A new absorbent by modifying walnut shell for the removal of anionic dye: Kinetic and thermodynamic studies

被引：188
作者：
Cao, Jia-Shun [1 ,2 ]
Lin, Jun-Xiong [2 ]
Fang, Fang [1 ,2 ]
Zhang, Ming-Ting [2 ]
Hu, Zhi-Rong [3 ]
机构：
[1] Hohai Univ, Minist Educ, Key Lab Integrated Regulat & Resource Dev Shallow, Nanjing 210098, Jiangsu, Peoples R China
[2] Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China
[3] EnviroSim Associates Ltd, Hamilton, ON L8P 0A1, Canada
来源：
BIORESOURCE TECHNOLOGY | 2014年 / 163卷
关键词：
Adsorption; Modified walnut shell (MWNS); Reactive brilliant red K-2BP (K-2BP); Kinetics; Thermodynamics; GRANULAR ACTIVATED CARBON; AQUEOUS-SOLUTION; CONGO RED; ADSORPTION BEHAVIOR; COIR PITH; EQUILIBRIUM; ACID; SURFACTANT; WASTE; STRAW;
D O I：
10.1016/j.biortech.2014.04.046
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
A novel, low cost and easy regeneration biosorbent, chem-modified walnut shell (MWNS), was studied to investigate its potential for removal of an anionic dye, reactive brilliant red K-2BP. The MWNS was synthesized with epichlorohydrin and diethylenetriamine as etherifying agent and crosslinking agent, respectively, and its characteristics were performed with Fourier transform infrared spectroscopy, scanning electron microscope, electron dispersive spectroscopy and thermogravimetric analysis. The influences of pH (0.5-11) and adsorbent dosage (0.1-6 g/L) on adsorption capacity of MWNS were evaluated. The maximum K-2BP adsorption capacities (Q.) calculated by best fitting model (Langmuir) were 568.18 mg/g at 313 K, which was almost 10 times than that of raw material. The adsorption kinetic was well confirmed with pseudo-second-order equation. Thermodynamic studies demonstrated adsorption process by MWNS was spontaneous and endothermic. Furthermore, the regeneration capability of MWNS implied MWNS was a cheap, excellent and promising biosorbent for K-2BP removal in azo dye wastewater treatment. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：199 / 205
页数：7
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