- Title
- Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution
- Creator
- Jin, Xiaoying; Zheng, Min; Sarkar, Binoy; Naidu, Ravi; Chen, Zuliang
- Relation
- Applied Clay Science Vol. 134, p. 89-94
- Publisher Link
- http://dx.doi.org/10.1016/j.clay.2016.09.036
- Publisher
- Elsevier BV
- Resource Type
- journal article
- Date
- 2016
- Description
- 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.
- Subject
- modified bentonite; humic acid; simultaneous sorption; mixed contaminants
- Identifier
- http://hdl.handle.net/1959.13/1446430
- Identifier
- uon:42866
- Identifier
- ISSN:0169-1317
- Language
- eng
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