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Research articles

ScienceAsia 48 (2022): 588-595 |doi: 10.2306/scienceasia1513-1874.2022.077

Adsorption of Ni2+ on malic acid modified activated carbon from Phragmites australis

Dongmei Hea, Jian Zhanga,*, Zhenxin Shangb, Chenglu Zhangb

ABSTRACT:     To tackle the issue of environmental pollution caused by heavy metal ions, a novel malic acid modified activated carbon (denoted as MA-AC) from (the plant) Phragmites australis has been successfully prepared with high Ni2+ adsorption capacity (38.36 mg/g). The physical and chemical characteristics of MA-AC were evaluated by N2 adsorption/desorption, Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR), and X-ray Photoelectron Spectroscopy (XPS). The results indicated that the MA-AC has more microporous structures and more oxygen bearing functional groups than the unmodified AC (denoted as AC). The Ni2+ adsorption behaviors of the adsorbents were investigated by batch experiments, which indicated that the MA-AC showed 38% higher Ni2+ adsorption capacity than the unmodified AC. The adsorption isotherms and the kinetics of the absorbents agreed well with the Langmuir model and the pseudo-second-order model. The Ni2+ adsorption mechanisms of MA-AC were investigated by FTIR and XPS analyses. The results from the analyses indicated that the enhanced surface adsorption of Ni2+ on MA-AC are attributed to the chemistry between the Ni2+ and the oxygen-containing functional groups on the surface.

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a Department of Chemical Engineering and Materials, Jining University, Shandong 273155 China
b Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100 China

* Corresponding author, E-mail: sduchemzhang@163.com

Received 8 Oct 2021, Accepted 3 Mar 2022