Pemanfaatan Silika dari Abu Sekam Padi untuk Pembuatan Material Imprinted Ionic sebagai Adsorben Ion Logam Pb(II)

Sri Hastuti, Tri Martini, Agustina Tri Utami

Abstract

Sintesis material imprinted ionic Pb(II) (SiO2-TMPDT-Pb-Imp) menggunakan natrium silikat dari abu sekam padi (Na­2SiO3(ASP)) telah berhasil dilakukan pada penelitian ini dengan memanfaatkan abu sekam padi sebagai sumber silika untuk pembuatan natrium silikat (Na­2SiO3(ASP)). Modifier yang digunakan adalah N1-(3-trimethoxysilylpropyl)diethylentriamine (TMPDT) dan ion logam Pb(II) berfungsi sebagai templat. Uji kapasitas adsorpsi SiO2‒TMPDT‒Pb‒Imp terhadap ion logam Pb(II) dilakukan pada variasi pH (1 ‒ 6) dan waktu kontak (0 ‒ 120) menit dengan sistem batch. Karakterisasi material SiO2‒TMPDT‒Pb-Imp dilakukan dengan menggunakan Fourier Transform Infrared (FTIR), Scanning Electron Microscope and Energy Dispersive X-ray (SEM-EDX), dan Surface Area Analyzer (SAA).  Berdasarkan data FTIR dan SEM-EDX menunjukkan bahwa material SiO2‒TMPDT‒Pb‒Imp memiliki gugus silanol (Si‒OH); siloksan (Si‒O‒Si); alkana dan gugus amin dengan morfologi material yang halus serta terdapat unsur karbon (C) dan nitrogen (N) sebanyak 44,4% dan 8,3% secara berurutan. Hasil karakterisasi dengan SAA menunjukkan bahwa material SiO2‒TMPDT‒Pb‒Imp memiliki luas permukaan sebesar 7,418 m2/g, volume pori total sebesar 0,012 cc/g dan jari-jari pori sebesar 16,670 Å. Kondisi terbaik adsorpsi ion logam Pb(II) terjadi pada pH 5 dan waktu kontak 60 menit yang mengikuti model kinetika adsorpsi Pseudo Orde 2 dengan kapasitas adsorpsi sebesar 1,2418 mg/g.

Utilization of Silica from Rice Husk Ash for Preparing Imprinted Ionic Materials as Pb(II) Metal Ion Adsorbent. Imprinted ionic Pb(II) (SiO2-TMPDT-Pb-Imp) material was synthesized using a solution of sodium silicate from rice husk ash (Na­2SiO3(RHA)) in this study using rice husk ash as a source of silica for sodium silicate (Na2SiO3(ASP)). The modifier used is N1-(3-trimethoxysilylpropyl) diethylenetriamine (TMPDT) and Pb(II) metal ion as a template. The SiO2‒TMPDT‒Pb‒Imp adsorption capacity of Pb(II) metal ion was performed on solution pH (1 ‒ 6) and contact time of (0 ‒ 120) minutes by the batch system. Material characterization was performed by Fourier Transform Infrared (FTIR), Scanning Electron Microscope and Energy Dispersive X-ray (SEM-EDX), and Surface Area Analyzer (SAA). Based on FTIR and SEM-EDX showed that SiO2‒TMPDT‒Pb‒Imp had a silanol group (Si‒OH), siloxane group (Si‒O‒Si), alkane and amine group with finer material morphology and presence of carbon (C) and nitrogen (N) element of 44.4% and 8.3% respectively. SAA characterization indicated that SiO2‒TMPDT‒Pb‒Imp had a surface area of 7.418 m2/g, total pore volume of 0.012 cc/g, and pore radius of 16.670 Å. The optimum condition of Pb(II) metal ion adsorption was obtained at pH 5 and a contact time of 60 min that followed the Pseudo Orde 2 adsorption kinetic model with an adsorption capacity of 1.2418 mg/g.

Keywords

rice husk ash; adsorption; imprinted ionic; Pb(II); silica.

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DOI: https://doi.org/10.20961/alchemy.19.2.70373.162-169

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