title: Cadmium removal from wastewater by sponge iron sphere prepared by hydrogen reduction.
abstract: A new type of sponge iron sphere (NSIS) with 1-5 mm diameter, made of concentrated iron powder and possessed high activity and intension, was prepared by mini-pellet sintering integrated with H2 direct reduction. Static state experiment has been carried on to investigate the Cd(2+) removal efficiency from wastewater by the NSIS and to explore the Cd(2+) removal reaction kinetics. It was suggested that initial pH value and Cd(2+) original concentration had significant influence on Cd(2+) removal percentage. Cd(2+) removal percentage decreased significantly with the increasing of Cd(2+)original concentration whether the original pH value be adjusted to 3.0 or without adjustment. The results showed that the Cd(2+) removal process followed the first order reaction because the reaction order was from 0.803 to 0.996. The apparent reaction rate constant between Cd(2+) and NSIS was from 0.0025 to 0.1000 (mg·L(-1))(1-n)·min(-1). Compared with SIS reduced by charcoal reduction, NSIS deoxided by hydrogen possessed higher activity, and could remove the same quantity of Cd(2+) within a shorter period of time.
authors.affiliation: School of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, China.
authors.forename: Junguo
authors.initials: J
authors.lastname: Li
authors.forename: Linghong
authors.initials: L
authors.lastname: Wei
authors.forename: Yungang
authors.initials: Y
authors.lastname: Li
authors.forename: Na
authors.initials: N
authors.lastname: Bi
authors.forename: Fangfang
authors.initials: F
authors.lastname: Song
mesh_terms: D000818:Animals; D002104:Cadmium / Q000302:isolation & purification*; D006859:Hydrogen / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D011161:Porifera / Q000737:chemistry*; D012996:Solutions; D013223:Statistics as Topic; D013997:Time Factors; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002104:Cadmium; D006859:Hydrogen; D007501:Iron; D012996:Solutions; D062065:Wastewater