Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
Carbohydr Polym. 2018 Jul 15;192:317-326. doi: 10.1016/j.carbpol.2018.03.048. Epub 2018 Mar 22.
Finding effective methodologies for the removal of heavy metals from contaminated water are really significant. Facile and "green" techniques for adsorbents fabrication are in high demand to satisfy a wide range of practical applications. This report presents of an efficient method for preparing FeO@ layered double hydroxide@ guargum bionanocomposites (GLF-BNCs). First of all, the LDH coated FeO nanoparticles were simply synthesized, using ultrasonic irradiation. The citrate coated FeO nanoparticles which were under negative charging and LDH nanocrystals which were charged positively make electrostatic interaction which formed a stable self-assembly component, and then guargum as a biopolymer were linked onto FeO@LDH via an in situ growth method. Furthermore, the GLF-BNCs had the ability to remove cadmium ions (Cd) from the aqueous solutions. Adsorption studies indicate that the Langmuir isotherm model and the kinetic model in pseudo-second order were appropriate for Cd(II) removal. The maximum Cd(II) adsorption capacity of the GLF8% was 258 mg g. The Cd(II) was adsorbed from aqueous solutions very quickly with the contact time of 5 min by the GLF 8%, suggesting that GLF-BNCs may be a promising adsorbent for removing Cd(II) from wastewater. The effect of FeO@LDH contents (2, 4 and 8 wt.%) on the thermal, physicomechanical, and morphological properties of guargum were investigated by Fourier transform infrared spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), field emission scanning electron microscopy, transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy and Brunauer-Emmett-Teller (BET) specific surface area techniques. The TEM results indicated that the LDH platelets are distributed within the polymer matrix.
从受污染的水中去除重金属的有效方法非常重要。为了满足各种实际应用的需求，人们迫切需要制备吸附剂的简单和“绿色”技术。本报告介绍了一种制备 FeO@层状双氢氧化物@瓜尔胶生物纳米复合材料（GLF-BNCs）的有效方法。首先，通过超声辐射简单合成了 LDH 包覆的 FeO 纳米粒子。带负电荷的柠檬酸包覆的 FeO 纳米粒子和带正电荷的 LDH 纳米晶之间通过静电相互作用形成稳定的自组装组分，然后瓜尔胶作为生物聚合物通过原位生长法连接到 FeO@LDH 上。此外，GLF-BNCs 具有从水溶液中去除镉离子（Cd）的能力。吸附研究表明，Langmuir 等温线模型和准二级动力学模型适用于 Cd(II)的去除。GLF8%的最大 Cd(II)吸附容量为 258mg g。GLF8%在 5min 的接触时间内，从水溶液中快速吸附 Cd(II)，表明 GLF-BNCs 可能是一种很有前途的吸附剂，可用于从废水中去除 Cd(II)。通过傅里叶变换红外光谱、X 射线衍射（XRD）、热重分析（TGA）、场发射扫描电子显微镜、透射电子显微镜（TEM）、能谱和 Brunauer-Emmett-Teller（BET）比表面积技术研究了 FeO@LDH 含量（2、4 和 8wt.%）对瓜尔胶热、物理机械和形态性能的影响。TEM 结果表明 LDH 片层分布在聚合物基体中。
