Citation: LIU Wan-Yi, WANG Tian-Ye, WANG Cheng-Yi, BI Cheng-Cheng, LIU Miao, YU Han. Study of Adsorption Performance of Cationic Dyes Methylene Blue and Malachite Green by Poly (Acrylate-co-Acrylamide) Hydrogel[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(11): 1785-1793. doi: 10.19756/j.issn.0253-3820.191255 shu

Study of Adsorption Performance of Cationic Dyes Methylene Blue and Malachite Green by Poly (Acrylate-co-Acrylamide) Hydrogel

1.
College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China;
2.
College of Environmental Science and Engineering, Peking University, Beijing 100871, China;
3.
Yanji Customs Inspection and Quarantine Comprehensive Technical Service Center, Yanji 133000, China;
4.
Key Laboratory of Groundwater Resource and Environment, Ministry of Education, College of New Energy and Environment, Jilin University, Changchun 130012, China;
5.
Faculty of Agronomy, Jilin Agricultural University, Changchun 130118, China

Received Date: 5 May 2019
Revised Date: 2 June 2019

Fund Project: This work was supported by the Jilin Science and Technology Department (No. 20180520210JH) and the Initial Scientific Research Foundation of Jilin Agricultural University (No. 201726).

By using potassium persulfate as initiator, acrylate (AA) and acrylamide (AM) as monomers, P(AA-co-AM) hydrogel was prepared by aqueous polymerization. The polymerization conditions were optimized by orthogonal test. The P(AA-co-AM) hydrogel was characterized by SEM and FTIR, and the results indicated that the hydrogel had three-dimensional network structure and the carboxyl and acylamino residues could efficiently interact with methylene blue (MB) and malachite green (MG) to form chelates in aqueous solution. The effects of particle size, temperature, pH value and initial concentration of MB and MG on the adsorption performance were investigated. The adsorption isotherm and kinetic behavior of MB and MG on P(AA-co-AM) hydrogel were discussed. The results showed that the decrease of the particle size of the P(AA-co-AM) hydrogel, and the increase of pH value of heavy metal ions solution and adsorption temperature could be in favor of the adsorption of MG on P(AA-co-AM) hydrogel, whereas the lower adsorption temperature could positively influence the adsorption of MB. The adsorption kinetic followed the pseudo-second-order kinetic mode (R₂>0.990) and the intra-particle diffusion mode (R₃>0.804). The adsorption process was chemisorption. The adsorption isotherm fitted the Freundlich model (R_F>0.993), and the adsorption process was multi-molecular layer adsorption. The maximum adsorption amount of MB and MG on P(AA-co-AM) hydrogel were 602.7 and 575.0 mg/g, respectively. Under the optimal desorption conditions, the desorption rates of MB from P(AA-co-AM) hydrogel were 78.18%, 68.35% and 59.34% respectively for repeated three desorption cycles.
- Acrylate,
- Acrylamide,
- Hydrogel,
- Methylene blue,
- Malachite green,
- Adsorption behavior
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