Jiao Chenlu, Liu Die, Wei Nana, Gao Jiannan, Fu Fan, Liu Tao, Wang Jian
College of Light-Textile Engineering and Art, Anhui Agricultural University, Hefei 230036, China.
Polymers (Basel). 2021 Nov 10;13(22):3890. doi: 10.3390/polym13223890.
Porous sustainable cellulose/gelatin/sepiolite gel beads were fabricated via an efficient 'hydrophilic assembly-floating droplet' two-step method to remove Congo red (CR) from wastewater. The beads comprised microcrystalline cellulose and gelatin, forming a dual network framework, and sepiolite, which acted as a functional component to reinforce the network. The as-prepared gel beads were characterized using FTIR, SEM, XRD, and TGA, with the results indicating a highly porous structure that was also thermally stable. A batch adsorption experiment for CR was performed and evaluated as a function of pH, sepiolite addition, contact time, temperature, and initial concentration. The kinetics and isotherm data obtained were in agreement with the pseudo-second-order kinetic model and the Langmuir isotherm, with a maximum monolayer capacity of 279.3 mg·g for CR at 303 K. Moreover, thermodynamic analysis demonstrated the spontaneous and endothermic nature of the dye uptake. Importantly, even when subjected to five regeneration cycles, the gel beads retained 87% of their original adsorption value, suggesting their suitability as an efficient and reusable material for dye wastewater treatments.
通过高效的“亲水组装-漂浮液滴”两步法制备了多孔可持续纤维素/明胶/海泡石凝胶珠，用于去除废水中的刚果红（CR）。这些珠子由微晶纤维素和明胶组成，形成双网络框架，海泡石作为功能成分增强网络。使用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、X射线衍射（XRD）和热重分析（TGA）对制备的凝胶珠进行了表征，结果表明其具有高度多孔的结构且热稳定性良好。进行了CR的批量吸附实验，并根据pH值、海泡石添加量、接触时间、温度和初始浓度对其进行了评估。获得的动力学和等温线数据与伪二级动力学模型和朗缪尔等温线一致，在303K时CR的最大单层吸附容量为279.3mg·g。此外，热力学分析表明染料吸附具有自发性和吸热性。重要的是，即使经过五个再生循环，凝胶珠仍保留其原始吸附值的87%，表明它们适合作为一种高效且可重复使用的材料用于染料废水处理。
