Citation: GENG Aifang, ZHAI Qingzhou, LIU Heng, ZHANG Yi'nan. Adsorption of Basic Dye Brilliant Green by Biluochun Green Tea[J]. Chinese Journal of Applied Chemistry, ;2017, 34(11): 1336-1342. doi: 10.11944/j.issn.1000-0518.2017.11.160522 shu

Adsorption of Basic Dye Brilliant Green by Biluochun Green Tea

Research Center for Nanotechnology, Changchun University of Science and Technology, Changchun 130022, China

Corresponding author: ZHAI Qingzhou, zhaiqingzhou@163.com
Received Date: 27 December 2016
Revised Date: 22 February 2017
Accepted Date: 12 April 2017

Figures(7)

In order to discuss the possibility of application of Biluochun tea to the adsorption of brilliant green(BG), the optimum adsorption of BG by Biluochun green tea was studied. When the initial solution pH is 4.1, the mass ratio of BG/tea is 833:1, contact time is 45 min and the temperature is (25±1)℃, the adsorption rate of BG by the tea reaches 80%, and the adsorption capacity is 0.96 mg/g. Studies on three desorption agents, sodium hydorxide, acetic acid, and hydrochloric acid show that sodium hydroxide is the optimal desorption agent and the highest desorption rate reaches 93.20% in 1.5 h. The adsorption process fits the Langmuir isotherm adsorption equation in a single molecular layer adsorption mode. The thermodynamic parameters of adsorption process, free energe change ΔG < 0, the enthalpy change ΔH=102.32 kJ/mol>0, the entropy change ΔS=0.33 kJ/(mol·K)>0, indicate that the adsorption process is a spontaneous endothermic process with increasing entropy.
- brilliant green,
- adsorption,
- Biluochun green tea,
- thermodynamics
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