Hydroxyapatite organofunctionalized with silylating agents to heavy cation removal

Sulfamic acid heterogenized on functionalized magnetic Fe3O4 nanoparticles with diaminoglyoxime as a green, efficient and reusable catalyst for one‐pot synthesis of substituted pyrroles in aqueous phase

“…The highest level of evolution in the surface immobilization strategy is the covalent attachment of an organic compound or ligand to the solid surface. [8] The incorporation of organic moieties with pendant attached chains, either on the external part or on the internal surface, is a useful method for modifying the physical and chemical properties of natural or synthesized materials. It can improve the ability of new multifunctional materials -considered as 'inorganic-organic hybrids' -to act in a variety of academic or technological activities.…”

Magnetically recoverable iron oxide–hydroxyapatite nanocomposites for lead removal

“…Although several studies have indicated that apatitebased materials can be useful for the sorption of organic molecules (Bahdod et al 2009;Bouyarmane et al 2010), they have been mostly studied for heavy metal ion removal due to the strong affinity of their surface for cationic species (Baillez et al 2007;Dybowska et al 2009). Most recent trends in apatite application to water remediation include the use of natural phosphate minerals as sorbents (Cao et al 2004;El Asri et al 2010), the surface modification of apatite by organic ligands that can enhance the material affinity for metal species (da Silva et al 2006;Saoiabi et al 2012) and the formation of apatite-based composites with improved sorption properties (Jang et al 2008;Achelhi et al 2011).…”

Surface cellulose modification with 2-aminomethylpyridine for copper, cobalt, nickel and zinc removal from aqueous solution

“…Regarding the application of natural or synthetic materials, many pristine or chemically modified polymeric compounds have been extensively applied for cation removal from aqueous solutions and these processes can provide large amounts of metal ion retention or ion exchange processes. In this context, a lot of investigated materials with excellent sorption properties are those on synthetic mesoporous silicas and silica gel supports [26][27][28] , chemically modified phyllosilicates [29][30][31] , chitosan, as obtained and after modification with a series of pendant chains 24,32,33 , synthetic phosphates 34,35 , chemically modified celluloses [6][7][8][21][22][23] and others [36][37][38] . These inorganic or biopolymer materials research fields are continuously expanding, however, the biopolymers, and specially cellulose, have a huge advantage, since they are quite abundant in nature, renewable, biodegradable and easily obtained at low cost.…”