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Adsorption of chromate and para-nitrochlorobenzene on inorganic–organic montmorillonite
Abstract Batch studies of chromate and para-nitrochlorobenzene (p-NCB) on montmorillonite modified by poly(hydroxo aluminium) ions (Al) and cetyl trimethylammonium bromide (CTMAB) are reported. The amounts adsorbed decreased in the order Al-CTMA-mont>CTMA-mont>Al-mont>montmorillonite. Adsorption of chromate on Al-CTMA-mont reached a maximum at pH=4 while p-NCB was pH independent. The adsorption kinetics could be described by the pseudo-second-order model. The adsorption rates for chromate and p-NCB were 9.73 and 5.78mgg−1 min−1, respectively. The adsorption capacity of chromate and p-NCB on Al-CTMA-mont calculated by the Langmuir model was 2.3×10−4 and 2.2×10−4 mol/g, the values of the adsorption energy of the Dubinin-Radushkevitch (D-R) model were 13.9 and 7.8kJ/mol. These results implied that the chromate adsorption proceeded as chemisorption, mainly by ion exchange whereas p-NCB was bound by van der Waals forces.
Adsorption of chromate and para-nitrochlorobenzene on inorganic–organic montmorillonite
Abstract Batch studies of chromate and para-nitrochlorobenzene (p-NCB) on montmorillonite modified by poly(hydroxo aluminium) ions (Al) and cetyl trimethylammonium bromide (CTMAB) are reported. The amounts adsorbed decreased in the order Al-CTMA-mont>CTMA-mont>Al-mont>montmorillonite. Adsorption of chromate on Al-CTMA-mont reached a maximum at pH=4 while p-NCB was pH independent. The adsorption kinetics could be described by the pseudo-second-order model. The adsorption rates for chromate and p-NCB were 9.73 and 5.78mgg−1 min−1, respectively. The adsorption capacity of chromate and p-NCB on Al-CTMA-mont calculated by the Langmuir model was 2.3×10−4 and 2.2×10−4 mol/g, the values of the adsorption energy of the Dubinin-Radushkevitch (D-R) model were 13.9 and 7.8kJ/mol. These results implied that the chromate adsorption proceeded as chemisorption, mainly by ion exchange whereas p-NCB was bound by van der Waals forces.
Adsorption of chromate and para-nitrochlorobenzene on inorganic–organic montmorillonite
Hu, Bingjie (author) / Luo, Hanjin (author) / Chen, Hua (author) / Dong, Tingting (author)
Applied Clay Science ; 51 ; 198-201
2010-11-12
4 pages
Article (Journal)
Electronic Resource
English
Adsorption of chromate and para-nitrochlorobenzene on inorganic–organic montmorillonite
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