Key Laboratory of Colloid and Interface Science of Education Ministry, Shandong University, Jinan, 250100, PR China.
Shandong Provincial Research Center for Water Pollution Control, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, PR China.
Sci Rep. 2018 Oct 18;8(1):15397. doi: 10.1038/s41598-018-33925-7.
By utilizing the synergistic effect of chitosan (CS), magnetite (FeO) particles, and graphene oxide (GO), a series of efficient and eco-friendly chitosan/magnetite-graphene oxide (CS/MGO) composites were fabricated through a facile chemical route. First, FeO particles were chemically deposited on the surface of GO to fabricate MGO hybrid. Then, chitosan was attached on MGO sheets, assembling to CS/MGO composites. According to the results of characterization, the covalent Fe-O-C bonds, electrostatic attraction, and hydrogen bonding between GO, FeO, and chitosan ensure excellent structural stability and physico-chemical properties. The adsorption of Cr(VI) onto CS/MGO composites was also carried out under various conditions (content of CS, pH, initial concentration, contact time, and temperature). The CS/MGO composites possess high removal capacity for Cr(VI) from aqueous solution. Moreover, results also suggested that the CS/MGO composites had a strong reducing action for Cr(VI). When adsorption occurred, Cr(VI) and Cr(III) were simultaneously removed by CS/MGO composites. In addition, CS/MGO composites could retain good Cr(VI) removal efficiency after reuse over five cycles. CS/MGO composites are expected to have potential applications as easily regenerative bioadsorbents for Cr(VI) polluted water cleanup.
通过利用壳聚糖（CS）、磁铁矿（FeO）颗粒和氧化石墨烯（GO）的协同效应，通过简便的化学途径制备了一系列高效且环保的壳聚糖/磁铁矿-氧化石墨烯（CS/MGO）复合材料。首先，通过化学沉积在 GO 表面上制备 FeO 颗粒以制备 MGO 杂化物。然后，壳聚糖附着在 MGO 片上，组装成 CS/MGO 复合材料。根据表征结果，GO、FeO 和壳聚糖之间的共价 Fe-O-C 键、静电吸引和氢键确保了优异的结构稳定性和物理化学性质。还在各种条件下（CS 的含量、pH 值、初始浓度、接触时间和温度）进行了 CS/MGO 复合材料对 Cr(VI)的吸附。CS/MGO 复合材料对水溶液中的 Cr(VI)具有高去除能力。此外，结果还表明 CS/MGO 复合材料对 Cr(VI)具有很强的还原作用。吸附发生时，CS/MGO 复合材料同时去除 Cr(VI)和 Cr(III)。此外，CS/MGO 复合材料在经过五次循环重复使用后仍能保持良好的 Cr(VI)去除效率。CS/MGO 复合材料有望作为可用于净化含 Cr(VI)废水的易于再生的生物吸附剂。
