Assessment of Cu (II)-Bearing Montmorillonite on Cd Adsorption |
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Authors: | D Y Yu W H Song B Zhou W F Li |
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Institution: | (1) Animal Science College, Zhejiang University (Hua Jia Chi Campus), Hangzhou, 310029, People’s Republic of China;(2) The Key Laboratory of Molecular Animal Nutrition, Ministry of Education, No. 164, Qiutao North Road, Hangzhou, 310029, People’s Republic of China |
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Abstract: | The abilities of montmorillonite (MMT) and Cu (II)-bearing montmorillonite (Cu-MMT) for adsorption of Cd from aqueous solutions
have been studied at different optimized conditions of shaking time, pH value, and initial concentration, respectively. The
results showed that the adsorbability of Cu-MMT onto Cd is stronger than the MMT. The amount of Cu-MMT necessary to remove
Cd from solution was about 0.5 g for 100–200 mg/L Cd solution at a pH of 4.0. The maximum adsorption (94%) was 20 min of shaking
time using Cu-MMT as adsorbent. The maximum adsorption of Cd = 95% at a pH of 4.0. By increasing the initial concentration,
the adsorption amount of Cd onto Cu-MMT increased. Animal experiment of this study indicated that the addition of Cu-MMT to
the Cd-contaminated diet of pigs reduced significantly the Cd levels in tissues (p < 0.05) and increased contents in feces (p < 0.01), improving the safety of animal products. Thus, the overall results established the use of Cu-MMT as a heavy metal
adsorbent in animal’s diets, implying a potential protective role against heavy metal toxicities. |
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Keywords: | Montmorillonite Cu (II)-bearing montmorillonite Cadmium Adsorption Pig |
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