ABSTRAKSintesis silika gel termodifikasi gugus sulfonat telah dilakukan melalui interaksi silika gel dengan larutan γ-glisidoksipropiltrimetoksisilan pada temperatur 90 o C selama 30 menit. Produk yang diperoleh diinteraksikan dengan garam mononatrium asam 4-amino-5-hidroksi-2,7-naftalenadisulfonat menghasilkan adsorben. Karakterisasi adsorben dilakukan menggunakan spektrofotometer inframerah. Ketiga adsorben yang diperoleh digunakan untuk menentukan kapasitas adsorpsi Mg(II) pada berbagai pH. Adsorpsi dilakukan dalam sistem batch dan jumlah ion logam teradsorpsi dihitung berdasarkan ion logam tersisa dalam larutan yang diukur menggunakan spektroskopi serapan atom. Adanya interaksi antara silika gel G tipe-60 dan garam mononatrium asam 4-amino-5-hidroksi-2,7naftalenadisulfonat ditunjukkan melalui spektrometer infra-merah pada bilangan gelombang di daerah 1458 cm -1 untuk S=O dari gugus sulfonat dan hilangnya bilangan gelombang di daerah 900 cm -1 dari gugus epoksi. Kapasitas adsorbsi Mg(II) tertinggi adalah 4,9 x 10 -5 mol/gram terjadi pada pH 5. Kata kunci: adsorpsi, silika gel, gugus sulfonat.ABSTRACT Synthesis of silica gel modified sulfonic group was carried out by interaction silica gel G type-60 with γ-glycidoxypropyltrimethoxysilane at 90 o C for 30 minutes. The product was interacted with monosodium salt of 4-amino-5-hydroxy-2,7-naphthalene-disulfonic acid to yield adsorbent. The adsorbent characterization was done by IR spectrometry. The adsorbent was used to determine the adsorption capacity of Mg(II) at various pH. Adsorption was conducted in a batch system and the amount of adsorbed metal ions was calculated based on metal ions remaining in the solution measured by atomic adsorption spectrometry (AAS). Results showed that interaction between silica gel G type-60 and monosodium salt of 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid was indicated by IR spectra at 1458 cm -1 due to S=O of sulfonic and loosing IR spectra at 900 cm -1 due to opening epoxy groups. The highest adsorption capacity was 4,9 x 10 -5 mol/gram occur at pH 5.
Adsorption of Mg(II) and Ca(II) on disulfonato-silica hybrid (DSSH) in the aqueous solution has been studied. The hybrid was synthesized by sol-gel process with sodium silicate solution from rice hull ash, chloroprophyltrimethoxysilane (CTS) and 4-amino-5-hydroxy-naphtalene-2,7-disulfonic acid monosodium salt (ANSNa) as silica source, cross linker and active group, respectively. Sodium silicate solution was reacted with CTS and ANSNa that were added dropwise. Adsorption of magnesium and calcium ions on DSSH was carried out in a batch system. Solution pH significantly affected magnesium and calcium adsorption and the optimum condition was obtained at pH = 6. The synthesized DSSH showed a high adsorption capacity of 0.0844 mmol/g and 0.1442 mmol/g for Mg(II) and Ca(II), respectively. The adsorption isotherm obtained with Langmuir isotherm model gives the negative values of ΔG°, i.e. -23.334 kJ/mol and -22.757 kJ/mol for Mg(II) and Ca(II), respectively, indicating the spontaneous process of adsorption. Kinetic studies showed that the adsorption of Mg(II) and Ca(II) ions onto HDSS follows the pseudo-second-order kinetics.
Silica gel modified with 4-amino-5-hydroxy-2,7-naphtalenedisulphonate (SG-SO3-) has been applied for adsorption of Mg(II), Cd(II), and Ni(II) in aqueous medium. In addition, three thermodynamic parameters i.e. capacity, adsorption constant and energy of adsorption were calculated. Adsorption was conducted in a batch system and metal ion remaining in the solution was determined by atomic adsorption spectrophotometry (AAS). The amount of adsorbed metal ions was calculated from the difference of metal ion concentration before and after interaction. Adsorption parameters i.e. capacity (ns2), constant (b), and energy (E) of adsorption were calculated using the equation of Langmuir isotherm. Results showed that ns2 for Mg(II), Cd(II), and Ni(II) on the adsorbent were 4.67 x 10-4, 1.19 x 10-4, and 0.13 x 10-4mol g-1, respectively. The values of b for Mg(II), Cd(II), and Ni(II) were 49.35 x 105, 173.46 x 105, and 181.12 x 105 g-1, respectively. Furthermore, it was found that E for all metal ion investigated was in the range of 26-30 kJ/mol, indicating the involvement of chemical adsorption.
