Removal of humic acid from aqueous solution by cetylpyridinium bromide
modified zeolite |
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Authors: | Yanhui Zhan Zhiliang Zhu Jianwei Lin Yanling Qiu and Jianfu Zhao |
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Institution: | 1. State Key Laboratory of Pollution Control and Resource Reuse,Tongji University,Shanghai 200092,China 2. College of Marine Science,Shanghai Ocean University,Shanghai 201306,China |
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Abstract: | Natural zeolite was modified by loading cetylpyridinium bromide (CPB) to create more e cient sites for humic acid (HA) adsorption.
The natural and CPB modified zeolites were characterized with X-ray di raction, field emission scanning electron microscopy, Fourier
transform infrared spectroscopy and elemental analysis. The e ects of various experimental parameters such as contact time, initial HA
concentration, solution pH and coexistent Ca2+, upon HA adsorption onto CPB modified zeolites were evaluated. The results showed
that natural zeolite had negligible a nity for HA in aqueous solutions, but CPB modified zeolites exhibited high adsorption e ciency
for HA. A higher CPB loading on natural zeolites exhibited a larger HA adsorption capacity. Acidic pH and coexistent Ca2+ were
proved to be favorable for HA adsorption onto CPB modified zeolite. The kinetic process was well described by pseudo second-order
model. The experimental isotherm data fitted well to Langmuir and Sips models. The maximum monolayer adsorption capacity of CPB
modified zeolite with surfactant bilayer coverage was found to be 92.0 mg/g. |
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Keywords: | modified zeolite cetylpyridinium bromide humic acid |
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