Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126688. doi: 10.1016/j.ijbiomac.2023.126688. Epub 2023 Sep 4.
Adsorption method is an effective approach to treat wastewater containing methylene blue. Herein, a cost-effective and eco-friendly lignin-based network composite hydrogel adsorbent (PAA@SML) was constructed by using polyacrylic acid (PAA) to crosslink with sulfomethylated lignin (SML) via free radical polymerization for adsorption of methylene blue (MB) from wastewater. The constructed PAA@SML-0.2 exhibited remarkable adsorption performance towards removal of MB, with a maximum theoretical adsorption capacity of 777.1 mg·g. The improved efficiency can be attributed to the well-established network structure and abundant hydrophilic functional groups present in the adsorbent, promoting the interaction between methylene blue (MB) molecules and the adsorption sites of the adsorbent. The adsorption process of the adsorbent for MB followed the pseudo-second-order kinetic and the Langmuir isotherm models, which illustrated the adsorption process attributed to monolayer chemisorption. Mechanism investigation confirmed that the adsorption of MB by PAA@SML-0.2 primarily relied on hydrogen bonding and electrostatic interactions. Moreover, the recyclability test demonstrated excellent regeneration usability and stability of PAA@SML-0.2, and the adsorption capacity maintained above 74.0 % after five cycles. This constructed lignin-based network composite hydrogel is considered to have great potential in the treatment of organic dye in wastewater.
吸附法是处理含亚甲基蓝废水的有效方法。本文通过自由基聚合，利用聚丙烯酸（PAA）交联磺甲基化木质素（SML），构建了一种具有成本效益和环境友好性的基于木质素的网络复合水凝胶吸附剂（PAA@SML），用于从废水中吸附亚甲基蓝（MB）。构建的 PAA@SML-0.2 对 MB 的去除表现出显著的吸附性能，最大理论吸附容量为 777.1 mg·g。效率的提高归因于吸附剂中存在的良好建立的网络结构和丰富的亲水性官能团，促进了亚甲基蓝（MB）分子与吸附剂吸附位点之间的相互作用。吸附剂对 MB 的吸附过程符合准二级动力学和朗缪尔等温线模型，表明吸附过程归因于单层化学吸附。机理研究证实，PAA@SML-0.2 对 MB 的吸附主要依赖于氢键和静电相互作用。此外，循环使用测试表明 PAA@SML-0.2 具有优异的再生可用性和稳定性，经过五次循环后，吸附容量保持在 74.0%以上。这种构建的基于木质素的网络复合水凝胶被认为在处理废水中的有机染料方面具有巨大的潜力。