ABSTRAKBahan hibrida tiol-silika telah dibuat dengan mengimobilisasikan 3-merkaptopropiltrimetoksisilan ke dalam silika melalui metode sol-gel. 3-Merkaptopropil-trimetoksisilan ditambahkan ke dalam larutan natrium silikat, kemudian diasamkan dengan HCl 6M hingga pH: 7. Larutan natrium silikat dihasilkan dari ekstraksi abu sekam padi dengan larutan natrium hidroksida mendidih. Model isoterm adsorpsi Langmuir digunakan untuk memperkirakan kapasitas dan energi adsorpsi kadmium(II). Dilakukan pula adsorpsi pada berbagai pH untuk mendapatkan kondisi yang sesuai untuk adsorpsi selektif ion logam yang dipelajari.Hasil penelitian menunjukkan bahwa Cd(II) teradsorpsi lebih tinggi pada bahan hibrida tiolsilika (SG-MPTS) dibandingkan pada silika gel tanpa gugus tiol dengan kapasitas adsorpsi berturutturut (b: 0,0208 mol/g) dan (b = 0,0156 mol/g) . Dari energi adsorpsi yang terlibat (25, 545 kJ/mol dan 27,422 kJ/mol), adsorpsi Cd(II) pada kedua adsorben dapat dikategorikan sebagai adsorpsi kimia. Untuk kedua adsorben, adsorpsi Cd(II) paling efektif pada 3
A r t i c l e I n f o A b s t r a c tKeywords: photocatalytic, glaze, Indigo carmine, Methyl Yellow, RhodamineThe mixing of silica and TiO2 and its use as catalysts has been investigated. The purpose of this study was to test the photocatalytic activity of silica/TiO2 glaze roof to degrade dyes, such as indigo carmine, rhodamine and methyl yellow. The glaze was made by mixing the soda ash, borax, glass powder as the source of silica and TiO2 functioned as the photocatalyst. Calcination was conducted at 900°C. The photocatalyst activity of the resulting glaze was performed by degradation using three different dyes. The dyes were flowed on the silica/TiO2 glaze surface for 1, 2, 3, and 4 hours. The change in dye concentration was measured by a UV-VIS spectrophotometer. The results showed that glaze production of tile could be conducted by adding TiO2 mixture on glaze. Photocatalytic results showed indigo carmine degradation was 74.58%, methyl yellow 16.08% and rhodamine 47.56%. A b s t r a kKata kunci: fotokatalitik, glasir, Indigo carmine, Metil Yellow, RhodaminePencampuran silika dan TiO2 dan penggunaan sebagai katalis telah diteliti. Tujuan dari penelitian ini adalah pengujian aktivitas fotokatalitik dari atap glasir silika/TiO2 untuk mendegradasi zat warna, seperti indigo carmine, rhodamin dan methyl yellow. Glasir dibuat dengan mencampur abu soda, boraks, serbuk kaca yang dikenal sebagai sumber silika dan TiO2 yang difungsikan sebagai fotokatalis. Pembakaran dilakukan dua kali pada 900°C. Aktivitas fotokatalis dari glasir yang dihasilkan dilakukan dengan uji kinerja degradasi menggunakan tiga pewarna berbeda. Pewarna dialirkan pada permukaan glasir silika / TiO2 selama 1, 2, 3, dan 4 jam. Perubahan konsentrasi zat warna diukur dengan spektrofotometer UV-VIS. Hasil penelitian menunjukkan produksi glasir genteng dapat dilakukan dengan menambahkan campuran TiO2 pada glasir. Hasil fotokatalitik menunjukkan degradasi indigo carmine adalah 74,58%, methanyl yellow 16,08% dan rhodamin 47,56%. PendahuluanPenelitian yang mengkaji tentang penggunaan campuran silika/TiO2 sebagai katalis telah banyak dilakukan. Kebanyakan campuran silika TiO2 digunakan untuk membantu mempercepat reaksi yang melibatkan sinar UV atau yang lebih dikenal dengan proses fotokatalis. Penelitian tersebut antara lain degradasi metil yellow dan rhodamin menggunakan katalis lempung terpilar SiO2/TiO2 [1, 2], degradasi larutan metil orange menggunakan fotokatalis nanopartikel TiO2/SiO2[3] dan adsorpsi dan dekomposisi larutan organik volatil oleh serbuk SiO2/TiO2. Hasil penelitian tersebut membuktikan bahwa campuran silika/TiO2 dapat digunakan sebagai fotokatalis, yaitu mampu mendegradasi zat warna dengan bantuan sinar UV. Selain itu, TiO2 dapat digunakan sebagai pereduksi emisi gas buang khususnya gas NOx dan CO, dengan prinsip fotokatalis. Fotokatalis merupakan suatu reaksi kimia yang melibatkan sinar UV dan katalis padat.
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