Al-Bentonite Production and Adsorption of 75Se Radioisotope on Al-Bentonite

Yıl 2015, Cilt: 27 Sayı: 4, 97 - 103, 06.05.2016

Esra Oruçoğlu , Sevilay Hacıyakupoğlu

https://doi.org/10.7240/mufbed.40043

Öz

In this study, the investigation of Se(IV) adsorption on modified Reşadiye bentonite with aluminium-polioxy cations was investigated. In adsorption experiments, 75Se that was produced by neutron activation in İTÜ TRIGA MARK II nuclear research reactor and has similar chemical properties but shorter half-life with 79Se. Adsorption experiments on modified bentonite were implemented by using batch technique for various time and solid-liquid ratios by using measurements with high resolution gamma spectrometry system. The characterization with XRD, FTIR, and TGA-DTG methods confirmed that aluminium-polioxy cations interchalated to the interlayers and the bentonite structure was not affected. The basal spacing of the modified bentonite and the zeta potential is obtained as 1.853 nm 45.3±6.1 mV, respetively. Due to the realized structural changes, inorganic modification improves the adsorption ability of Reşadiye sodium bentonite from 2% to 100%. Evaluation of adsorption results showed that adsorption mechanism follows the pseudo second order reaction kinetic.

Anahtar Kelimeler

Adsorption, Al-bentonite, waste, Reşadiye, selenium, 75Se

Al-Bentonit Üretimi ve 75Se Radyoizotopunun Al-Bentonitte Adsorpsiyonu

Öz

Bu çalışmada, Se(IV) anyonlarının, aluminyum-polioksi katyonları kullanılarak Reşadiye bentonitinden hazırlanan inorganik bentonite adsorpsiyonu konusunda araştırmalar gerçekleştirilmiştir. Adsorpsiyon deneylerinde ⁷⁹Se ile benzer kimyasal özelliklere sahip ve daha kısa yarı ömürlü ⁷⁵Se radyoizotopu kullanılmıştır. Bu izotop İTÜ TRIGA MARK II nükleer araştırma reaktöründe, nötron aktivasyonu yöntemiyle üretilmiştir. Kesikli adsorpsiyon yöntemi uygulanarak, modifiye bentonitin değişen süre ve katı/sıvı oranı için adsorpsiyon kapasiteleri gamma spektroskopi sisteminde ölçülerek, elde edilmiştir. Alumünyum-polioksi katyonlarının bentonitin aratabakalarına girdiği ve yapıyı etkilemediği, kullanılan XRD, FTIR, TGA/DTG karakterizasyon yöntemleriyle belirlenmiştir. Modifiye bentonitin bazal boşluk mesafesinin 1.853 nm, yüzey yükünün 45.3±6.1 mV olduğu tesbit edilmiştir. Yüzey özelliklerinde meydana gelen değişim nedeniyle, inorganik modifikasyon Reşadiye sodyum bentonitinin selenyum adsorpsiyon verimini1 mM selenyum çözeltisi için %2’den %100 oranına arttırmıştır. Adsorpsiyon deneyleri sonucu, adsorpsiyon mekanizmasının sanal ikinci derece reaksiyon kinetiğine göre gerçekleştiği belirlenmiştir.

Anahtar Kelimeler

Adsorpsiyon, Al-bentonit, atık, Reşadiye, selenyum, 75Se.

