Optimization of carboxyl-functionalized mesoporous silica for the selective adsorption of dysprosium

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy3+

“…On the one hand, the host–guest electrostatic interaction is stronger due to its lowest zeta potential; on the other hand, the coordination interaction derived from free carboxyl (proved in Section ) contributes to the superior adsorption induced by the relatively rich carboxyl and the high specific surface area. Besides, a capacity of 150.6 mg g –1 was also found to be higher than those of most of the reported adsorbents, including carbon-based and silica-based materials, − ,− as listed in Table . The hierarchical porous ZIF-8 showed a much higher adsorption capacity than UiO-66-(COOH) 2 -B10 .…”

“…Up to now, various techniques such as photocatalysis, microwave catalysis, solvent extraction, chemical precipitation, and adsorption have been developed for wastewater treatment. − Photocatalysis was considered a green and cost-effective approach. Microwave-induced catalysis also attracted attention for its rapid selective heating, enhanced reaction speed, and absence of secondary pollutants.…”

“…Although chemical precipitation is a simple and low-cost process, the purity and recovery ratio of products still need improvement. Compared to the methods mentioned above, adsorption has several advantages such as simple operation, low cost, and good selectivity based on a suitable adsorbent. , In recent years, varieties of adsorbents were explored to capture Dy 3+ from aqueous solutions, such as silica-based materials , and activated carbons . However, these materials may have drawbacks in adsorption performance, such as capacity, kinetics, and recyclability.…”

Novel magnetic nanocomposite of calcium alginate carrying poly(pyrimidine-thiophene-amide) as a novel green synthesized polyamide for adsorption study of neodymium, terbium, and dysprosium rare-earth ions

“…[P(AAm-EP)] 118.3 [47] P(HEMA-Hap) 109.66 [48] Poly(amidoxime-hydroxamic acid) 125 [49] J o u r n a l P r e -p r o o f resins CaHAP/NF 130.43 [50] Acryloyl-phenyl thiourea 74.23 [51] Hybrid Lewis base ligands functionalized alumina-silica 125.4 [52] CA@Fe3O4 NPs 41 [53] 11-Molybdo-vanadophosphoric acid supported on Zr modified mesoporous silica SBA-15 50 [54] MPS (22 nm)-2NH-2COOH 44.8 [55] o-CNCs/GO-IIPs 48.14 [56] Imprinted mesoporous silica materials 22.33 [57] CA…”

“…10B, the equilibrium state of the adsorption process occurs after approximately 50 min of contact time. At first, the rate of reaction is relatively fast, and the values of adsorption efficiencies in the first 2.5 min are 60.59 % (Nd +3 ), 55.92 % (Tb +3 ), and 57.31 % (Dy +3 ), and then a lower rate is seen and eventually no more notable adsorption is obtained beyond 50 min for each ion. At the beginning of the process, the higher REEs adsorption efficiency is as a result of a large number of vacant functional groups of CA/P(P-T-A)/NZFO.…”