Studies of Zn(II) Ions Adsorption By Rice Husks Digested With Nitric Acid
Rice husks are one of the agro residues which are available from mills in relatively dry form. It is a carbonaceous material and abundantly available especially in Malaysia. Therefore it is an innovative step to convert this abundantly renewable source into fully utilization. This particular rese...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Year Project |
| Language: | English |
| Published: |
Universiti Teknologi Petronas
2005
|
| Subjects: | |
| Online Access: | http://utpedia.utp.edu.my/8175/1/2005%20Bachelor%20-%20Studies%20On%20Zn%20%28II%29%20Ion%20Adsorption%20By%20Rice%20Husks%20Digested%20With%20Nitric%20Acid.pdf http://utpedia.utp.edu.my/8175/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Rice husks are one of the agro residues which are available from mills in relatively dry
form. It is a carbonaceous material and abundantly available especially in Malaysia.
Therefore it is an innovative step to convert this abundantly renewable source into fully
utilization. This particular research studies will demonstrate the adsorption capacity of
Zn(II) ions in solution using activated carbon produced from rice husk. The adsorption
capacity of activated carbon is not only determined by their physical or porous structure
but also strongly influenced by the chemical structure of their surface. The usage of
nitric acid is imposed to oxidize the rice husk hence extended its surface acidity. Surface
acidity is categorized as the chemical structure that influences the carbon interaction
with polar and non-polar adsorbates, which is, in this case is Zn(II) ion. Specifically,
there are two main experiment to be conducted prior to the research studies which are;
formation of activated carbon under the various experimental condition and the
analytical studies of the adsorption capacity using Atomic Absorption
Spectrophotometer (AAS). Carbons which have equal surface area but prepared by
different methods or given different activation treatments show markedly different
adsorption characteristics. This particular research project will demonstrate the effect of
three variations of experimental conditions which are; weight ratio of Nitric acid to rice
husks, shaker speed and contact time and finally carbonization time. From the
experiment, it was found that the maximum yield of activated carbon was obtained from
rice husks subjected to acid digestion of weight ratio of 2, carbonization period of 0.5
hours and final heat temperature of 500°C. As for the adsorption properties, the rice
husks subjected to treatment at the weight ratio of 2, carbonization period of 3 hours and
temperature of 500°C displayed the best adsorption tendencytowards Zn(II) ions. |
|---|