Preparation of various sorbents from agro waste to remove some radionuclides and organic species from aqueous solutions
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Preparation of various sorbents from agro waste to remove some radionuclides and organic species from aqueous solutions A. H. Elgazzar1 · Mahmoud M. S. Ali1 · A. A. El‑Sayed1 · E. A. Saad2 Received: 18 August 2020 / Accepted: 21 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Delonix regia pods have been used to produce high-efficiency and low-cost activated carbons using different activation methods. The ability of these prepared sorbents to remove cations [137Cs, 85Sr, La(III), Eu(III), Co(II), U(VI)] and anions [75Se, Cr(VI), Mo(VI)] was evaluated in mono-component systems and the sorbents number 11, 13, 25, and 35 showed high removal efficiency. These sorbents also show the high ability to remove organic pollutants such as methylene blue and phenol. This study highlighted the extensive applicability of these low-cost sorbents in the sequestration of anionic and cationic radionuclides from real radioactive wastewaters and different environmental samples. Keywords Delonixregia pods · Activated carbons · Radionuclides and organic species · Removal
Introduction Environmental pollution is a serious problem due to increasing anthropogenic activities associated with the growth of technology. The environment is significantly affected by the radioactive contaminants that are released from nuclear fission reactors, TENORM, and medical wastes as well as nuclear accidents in Chernobyl and Fukushima, which sparked the attention of scientists to solve this problem [1, 2]. Radioactive waste includes several radioisotopes that are extremely dangerous to humans and the surrounding environment as a result of harmful ionizing radiation. The degree of risk is determined on the basis of the concentration of radioactive waste, the amount of energy released from it, the type of radiation, and the distance between the body parts and the radioactive source [2]. Organic pollutants (including phenolic derivatives, polycyclic aromatic compounds, extractants and analytical reagents) are often found in the environment as a result of their wide laboratories and industrial uses. In scientific laboratories many organic compounds (PAR, Arsenazo-III, HDEHP, Methylene blue, Surfactants,
* Mahmoud M. S. Ali [email protected]; [email protected] 1
Hot Laboratories and Waste Management Center, Atomic Energy Authority, Cairo 13759, Egypt
Faculty of Science, Ain Shams University, Cairo, Egypt
2
EDTA, DTPA and TBP) are used in the extractive separation and determination processes of many metals. They are common contaminants in wastewater and many of them are known to be very toxic (carcinogenic and harmful) to organisms even at low concentrations. Hard legislation on the evacuation of these toxic organic makes it then necessary to develop various efficient technologies for the extirpation of organic pollutants from wastewater [3, 4]. Although many methods have been developed to concentrate or process metal ions from aqueous solutions, few of them have been accepted because of the high cost, and low efficiency. Sorpt
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