title: Fate and transport with material response characterization of green sorption media for copper removal via desorption process.
abstract: Multiple adsorption and desorption cycles are required to achieve the reliable operation of copper removal and recovery. A green sorption media mixture composed of recycled tire chunk, expanded clay aggregate, and coconut coir was evaluated in this study for its desorptive characteristics as a companion study of the corresponding adsorption process in an earlier publication. We conducted a screening of potential desorbing agents, batch desorption equilibrium and kinetic studies, and batch tests through 3 adsorption/desorption cycles. The desorbing agent screening revealed that hydrochloric acid has good potential for copper desorption. Equilibrium data fit the Freundlich isotherm, whereas kinetic data had high correlation with the Lagergren pseudo second-order model and revealed a rapid desorption reaction. Batch equilibrium data over 3 adsorption/desorption cycles showed that the coconut coir and media mixture were the most resilient, demonstrating they could be used through 3 or more adsorption/desorption cycles. FE-SEM imaging, XRD, and EDS analyses supported the batch adsorption and desorption results showing significant surface sorption of CuO species in the media mixture and coconut coir, followed by partial desorption using 0.1 M HCl as a desorbing agent.
authors.affiliation: Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, USA. Electronic address: nchang@ucf.edu.
authors.forename: Ni-Bin
authors.initials: NB
authors.lastname: Chang
authors.affiliation: Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, USA.
authors.forename: Cameron
authors.initials: C
authors.lastname: Houmann
authors.affiliation: Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan City 32003, Taiwan, ROC.
authors.forename: Kuen-Song
authors.initials: KS
authors.lastname: Lin
authors.affiliation: Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Wanielista
mesh_terms: D000327:Adsorption; D003059:Cocos / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification*; D007700:Kinetics; D008031:Lignin / Q000031:analogs & derivatives* / Q000737:chemistry; D008962:Models, Theoretical; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; C507903:coir; D003300:Copper; D008031:Lignin
keywords: Adsorption media; Copper removal; Desorption; Material characterization; Stormwater management