title: Rice straw modified by click reaction for selective extraction of noble metal ions.
abstract: Rice straw was modified by azide-alkyne click reaction in order to realize selective extraction of noble metal ions. The ability of the modified straw to adsorb Pd(2+) and Pt(4+) was assessed using a batch adsorption technique. It was found that the sorption equilibrium could be reached within 1h and the adsorption capacity increased with temperature for both Pd(2+) and Pt(4+). The maximum sorption capacities for Pd(2+) and Pt(4+) were respectively attained in 1.0 and 0.1 mol/L HCl. The modified straw showed excellent selectivity for noble metal ions in comparison to the pristine straw. In addition, the modified straw was examined as a column packing material for extraction of noble metal ions. It was indicated that 1.0 mL/min was the best flow rate for Pd(2+) and Pt(4+). The modified straw could be repeatedly used for 10 times without any significant loss in the initial binding affinity.
authors.affiliation: School of Materials Engineering, Key Laboratory for Ecological-Environment Materials of Jiangsu Province, Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China. Electronic address: jjwang1@hotmail.com.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Materials Engineering, Key Laboratory for Ecological-Environment Materials of Jiangsu Province, Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Wei
authors.affiliation: School of Materials Engineering, Key Laboratory for Ecological-Environment Materials of Jiangsu Province, Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Li
mesh_terms: D000327:Adsorption; D057930:Click Chemistry / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008670:Metals / Q000302:isolation & purification*; D005741:Noble Gases / Q000302:isolation & purification*; D012275:Oryza / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014866:Waste Products / Q000032:analysis*
chemical_list: D007477:Ions; D008670:Metals; D005741:Noble Gases; D014866:Waste Products
keywords: Click reaction; Extraction; Noble metal ions; Rice straw; Sorption