REDUKSI ION KROMIUM HEKSAVALEN MENGGUNAKAN FOTOKATALIS ZEOLIT ALAM TEREMBANKAN TiO2 DAN RADIASI SINAR UV
Abstract
ABSTRAK: Tujuan penelitian adalah mempelajari kemampuan katalis zeolit alam terembankan TiO2 (zeolit alam/TiO2) untuk reduksi ion kromium heksavalen [Cr(VI)] pada variasi massa pengembanan TiO2 terhadap zeolit alam, variasi waktu penyinaran, dan variasi pH larutan Cr(VI). Selain itu, dipelajari pula keterkaitan antara persentase reduksi Cr(VI) terhadap karakteristik zeolit alam/TiO2 pada kondisi optimumnya. Katalis zeolit alam/TiO2 dianalisis asam-basa permukaan secara titrasi asam-basa, gugus fungsi permukann dengan fourier transform infrared (FTIR), luas permukaan secara sorpsi methylene blue, kristalinitas dan rerata ukuran kristal ditentukan dengan X-ray diffraction (XRD), dan morfologi permukaan dengan scanning electron microscopy (SEM). Jumlah Cr(VI) yang tereduksi dalam proses fotokatalisis dianalisis dengan spektroskopi UV-vis. Hasil penelitian menunjukkan bahwa karakteristik terbaik diperoleh pada katalis zeolit alam/TiO2 (100:9). Kondisi optimum reduksi Cr(VI) oleh zeolit alam/TiO2 (100:9) diperoleh pada waktu penyinaran 60 menit dan pH larutan 1, dengan reduksi sebesar 94,73% lebih efektif dibandingkan TiO2 tunggal (77,09%). Katalis tersebut potensial digunakan untuk reduksi Cr(VI).
Kata kunci: zeolit alam/TiO2, Cr(VI), fotokatalis, reduksi
ABSTRACT: Research to study the ability of TiO2 inserted natural zeolite (natural zeolite/TiO2) for reduction of hexavalent chromium ions [Cr(VI)] on various massa of TiO2 insertion toward natural zeolite, irradiation time, and pH of Cr(VI) solution was done. The other hand, relationship of percentage Cr(VI) reduction to natural zeolite/TiO2 characteritics on its optimum condition could be determinated too. Catalyst of natural zeolite/TiO2 was analyzed surface acidity-basicity by acid-base titration method, surface fuctional groups by FTIR, surface area by sorption of methylene blue, crystallinity and mean crystal size by XRD, and surface morphology by SEM. The amount of Cr(VI) reduction in photocatalytic were analyzed by UV-vis spectroscopic. Result showed that the catalyst of natural zeolite/TiO2 (100:9) had best characteristics. The optimum condition of Cr(VI) reduction were irradiation time of 60 minutes and pH 1, with percentage its reduction of 94.73% more effective than TiO2 catalyst (77.09%), which was potential to Cr(VI) reduction.
Downloads
References
[2] WHO. 2011. Guidelines for Drinking Water Quality. Fourth Edition. World Health Organization.
[3] Suksabye, P., Nakajima, A., Thiravetyan, P., Baba, Y. and Nakbanpote, W. 2009. Mecanism of Cr(VI) Adsorption by Coir Pith Studied by ESR and Adsorption Kinetic. J. Hazard. Mater. 161. 1103-1108.
[4] Simpen, IN., Suastuti, N.G.A.M.D.A., Negara, IM.S., and Ratnayani, O. 2018. Adsorption of Cr(VI) Using the Adsorbent of Hydroxyapatite Extracted from Bali Bovine Bone Waste and Coated with Fe-Al Oxides. Res J. Chem. Environ. Sci. 6(5): 23-29.
[5] Madani, M.E., Harir, M., Zrineh, A., and Azzouzi, M.E., 2015. Photodegradation of Imazethapyr Herbicide by using Slurry and Supported TiO2: Efficiency Comparison. Arab. J. Chem. 8. 181-185.
[6] Abdennouri, M., Baalala, M., Galadi, A. Makhfouk, M.E. Bensitel, M., Nohair, K., Sadiq, M., Boussaoud, A., and Barka, N. 2016. Photocatalytic Degradation of Pesticides by Titanium Dioxide and Titanium Pillared Purified Clays. Arab. J. Chem. 9. 313-318.
