Facile preparation of multiphosphonic acid functionalised multi-walled carbon nanotubes for enhanced adsorption properties for heavy metal ions from wastewaters

[摘要] This work presents facile preparation processes of multiphosphonic acid functionalised multi-walled carbon nanotubes (HEDP-MWCNTs and ATMP-MWCNTs), which have been characterised by FT-IR, XPS, X-ray diffraction, TGA, and SEM, and have employed for heavy metal ions adsorption. The adsorption properties of MWCNTs, HEDP-MWCNTs, and ATMP-MWCNTs for gold ions, cadmium ions, copper ions, lead ions, nickel ions, cobalt ions, zinc ions, and chromium ions have been investigated, the experimental results reveal that the functionalised samples HEDP-MWCNTs and ATMP-MWCNTs have excellent adsorption properties for Pb(II) and Au(III), respectively. The investigation results on their adsorption selectivity represent that in the binary heavy metal ion systems, HEDP-MWCNTs/ATMP-MWCNTs has displayed a strong affinity for Pb(II)/Au(III) and even could exhibit 100% selectivity while coexisting with copper ions, nickel ions, cobalt ions, zinc ions, chromium ions, or cadmium ions. Furthermore, the adsorption kinetics of HEDP-MWCNTs for Pb(II) and ATMP-MWCNTs for Au(III) have also been studied at different solution temperatures. All these research work results show that two novel functionalised adsorbents HEDP-MWCNTs and ATMP-MWCNTs have shown excellent adsorption properties for heavy metal ions and they can be used in wastewater treatment, especially for lead/gold ions removal.

[学科分类] 计算机科学（综合）

[关键词] gold;scanning electron microscopy;copper;nanofabrication;Fourier transform spectra;thermal analysis;infrared spectra;chromium;X-ray diffraction;wastewater treatment;cadmium;cobalt;adsorption;carbon nanotubes;nickel;X-ray photoelectron spectra;chemical engineering;copper ions;lead ions;nickel ions;cobalt ions;zinc ions;chromium ions;functionalised samples HEDP-MWCNTs;binary heavy metal ion systems;cadmium ions;adsorbents HEDP-MWCNTs;multiphosphonic acid;multiwalled carbon nanotubes;facile preparation processes;heavy metal ions adsorption;Pb;Au