Kaynakça

• Yan, L., Xu, Y., Yu, H., Xin, Xi., Wei, Q., & Du, B. (2010). Adsorption of Phosphate from Aqueous Solution by Hydroxy-Aluminum, Hydroxy-iron and Hydroxy-iron–aluminum Pillared Bentonites. Journal of Hazardous Materials, 179, 244–250.
• Akçay, M. (2004). The Catalytic Acylation of Alcohols with Acetic Acid by Using Lewis Acid Character Pillared Clays. Applied Catayisis A, 269, 157–160.
• Bahranowski, K. Kielski, A., Serwicka, E.M., Wisİa- Walsh, E., & Wodnicka, K. (2000). Influence of Doping with Copper on the Texture of Pillared Montmorillonite Catalysts. Microporous Mesoporous Materials, 41, 201-215.
• www.mta.gov.tr/v2.0/turkiye_maden/maden_ potansiyel_2010/Tokat_Madenler.pdf
• Boylu, F., Çinku, K., Esenli, F., & Çelik, M. S. (2010). The Separation Efficiency of Na-Bentonite by Hydrocyclone and Characterization of Hydrocyclone Products. International Journal of Mineral Processing, 94, 3-4, 196-202.
• Haciyakupoglu, S., Orucoglu E., (2013). 75Se Radioisotope Adsorption Using Turkey’s Reşadiye Modified Bentonites. Applied Clay Science, 86, 190-19.
• ISO 18589-3 (2007). International Standard, Measurement of Radioactivity in the Environment Soil, Part 3: Measurement of Gamma-emitting Radionuclides, ISO, Geneva.
• Chen, G., Shan, X., Zhou, Y., Shen, X., Huang, H., & Khan, S. (2009).Adsorption Kinetics, Isotherms and Thermodynamics of Atrazine on Surface Oxidized Multiwalled Carbon Nanotubes. Journal of Hazardous Materials, 169, 1-3, 912-918.
• Ho, Y.S., & McKay, G. (1999). Pseudo-second Order Model for Sorption Processes. Process Biochemistry, 34, 451–465.
• Su J., Huang H.-G., Jin X.-Y., Lu X.-Q., & Chen Z.- L. (2011). Synthesis; Characterization and Kinetic of a Surfactant-modified Bentonite Used to Remove As(III) and As(V) from Aqueous Solution. Journal of Hazardous Materials, 185, 63–70.
• Baskaralingam, P., Pulikesi, M., Elango, D., Ramamurthi, V., & Sivanesan, S. (2006). Adsorption of Acid Dye onto Organobentonite. Journal of Hazardous Materials, 128, 138–144.
• Dong Liu, Shuqin Yang Peng, X., Luan, Z., Chen, F., Tian, B., & Jia, Z. (2005). Adsorption of Humic Acid onto Pillared Bentonite. Desalination, 174, 135-143.
• Gu, L. Xu, J., Lv, L., Liu, B., Zhang, H., Yu, X., & Luo, Z. (2011). Dissolved Organic Nitrogen (DON) Adsorption by Using Al-pillared Bentonite. Desalination, 269, 206–213.
• Yang, Z., Xiao, O., Chen, B., Zhang, L., Zhang, H., Niu, X., & Zhou, S., (2013). Perchlorate Adsorption from Aqueous Solution on Inorganic-pillared Bentonites, Chemical Engineering Journal, 223, 31– 39.
• Zhu, L., & Zhu R., (2007). Simultaneous Sorption of Organic Compounds and Phosphate to Inorganic– Organic Bentonites from Water. Separation and Purification Technology, 54, 71-76.
• Orucoğlu, E., (2011). Reşadiye Bentoninin Organik ve İnorganik Katyonlarla Modifikasyonu ve Modifiye Ürünlerde 75Se Radyoizotopunun Adsorpsiyonunun İncelenmesi. Doktora Tezi, İ.T.Ü. Enerji Enstitüsü.
• Tabak, A., Afsin, B., Caglar, B., & Koksal, E., (2007). Characterization and Pillaring of a Turkish Bentonite (Resadiye), Journal of Colloid and Interface Science, 313, 5–11.
• Hongyan, X., Aihong, G., Hongfei, X., & Yonggang, W. (2009). Preparation and Characterization of Al- pillared montmorillonites. International Conference on Environmental Science and Information Application Technology, DOI 10.1109/ESIAT.2009.449,
• Qin, Z., Yuan, P., Zhu, J., & He, H. (2010). Influences of Thermal Pretreatment Temperature and Solvent on the Organosilane Modification of Al13-intercalated/ Al-pillared Montmorillonite. Applied Clay Science, 50, 546–553.
• Canizares, P., Valverde, J.L., Sun Kou, M.R., & Molina, C.B., (1999). Synthesis and Characterization of PILCs with Single and Mixed Oxide Pillars Prepared from Two Different Bentonites, a Comparative Study. Microporous Mesoporous Materials, 29, 267–281.
• Xue, W., He, H., Zhu, J., & Yuan, P. (2007). FTIR Investigation of CTAB–Al–montmorillonite Complexes. Spectrochimica Acta A, 67, 1030–1036.