table1_Preparation and Characterization of Sodium Alginate-Based Oxidized Multi-Walled Carbon Nanotubes Hydrogel Nanocomposite and its Adsorption Behaviour for Methylene Blue Dye.docx

Herein, a sodium alginate/poly (acrylic acid)/oxidized-multi-walled carbon nanotubes hydrogel nanocomposite (SA/p(AAc)/o-MWCNTs HNC) was synthesized by in situ free-radical polymerization method. The synthesized SA/p(AAc)/o-MWCNTs HNC was used to remove methylene blue (MB) from aqueous solution. The synthesized HNC was confirmed by employing various characterization techniques. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum swelling capacity of 2265.4% at pH 8.0. The influence of vital parameters in the sorption process including the initial pH, adsorption dose, contact time and concentration were systematically examined on a batch mode. Subsequently, adsorption kinetics as well as isotherm models were applied to assess the nature and mechanism of the adsorption process. Adsorption kinetics were best described by pseudo-second-order model, while the Langmuir isotherm model governed the adsorption isotherm. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum adsorption capacity of 1596.0 mg/g at 25°C. This adsorbent showed excellent MB uptake and good regeneration ability.

本研究通过原位自由基聚合法合成了海藻酸钠/聚丙烯酸/氧化多壁碳纳米管水凝胶纳米复合材料（SA/p(AAc)/o-MWCNTs HNC）。所合成的该纳米复合材料被用于去除水溶液中的亚甲基蓝（MB），并通过多种表征手段完成了结构与性能确认。该SA/p(AAc)/o-MWCNTs HNC在pH 8.0条件下的最大溶胀率可达2265.4%。通过批量吸附实验，系统考察了吸附过程中的关键参数对吸附效果的影响，包括初始pH值、吸附剂投加量、接触时间以及亚甲基蓝初始浓度。随后采用吸附动力学模型与吸附等温模型对该吸附过程的本质与作用机制进行解析，结果显示吸附动力学过程最符合准二级动力学模型，而吸附等温行为则由朗缪尔等温吸附模型主导。该SA/p(AAc)/o-MWCNTs HNC在25℃下的最大吸附容量为1596.0 mg/g，该吸附剂不仅对亚甲基蓝展现出优异的吸附性能，同时具备良好的再生能力。