[7] Fatimah, I., Wang, S., Narsito, Wijaya, K. 2010. Composites of TiO2-Aluminium Pillared Montmorillonite: Syntesis, Characterization and Photocatalytic Degradation of Methylene Blue. Apllied Clay Sci. 50. 588-590.
[8] Slamet, Ellyana, M., dan Bismo, S. 2008. Modifikasi Zeolit Alam dengan Fotokatalis TiO2 melalui Metode Sol Gel dan Aplikasinya untuk Penyisihan Fenol. Laporan Penelitian. Departemen Teknik Kimia. FakultasTeknik. Universitas Indonesia.
[9] Slamet, Abrianti, R., dan Marliana, E. 2007. Pengolahan Limbah Cr(VI) dan Fenol dengan Fotokatalis Serbuk TiO2 dan Cu/TiO2. Widyanuklida. 11(2): 78-85.
[10] Fauzi, W.A., Simpen, IN., dan Sudiarta, IW. 2019. Sintesis dan Karakterisasi Zeolit-TiO2 serta Pemanfaatannya sebagai Fotokatalis untuk Degradasi Rhodamin B. Jurnal Kimia. 13(1): 82-88.
[11] Ma, C.M., Shen, Y.S. and Lin, P.H. 2012. Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/TiO2 Photocatalytic Processes. Int. J. Photoenergy. 7. 1-7.
[12] Ramataobane, K., and Mphela. 2016. Photocatalytic Degradation of Salicylic Acid and Reduction of Cr(VI) using TiO2. Int. J. Res. Chem. Metallurgi. and Civil Eng. 3. 2349-1450.
[13] Ma, C., Wang, F., Zhang, C., Yu, Z., Wei, J., Yang, Z., Li, Y., Li, Y., Zhu, M., Shen, L., and Zeng, G. 2017. Photocatalytic Decomposition of Congo Red under Light Irradiation using MgZnCr-TiO2 Layered Double Hydroxide. Chemospere. 168. 80-90.
[14] Simpen, IN. 2001. Preparasi dan Karakterisasi Lempung Montmorillonit Teraktivasi Asam Terpilar TiO2. Tesis. Universitas Gajah Mada. Yogyakarta.
[15] Agusty, I.P. 2012. Penggunaan Zeolit Terimpregnasi TiO2 untuk Mendegradasi Zat Warna Congo Red. Skripsi. Departemen Kimia. Fakultas Sains dan Teknologi. Universitas Airlangga. Surabaya.
[16] Stuart, B., and Ando, D.J. 1999. Modern Infrared Spectroscopy. John Wiley & Sons, New York.
[17] Utubira, Y., Wijaya, K., Triyono, E. 2006. Preparasi dan Karakterisasi TiO2-Zeolit Serta Pengujiannya pada Degradasi Limbah Industri Tekstil secara Fotokatalitik. Indones. J. Chem. 6(3): 231-237.
[18] Fadhil, D.H. 2017. Titanium oxide Nanoparticles: Analysis and Photodegradation activity for Hexamethylpararosaniline chloride. J. Pharm. Sci. & Res. 9(5): 685-689
[19] Mphela, R K., Msimanga, W., Pete, K Y.,Chiririwa, H., and Ochieng, A., 2016, Photocatalytic Degradation of Salicylic Acid and Reduction of Cr(VI) using TiO2, Int. J. Res. Chem. Metallurgi. and Civil Eng.3.
[20] Park, H. and Choi, W. 2005. Photocatalitic Reactivities of Nation-Coated TiO2 for the Degradation Changed Organic Compounds under UV or Visible Light. J. Phys. Chem. B. 109(23):11667-11674.
[21] Okitsu, K., Iwasaki, K., Yobiku, Y., Bandow, H., Nishimura, R., and Maeda, Y. 2005. Sonochemical Degradation of Azo Dyes in Aqueos Solution: a New Heterogeneous Kinetics Model Taking into Account the Local Concentration of OH Radicals and Azo Dyes, J. Ultrasonic Sonochem. 12(4): 255-262.
[22] He, Z., Sun, C., Yang, S., Ding, Y., He, H., and Wang, Z. 2009. Photocatalitic Degradation of Rhodamine B by Bi2WO6 with Electron Accepting Agent under Microwave Irradiation: Mechanism and Partway. J. Hazard. Mater. 162. 1477-1486.
Petunjuk Penulisan
