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Adsorption of Microcystin‐LR from Water with Iron Oxide Nanoparticles
Author(s) -
Gao Yuqiong,
Gao Naiyun,
Deng Yang,
Gu Jinshan,
Shen Yichen,
Wang Shaoxiang
Publication year - 2012
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13373575830674
Subject(s) - adsorption , microcystin , water treatment , iron oxide nanoparticles , chemistry , contaminated water , environmental chemistry , nanoparticle , iron oxide , portable water purification , environmental science , environmental engineering , nanotechnology , materials science , cyanobacteria , biology , organic chemistry , bacteria , genetics
Adsorption of microcystin‐LR (MC‐LR) from water using iron oxide (α‐Fe 2 O 3 ) nanoparticles was investigated in this study. Adsorption of MC‐LR adsorption was well‐described by a pseudo second order kinetics model and Freundlich and Langmuir isotherm equations at 15 to 35 °C. Thermodynamic analysis showed that the Gibbs free energy was negative, whereas standard enthalpy and entropy changes were positive at this temperature range. These findings suggest that the adsorption of MC‐LR on iron oxide nanoparticles was spontaneous and endothermic. The effects of initial pH, inorganic cations, and competing compounds with carboxyl groups on absorption of MC‐LR were also evaluated. Typically, adsorption efficiency decreased with increasing pH from 2 to 11. Sodium ions did not appear to significantly affect MC‐LR adsorption, whereas calcium ions slightly enhanced the MC‐LR adsorption capacity of the iron oxide nanoparticles. Moreover, the inhibiting effect of competing organic compounds was increased with increasing numbers of carboxyl groups, as follows: citric acid (3) > oxalic acid (2) > benzoic acid (1).