Minerals Engineering ( IF 4.8 ) Pub Date : 2022-08-08 , DOI: 10.1016/j.mineng.2022.107777 Fatih Kaya, Ahmet Özer
Chitosan is a natural polymer that is renewable, biocompatible, and biodegradable. Bentonite is a natural mineral with low environmental effects. For this reason, chitosan- bentonite biocomposite film was synthesized as a sorbent and its characterized by FT-IR, SEM, EDX, CHNS elemental analysis and thermal analysis techniques. The sorbent was utilized for selective sulfate (SO42−) sorption from boric acid factory process liquor, because one of the most important problems in the boric acid production process is sulfate impurity. The sulfate sorption capacity in the acidic region (pH < 5) was determined as 308.38 mg/g and the equilibrium time was determined as 10 min. It has also been found that the sorbent is regenerative and reusable. Sulfate sorption took place by means of primary amine (-NH2) groups in the structure of the biocomposite. In addition, it was considered that the synthesized sorbent acts as a weakly basic anion exchanger resin. It was determined that the total sulfate salt concentration in the process liquor medium decreased by approximately 30.36% depending on the sulfate sorption. In this context, it is considered that the boric acid factory process liquor has been successfully purified.
中文翻译:
硼酸厂工艺液中硫酸盐的选择性吸附:作为吸附剂的壳聚糖-膨润土生物复合膜合成
壳聚糖是一种可再生、生物相容和可生物降解的天然聚合物。膨润土是一种对环境影响较小的天然矿物。为此,合成了壳聚糖-膨润土生物复合膜作为吸附剂,并通过FT-IR、SEM、EDX、CHNS元素分析和热分析技术对其进行了表征。由于硼酸生产过程中最重要的问题之一是硫酸盐杂质,该吸附剂用于选择性吸附硼酸工厂工艺液中的硫酸盐 (SO 4 2- )。酸性区域(pH < 5)的硫酸盐吸附容量确定为 308.38 mg/g,平衡时间确定为 10 分钟。还发现吸附剂是可再生和可重复使用的。硫酸盐吸附通过伯胺(-NH2 )生物复合材料结构中的基团。此外,合成的吸附剂被认为是弱碱性阴离子交换树脂。已确定工艺液体介质中的总硫酸盐浓度降低了大约 30.36%,具体取决于硫酸盐吸附。在此背景下,认为硼酸厂工艺液已成功净化。