Open AccessKINETIKA ADSORPSI ION EMAS(III) OLEH HIBRIDA MERKAPTO SILIKA
Author(s) -
Saprini Hamdiani,
Nuryono Nuryono,
Bambang Rusdiarso
Publication year - 2015
Publication title -
jurnal pijar mipa/jurnal pijar mipa (pengkajian ilmu dan pengajaran matematika dan ilmu pengetahuan alam)
Language(s) - English
Resource type - Journals
eISSN - 2460-1500
pISSN - 1907-1744
DOI - 10.29303/jpm.v10i1.11
Subject(s) - chemistry , adsorption , kinetics , ion , nuclear chemistry , organic chemistry , physics , quantum mechanics
Abstrak: Telah dilakukan kajian kinetika adsorpsi ion emas(III) oleh adsorben hibrida merkapto silika (HMS). HMS disintesis melalui proses sol-gel dengan prekursor natrium silikat (Na2SiO3) dari abu sekam padi. HMS dibuat dengan menambahkan asam klorida pada campuran senyawa 3-(trimetoksilil)-1-propantiol (TMSP) dan larutan Na2SiO3. Kinetika adsorpsi ditentukan dengan melakukan adsorpsi sistem statik (batch) dengan variasi waktu. Jumlah ion emas yang teradsorpsi dihitung secara kuantitatif berdasarkan selisih konsentrasi logam sebelum dan setelah adsorpsi yang dianalisis dengan spektroskopi serapan atom (SSA). Data menunjukkan interaksi HMS dengan ion emas cenderung mengikuti pola kinetika reaksi pseudo orde-2 dengan nilai konstanta laju reaksi (k) = 1x10-2 g mg-1min-1. Berdasarkan nilai perubahan energi bebas Gibbs adsorpsi standar (-̉G̡= 34,63-37,99 kJ/mol) menunjukkan bahwa adsorpsi berlangsung secara kimia (kemisorpsi).Kata kunci: kinetika, emas, merkapto, silika, abu sekam padi, pseudo orde-2.Abstract: Adsorption kinetics study has been done of gold(III) ions by mercapto silica hybrid (MSH) adsorben. MSH was synthesized by sol-gel process with sodium silicate (Na2SiO3) from rice husk ash as a precursor. MSH made by adding hydrochloric acid to 3-(trimetoksilil)-1-propantiol (TMSP) compounds and Na2SiO3 solution. Adsorption kinetics are determined by adsorption static system (batch) with variation of time. The amount of the adsorbed gold ions is quantified by the difference in metal concentration before and after adsorption analyzed by atomic absorption spectroscopy (AAS). The data showed, MSH interaction with gold ion tends to follow the pattern of reaction kinetics pseudo-second-order with rate constant (k) =1x10-2 g mg-1min-1. Based on the value of the standard Gibbs free energy for adsorption (-̉G̡= 34,63-37,99 kJ/mol) showed that the adsorption takes place chemically (chemisorption).Keywords: kinetics, gold, mercapto, silica, rice husk ash, pseudo-second-order.