氧化石墨对活性红X-3B的吸附特性及再生性能

基于改进Hummers法制备了氧化石墨,研究其对活性红X-3B的吸附及再生性能,采用红外光谱对吸附前后的氧化石墨结构进行表征,探究了其对活性红X-3B的吸附机理。结果表明,氧化石墨含有C-OH、-COOH和C-O-C等官能团,相比石墨而言,含氧官能团数量的增加改善了亲水性和吸附性能;在酸性条件下氧化石墨对活性红X-3B的吸附效果较好,吸附容量达到78.37 mg/g。氧化石墨对活性红X-3B的吸附符合准2级动力学反应模型,吸附等温线符合Langmuir吸附等温方程,以单分子层吸附为主,化学吸附是主要控速步骤。氧化石墨经过5次吸附饱和-再生循环使用,仍有较好的吸附效果,再生率可达89%。

Adsorption Characteristics of Reactive Red X-3B by Graphite Oxide and Its Regeneration

The graphite oxide was prepared via modified Hummers method, the adsorption of active red X-3B on the graphite oxide and its regeneration property were studied. The structural of graphite oxide before and after adsorption were characterized by FTIR and the adsorption mechanism of active red X-3B on graphite oxide was explored. The results indicated that the graphite oxide contained various oxygen-containing functional groups such as C-OH,-COOH and C-O-C, which increased the hydrophilicity and the adsorption properties of products. The adsorption effect of graphite oxide on active red X-3B under acidic conditions was better than others, the adsorption capacity reached 78.37 mg/g. The adsorption kinetics of graphite oxide followed pseudo-second-order kinetic model, the adsorption isotherms was described by Langmuir equation and the which was monomolecular layer adsorption and the chemical adsorption was the major rate limiting step. After 5 times adsorption/regeneration, the graphite oxide still had well adsorption ability and the regeneration efficiency reached 89%.