Polyethyleneimine-carbon nanotube polymeric nanocomposite adsorbents for the removal of Cr6+ from water

被引：31

作者：

Sambaza, Shepherd S. ^{[1
,2
]}

Masheane, Monaheng L. ^{[1
,2
]}

Malinga, Soraya P. ^{[1
,2
]}

Nxumalo, Edward N. ^{[3
]}

Mhlanga, Sabelo D. ^{[3
]}

机构：

[1] Univ Johannesburg, Dept Appl Chem, POB 17011, ZA-2028 Johannesburg, South Africa

[2] Univ Johannesburg, DST Mintek Nanotechnol Innovat Ctr, POB 17011, ZA-2028 Johannesburg, South Africa

[3] Univ South Africa, Coll Sci Engn & Technol, Nanotechnol & Water Sustainabil Res Unit, ZA-1709 Johannesburg, South Africa

来源：

PHYSICS AND CHEMISTRY OF THE EARTH | 2017年 / 100卷

关键词：

Carbon nanotubes; Chromium (VI); Nanocomposite polymers; Polyethyleneimine; Water treatment; ACTIVATED CARBON; HEAVY-METALS; ADSORPTION; TEMPERATURE; CATALYSTS; IONS;

D O I：

10.1016/j.pce.2016.08.002

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This work reports on the synthesis of multi-walled carbon nanotubes (MWCNTs) and their use in branched polyethyleneimine-multiwalled carbon nanotube (PEI-MWCNT) polymeric nanocomposite adsorbents for the removal of Cr6+ from contaminated water. The nanostructured materials were characterized using TEM, Raman, FTIR, BET surface area and zeta potential measurements. TEM confirmed the average diameter of the MWCNTs to be 25 nm. The point of zero-charge of PEI was at pH 8 and that of PEI-MWCNTs was at pH 7.7. FTIR analysis confirmed the formation of a new bond (-C=O at 1716 cm(-1)) between the functional groups on the MWCNTs and PEI. Batch adsorption and kinetic studies showed that the PEI-MWCNT nanocomposite materials were more efficient in the removal of Cr6+ solution from water samples. The optimum conditions for adsorption were pH <= 4, contact time of 60 min. When the PEI-MWCNT dosage was increased the adsorption capacity increased. The kinetic adsorption data obtained for Cr6+ solution followed pseudo-second order model. The adsorption of Cr6+ solution reached equilibrium within 60 min of contact time with a removal of 99%. The adsorbents were effective even after 5 cycles of use. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：236 / 246

页数：11

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