Karakterisasi dan Uji Efektivitas Allophane-Like untuk Adsorpsi Ion Logam Tembaga (Cu)

Pranoto Pranoto, Tri Martini, Deta Agustin Rachmawati

Abstract

Telah dilakukan penelitian karakterisasi dan uji efektivitas allophane-like untuk adsorpsi ion logam tembaga (Cu). Allophane-like dibuat dengan mencampurkan larutan Tetraethyl Orthosilicate (TEOS) dan Aluminum Nitrate Nonahydrate [Al(NO3)3.9H2O] dengan menggunakan rasio Al/Si 0,5; 0,75; 1; 1,25 dan 1,5. Proses pencampuran dilakukan penambahan NaOH secara bertahap dan dilakukan pengadukan serta pemanasan. Penambahan NaOH dilakukan dengan membuat perbandingan (OH/Al) rasio 3. pH campuran larutan yang diperoleh diukur dan pH larutan dibuat menjadi asam (pH 3-4). Allophane-like dikarakterisasi dengan spektroskopi infra merah (FTIR), XRD, keasaman, dan luas permukaan. Uji adsorpsi terhadap ion logam tembaga (Cu) dilakukan pada variasi komposisi Al/Si 0,5; 0,75; 1; 1,25 dan 1,5, pH larutan tembaga (Cu) 3-7 serta waktu kontak 30-120 menit dengan sistem batch. Hasil penelitian diketahui bahwa allophane-like memiliki gugus fungsi yang sama dengan allophane-alam yang ditunjukkan dengan data FTIR yaitu memiliki puncak yang sama pada 3431-3252; 1631; 1071; 785; dan 562-457 cm-1. Hasil analisa XRD, keasaman dan luas permukaan menunjukkan karakteristik yang berbeda. Kondisi adsorpsi ion logam tembaga (Cu) terjadi pada rasio Al/Si 1,5, pH 6, waktu kontak 120 menit, persentase penyerapan 41,79% dan kapasitas adsorpsi 0,97865 mg/g.

Characterization and Effectivity of Allophane-Like in the Adsorption of Metal Ion of Copper (Cu). The characterization and effectivity testing of allophane-like for adsorption copper (Cu) metal ion has been studied. Allophane-like was prepared by mixing a solution of Tetraethylorthosilicate (TEOS) and Aluminum Nitrate nonahydrate [Al(NO3)3.9H2O] using Al/Si ratio of 0.5; 0.75; 1; 1.25 and 1.5. The mixing process was done gradually adding NaOH and stirring and heating. The addition of NaOH was done by making a comparison (OH/Al) ratio of 3. The pH of the mixture solution was measured and made acidic solution (pH 3-4). Allophane-like was characterized by infrared spectroscopy (FTIR), XRD, acidity, and surface area. The adsorption evaluation of copper (Cu) metal ion was done on the variation of the composition of Al/Si 0.5; 0.75; 1; 1.25 and 1.5, the pH of a solution of copper (Cu) 3-7 and contact time of 30-120 minutes in batch system. The results revealed that the allophane-like has the same functional group with nature allophane indicated by the FTIR data that has the same peak at 3431-3252; 1631; 1071; 785; and 562-457 cm-1. XRD analysis results, acidity and surface area showed different characteristics. The best conditions adsorption of copper (Cu) metal ion occured at the Al/Si ratio of 1.5, pH 6, the contact time of 120 minutes, the absorption percentage of 41.79% and adsorption capacity of 0.97865 mg/g.

Keywords

allophane-like; adsorpsi; ion logam tembaga (Cu)

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