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Adsorption of two azo reactive dyes by tannery sludge activated carbon: effect of temperature and pH
被引:0
|作者:
Geethakarthi, A.
[1
]
Phanikumar, B. R.
[1
]
机构:
[1] VIT Univ, Sch Mech & Bldg Sci, Vellore, Tamil Nadu, India
来源:
Environmental Science and Development
|
2011年
/
4卷
关键词:
activated carbon;
adsorption;
reactive dyes;
tannery;
COLOR REMOVAL;
WASTE-WATER;
HYDROXIDE;
D O I:
暂无
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Adsorption of azo reactive dyes by tannery sludge activated carbon was investigated using CI Reactive Red 31 (RR-31) and CI Reactive Red 2 (RR-2) by batch operation. The Langmuir constants (Q(o) and b) and the Freundlich constant (K-f) increased with increasing temperature. This behavior implied an endothermic process for the reactive dyes. The enthalpy value of adsorption OH) for RR-31 and RR-2 was 8.51 kJ/mol and -1.616 kJ/mol, respectively, indicating that the adsorption of the less charged dyes (RR-2) was mainly physical process, but that of the more charged dyes (RR- 31) was chemical in nature. The optimum system pH of 7.0 +/- 0.3 was maintained even when the solution pH was varied from 2 to 11.
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页码:154 / 157
页数:4
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