Grupo de Físico-Química Orgânica, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, s/nº, Bauxita, Ouro Preto, Minas Gerais, 35400-000, Brazil.
Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, São Carlos, São Paulo, 13566-590, Brazil.
Environ Sci Pollut Res Int. 2022 Apr;29(18):26425-26448. doi: 10.1007/s11356-021-17549-5. Epub 2021 Dec 2.
A new one-pot synthesis method optimized by a 2 experimental design was developed to prepare a biosorbent, sugarcane bagasse cellulose succinate pyromellitate (SBSPy), for the removal of Cu(II) and Zn(II) from single-component aqueous solutions, in batch and continuous modes. The bi-functionalization of the biosorbent with ligands of different chemical structures increased its selectivity, improving its performance for removing pollutants from contaminated water. The succinate moiety favored Cu(II) adsorption, while the pyromellitate moiety favored Zn(II) adsorption. Sugarcane bagasse (SB) and SBSPy were characterized using several techniques. Analysis by C Multi-CP SS NMR and FTIR revealed the best order of addition of each anhydride that maximized the chemical modification of SB. The maximum adsorption capacities of SBSPy for Cu(II) and Zn(II), in batch mode, were 1.19 and 0.95 mmol g, respectively. Homogeneous surface diffusion, intraparticle diffusion, and Boyd models were used to determine the steps involved in the adsorption process. Isothermal titration calorimetry was used to assess changes in enthalpy of adsorption as a function of SBSPy surface coverage. Fixed-bed column adsorption of Cu(II) and Zn(II) was performed in three cycles, showing that SBSPy has potential to be used in water treatment. Breakthrough curves were well fitted by the Thomas and Bohart-Adams models.
一种新的一锅合成方法通过 2 实验设计进行了优化，用于制备一种生物吸附剂，即甘蔗渣纤维素琥珀酸均苯三甲酸酯（SBSPy），用于从单一组分水溶液中批量和连续模式去除 Cu(II)和 Zn(II)。生物吸附剂与不同化学结构的配体进行双功能化，增加了其选择性，提高了其从受污染水中去除污染物的性能。琥珀酸部分有利于 Cu(II)的吸附，而均苯三甲酸部分有利于 Zn(II)的吸附。使用多种技术对甘蔗渣 (SB) 和 SBSPy 进行了表征。C Multi-CP SS NMR 和 FTIR 分析表明，每种酐的最佳添加顺序最大限度地提高了 SB 的化学修饰程度。SBSPy 在批量模式下对 Cu(II)和 Zn(II)的最大吸附容量分别为 1.19 和 0.95 mmol g。均匀表面扩散、颗粒内扩散和 Boyd 模型用于确定吸附过程涉及的步骤。等温热滴定法用于评估吸附焓随 SBSPy 表面覆盖率的变化。在三个循环中进行了 Cu(II)和 Zn(II)的固定床柱吸附，表明 SBSPy 具有在水处理中应用的潜力。穿透曲线很好地符合 Thomas 和 Bohart-Adams 模型。
