Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan.
Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan.
Int J Biol Macromol. 2022 Dec 1;222(Pt A):750-758. doi: 10.1016/j.ijbiomac.2022.09.188. Epub 2022 Sep 24.
This study explores a biopolymer-based composite system for metal decontamination of water using copper {Cu (II)} as a model pollutant. Novel composite beads of chitosan and amidoxime grafted graphene oxide (AOGO) were successfully prepared and used for the Cu (II) removal from aqueous solutions. For this purpose, acrylonitrile was first polymerized onto a gamma-irradiated and silanized graphene oxide substrate. The nitrile groups of polyacrylonitrile grafted graphene oxide (GO-g-PAN) were then chemically modified into amidoxime groups to form AOGO nanohybrids. These nanohybrids were mixed with a blend of chitosan (CS) and polyvinyl alcohol (PVA) and crosslinked using tetraethylorthosilicate (TEOS) to form composite CP/AOGO beads. Fourier transform infrared spectroscopy (FTIR) was used to study the structural changes at each step during the formation of composite beads. Scanning electron microscopic (SEM) analysis demonstrated that the beads had a well-developed spherical structure. The adsorption of Cu (II) onto CP/AOGO composite beads was studied under different conditions (initial concentration, pH, and contact time). The results revealed the potential of composite beads in copper removal from aqueous solutions.
本研究探索了一种基于生物聚合物的复合材料系统，用于使用铜（Cu（II））作为模型污染物对水进行金属脱除。成功制备了壳聚糖和偕胺肟接枝氧化石墨烯（AOGO）的新型复合珠，并将其用于从水溶液中去除 Cu（II）。为此，首先在γ辐照和硅烷化氧化石墨烯基底上聚合丙烯腈。然后，将聚丙烯腈接枝氧化石墨烯（GO-g-PAN）中的腈基化学修饰成偕胺肟基团，形成 AOGO 纳米杂化物。这些纳米杂化物与壳聚糖（CS）和聚乙烯醇（PVA）的混合物混合，并使用四乙氧基硅烷（TEOS）交联，形成复合 CP/AOGO 珠。傅里叶变换红外光谱（FTIR）用于研究形成复合珠的每个步骤中的结构变化。扫描电子显微镜（SEM）分析表明，珠具有发达的球形结构。研究了 CP/AOGO 复合珠在不同条件（初始浓度、pH 值和接触时间）下对 Cu（II）的吸附。结果表明了复合珠在从水溶液中去除铜方面的潜力。
