorption , activated carbon , calcination , rhodamine b , chemistry , manganese , langmuir adsorption model , composite number , specific surface area , magnesium , nuclear chemistry , bet theory , inorganic chemistry , materials science , catalysis , organic chemistry , composite material , photocatalysis

Activated carbon (AC) was modified by MgO and MnO2 through an impregnation-precipitation-calcination procedure. The batch experiments of adsorption of Rhodamine B (RB) by a modified adsorption material, an MgO-MnO2-AC composite, were carried out and the characteristics of the composite adsorbent were evaluated. The results showed that manganese/magnesium loading changed the surface area, pore volume and increased the number of active adsorption sites of AC. The highest Brunauer-Emmett-Teller (BET) surface area (1,036.18 m2·g−1) was obtained for MgO-MnO2-AC compared with AC. The content of AC loaded with magnesium and manganese was 34.24 and 5.51 mg·g−1 respectively. The adsorption of RB on MgO-MnO2-AC was significantly improved. The maximum adsorption capacity of RB on MgO-MnO2-AC was 16.19 mg·g−1 at 25 °C under the RB concentration of 50 mg·L−1. The adsorption of RB by AC and MgO-MnO2-AC increased with the initial concentration of RB. The adsorption of RB increased first and then decreased when pH was between 3 and 11. The results indicated that the pseudo-second-order kinetic equation and Langmuir equation can be used to describe the adsorption of RB on MgO-MnO2-AC.

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