Application of fly ash for adsorptive removal of malachite green from aqueous solutions

被引：22
作者：
Dubey, Shikha [1 ]
Uma [1 ]
Sujarittanonta, Lavanchawee [2 ]
Sharma, Yogesh Chandra [1 ]
机构：
[1] Banaras Hindu Univ, Dept Chem, Indian Inst Technol, Varanasi 221005, Uttar Pradesh, India
[2] Silpakorn Univ Int Coll, Bangkok, Thailand
来源：
DESALINATION AND WATER TREATMENT | 2015年 / 53卷 / 01期
关键词：
Isotherm; Adsorption; Kinetics; Fly ash; Malachite green; WASTE-WATER; BASIC-DYES; CARBON; EQUILIBRIUM; SORPTION; BAGASSE; LEAF;
D O I：
10.1080/19443994.2013.846552
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Present study investigates the adsorption of malachite green (MG) on fly ash. Batch adsorption experiments were performed to evaluate the influence of various experimental parameters like initial concentration and contact time, adsorbent dose, and pH of solution on the removal of MG. Adsorption of MG followed pseudo-second-order kinetics. Intra-particle diffusion seems to control the removal of MG. Isotherms for the adsorption of MG onto fly ash is also investigated. Adsorption of MG on fly ash is favorably influenced by an increase in the temperature. Values of the change in enthalpy (Delta H degrees = 2.87 kcal mol(-1)), and change in entropy (Delta S degrees = 4.99 kcal mol(-1) K-1) for MG adsorption on fly ash were positive. The high negative value of change in Gibbs free energy (Delta G degrees = 1.76 kcal mol(-1)) indicates the feasible and spontaneous adsorption of MG on fly ash. The surface physico-chemical characteristic of adsorbent fly ash was studied in an effort to establish a quantitative understanding of removal of the selected dye MG by adsorption. Results showed that the fly ash has a pH(zpc) value of 7.96.
引用
收藏
页码：91 / 98
页数：8
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