title: Experimental assessment of adsorption of Cu2+ and Ni2+ from aqueous solution by oyster shell powder.
abstract: In this study, I found that oyster shell powder (OSP) can effectively adsorb Cu(2+) and Ni(2+) from wastewater, with the adsorption capacity being higher for the former ion. The isotherms for the adsorption of Cu(2+) and Ni(2+) on the OSP fitted the Langmuir, Freundlich, and Dubinin-Kaganer-Radushkevich isotherms quite well (R(2)=0.949-0.984, 0.912-0.988 and 0.900-0.990, respectively). Positive values of DeltaH degrees and DeltaS degrees indicated that these adsorptions were endothermic in nature; the values of E (between 1.722 and 3.553 kJ mol(-1)) were consistent with a physical adsorption mechanism. Moreover, the adsorptions of Cu(2+) and Ni(2+) on the OSP followed pseudo-second-order kinetics. The adsorption capacities of the OSP toward Cu(2+) and Ni(2+) were 49.26-103.1 and 48.75-94.3 mg g(-1), respectively.
authors.affiliation: General Education Center, Nano Materials Applications R&D Center and Department of Environmental Engineering, Vanung University, Chung-Li 320, Taiwan.
authors.forename: Ting-Chu
authors.initials: TC
authors.lastname: Hsu
mesh_terms: D000327:Adsorption; D000818:Animals; D001673:Biodegradation, Environmental; D003300:Copper / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D009532:Nickel / Q000737:chemistry*; D010125:Ostreidae; D011208:Powders; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D011208:Powders; D014874:Water Pollutants, Chemical; D003300:Copper; D009532:Nickel