Saral Dwi Miftiyati, S. Hamdiani, M. G. Darmayanti
A study has been conducted on the synthesis of paramagnetic mercapto silica hybrids as metal adsorbent of Ag(I). The aim of this study was to synthesis paramagnetic mercapto silica hybrid from rice husk ash waste, knowing the characteristics of paramagnetic mercapto silica hybrid from rice husk ash waste, and to determine the effect of pH, metal ions concentration, and the contact time on the value of adsorption capacity (Q). Based on the results of the study, it was found that paramagnetic mercapto silica hybrids can be synthesized from the rice husk ash waste. Characterization using FTIR spectroscopy showed that silanol (Si-OH), siloxan (Si-O-Si), -SH, and Fe-OH functional groups, and characterization of paramagnetic mercapto silica hybrid structures using XRD to show crystalline compounds with a position value of 2θ = 35.4 which showed that the magnetite material of Fe3O4 was coated by silica. Paramagnetic mercapto silica hybrids from rice husk waste can be used as adsorbent of Ag (I) metal at optimum conditions of pH 3, contact time of 120 minutes, and adsorption capacity of 392.01 mg/g. The suitable isotherm model is the Freundlich isotherm model which means the absorption of metal Ag (I) occurs physically, while adsorption of kinetics followed the pseudo II order kinetic model with a value of k = 3.01 g.mg-1 minute-1.
研究了顺磁性硫醇硅杂化物作为银(I)金属吸附剂的合成。本研究的目的是利用稻壳灰渣合成顺磁性硫醇-二氧化硅杂交种，了解稻壳灰渣顺磁性硫醇-二氧化硅杂交种的特性，并确定pH、金属离子浓度、接触时间对吸附量Q值的影响。根据研究结果，发现稻壳灰渣可以合成顺磁性硫醇-二氧化硅杂交种。FTIR表征发现硅醇(Si-OH)、硅氧烷(Si-O-Si)、-SH和Fe-OH官能团;顺磁巯基-二氧化硅杂化结构的XRD表征发现结晶化合物的位置值为2Î约35.4，表明Fe3O4磁铁矿材料被二氧化硅包覆。稻壳渣顺磁性巯基硅杂合体可作为银(I)金属的吸附剂，最佳吸附条件为pH为3，接触时间为120 min，吸附量为392.01 mg/g。合适的等温线模型为Freundlich等温线模型，即金属Ag (I)的吸附是物理发生的，而吸附动力学遵循伪II级动力学模型，其k = 3.01 g.mg-1 min -1。
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