Adsorption of Heavy Metal Ions from Aqueous Solutions by Bentonite Nanocomposites

作者：Ma, Jing^*; Su, Guojun; Zhang, Xueping; Huang, Wen

来源：Water Environment Research, 2016, 88(8): 741-746.

DOI：10.2175/106143016X14609975747081

• adsorption
• bentonite
• heavy metal ions
• organics

A series of bentonite nanocomposites have been synthesized by modifying bentonite with hexadecyltrimethylammonium bromide (CTMAB) and the common complexing agents, complexone (ethylene diamine tetraacetic acid, EDTA) or mercaptocomplexant (2Mercaptobenzothiazole, MBT). These adsorbents are used to remove heavy metal ions (Cu (2+), Zn (2+), Mn2+, Co2+). The Bent-CTMAB-MBT adsorbed metal ions are higher than Bent-CTMAB-EDTA under the same ion concentration in AAS. Compared with the single ion system, the adsorption of the mixed ion system of Cu (2+), Zn (2+), Mn2+, Co2+ had decreased differently. In the mixed system, the adsorption of Mn2+ is significantly lower, but the adsorption of Cu (2+) was highest. The adsorption sequence of these four metal ions was Cu2+ > Zn (2+) > Mn2+ > Co2+ , and the selective adsorption was closely related to the hydration energy of heavy metal ions. We could remove more metal ions in different stages with the adsorption sequence.

• 出版日期2016-8-1
• 单位湘潭大学