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Article

Cu(II) and As(V) Adsorption Kinetic Characteristic of the Multifunctional Amino Groups in Chitosan

Department of Civil Engineering, Sangmyung University, Cheonan 31066, Korea
Processes 2020, 8(9), 1194; https://doi.org/10.3390/pr8091194
Received: 29 July 2020 / Revised: 18 September 2020 / Accepted: 19 September 2020 / Published: 21 September 2020
(This article belongs to the Special Issue Various Adsorbents for Water Purification Processes)
Amino groups in the chitosan polymer play as a functional group for the removal of cations and anions depending on the degree of protonation, which is determined by the solution pH. A hydrogel beadlike porous adsorbent was used to investigate the functions and adsorption mechanism of the amino groups by removal of Cu(II) as a cation and As(V) as an anion for a single and mixed solution. The uptakes of Cu(II) and As(V) were 5.2 and 5.6 μmol/g for the single solution and 5.9 and 3.6 μmol/g for the mixed solution, respectively. The increased total capacity in the presence of both the cation and anion indicated that the amino group (NH2 or NH3+) species was directly associated for adsorption. The application of a pseudo second-order (PSO) kinetic model was more suitable and resulted in an accurate correlation coefficient (R2) compared with the pseudo first-order (PFO) kinetic model for all experimental conditions. Due to poor linearization of the PFO reaction model, we attempted to divide it into two sections to improve the accuracy. Regardless of the model equation, the order of the rate constant was in the order of As(V)-single > Cu(II)-single > As(V)-mixed > Cu(II)-mixed. Also, the corresponding single solution and As(V) showed a higher adsorption rate. According to intraparticle and film diffusion applications displaying two linear lines and none passing through zero, the rate controlling step in the chitosan hydrogel bead was determined by both intraparticle and film diffusion. View Full-Text
Keywords: adsorption; amino group; kinetic; multifunction; cation; anion adsorption; amino group; kinetic; multifunction; cation; anion
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MDPI and ACS Style

An, B. Cu(II) and As(V) Adsorption Kinetic Characteristic of the Multifunctional Amino Groups in Chitosan. Processes 2020, 8, 1194. https://doi.org/10.3390/pr8091194

AMA Style

An B. Cu(II) and As(V) Adsorption Kinetic Characteristic of the Multifunctional Amino Groups in Chitosan. Processes. 2020; 8(9):1194. https://doi.org/10.3390/pr8091194

Chicago/Turabian Style

An, Byungryul. 2020. "Cu(II) and As(V) Adsorption Kinetic Characteristic of the Multifunctional Amino Groups in Chitosan" Processes 8, no. 9: 1194. https://doi.org/10.3390/pr8091194

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