title: Adsorption of crystal violet with diatomite earth&carbon by a modification of hydrothermal carbonization process.
abstract: 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 N2 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. ΔH° <0, ΔS° > 0 and ΔG° < 0 demonstrated that the adsorption process was spontaneous and exothermic for dye. Furthermore the positive value of ΔS° reflected good affinity of the CV dye.
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Yanzhuo
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Guanghui
authors.initials: G
authors.lastname: Chen
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Bian
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Yun
authors.initials: Y
authors.lastname: Lu
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Wenjing
authors.initials: W
authors.lastname: Li
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Zhaoming
authors.initials: Z
authors.lastname: Zheng
authors.affiliation: The College of Architecture and Civil Engineering, The Key Laboratory of Beijing for Water Quality Science & Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China E-mail: 83995983@qq.com.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Cheng
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D007692:Diatomaceous Earth / Q000737:chemistry*; D005840:Gentian Violet / Q000737:chemistry*; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D002244:Carbon; D004396:Coloring Agents; D007692:Diatomaceous Earth; D005840:Gentian Violet; D062065:Wastewater; D014874:Water Pollutants, Chemical; C033787:diatomite