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insulated materials can reduce global warming and contribute to sustainability by reducing heat gain and loss through the walls [ 7 , 8 ]. Natural zeolites are microporous materials of volcanic origin. They are a well-known group of hydrated
recycling waste glass or using natural materials, for instance, fly ash, red mud, natural zeolite, and other waste [ 15–19 ]. Zeolite-poor rocks are volcanic rocks that comprise a low proportion of zeolite (less than 10%) and additional components like
aflatoxin B 1 ( Fouad et al., 2019 ). Among them, mycotoxin absorbents, such as charcoal ( Yamauchi et al., 2014 ), zeolite and bentonite ( Prasai et al., 2018 ) and calcium aluminosilicates ( Chen et al., 2014 ) can prevent the absorption of aflatoxins
1. Introduction Zeolites have complex alumosilicate frameworks. These frameworks contain large channels and interconnected cages. We use zeolites in gas and petroleum industry, water softening, sewage treatment
Introduction Such aluminosilicates as natural zeolites and clays are the most popular cheap adsorbents widely applied in industry, environment protection, agriculture, medicine, optics, microelectronics and many other fields
Abstract
PET with 68Ga from the TiO2- or SnO2- based 68Ge/68Ga generators is of increasing interest for PET imaging in nuclear medicine. In general, radionuclidic purity (68Ge vs. 68Ga activity) of the eluate of these generators varies between 0.01 and 0.001%. Liquid waste containing low amounts of 68Ge activity is produced by eluting the 68Ge/68Ga generators and residues from PET chemistry. Since clearance level of 68Ge activity in waste may not exceed 10 Bq/g, as stated by European Directive 96/29/EURATOM, our purpose was to reduce 68Ge activity in solution from >10 kBq/g to <10 Bq/g; which implies the solution can be discarded as regular waste. Most efficient method to reduce the 68Ge activity is by sorption of TiO2 or Fe2O3 and subsequent centrifugation. The required 10 Bq per mL level of 68Ge activity in waste was reached by Fe2O3 logarithmically, whereas with TiO2 asymptotically. The procedure with Fe2O3 eliminates ≥90% of the 68Ge activity per treatment. Eventually, to simplify the processing a recirculation system was used to investigate 68Ge activity sorption on TiO2, Fe2O3 or Zeolite. Zeolite was introduced for its high sorption at low pH, therefore 68Ge activity containing waste could directly be used without further interventions. 68Ge activity containing liquid waste at different HCl concentrations (0.05–1.0 M HCl), was recirculated at 1 mL/min. With Zeolite in the recirculation system, 68Ge activity showed highest sorption.
Introduction Zeolites are crystalline aluminosilicates with 133 known frameworks. Their pores are highly monodisperse and have a fixed directionality within the crystal. The pores in these systems often have a character of
mineral admixtures to release silica. Chemical activity of silica can be increased in the presence of proper ions which act as a catalyst activating the surface of these extra grains. For example in case of natural zeolite better effect is obtained when
. 1990 Investigation of the distribution of acidity in zeolites by temperature-programmed desorption of probe molecules . J Phys Chem. 94 : 765 – 772 . 10.1021/j100365a047 . 17. Hunger
with enhanced thermal insulation produced from natural zeolite ,” Pollack Period. , vol. 16 , no. 3 , pp. 101 – 107 , 2021 . [3] A. Rincón , M. Marangoni , S. Cetin , and E. Bernardo , “ Recycling of inorganic waste in monolithic and
