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| Adsorption and Degradation of 1, 2, 4-Trichlorobenzene by Activated Carbon-Microorganisms in Soil |
| Received:April 23, 2015 |
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| KeyWord:activated carbon;1,2,4-trichlorobenzene;adsorption isotherm;adsorption kinetics |
| Author Name | Affiliation | | SONG Lei | School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China | | XING Li | School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
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| Abstract: |
| 1,2,4-trichlorobenzene(1,2,4-TCB) has been used for a solvent, a degreaser, a lubricant and a chemical intermediate, thus causing environmental pollution. This paper was aimed to evaluate the degradability and adsorption of 1,2,4-TCB by mixed bacteria fixed on activated carbon in soil. The mixture of bacteria uses 1,2,4-TCB as the sole carbon source. The experimental conditions were 30 ℃ of temperature, 5-9.6 μg·g-1 of 1,2,4-TCB, and 0.4 g of coconut-shell activated carbon(< 1 mm). During 23 days, the degradation of 1, 2, 4-TCB by the activated carbon-bacteria was up to 48.1% and the maximum adsorption capacity of 1,2,4-TCB was 0.215 mg·g-1. The degradability of 1,2,4-TCB in soil was greater under activated carbon-bacteria than under activated carbon alone. Langmuir adsorption model described the adsorption process very well. The adsorption kinetics of 1,2,4-TCB by activated carbon-bacteria was best fitted to the pseudo-second-order kinetic model. Surface adsorption and pore filling of activated carbon might be two main processes of 1,2,4-TCB adsorption by activated carbon-bacteria. |
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