Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran.
Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran.
Int J Biol Macromol. 2018 Jan;106:101-115. doi: 10.1016/j.ijbiomac.2017.07.182. Epub 2017 Aug 1.
This article reports the efficient removal of malachite green (MG) dye from aqueous solution using a novel polysaccharide-based nanocomposite hydrogel adsorbent (NHA). The NHAs of different compositions were prepared through a simple free radical graft copolymerization of acrylamide (AM) monomer onto starch backbones in the presence of graphene oxide (GO) nano sheets and nono-hydroxyapatite (n-HAp). The surface morphology and chemical properties of the prepared NHAs were fully examined by using FTIR, SEM, TEM, XRD and TGA. The biocompatibility, biodegradability, porosity, water content and water uptake of the synthesized NHAs were also evaluated. The NHA was employed as bioadsorbents for the adsorption of MG dye. The temperature dependence data also revealed that MG sorption process was feasible, spontaneous and endothermic. The MG adsorption rates were described by the pseudo-second-order model. Furthermore, the adsorption isotherm data fitted well with the Langmuir isotherm model with a maximum adsorption capacity of 297mgg for MG dye. The NHA also showed an excellent regeneration capacity after five consecutive cycles of dye adsorption-desorption. According to the results, the prepared NHAs could be environment friendly and promising adsorbents for the adsorption of different cationic dyes from contaminated water.
本文报道了一种新型多糖基纳米复合水凝胶吸附剂（NHA），可有效去除水溶液中的孔雀石绿（MG）染料。通过在氧化石墨烯（GO）纳米片和纳米羟基磷灰石（n-HAp）存在下，丙烯酰胺（AM）单体在淀粉骨架上的简单自由基接枝共聚，制备了不同组成的 NHAs。通过 FTIR、SEM、TEM、XRD 和 TGA 充分研究了制备的 NHAs 的表面形态和化学性质。还评估了合成的 NHAs 的生物相容性、生物降解性、孔隙率、含水量和吸水率。将 NHA 用作生物吸附剂用于吸附 MG 染料。温度依赖数据还表明 MG 吸附过程是可行的、自发的和吸热的。MG 吸附速率由拟二级模型描述。此外，吸附等温线数据与 Langmuir 等温线模型拟合良好，MG 染料的最大吸附容量为 297mgg。NHA 在五次连续的染料吸附-解吸循环后也表现出优异的再生能力。根据结果，制备的 NHAs 可能是环境友好的、有前途的吸附剂，可用于从受污染的水中吸附不同的阳离子染料。
