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Graphene oxide-terminated hyperbranched amino polymer-carboxymethyl cellulose ternary nanocomposite for efficient removal of heavy metals from aqueous solutions
International Journal of Biological Macromolecules ( IF 7.7 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.ijbiomac.2020.01.185
Qiaoping Kong , Sergei Preis , Leli Li , Pei Luo , Yun Hu , Chaohai Wei

A high-efficiency graphene oxide-terminated hyperbranched amino polymer-carboxymethyl cellulose ternary nanocomposite (GO-HBP-NH2-CMC) was fabricated for adsorbing heavy metals from aqueous solutions. The adsorbent was characterized by SEM, FT-IR, Raman, and XPS analyses showing its porous architecture, rough surface, abundant N- and O-containing functional groups providing enhanced binding ability towards Pb2+ and Cu2+. Experimental adsorption data fitted well to the pseudo-second-order kinetics and Langmuir isotherm models, indicating the adsorption of GO-HBP-NH2-CMC towards Pb2+ and Cu2+ being a chemical and monolayer process. The maximum adsorption capacities of GO-HBP-NH2-CMC for Pb2+ and Cu2+ at 25 °C comprised 152.86 and 137.48 mg/g, respectively. The laboratory-scale experimental study into the Pb2+ and Cu2+ adsorption in a fixed-bed column was undertaken. Effects of flow rate, bed depth and influent metals concentration on the adsorption performance were assessed. Experimental data successfully correlated with the Adams-Bohart, Thomas and Yoon-Nelson models with the R2 exceeding 0.79. Density functional theory calculation was adopted to study interactions between functional groups at GO-HBP-NH2-CMC and heavy metals showing OH, NH2 and COOH moieties in GO-HBP-NH2-CMC being more likely to bind Pb2+ rather than Cu2+, while the binding abilities of -CONH- towards Pb2+ and Cu2+ were similar.



中文翻译:

氧化石墨烯封端的超支化氨基聚合物-羧甲基纤维素三元纳米复合材料,用于从水溶液中有效去除重金属

制备了一种高效氧化石墨烯封端的超支化氨基聚合物-羧甲基纤维素三元纳米复合材料(GO-HBP-NH 2 -CMC),用于从水溶液中吸附重金属。通过SEM,FT-IR,拉曼和XPS分析对吸附剂进行了表征,表明吸附剂具有多孔结构,粗糙的表面,丰富的N和O官能团,从而增强了与Pb 2+和Cu 2+的结合能力。实验吸附数据很好地拟合了拟二级动力学和Langmuir等温模型,表明GO-HBP-NH 2 -CMC对Pb 2+和Cu 2+的吸附是化学和单层过程。GO-HBP-NH的最大吸附量25°C下Pb 2+和Cu 2+的2 -CMC分别为152.86和137.48 mg / g。对固定床色谱柱中的Pb 2+和Cu 2+吸附进行了实验室规模的实验研究。评估了流速,床深度和进水金属浓度对吸附性能的影响。实验数据与R 2超过0.79的Adams-Bohart,Thomas和Yoon-Nelson模型成功关联。采用密度泛函理论计算研究GO-HBP-NH 2 -CMC上的官能团与GO-HBP-NH中显示OH,NH 2COOH部分的重金属之间的相互作用2 -CMC更可能结合Pb 2+而不是Cu 2+,而-CONH-对Pb 2+和Cu 2+的结合能力相似。

更新日期:2020-01-26
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