Cellulose ( IF 4.9 ) Pub Date : 2021-09-28 , DOI: 10.1007/s10570-021-04207-9 Xue Shao 1 , Xiaoping Chen 1 , Zhiwei Qiu 1 , Guanglei Yao 1 , Fengxian Qiu 1 , Tao Zhang 1, 2
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Abstract
Considerable toxic tellurium-containing wastewater has been discharged into water environment and constantly accumulates, due to the widespread applications but low utilization of tellurium, causing irreversible harm to the environment and human health, thus it is crucial to find an efficient strategy for tellurium separation. Herein, hierarchical porous magnesium oxide modified cellulose acetate membranes (MgO@CAM) were prepared via a facile physical blending and phase inversion method for tellurium separation. Diverse characterization methods and batch separation experiments were conducted to investigate the morphological structure of MgO@CAM, tellurium separation mechanism, and the separation behavior under different influencing factors. The results exhibit that MgO@CAM has a hierarchical porous structure and a hydroxyl-rich surface, which facilitates the separation of tellurium. Besides, MgO@CAM reveals eligible regeneration performance, good stability and thermal stability due to the hydrogen bonding and skeletal structure of cellulose acetate. The study on the effect of pH suggests that an acidic environment is more conducive to the separation of tellurium by MgO@CAM, and the prepared membranes show outstanding separation efficiency of tellurium, with a maximum of 97.6%. Furthermore, the membranes also achieve satisfactory separation efficiency of tellurium in the presence of multiple coexisting ions. Thomas dynamics indicate the practical application of MgO@CAM in tellurium separation. More importantly, prominent hydrophilic enables MgO@CAM to demonstrate excellent antifouling performance. Therefore, the preparation of hierarchical porous MgO@CAM provides an efficient and economic strategy for tellurium separation in wastewater and has promising applications in water treatment.
Graphic abstract
中文翻译：
制备具有改进防污性能的分级多孔 MgO/醋酸纤维素杂化膜用于碲分离
摘要
由于碲应用广泛但利用率低，大量有毒含碲废水排放到水环境中并不断累积，对环境和人类健康造成不可逆转的危害，因此寻找有效的碲分离策略至关重要。在此，通过简便的物理共混和相转化方法制备了分级多孔氧化镁改性醋酸纤维素膜（MgO@CAM），用于碲分离。通过多种表征方法和批量分离实验，研究了MgO@CAM的形态结构、碲分离机制以及不同影响因素下的分离行为。结果表明，MgO@CAM 具有分级多孔结构和富含羟基的表面，这有利于碲的分离。此外，由于醋酸纤维素的氢键和骨架结构，MgO@CAM 显示出合格的再生性能、良好的稳定性和热稳定性。pH影响的研究表明，酸性环境更有利于MgO@CAM对碲的分离，制备的膜表现出优异的碲分离效率，最高可达97.6%。此外，该膜在多种共存离子的存在下也实现了令人满意的碲分离效率。Thomas 动力学表明 MgO@CAM 在碲分离中的实际应用。更重要的是，突出的亲水性使 MgO@CAM 表现出优异的防污性能。所以，
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