Chemistry & Environment Science College, Inner Mongolia Normal University, China; Inner Mongolia Key Laboratory of Environmental Chemistry, Hohhot 010022, China.
Chemistry & Environment Science College, Inner Mongolia Normal University, China; Inner Mongolia Key Laboratory of Environmental Chemistry, Hohhot 010022, China.
Int J Biol Macromol. 2024 Jun;272(Pt 1):132925. doi: 10.1016/j.ijbiomac.2024.132925. Epub 2024 Jun 4.
An eco-friendly macroparticle biochar (BC)-based Ce(III)-La(III) crosslinked sodium alginate (SA) hybrid hydrogel (BC/Ce-SA-La) was synthesized by droplet polymerization and characterized by SEM-EDS, XRD, FTIR, UV-Vis and XPS. The effects of dosage, pH, contact time, temperature and coexisting ions on the F ions removal by hybrid hydrogel, and the adsorption performance, interaction mechanism and reusability were investigated. The results demonstrate that the composite has a fancy wrinkle structure with a particle size of about 1.8 mm and abundant porosity on the surface. The removal rate of F ions by BC/Ce-SA-La reached 90.2 % under the conditions of pH 2.0, 200 min of contact time and 298 K. The adsorption behavior was perfectly explained by Langmuir model, and the maximum adsorption capacity reached 129 mg/g. The adsorption process was an endothermic spontaneous reaction and followed Pseudo-second-order rate model. The strong adsorption was attributed to multi-interactions including complexation, hydrogen bonding and electrostatic adsorption between the composite and F ions. Coexisting ions hardly interfered with the adsorption of F ions by BC/Ce-SA-La except for a slight effect of phosphate. The composite after F ion adsorption was easily separated and could be reused at least three times. BC/Ce-SA-La is a cost-effective and promising granular biosorbent.
一种环保的介孔生物炭（BC）基铈（III）-镧（III）交联海藻酸钠（SA）杂化水凝胶（BC/Ce-SA-La）通过液滴聚合合成，并通过 SEM-EDS、XRD、FTIR、UV-Vis 和 XPS 进行了表征。考察了剂量、pH 值、接触时间、温度和共存离子对杂化水凝胶去除 F 离子的影响，以及吸附性能、相互作用机制和可重复使用性。结果表明，该复合材料具有奇特的褶皱结构，表面颗粒尺寸约为 1.8mm，且具有丰富的孔隙度。在 pH 值为 2.0、接触时间为 200min 和 298K 的条件下，BC/Ce-SA-La 对 F 离子的去除率达到 90.2%。吸附行为被完美地解释为 Langmuir 模型，最大吸附容量达到 129mg/g。吸附过程是一个吸热自发反应，符合准二级速率模型。这种强吸附归因于复合材料与 F 离子之间的多种相互作用，包括络合、氢键和静电吸附。除了磷酸盐的轻微影响外，共存离子几乎不会干扰 BC/Ce-SA-La 对 F 离子的吸附。吸附 F 离子后的复合材料易于分离，至少可重复使用三次。BC/Ce-SA-La 是一种具有成本效益和前景的颗粒状生物吸附剂。
