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Study on the Effect of the Cr (VI)-containing Wastewater by Using Modified Bentonite

Author: YangZuo
Tutor: GuanWeiSheng
School: Chang'an University
Course: Environmental Engineering
Keywords: bentonite adsorption Na-modified bentonite roasting-modified bentonite organic-modified bentonite Cr (VI)-containing wastewater
CLC: X703
Type: Master's thesis
Year: 2008
Downloads: 171
Quote: 2
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Abstract


The matrix used in this study was the natural bentonite produced in Neimeng. The study determined the natural calcium-base bentonite’s basic physicochemical properties first. The result showed that its multiple of expansion and gluey valence are 8.4mL/g and 10.2mL/g, the content of Montmorillonite is 43.79%.The study adopt three modified methods, Na-modified, roasting-modified and organic-modified.The result showed that the best preparation condition of Na-modified bentonite is: the proportion of calcium-base bentonite and 4% Na2CO3 solution is 1:10, pH 9.0, 60℃,stir time 1.0 h, its multiple of expansion and gluey valence are 82.6L/g and 88.8mL/g.The best reaction temperature of roasting-modified bentonite is 450℃and the reaction time is 2h .The best preparation condition of organic-modified bentonite is: the proportion of Na-base bentonite and 5% CTMAB solution is 1:10, pH 4.0, 60℃,stir time 2.0 h.Study on the effect of the Cr (VI)-containing wastewater by using the three kinds of modified bentonite, it can be find that the adsorption rate was affected by pH, adsorption time, dosage of adsorbents and adsorption temperature. Under the best conditions of experiment, the adsorption rate of the Cr (VI) of Na-modified bentonite, roasting-modified bentonite and organic-modified bentonite are 86.1%、81.2% and 97.5%. After modifying, the nature bentonite can improve its adsorption ability greatly.By the end , the correlative mechanism also be discussed , the experiment result show that the Na-activated modification bentonite’absorption on the Cr (VI)-containing wastewater conforms to the Freundlich absorption isothermal equation more suitable, accordingly the Na-activated modification bentonite’absorption on the Cr (VI)-containing wastewater conforms to the Langmuir absorption isothermal equation more suitable.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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