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Citation: ZHEN Wei-Jun, QI Xin-Ping, MIN Li-Yuan, LIU Zi-Qiang, LI Zhen-Jiang, PANG Gui-Lin. Adsorption Mechanism of DHAC Modified Bentonite for Phenols in Petroleum Refining Alkali Dreg Waste Water[J]. Chinese Journal of Applied Chemistry, ;2007, 24(1): 80-84. shu

Adsorption Mechanism of DHAC Modified Bentonite for Phenols in Petroleum Refining Alkali Dreg Waste Water

1.
College of Chemistry and Chemical engineering of Xinjiang University, Urumqi 830046

Corresponding author: ZHEN Wei-Jun,
Received Date: 22 December 2005
Available Online: 15 July 2006
Fund Project: 新疆自治区2003年科技攻关和重点科技项目(200332108) (200332108)

DHAC modified bentonite was prepared starting from Xiazijie bentonite of Xinjiang.FTIR spectra showed that DHAC cation ions were intercalated into the layers of bentonite.It was shown that the layers spacing of the modified bentonite was 3.772 nm, which is 2.07 times that of bentonite.SEM images showed that the DHAC modified bentonite particles were looser than that of bentonite, and there were evident erosion trails on the surface of montmorillonite.The isotherm adsorption models of DHAC modified bentonite for volatile phenols was in agreement with Freundlich equation.The adsorption enthalpy of modified bentonite for volatile phenols was -2.64 kJ/mol, indicating that the adsorption was physical adsorption.Because its△G^θ<0, the adsorption reaction was a spontaneous exothermic process.At the ambient temperature, the adsorption kinetic model of modified bentonite for volatile phenols obeyed Bingham and Langmuir adsorption dynamic models.
- bentonite,
- modified bentonite,
- petroleum refining alkali dreg waste water,
- adsorption,
- mechanism
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