Abstract:
Peanut shells lignocellulose/
β-cyclodextrin/acrylic acid composite hydrogel (PS(H)/
β-CD/PAA) was prepared by free radical polymerization, using peanut shells(PS) and acrylic acid(AA) as polymerization monomers, potassium persulfate(APS) as initiator, N,N-methylenebisacrylamide(MBA) as crosslinking agent,
β-cyclodextrin(
β-CD) as reinforcing material. The surface properties and size morphology of the composite hydrogel adsorbent were characterized. The adsorption behavior and mechanism of PS(H)/
β-CD/PAA on Cd
2+ and Pb
2+ under different environmental factors were investigated. As a result, PS(H)/
β-CD/PAA had a porous network structure and positive mechanical properties when
β-CD was added. PS(H)/
β-CD/PAA presented lower synthesis cost and recyclability. The adsorption of PS(H)/
β-CD/PAA on Cd
2+ and Pb
2+ reached adsorption equilibrium within 60 min and worked effectively in a wide pH range of 3-8. The maximum adsorption capacity of PS(H)/
β-CD/PAA composite hydrogel for Cd
2+ and Pb
2+ was 115.67 and 181.71 mg/g, respectively. The adsorption process of PS(H)/
β-CD/PAA on Cd
2+ and Pb
2+ was mainly carried out through ion exchange, complexation or coordination interaction. In addition, when treating actual wastewater, the removal efficiency of PS(H)/
β-CD/PAA on Pb, Cd
2+, Cu
2+ and Ni
2+ was 76.4%, 88.6%, 72.9% and 31.6%, respectively. In a word, PS(H)/
β-CD/PAA exhibited good effectiveness in treating heavy metals in water, took full advantage of resources and saved costs, and could serve as a potential new material for heavy metal wastewater treatment.
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