Adsorption of cadmium ion from aqueous solutions by copper‑based metal organic framework: equilibrium modeling and kinetic studies.
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Date
2019-06-06
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Springer International Publishing
Abstract
In the present study, the adsorption behavior of copper-based metal organic framework (Cu-MOF) in the removal of cadmium
ion (
Cd2+) from aqueous solution was investigated. The Cu-MOF prepared by solvothermal method was characterized by
BET, FTIR, SEM and EDX techniques. Effect of adsorption parameters such as initial Cd2+
concentration (20–100 mg/L),
contact time (20–60 min) and adsorbent dosage (0.1–0.5 g) on the removal efficiency and equilibrium adsorption capacity
was investigated at fixed pH and temperature. The results obtained from the batch mode adsorption studies revealed that
at initial Cd2+
concentration of 20 mg/L, contact time of 60 min and adsorbent dosage of 0.5 g, the removal efficiency and
equilibrium adsorption capacity of Cd2+
from the process were 98.62% and 1.9724 mg/g, respectively. The experimental
data were evaluated by Langmuir and Freundlich isotherm models. The data fitted well with the Langmuir isotherm, and
monolayer adsorption capacity of the Cu-MOF was 219.05 mg/g. The kinetic data were analyzed by using pseudo-first-order,
pseudo-second-order and intraparticle diffusion models. The kinetic studies showed that pseudo-second-order model exhibited
high correlation coefficients for all the initial Cd2+
concentrations studied, thus indicating that the theoretical amount
of Cd2+
adsorbed agreed to the experimental values of Cd2+
adsorbed.
Description
Keywords
Adsorption, Cadmium, Copper, Metal organic framework, Kinetic model