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Adsorption complexation of some amino acids with Cu(II) ion
on carbon nanotube
Mehdi Vadi , Mozhgan Jafary, Mohammad Ali Gorgin, Frank Poladiyan:Islamic
Azad University Firouzabad Branch,Firouzabad, Iran
In this experiment, adsorption of L-alanine , L-asparagine , L- cysteine , L- histidine ,
L- methionine , L- clycine, L-valine , L-treonine and their complexation with copper
(II) nitrate , tri- hydrate upon Multi – wall type carbon nanotube (CNT) to be
measured with ultraviolet- visible spectroscopy (UV/Vis) method. After we prepare
the molar solutions of complexation of this amino acids with Cu(NO3)2.3H20 we
added them to 0.01 gr. CNT. Then, after 24 hours agitation with mechanical stirrer in
room temperature, we filtered it with paper filter. Next, we measured adsorption of
filtrate solutions with ( IS Lambda 5 ) spectrophotometer. Finally, we calculated gram
adsorbed complex on 100 gr. CNT. The maximum gram adsorbed complex was found
to be L- cysteine complex equal 2.62 in Max = 229.6 and then, L-asparagines
complex equal 1.31in Max = 226.4 .
In L-cysteine the sulfur atom binds readily to heavy metal ions. The electron donating
–SH group increase the resonance effect due to the acids effect decrease so it has
more adsorption on CNT,and then L-asparagine is one of the principal and most
abundant amino acids involved in the transport of nitrogen. It has two amide groups
with electron donating effect due to them increase the resonance and base effect so it
has more adsorption on CNT too. L-asparagine has carboxamide as the side chains
functional group that it can form hydrogen bond interactions. More over, the distances
of the two c=o bonds are significantly different due to different hydrogen bond
environments. The conformation of the side chain is Trans, which distinguishes it
significantly from that of the amino acid monohydrates.
Keywords: Adsorption; Amino acid; Complexation; Cu(II) ion; Carbon nanotube
‫متیونین و‬-‫هیستیدین و ال‬-‫ ال‬. ‫ سیستئن‬-‫آسپارژین و ال‬-‫ آالنین و ال‬-‫در این آ زمایش جذب اسید های آ مینه ال‬
‫) مس سه آبه روی کربن نوع چند دیواره با‬п(‫ ترئونین و کمپلکس انها با نیترات‬-‫ والین و ال‬-‫ گالیسین ال‬-‫ال‬
‫ بعد از آماده سازی محلولهای موالر از‬.‫ مرئی اندازه گیری شده است‬-‫روش اسپکتروسکوپی ماوراء بنفش‬
‫ گرم کربن نانو تیوب اضافه کرده و‬0.01 ‫ ما انها را به‬Cu(NO3)2.3H20 ‫کمپلکسهای این اسیدهای امینه با‬
‫ ساعت به هم زدن با برهمزننده مکانیکی در دمای اتاق ما مخلوط را با کاغذ صافی صاف‬24 ‫سپس بعد از‬
.‫ (اندازه گیری شد‬IS Lambda 5 ) ‫ سپس جذب محلول زیر صافی با دستگاه اسپکتروفتومتر مدل‬.‫کردیم‬
‫سرانجام گرم کمپلکس جذب شده روی ‪ 100‬گرم کربن نانو تیوب محاسبه شد‪ .‬بیشترین گرم کمپلکس جذب شده‬
‫برای ال‪ -‬سیستئین برابر ‪ 2.62‬در ‪ Max= 229.6‬و بعد برای ال‪ -‬آسپارژین برابر ‪1.31‬در ‪Max = 226.4‬‬
‫پیدا شده است‪.‬‬
L-Asparagine structure
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