Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
Carbohydr Polym. 2020 May 15;236:116070. doi: 10.1016/j.carbpol.2020.116070. Epub 2020 Feb 26.
A novel bio-adsorbent based on guar gum (GG) was synthesized through the cross-linked polymerization of N,N'-methylene bis-acrylamide (MBA) onto FeO@ nickel aluminum layered double hydroxide (Ni/Al LDH) @ GG bionanocomposite (BNC) using an in situ growth method. The structural, thermal, and morphological properties of the MLG BNC were studied by different techniques. According to field emission scanning electron microscopy, and transmission electron microscopy, there is a uniform distribution of nanoparticles with a particle size of 40-50 nm in the nanocomposite. MLG BNC was used as Cr (VI) adsorbent, and the effect of pH, concentration, and contact time on adsorption capacity was determined. It was observed that the maximum Cr(VI) adsorption by MLG was 101 mg g (pH 6, 30 min). The adsorption isotherm was represented the single-layer, and homogeneous adsorption and the high value of R illustrates a good agreement with Langmuir. The adsorption kinetic was the second-order pseudo-model.
一种新型的基于瓜尔胶（GG）的生物吸附剂是通过在 FeO@镍铝层状双氢氧化物（Ni/Al LDH）@ GG 生物纳米复合材料（BNC）上通过原位生长法交联聚合 N,N'-亚甲基双丙烯酰胺（MBA）合成的。通过不同的技术研究了 MLG BNC 的结构、热和形态特性。根据场发射扫描电子显微镜和透射电子显微镜，纳米复合材料中存在粒径为 40-50nm 的均匀分布的纳米粒子。将 MLG BNC 用作 Cr（VI）吸附剂，确定了 pH、浓度和接触时间对吸附容量的影响。观察到 MLG 对 Cr（VI）的最大吸附量为 101mg/g（pH 6，30min）。吸附等温线表示单层均匀吸附，R 值较高表明与朗缪尔模型吻合较好。吸附动力学为二级拟动力学模型。
