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Abstract：
A three-dimensional porous bacterial cellulose/graphene oxide (BC/GO) composite hydrogel (BC/GO) was synthesized with multi-layer graphene oxide (GO) as the modifier and bacterial cellulose as the skeleton via an ultrasonic shaking process to absorb lead ions effectively. The characteristics of BC/GO were investigated through TEM, SEM, FT-IR, NMR and Zeta potential experiments. Compared to bacterial cellulose, the ultrasonic method and the carboxyl groups stemming from GO helped to enhance the availability of O(3)H of BC, in addition to the looser three-dimensional structure and enriched oxygen-containing groups, leading to a significantly higher adsorption capacity for Pb(II). In this paper, the adsorption behavior of BC/GO is influenced by the GO concentration, adsorption time, and initial concentration. The highest adsorption capacity for Pb(II) on BC/GO found in this study was 224.5 mg/g. The findings implied that the pseudo-second-order model explained the BC/GO adsorption dynamics and that the data of its adsorption isotherm fit the Freundlich model. Because of the looser three-dimensional structure, the complexation of carboxyl groups, and the enhanced availability of O(3)H, bacterial cellulose exhibited a much better adsorption capacity.
摘要：
以多层氧化石墨烯(GO)为改性剂,以细菌纤维素为骨架,通过超声振荡工艺合成了三维多孔细菌纤维素/氧化石墨烯(BC/GO)复合水凝胶(BC/GO),有效吸收铅离子。通过TEM研究了BC/GO的特性，SEM,FT-IR,NMR和Zeta电位实验。与细菌纤维素相比，超声波方法和来自GO的羧基有助于提高BC中O（3）H的可用性，除了更松散的三维结构和富集的含氧基团，导致对Pb（II）的吸附能力显着提高。在本文中,BC/GO的吸附行为受GO浓度的影响,吸附时间,和初始浓度。本研究中发现的BC/GO对Pb（II）的最高吸附容量为224.5mg/g。研究结果表明，伪二阶模型解释了BC/GO吸附动力学，其吸附等温线数据符合Freundlich模型。因为立体结构比较松散,羧基的络合，以及O(3)H的增强可用性，细菌纤维素表现出更好的吸附能力。
