Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution

Jin, Xiaoying and Zheng, Min and Sarkar, Binoy and Naidu, Ravi and Chen, Zuliang (2016) Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution. Applied Clay Science, 134 (2). pp. 89-94. ISSN 0169-1317

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Abstract

This study examines the modification of bentonite with humic acid (HAB) as a novel sorbent for simultaneous removal of Cu(II) and 2,4-dichlorophenol (2,4-DCP) from aqueous solution. Batch experiments were conducted employing either single sorption or simultaneous sorption of Cu(II) and 2,4-DCP. Results indicated that the sorption of either Cu(II) or 2,4-DCP onto HAB was little influenced by the presence of the other contaminant. The amount of sorption was 22.40 mg g− 1 and 14.23 mg g− 1 for Cu(II) and 2,4-DCP, respectively at 30 °C. Scanning electron microscopy (SEM) indicated that HA was immobilized on the surface of bentonite. Energy dispersive spectroscopic (EDS) analysis indicated that Cu(II) was sorbed onto HAB. X-ray diffraction (XRD) analysis demonstrated that the crystalline structure of bentonite did not change after being modified with HA. Fourier-transform infrared (FTIR) spectra confirmed that new bonds and band intensity emerged after the sorption of Cu(II) and 2,4-DCP onto the HAB. These suggest that simultaneous sorption of 2,4-DCP and Cu(II) onto HAB could occur through: firstly, a mechanism that partitions between 2,4-DCP and HA; and secondly, the ion-exchange mechanism between Cu(II) and bentonite.

Item Type:
Journal Article
Journal or Publication Title:
Applied Clay Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1907
Subjects:
ID Code:
140656
Deposited By:
Deposited On:
22 Jan 2020 14:20
Refereed?:
Yes
Published?:
Published
Last Modified:
17 Jun 2020 07:48