APPLICATION OF AMINO-FUNCTIONALIZED MESOPOROUS SILICA COATED QUARTZ SAND FOR REMOVAL OF IRON AND MANGANESE IONS FROM COAL MINE DRAINAGE

摘要

Iron removal; Manganese removal; Coated quartz sand; Mesoporous silica; Coal mine drainage%By combining quartz sand with synthesized gel of amino-functionalized mesoporous silica (AFMS) during the solvent evaporation, the amino-functionalized mesoporous silica coated quartz sand (AFMSCQS) was prepared and successfully used to remove iron and manganese ions from coal mine drainage (CMD). The surface morphology of AFMSCQS was recorded with SEM images and the average coating yield of AFMS reached 15.48%. Subsequently, simulated drainage contained Fe~(2+) or Mn~(2+) was prepared to compare removal abilities of three adsorbents by breakthrough curves, which weakened in the order AFMSCQS > AFMS > uncoated quartz sand. Adsorption capacities at breakthrough point of iron and managnese onto active ingredient of AFMSCQS were 45.14 mg/g and 19.53 mg/g, respectively. The regeneration abilities of AFMS and AFMSCQS were also contrasted and the later was recovered well for extremely low loss rate even after 5 cycles. In addition, the removal performance of AFMSCQS for iron and manganese from an actual CMD sample was investigated via the adsorption column test. On the basis of observed experimental data, it can safely be concluded that AFMSCQS could be a potential adsorbent for the removal of iron and manganese from CMD.