Study of the behaviour of thorium adsorption on PAN/zeolite composite adsorbent

Studies of Modification of Zeolite by Tandem Acid-Base Treatments and its Adsorptions Performance Towards Thorium

“…Guerra et al [17] modified diquite and bentonite mineral samples from the Amazon region, Brazil with MTTZ derivative (5-mercapto-1-methyltetrazole) and the modification increased the thorium removal rate to 13% and 9% for diquite and bentonite respectively (The degree of reaction was estimated 80% for D MTTZ and 65% for B MTTZ samples). Kaygun et al [30] modified clinoptilolite (CLI) from Turkey with polyacrilonitrile (PAN) and found the equilibrium as 97.97% sorption of thorium (IV) solution was reached within 45 minutes. Metaxas et al [1] compared thorium removal by different adsorbents, i.e.…”

“…) while composite material such as CLI(PAN) have better selectivity for the capture of thorium ions, and smaller solubility in water than the respective inorganic compound [30]. However, as the manufactured adsorbents undergo a certain process to get into the final form, the cost-effectiveness of using each of these groups of adsorbents should be considered in addition to the simplicity of modification procedure and the abundance of the inorganic materials in nature.…”

“…Desilication can introduce mesoporosity to zeolite through alkaline treatment [10][11][12]. J.C. Groen in Huang (2014) suggested that for mordenite with optimal Si/Al ratios (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30), mesoporosity was introduced after it was subjected to alkaline treatment (0.2 M NaOH at 65ºC for 30 min).…”

Aqueous-Phase Sorption Behaviors of Cs<sup>+</sup>, Co<sup>2+</sup>, Sr<sup>2+</sup> and Cd<sup>2+</sup>ions on some Composite Ion Exchangers

“…Maximum sorption capacity (Q) represents monolayer coverage of sorbent with sorbate and b repre sents enthalpy of sorption and should vary with temperature [25,26].…”

“…The presence of radionuclides and toxic metals in wastes is a major environmental concern. Such wastes arise from technologies producing nuclear fuels, and from laboratories working with radioactive materials [1,2]. Various treatment technologies have been developed for the removal of heavy metals from water.…”