TEKNIK IMPRINTING SOL GEL DAN GRAFTING DALAM PEMBUATAN HIBRIDA AMINO SILIKA UNTUK ADSORPSI SELEKTIF LOGAM TRANSISI

WISNU ARFIAN ANDITYA SUDJARWO, Prof. Dr. Narsito

2011 | Tesis | S2 Ilmu Kimia

Telah dipelajari sifat adsorpsi dari adsorben hibrida amino-silika (HAS) imprinted Cu dan Cr menggunakan senyawa 3-aminopropiltrimetoksisilan (APTMS) dengan prekursor utama tetra etil orthosilikat (TEOS) melalui proses sol gel dan grafting pada permukaan silika. Karakterisasi material imprinted ionik dilakukan dengan identifikasi gugus fungsional dan analisis permukaan (luas permukaan spesifik). Sifat adsorpsi yang dipelajari dari adsorben HAS imprinted ionik meliputi penentuan keadaan optimum adsorpsi, kapasitas dan energi adsorpsi serta karakter adsorpsi multilogam untuk masing-masing adsorben yang dibandingkan dengan silika gel non-imprinted (SGNI). Sintesis HAS imprinted ionik dilakukan secara sol gel dengan prekursor TEOS melalui proses simultan dan juga secara grafting pada permukaan silika dengan prekursor silika gel melalui proses refluks, masing-masing dengan logam yang menjadi target adsorpsi, yaitu Cu(II) dan Cr(III). Hasil penelitian menunjukkan bahwa adsorpsi ion Cu(II) terjadi optimum di setiap adsorben pada pH 4,5 sedangkan ion Cr(III) pada pH 5,5. Kapasitas adsorpsi Cu(II) terbesar dicapai oleh i-Cu sol gel dengan nilai 41,42 mg/g sedangkan pada larutan Cr(III), kapasitas terbesar ditemukan pada i-Cr grafting sebesar 49,76 mg/g. Data pengujian selektivitas adsorpsi multilogam menunjukkan bahwa HAS imprinted ionik lebih selektif dibandingkan SGNI dan selektivitas adsorpsi relatif HAS imprinted grafting lebih besar dibanding HAS imprinted sol gel.

The adsorption properties of ions imprinted Cu and Cr of amino-silica hybrid (HAS) adsorbents used 3-aminopropyltrimethoxysilane (APTMS) with tetraethylorthosilicate (TEOS) as main precursor via sol gel process and grafting on silica surface have been studied. Characterizations of ionic imprinted material were done by identification of functional group and analysis of the silica surface (specific surface area). The studied adsorption properties of ionic imprinted HAS adsorbent involved determination of the optimum condition of adsorption, adsorption capacity and adsorption energy and also character of multimetals adsorption for each adsorbent that were compared with non-imprinted silica gel (SGNI). Synthesis of ionic imprinted HAS was done with the sol gel precursor TEOS through a simultaneous process and grafting on silica surface with silica gel as precursor through a reflux process, each with the adsorbed metal targeted i.e. Cu(II) and Cr(III). Results showed that the optimum condition of adsorption of Cu(II) and Cr(III) in each adsorbent occurred at pH 4.5 and 5.5, respectively. The largest adsorption capacity of Cu(II) with the amount of 41.42 mg/g was achieved by i-Cu sol gel while the largest adsorption capacity of Cr(III) with the amount of 49.76 mg/g was achieved by i-Cr grafting. The selectivity-test data of multimetals adsorption showed that the selectivity of HAS imprinted ionic was higher than SGNI and the relative adsorption selectivity of HAS imprinted grafting was higher than HAS imprinted sol gel.

Kata Kunci : APTMS, adsorpsi, imprinted, selektivitas