Effect of high-dose γ-ray irradiation on the structural stability and U(VI) adsorption ability of bentonite

Simultaneous Recovery of Nitrogen and Phosphorus from Sewage by Magnesium Ammonium Phosphate Method with Magnesium-Loaded Bentonite

“…This occurs because when the amount of adsorbent is less, the adsorption sites can be more exposed, thus improving the adsorption capacity. However, an excessive amount of adsorbent will lead to the overlap and accumulation of adsorption sites, and reduce the contact between nitrogen and phosphorus, thus reducing the adsorption amount. − The adsorption equilibrium of PO 4 3– and NH 4 + -N by MgO-SBt was reached at 30 and 90 min, respectively. When the MgO-SBt dosage is 0.25 g/L, the maximum adsorption capacities of PO 4 3– and NH 4 + -N are 190 mg/g and 120 mg/g, respectively.…”

“…37 The characteristic peaks of O 1s illustrate the presence of M−O (M = Mg) (529.8 eV) metal-oxide bonds, M−OH (531.2 eV) formed by hydroxyl bonding on the metal, and adsorbed H−O−H molecules (532.5 eV). 38 The binding energies of 74.6 and 102.7 eV in Figure 4(j,k) are the characteristic peaks of Al 2p and Si 2p, corresponding to the Al−O bond in the Al−O octahedron and the Si−O bond in the Si−O tetrahedron in the bentonite structure, respectively 39.…”

Radiation‐induced corrosion model for copper‐coated used fuel containers. Part 1. Validation of the bulk radiolysis submodel

“…As well as potentially modifying the absorbed dose rate through electron‐hole pair generation discussed above, the bentonite may also participate in various redox processes involving the initially trapped O 2 and radiolytic oxidants and reductants (Figure 3). The bentonite‐related redox reactions included in the CCM‐RIC are (i) oxidation of pyrite, present as an accessory mineral in natural bentonite, by O 2 ; (ii) oxidative dissolution of pyrite by • OH radicals [ 28 ] ; (iii) the reduction of Fe 3+ in octahedral sites on the montmorillonite lattice by solvated electron • e aq – and • H radicals [ 25,26,29–31 ] and (iv) the reoxidation of Fe 2+ in octahedral sites on the montmorillonite lattice by H 2 O 2 . [ 32,33 ] The former two processes are assumed to occur in the bulk porosity as large pores are likely to form around nonclay particles in the bentonite, and the latter two processes are assumed to be restricted to the interlayer porosity.…”

“…As well as potentially modifying the absorbed dose rate through electron-hole pair generation discussed above, the bentonite may also participate in various redox processes involving the initially trapped O 2 and radiolytic oxidants and reductants (Figure 3). The bentonite-related redox reactions included in the CCM-RIC are (i) oxidation of pyrite, present as an accessory mineral in natural bentonite, by O 2 ; (ii) oxidative dissolution of pyrite by • OH radicals [28] ; (iii) the reduction of Fe 3+ in octahedral sites on the montmorillonite lattice by solvated electron • e aq and • H radicals [25,26,[29][30][31] and…”

Long-Term Chemical Alteration of 238Pu-Doped Borosilicate Glass in a Simulated Geological Environment with Bentonite Buffer

“…Radiation effects in bentonite and other clay materials had been studied mainly in terms of the stability of clay materials under external gamma-irradiation [9][10][11]. It was shown that bentonite has high radiation stability and preserves crystallinity with no significant changes in its structure at accumulated doses as high as 3 × 10 10 rad at room temperature and at 3.5 × 10 9 rad at 300 • C [12,13]. However, the radiation stability of bentonite under external and internal alpha-irradiation is still unclear.…”