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Synthesis of mesoporous SiO 2 from rice husk for removal of organic dyes in aqueous solution
Author(s) -
Thu Hoang Thi,
Dat Le Tien,
Tuan Vu Anh
Publication year - 2019
Publication title -
vietnam journal of chemistry
Language(s) - English
Resource type - Journals
eISSN - 2572-8288
pISSN - 0866-7144
DOI - 10.1002/vjch.201900012
Subject(s) - methylene blue , adsorption , aqueous solution , mesoporous material , desorption , husk , diffusion , nuclear chemistry , chemistry , reaction rate constant , materials science , chemical engineering , kinetics , organic chemistry , catalysis , botany , thermodynamics , engineering , biology , physics , photocatalysis , quantum mechanics
Mesoporous SiO 2 was prepared from rice husk for removal of methylene blue (MB) from aqueous solution. As‐prepared SiO 2 was characterized by FE‐SEM, TEM, XRD, FT‐IR and N 2 adsorption/desorption isotherm. The effects of SiO 2 dosage and contact time on adsorption of dye were investigated. The optimal dosage of SiO 2 for removing methylene blue was 0.05 g and the removal efficiency of methylene blue reached to 91.9 % after 50 min of adsorption. The adsorption kinetic of methylene blue was studied to understand the mechanism of adsorption process. The kinetic data was analyzed by pseudo‐first‐order, pseudo‐second‐order, and intra‐particle diffusion models. The results showed that rate of adsorption dye followed pseudo‐second‐model with a good regression correlation (R 2 = 0.999), the value of rate constant for adsorption process was calculated as 0.017 (g.mg ‐1 .min ‐1 ) and film diffusion was the rate limiting step. In addition, the cyclic test for as‐prepared SiO 2 was investigated and the removal efficiency was remained at 80.2% at 3 rd cyclic experiment.