Peculiarities of functionalization of mesostructured silicates MCM-41 and SBA-15 by a sulfide modifier

The synthesis and physical-chemical characteristics of sorbents based on mesoporous silicates MCM-41 and SBA-15 with grafted sulfide functional groups are described. Similar experiments were performed on silica gels for the comparison. For the above materials, the X-ray and texture characteristics before and after functionalization, as well as the grafted groups content and the sorption parameters of sorbents, have been determined using physical-chemical methods. The effect of the different conditions of the modification process on the grafting density of sulfide groups has been investigated. The evaluation of the sorption capacity of the obtained materials with respect to Pd(II) ions has been performed: the capacity is around 0.55 mmol/g, the recovery degree is 98–99% and the distribution coefficient is 26000 cm3/g.