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

作者：Cao Jia Shun; Lin Jun Xiong; Fang Fang^*; Zhang Ming Ting; Hu Zhi Rong

来源：Bioresource Technology, 2014, 163: 199-205.

DOI：10.1016/j.biortech.2014.04.046

• Adsorption
• Modified walnut shell (MWNS)
• Reactive brilliant red K-2BP (K-2BP)
• Kinetics
• Thermodynamics

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.

• 出版日期2014-7
• 单位河海大学