Preparation of peanut shell composite hydrogel and its adsorption properties of lead and cadmium
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 Cd2+and Pb2+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 Cd2+and Pb2+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 Cd2+and Pb2+was 115.67 and 181.71 mg/g,respectively.The adsorption process of PS(H)/β-CD/PAA on Cd2+and Pb2+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,Cd2+,Cu2+and Ni2+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.
NETL
NSTL
万方数据
