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Influence of Quaternary Ammonium on Sorption of Selected Metal Cations onto Clinoptilolite Zeolite

Zhaohui Li*,a, Daniel Alessia and Lori Allenb

a Chemistry Dep. and Geology Dep., Univ. of Wisconsin-Parkside, 900 Wood Road, Kenosha, WI 53141
b Chemistry Dep., Univ. of Wisconsin-Parkside, 900 Wood Road, Kenosha, WI 53141



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  		Fig. 1. Sorption of (a) Cs+, (b) Sr2+, (c) La3+, (d) Zn2+, and (e) Pb2+ on raw zeolite ({diamondsuit}), hexadecyltrimethylammonium (HDTMA)-treated zeolite to 25 ({blacksquare}), 50 ({blacktriangleup}), 75 (•), 100 ({diamond}), 150 ({square}), and 200 ({Delta})% surface coverage. The lines are Langmuir fits to the experimental data.

 


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  		Fig. 2. Sorption of hexadecyltrimethylammonium (HDTMA) and counterion bromide on zeolite preloaded with (a) Cs+, (b) Sr2+, (c) La3+, (d) Pb2+, and (e) Zn2+. The lines are Langmuir fits to the experimental data.

 


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  		Fig. 3. Sorption of dodecyltrimethylammonium (DDTMA) and counterion bromide on zeolite preloaded with (a) Cs+, (b) Sr2+, (c) La3+, (d) Pb2+, and (e) Zn2+. The lines are Langmuir fits to the experimental data.

 


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  		Fig. 4. Sorption of octyltrimethylammonium (OTMA) and counterion bromide on zeolite preloaded with (a) Cs+, (b) Sr2+, (c) La3+, (d) Pb2+, and (e) Zn2+. The lines are Langmuir fits to the experimental data.

 


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  		Fig. 5. Desorption of metal cations due to sorption of octyltrimethylammonium (OTMA) (a–d), dodecyltrimethylammonium (DDTMA) (e–h), and hexadecyltrimethylammonium (HDTMA) (i–l).

 




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