Abatement of chromium by adsorption on nanocrystalline zirconia using response surface methodology

被引:67
作者
Gusain, Deepak [1 ]
Bux, Faizal [2 ]
Sharma, Yogesh Chandra [1 ]
机构
[1] Banaras Hindu Univ, Dept Chem, Indian Inst Technol, Varanasi 221005, Uttar Pradesh, India
[2] Durban Univ Technol, Inst Water & Wastewater Technol, ZA-4000 Durban, South Africa
关键词
Nanocrystalline zirconia; Chromium; Removal; Response surface methodology; HEXAVALENT CHROMIUM; AQUEOUS-SOLUTIONS; ACTIVATED CARBON; WASTE-WATER; SOL-GEL; REMOVAL; OPTIMIZATION; VI; CAPACITY; KINETICS;
D O I
10.1016/j.molliq.2014.04.026
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Application of nanocrystalline zirconia was investigated for the removal of chromium from aqueous solutions. The nanozirconia was synthesized by 'precipitation method'. The parameters namely initial concentration (5-65 ppm), pH (0.5 to 10.5), adsorbent dose (2 to 10 g/l) and temperature (298 K to 318 K) were optimized employing central composite design of response surface methodology. The removal of Cr was most affected by pH, followed by an initial concentration and adsorbent dose. Maximum removal (%) was achieved at an initial concentration of 20 ppm, pH = 3, adsorbent dose = 4 g/l and temperature 313 K. The experimental data were best fitted in Langmuir's isotherm equation and the removal followed pseudo second order kinetics. The mechanism of removal was explained by boundary layer diffusion via intraparticle diffusion and was further confirmed by Boyd plot Thermodynamic parameters revealed that the removal process was spontaneous, endothermic and physiosorptive in nature. Adsorbent was regenerated with hydroxides (0.1 N NaOH, KOH and NH4OH) for further reuse. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:131 / 141
页数:11
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