Grupo de Físico-Química Orgânica, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, Minas Gerais, Brazil.
Departamento de Física e Ciência Interdisciplinar, Instituto de Física de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, 13566-590 São Carlos, São Paulo, Brazil.
J Colloid Interface Sci. 2019 Jan 1;533:678-691. doi: 10.1016/j.jcis.2018.08.109. Epub 2018 Aug 30.
Sugarcane bagasse cellulose mixed ester succinate phthalate (SBSPh) was synthesized by a novel one-pot reaction method. The effects of temperature, time and mole fraction of succinic anhydride (χ) on the responses weight gain (wg), number of carboxylic acid groups (n), and adsorption capacity (q) of Co and Ni were evaluated by a 2 experimental design. The chemical structure of the material was elucidated by Fourier transform infrared, C Multiple Cross-Polarization solid-state NMR spectroscopy and H NMR relaxometry. The best SBSPh synthesis condition (100 °C, 11 h, χ of 0.2) yielded a wg of 59.1%, n of 3.41 mmol g, and values of q and q of 0.348 and 0.346 mmol g, respectively. The Sips model fitted better the equilibrium data, and the maximum adsorption capacities (pH 5.75 and 25 °C) estimated by this model were 0.62 and 0.53 mmol g for Co and Ni, respectively. The ΔH° values estimated by isothermal titration calorimetry were 8.43 and 7.79 kJ mol for Co and Ni, respectively. Desorption and re-adsorption efficiencies were evaluated by a 2 experimental design, which showed that SBSPh adsorbent can be recovered and reused without significant loss of adsorption capacity.
甘蔗渣纤维素混合酯琥珀酸丁二酸（SBSPh）通过一种新颖的一锅法反应合成。通过 2 因素实验设计评估了温度、时间和琥珀酸酐摩尔分数（χ）对增重（wg）、羧酸基团数（n）和 Co、Ni 吸附量（q）的影响。采用傅里叶变换红外、C 多重交叉极化固态 NMR 光谱和 H NMR 弛豫率对材料的化学结构进行了阐明。最佳 SBSPh 合成条件（100°C，11 h，χ为 0.2）得到了 59.1%的 wg、3.41 mmol g 的 n 和 0.348、0.346 mmol g 的 q 和 q 值。Sips 模型更适合平衡数据，通过该模型估计的最大吸附容量（pH 5.75 和 25°C）分别为 Co 和 Ni 的 0.62 和 0.53 mmol g。等温滴定热法估算的ΔH°值分别为 Co 和 Ni 的 8.43 和 7.79 kJ mol。通过 2 因素实验设计评估了洗脱和再吸附效率，结果表明 SBSPh 吸附剂可以回收和重复使用，而不会显著损失吸附能力。
