Rapid removal of copper with magnetic poly-acrylic weak acid resin: Quantitative role of bead radius on ion exchange

• Published in: Journal of hazardous materials 2014-05, Vol.272, p.102-111
• Main Authors: Fu, Lichun, Shuang, Chendong, Liu, Fuqiang, Li, Aimin, Li, Yan, Zhou, Yang, Song, Haiou
• Format: Article
• Language: English
• Subjects: Acids - chemistry; Adsorption; Applied sciences; Bead radius; Cations; Chemical engineering; Copper; Copper - chemistry; Exact sciences and technology; General purification processes; Hydrogen-Ion Concentration; Ion Exchange; Ion Exchange Resins - chemistry; Kinetics; Magnetic weak acid resin; Magnetics; Pollution; Rapid removal; Regeneration; Sodium - chemistry; Temperature; Thermodynamics; Wastewaters; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry; Water Purification; Water treatment and pollution
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2014.02.047

•The equilibrium adsorption amount of Cu2+ onto NDMC was 267.2mg/g.•Initial adsorption rate of NDMC was 4 and 8 times that of C106 and IRC-748.•External surface area was determined to be the key factor in rate-controlling.•Adsorption amount onto NDMC was not influenced by Na+ concentration.•0.01mM HCl solution could effectively desorb Cu2+. A novel magnetic weak acid resin NDMC was self-synthesized for the removal of Cu2+ from aqueous solutions. NDMC showed superior properties on the removal of Cu2+ compared to commercial resins C106 and IRC-748, which was deeply investigated by adsorption isotherms and kinetic tests. The equilibrium adsorption amount of Cu2+ onto NDMC (267.2mg/g) was almost twice as large as that onto IRC-748 (120.0mg/g). The adsorption kinetics of Cu2+ onto the three resins fitted well with the pseudo-second-order equation. The initial adsorption rate h of NDMC was about 4 times that of C106 and nearly 8 times that of IRC-748 at the initial concentration of 500mg/L. External surface area was determined to be the key factor in rate-controlling by further analyzing the adsorption thermodynamics, kinetics parameters and physicochemical properties of the resins. NDMC resin with the smallest bead radius possessed the largest external surface and therefore exhibited the fastest kinetics. The adsorption amount of Cu2+ onto NDMC was not influenced as the concentration of Na+ increased from 1.0 to 10.0mM/L. Dilute HCl solution could effectively desorb Cu2+. NDMC demonstrated high stability during 10 adsorption/desorption cycles, showing great potential in the rapid removal of Cu2+ from wastewater.