Adsorption of Hg2+ on cyclophosphazene and triazine moieties based inorganic-organic hybrid nanoporous materials synthesized by microwave assisted method

Removal of Uranium from Aqueous Solution and Simulated Seawater Using a Mixed Matrix Membrane Fabricated by Cyclophosphazene and Triazine-Based Inorganic–Organic Hybrid Material

“…The negative ΔS and ΔH values indicate the decrease in randomness and exothermic nature of adsorption, respectively. 14,42,56 Moreover, the ΔG values obtained from eq 17 at 288, 298, 308, 318, and 328 K that are −22, −19.3, −18.6, −9.5, and −7 kJ mol −1 , respectively, corroborate with the above discussion and signify spontaneity of the adsorption process.…”

“…28,51 Moreover, as shown in the high-resolution C 1s spectrum (Figure S2b), the peak at 285 eV is attributed to sp 2 -C of the triazine ring and the peak at 283.1 eV can be assigned to graphitic impurity from the carbon tape used for XPS investigation. 14,42 The peak at 131.4 eV in the high-resolution P 2p spectrum (Figure S2c) is attributed to the �P�N� functional group present in the framework. 42,44,49 The elemental composition of CTHM-2 as carried out using CHNS analysis reveals carbon, nitrogen, and sulfur contents of 16, 22, and 46 wt %, respectively.…”

“…The electrostatic repulsion plays an important role in the uranium removal after 300 min as only the size exclusion principle does not hold well for the separation. [26][27][28][29]42 Further, to compare the performance of MMM-2 at a relatively lower feed concentration, the 2.5 ppm initial uranium concentration was chosen, keeping all other experimental conditions identical. The membrane provides safe drinking water for only 6 h within the permissible limit (Figure 4c).…”

“…The obtained whitish-yellow powdered product was washed several times with water and ethanol and finally dried at 343 K overnight in a vacuum oven. 42,43…”

“…The mixed matrix membrane (MMM-2) was fabricated by using CTHM-2 as the adsorbent. 42 The casting solution was prepared by dispersing 4 wt % of CTHM-2 (0.17 g) and 17 wt % of PES (4.25 g) in NMP and stirred for 300 min at 333 K. Further, the solution was cast on the flat sheet non-woven porous support on a glass slide by using 150 μm of the casting blade. The MMM-2 was prepared by the phase inversion method.…”