Biosorption of Pb2+ with Modified Soybean Hulls as Absorbent
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Biosorption of Pb2+ with Modified Soybean Hulls as Absorbent
Biosorption of Pb2+ with Modified Soybean Hulls as Absorbent
中国化学工程学报(英文版)2011年19卷第2期 页码:334-339
Affiliations:
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology,Beijing,China,100029
Author bio:
Funds:
Supported by the National Natural Science Foundation of China(20876008,21076009);the National Basic Research Program of China(2007CB714305);the National High Technology Research and Development Program of China(2006AA020101);Chinese Universities Scientific Fund(ZZ1024)
Using soybean hull residue after the soluble dietary fiber being removed during the soybean processing industry as crude material
a novel absorbent
modified soybean hulls
is prepared.Its adsorption behavior for Pb
2+
is studied.The adsorbent has a large and efficient adsorption capacity for Pb
2+
up to 20% of the mass of dry ad-sorbent.Its maximum adsorption capacity for Pb
2+
reaches 217 mg·g
-1
at initial Pb
2+
concentration of 2000 mg·L
-1
which is twice that of yeast absorbent and threefold greater than that of chitosan absorbent.The adsorption ability is sensitive to pH value in the solution and the optimal pH for adsorption of Pb
2+
is 7.0.In the presence of other metal ions (Ca
2+
Mg
2+
and Na
+
) in the solution
their effect on the adsorption capacity for Pb
2+
is not obvious.After 5 cycles of adsorption
80% adsorption capacity of Pb
2+
is maintained.Compared with various available commercial resins
the modified soybean hulls are a plentiful
inexpensive and effective medium for the capture of dissolved Pb
2+
from waste streams.
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