Shokry Azza, El Tahan Ayman, Ibrahim Hesham, Soliman Moataz, Ebrahim Shaker
Department of Environmental Studies, Institute of Graduate Studies and Research, Alexandria University P.O. Box 832 163 Horreya Avenue, El-Shatby Alexandria Egypt
Department of Physics, Faculty of Science, Tanta University P.O. Box 44519 Tanta Egypt.
RSC Adv. 2019 Nov 28;9(67):39187-39200. doi: 10.1039/c9ra08298k. eCollection 2019 Nov 27.
The aim of this study is to develop a ternary nanocomposite (NC) of polyaniline (PANI)/2-acrylamido-2-methylpropanesulfonic acid (AMPSA)-capped silver nanoparticles (NPs)/graphene oxide quantum dots (PANI/Ag (AMPSA)/GO QDs) as an efficient adsorbent for the removal of the highly toxic hexavalent chromium (Cr(vi)) from polluted water. PANI/Ag (AMPSA)/GO QDs NC was synthesized oxidative polymerization. The effects of pH, adsorbent dose, initial concentration, temperature, contact time, ionic strength and co-existing ions on the removal of Cr(vi) by PANI/Ag (AMPSA)/GO QDs were investigated. The PANI/Ag (AMPSA)/GO QDs NC (25.0 mg) removed 99.9% of Cr(vi) from an aqueous solution containing 60 mg L Cr(vi) ions at pH 2. Energy dispersive X-ray (EDX) and inductively coupled plasma spectrometry (ICP) studies confirmed the adsorption of Cr(vi) and that some of the adsorbed Cr(vi) was reduced to Cr(iii). Cr(vi) removal by the PANI/Ag (AMPSA)/GO QDs NC followed the pseudo-second order kinetic model, and the removal was highly selective for Cr(vi) in the presence of other co-existing ions. In summary, the PANI/Ag (AMPSA)/GO QDs NC has potential as a novel adsorbent for Cr(vi).
本研究的目的是开发一种聚苯胺（PANI）/2-丙烯酰胺基-2-甲基丙烷磺酸（AMPSA）包覆的银纳米颗粒（NPs）/氧化石墨烯量子点（PANI/Ag(AMPSA)/GO QDs）的三元纳米复合材料（NC），作为一种高效吸附剂，用于从污染水中去除剧毒的六价铬（Cr(vi)）。通过氧化聚合合成了PANI/Ag(AMPSA)/GO QDs NC。研究了pH值、吸附剂剂量、初始浓度、温度、接触时间、离子强度和共存离子对PANI/Ag(AMPSA)/GO QDs去除Cr(vi)的影响。在pH为2时，25.0 mg的PANI/Ag(AMPSA)/GO QDs NC从含有60 mg L Cr(vi)离子的水溶液中去除了99.9%的Cr(vi)。能量色散X射线（EDX）和电感耦合等离子体质谱（ICP）研究证实了Cr(vi)的吸附，并且一些吸附的Cr(vi)被还原为Cr(iii)。PANI/Ag(AMPSA)/GO QDs NC对Cr(vi)的去除遵循准二级动力学模型，并且在存在其他共存离子的情况下，对Cr(vi)具有高度选择性。总之，PANI/Ag(AMPSA)/GO QDs NC作为一种新型的Cr(vi)吸附剂具有潜力。
