Abstract
Photocatalyst Co(II)-TiO2/kaolinite as a antibacterial E.coli has been successfully synthesized using sol-gel method. The purpose of this study was to determine the characteristics and Co(II)-TiO2/kaolinite photocatalyst activity as antibacterial E.coli under visible light. Synthesis of Co(II)-TiO2/kaolinite using TTIP as a precursor for Ti and CoCl2.6H2O as a precursor to Co(II) dopant. The doping process is carried out using the sol-gel method with the stages of hydrolysis, condensation, aging and calcination at a temperature of 450 ºC. The impregnation process on kaolinite was carried out using the wet impregnation method. The antibacterial activity test of E.coli under visible light was carried out using the turbidimetric method using a UV-Vis spectrophotometer at a wavelength of 600 nm. The activity test results showed that the Co(II)-TiO2 photocatalyst with a concentration of Co(II) dopant 3 %w/v had the best inhibition power reaching 35,47 %. The synthesized Co(II)-TiO2/kaolinite photocatalyst was analyzed using FTIR, XRD and UV-Vis DRS instruments. The results of FTIR analysis show that there is a shift in Ti-O absorption towards a smaller wave number which indicates that the Co(II) dopant has successfully entered the TiO2 structure. The XRD diffractogram showed that the Co(II)-TiO2/kaolinite photocatalyst had an anatse phase at 2q = 25,256º with a crystal size of 17-25 nm. UV-Vis DRS spectroscopic analysis showed a decrease in the band gap energy value from 3.35 eV to 1.69 eV.
Highlights
Co(II)-TiO2/kaolinite photocatalyst had an anatse phase at 2 = 25,256o with a crystal size of 17-25 nm
UV-Vis DRS spectroscopic analysis showed a decrease in the band gap energy value from 3.35 eV to 1.69 eV
L) terhadap pertumbuhan Streptoccocus mutans PenyebabKaries Gigi. (Skripsi), Universitas Andalas, Padang
Summary
Kualitas air bersih merupakan hal yang sangat penting bagi kesehatan. Air bersih harus memenuhi parameter yang mengacu pada Permenkes RI No 32 tahun 2017. Berdasarkan penelitian [1][2], ditemukan air bersih yang mengandung E.coli > 0 CFU/ 100 mL. TiO2 memiliki keterbatasan yaitu hanya dapat aktif pada sinar ultraviolet (UV) sehingga diperlukan modifikasi struktur elektron pada TiO2 dengan doping kation logam untuk memperluas daerah serapan ke daerah sinar tampak. Penyisipan dopan Co(II) pada struktur TiO2 menyebabkan pergeseran serapan ke daerah sinar tampak sehingga dapat meningkatkan aktivitas fotokatalitik [9][10]. Keterbatasan lain TiO2 yaitu memiliki daya serap yang rendah dan sulit untuk digunakan kembali sehingga perlu modifikasi lebih lanjut dengan melakukan impregnasi pada kaolin. TiO2 yang diimpregnasikan pada kaolin dapat meningkatkan luas permukaan TiO2 dan aktivitas katalitiknya [11]. Berdasarkan latar belakang tersebut, maka penelitian ini telah melakukan sintesis fotokatalis Co(II)TiO2/kaolin dengan metode sol-gel dan dilanjutkan ke tahap impregnasi pada kaolin menggunakan metode impregnasi basah. Fotokatalis Co(II)-TiO2/kaolin akan diuji aktivitasnya terhadap bakteri E.coli dengan metode turbidimetri dan dilakukan karakterisasi menggunakan instrumen FTIR, UV-Vis DRS dan XRD
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