Title :
Adsorption of Ni2+ from aqueous solutions using chitosan-attapulgite composite as biosorbent
Author :
Jia, Xiaoning ; Zhang, Qingfang
Author_Institution :
Inst. of Petrochem. Technol., Lanzhou Univ. of Technol., Lanzhou, China
Abstract :
A novel chitosan/attapulgite (CTS/APT) composite adsorbent was prepared. Adsorption experiments were carried out as a function of types of adsorbent, ratio, contact time, pH, temperature. It was found that the adsorption capacity of Ni2+ on composite adsorbent was the highest. The composite adsorbent had the highest adsorption efficiency when the ratio was 30 wt%. The adsorption of Ni2+ reached equilibrium within 60 min. The composite adsorbent was particularly effective for the Ni2+ removal at pH 5.0. Evaluation of adsorption process from 288 K to 318 K identified its endothermic nature. Equilibrium data of Ni2+ onto this composite adsorbent was well described by Langmuir isotherm model which indicated a physical adsorption process.
Keywords :
adsorption; composite materials; geochemistry; nickel; pH; Langmuir isotherm model; Ni2+; Ni2+ adsorption capacity; Ni2+ equilibrium data; Ni2+ removal rate; adsorbent function; adsorption efficiency; aqueous solutions; biosorbent; chitosan-attapulgite composite adsorbent; contact time; pH; physical adsorption process; temperature 288 K to 318 K; Data models; Ions; Kinetic theory; Materials; Nickel; Ni2+; attapulgite; chitosan; composite adsorbent;
Conference_Titel :
Geomatics for Integrated Water Resources Management (GIWRM), 2012 International Symposium on
Conference_Location :
Lanzhou, Gansu
Print_ISBN :
978-1-4673-1283-7
DOI :
10.1109/GIWRM.2012.6349605
