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Citric Acid Enhanced Copper Removal by a Novel Multi-amines Decorated Resin.

ABSTRACT: Cu removal by a novel multi-amines decorated resin (PAMD) from wastewater in the absence or presence of citric acid (CA) was examined. Adsorption capacity of Cu onto PAMD markedly increased by 186% to 5.07 mmol/g in the presence of CA, up to 7 times of that onto four commercial resins under the same conditions. Preloaded and kinetic studies demonstrated adsorption of [Cu-CA] complex instead of CA site-bridging and variations of adsorbate species were qualitatively illustrated. The interaction configuration was further studied with ESI-MS, FTIR, XPS and XANES characterizations. The large enhancement of Cu adsorption in Cu-CA bi-solutes systems was attributed to mechanism change from single-site to dual-sites interaction in which cationic or neutral Cu species (Cu(2+) and CuHL(0)) coordinated with neutral amine sites and anionic complex species (CuL(-) and Cu2L2(2-)) directly interacted with protonated amine sites via electrostatic attraction, and the ratio of the two interactions was approximately 0.5 for the equimolar bi-solutes system. Moreover, commonly coexisting ions in wastewaters had no obvious effect on the superior performance of PAMD. Also, Cu and CA could be recovered completely with HCl. Therefore, PAMD has a great potential to efficiently remove heavy metal ions from wastewaters in the presence of organic acids.

SUBMITTER: Ling C

PROVIDER: S-EPMC4649996 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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Citric Acid Enhanced Copper Removal by a Novel Multi-amines Decorated Resin.

Ling Chen C Liu Fuqiang F Pei Zhiguo Z Zhang Xiaopeng X Wei Mengmeng M Zhang Yanhong Y Zheng Lirong L Zhang Jing J Li Aimin A Xing Baoshan B

Scientific reports 20150512

Cu removal by a novel multi-amines decorated resin (PAMD) from wastewater in the absence or presence of citric acid (CA) was examined. Adsorption capacity of Cu onto PAMD markedly increased by 186% to 5.07 mmol/g in the presence of CA, up to 7 times of that onto four commercial resins under the same conditions. Preloaded and kinetic studies demonstrated adsorption of [Cu-CA] complex instead of CA site-bridging and variations of adsorbate species were qualitatively illustrated. The interaction co ...[more]

PMID: 25962970

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Dataset Information

Citric Acid Enhanced Copper Removal by a Novel Multi-amines Decorated Resin.

Publications

Citric Acid Enhanced Copper Removal by a Novel Multi-amines Decorated Resin.

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