Anhui Provincial Key Laboratory of Green Carbon Chemistry, Fuyang Normal University, Fuyang 236037, China; School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China.
School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China.
Int J Biol Macromol. 2024 Nov;279(Pt 3):135465. doi: 10.1016/j.ijbiomac.2024.135465. Epub 2024 Sep 7.
Efficient capture of dyes from wastewater is of great importance for environmental remediation. Yet constructing adsorbents with satisfactory adsorption efficiency and low cost remains a major challenge. This work reports a simple and scalable method for the fabrication of functionalized porous pullulan hydrogel adsorbent decorated with ATTM@ZIF-8 for the adsorption of congo red (CR) and malachite green (MG). The embedding of ammonium tetrathiomolybdate (ATTM) into the ZIF-8 nanoclusters offered additional adsorption sites and enlarged the pore size of the resulting ATTM@ZIF-8. The homogeneous dispersion of the nanoparticles in the three-dimensional network of polysaccharide gels prevents their agglomeration and thus improves the affinity for dye molecules. The resulting adsorbent AZP-20 at optimized composite ratios exhibits high activity, selectivity, interference resistance, reusability and cytocompatibility in dye adsorption applications, and possesses high removal rate of dye in real water systems. Batch experiments demonstrated that the adsorption rate of AZP-20 for MG and CR was 1645.28 mg g and 680.33 mg g, and would be influenced by pH conditions. Adsorption kinetics followed pseudo-second-order model. Adsorption isotherms followed Langmuir model for MG and Freundlich model for CR. The adsorption of dye molecules primarily relied on electrostatic interaction (MG) and π-π stacking interaction (CR). Conclusively, the prepared AZPs adsorbent illuminated good application prospects in the treatment of complex component dye wastewater.
高效捕获废水中的染料对于环境修复至关重要。然而，构建具有令人满意的吸附效率和低成本的吸附剂仍然是一个主要挑战。本工作报道了一种简单且可扩展的方法，用于制造功能化多孔普鲁兰水凝胶吸附剂，该吸附剂用 ATTM@ZIF-8 进行修饰，用于吸附刚果红（CR）和孔雀石绿（MG）。将四硫代钼酸铵（ATTM）嵌入 ZIF-8 纳米簇中提供了额外的吸附位点，并扩大了所得 ATTM@ZIF-8 的孔径。纳米颗粒在多糖凝胶的三维网络中的均匀分散防止了它们的聚集，从而提高了对染料分子的亲和力。在优化的复合材料比下，所得吸附剂 AZP-20 在染料吸附应用中表现出高活性、选择性、抗干扰性、可重复使用性和细胞相容性，并且在实际水系统中具有高的染料去除率。批量实验表明，AZP-20 对 MG 和 CR 的吸附速率分别为 1645.28 和 680.33 mg g，并且会受到 pH 条件的影响。吸附动力学符合拟二级模型。MG 的吸附等温线符合 Langmuir 模型，而 CR 的吸附等温线符合 Freundlich 模型。染料分子的吸附主要依赖于静电相互作用（MG）和π-π堆积相互作用（CR）。总之，所制备的 AZP 吸附剂在处理复杂成分染料废水方面具有良好的应用前景。
