Adsorption of crystal violet with diatomite earth&carbon by a modification of hydrothermal carbonization process

作者：Zhang Yanzhuo^*; Li Jun; Chen Guanghui; Bian Wei; Lu Yun; Li Wenjing; Zheng Zhaoming; Cheng Xiaojie

来源：Water Science and Technology, 2016, 73(6): 1463-1471.

DOI：10.2166/wst.2015.625

• adsorption
• crystal violet
• diatomite earth&carbon
• hydrothermal carbonization

The high colority and difficulty of decolorization are the most important tasks on printing and dyeing wastewater. This study investigates the ability of diatomite earth&carbon (DE&C) as an adsorbent to removal crystal violet (CV) from aqueous solutions. Fourier transform infrared spectroscopy results indicate the importance of functional groups during the adsorption of CV. The obtained N-2 adsorption-desorption isotherm values accord with well IUPAC type II. Our calculations determined a surface area of 73.15 m(2) g(-1) for DE&C and an average pore diameter of 10.56 nm. Equilibrium data of the adsorption process fitted very well to the Langmuir model (R-2>0.99). The results of kinetics study showed that the pseudo-second-order model fitted to the experimental data well. The thermodynamic parameters were also evaluated. Delta H degrees <0, Delta S degrees >0 and Delta G degrees <0 demonstrated that the adsorption process was spontaneous and exothermic for dye. Furthermore the positive value of Delta S degrees reflected good affinity of the CV dye.

• 出版日期2016-3
• 单位北京工业大学