Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions

Abstract

The aim of the work was the development of cheap and effective adsorbents based on titanium silicates deposited on the products of thermochemical processing of rice husk to extract cesium and strontium radioisotopes from aqueous media. Synthesis of adsorbents was carried out using the cheapest and widely used titanium water-soluble reagent, titanium sulfate (an intermediate product of white rutile pigment production), as feedstock. After treatment with titanium sulfate and neutralization, hydrothermal treatment was carried out in various ways. The traditional method of processing in an autoclave was used, as well as the blowing at different temperatures by steam. The distribution coefficients and the adsorption capacity for cesium and strontium ions on these sorbents were studied. Along with the chemical composition of adsorbents obtained by those ways, the type and the temperature of hydrothermal treatment also affected the adsorption properties. It was found that the adsorbent obtained by hydrothermal treatment in an autoclave has the highest degree of cesium ions extraction (Kd = 27,500). The highest degree of strontium ions extraction (Kd = 2,095,000) has an adsorbent obtained by hydrothermal treatment with water vapor blowing.

The titanium silicate influence on the Zn(II) and Sr(II) migration in the aquatic environment

“…1 and Table 1). The results, which were obtained in present work, are in good agreement with results of strontium adsorption, which were described in publications [15,16].…”

“…The synthesis of titanium silicate uses the waste of titanium production industries [15,16], which is an advantage since titanium silicate has a dual environmental be-nefit. Titanium silicate exhibited high adsorption activity toward strontium ions [15,16] from distilled water and different solutions such as 0.1M HCl, and Ringer-Locke's solution. However, the influence of co-existing ions К + , Na + , Ca 2+ , СО 3…”

Co-application of biochar and titanium dioxide nanoparticles to promote remediation of antimony from soil by Sorghum bicolor: metal uptake and plant response

“…Higher application rates of TiO 2 NPs may occupy adsorption sites on biochar surface and compete with Sb for adsorption onto biochar, which could limit biochar effectiveness in immobilization of Sb in the rhizosphere zone. High retention capacity of biochar for titanium particles was reported in the literature ( Zhuravlev, 2019 ). Moreover, co-application of biochar with TiO 2 NPs could reduce availability of metal(loid)s in soil followed by alleviated metal uptake by plant, which may result in reduced toxicity of metal(loid)s to plants and their promoted growth as observed in this study.…”

Use of synthetic inorganic ion exchangers in strontium removal

“…Sentetik zeolitler (Smiciklas vd., 2021;Jimenez-Reyes vd., 2021;Camacho vd., 2010;Olmez Aytas vd., 2004;Barkat vd., 2015), titanatlar (Lehto & Clearfield, 1987;Li vd., 2021;Taylor-Pashow vd., 2011;Jozdani vd., 2019;Guevar vd., 2017), titanosilikatlar (Anthony vd., 1994;Miller & Brown, 1997;Clearfield vd., 2012), fosfatlar (Mu vd., 2017;Ivanets vd., 2021;Tang vd., 2018;Korneikov & Ivanenko, 2020), silikatlar (Hamed vd., 2016;Zhuravlev, 2020), metal oksitler ve bunların karışımları (Shabana & El-Dessouky, 2002;Vanketasan vd., 2000;Mishra & Singh, 1995;Trivedi & Axe, 1999;Ahmadi vd., 2014;İnan & Altaş, 2010;Zhang vd., 2015) stronsiyum ve diğer radyonüklidlerin uzaklaştırılması için iyon değiştirici malzemeler olarak kullanılmıştır. Kristal silikotitanat (CST) (Park vd., 2010) (Honeywell Şirketi, ABD), Sr-Treat (Lehto vd., 1999) (Fortum, Finlandiya) ticari adı altında sodyum titanat ve katmanlı, yarı kristal bir bileşik olan sodyum nonatitanat (Na4TiO9O20) (Lehto & Clearfield, 1987) (UOP LLC, ABD) nükleer atık yönetiminde kullanılan ticari olarak mevcut iyon değiştiricileri örnekleridir.…”