Adsorption Characteristics of Modified Wheat Husk for the Removal of a Toxic Dye, Methylene Blue, from Aqueous Solutions

被引：20
作者：
Banerjee, Sushmita [1 ]
Chattopadhyaya, Mahesh C. [1 ]
Uma [2 ]
Sharma, Yogesh Chandra [2 ]
机构：
[1] Univ Allahabad, Dept Chem, Allahabad 211002, Uttar Pradesh, India
[2] Indian Inst Technol, Dept Chem, Varanasi 221005, Uttar Pradesh, India
来源：
JOURNAL OF HAZARDOUS TOXIC AND RADIOACTIVE WASTE | 2014年 / 18卷 / 01期
关键词：
Adsorption; Isotherm; Kinetics; Methylene blue; Wheat husk;
D O I：
10.1061/(ASCE)HZ.2153-5515.0000191
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Adsorption characteristics of modified wheat husk for the removal of a toxic cationic dye, methylene blue, from aqueous solutions have been investigated. The adsorbent, wheat husk, was characterized by Fourier transform infrared spectra (FTIR) and scanning electron microscopy (SEM) for its functional group and surface characteristics. The removal decreased by increasing temperature from 303 to 373 K. The removal was found to be pH dependent, and it decreased from 96.2 to 40.7% by varying the pH of the solution from 4.5 to 9.5. It was observed that 93.4% removal of methylene blue was achieved at an initial dye concentration of 13.37 x 10(-2) mol / L at 303 K. Equilibrium adsorption data for the removal of methylene blue were analyzed by Langmuir, Freundlich, and Tempkin isotherm models. Values of thermodynamic parameters viz Delta G degrees, Delta H degrees, and Delta S degrees were determined. The negative value of Delta H degrees confirmed the exothermic nature of removal of methylene blue by adsorption on modified wheat husk. (C) 2014 American Society of Civil Engineers.
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收藏
页码：56 / 63
页数：8
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