Four kinds of hydrogels were synthesized by free radical polymerization with different proportions of carboxymethyl cellulose sodium (CMC) and acrylamide (AM) as raw materials,N,N-methylene bis acrylamide (MBA) as crosslinking agent and sodium persulfate as initiator.They were named CMC1-AM,CMC2-AM,CMC3-AM and CMC4-AM respectively.The effects of sorbent content,pH,temperature and salinity on the Pb2+ adsorption of the hydrogel were investigated.The results showed that CMC4-AM hydrogel had the best adsorption effect on Pb2+.When the initial Pb2+ concentration was 50mg/L,the adsorbent content was 1.5g/L,the temperature was 25℃,pH=7,without salt,the removal rate of Pb2+ was the highest,which could reach 89.6%.The maximum adsorption capacity of CMC4-AM hydrogel was 53.2mg/g,and the adsorption process accorded with the quasi two level kinetic model and the Langmuir adsorption isothermal model.The adsorption process was controlled by chemisorption of monolayer adsorption.
Wang Weibin, Liu Dongfang, Feng Demao, Liu Zhenbo, Li Songrong
. Study on preparation of cellulose hydrogel and its adsorption property for Pb2+[J]. New Chemical Materials, 2021
, 49(5)
: 195
-199
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.05.044
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