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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(3) [May 2005] >
| Title: | Utilization of a biosorbent based on Azadirachta indica (Neem) leaves for removal of water-soluble dyes |
| Authors: | Sharma, Arunima
Bhattacharyya, Krishna G |
| Keywords: | Biosorbent
neem leaf powder (NLP)
Water soluble dyes
brilliant green
congo red
methylene blue
Azadirachta indica |
| Issue Date: | May-2005 |
| Publisher: | CSIR |
| IPC Code: | C09B61/00 |
| Abstract: | A biosorbent is developed from Azadirachta
indica (Neem) leaves in the form of a finely ground dried powder (53–74  ). The powder was used to remove three water-soluble dyes, viz., brilliant green, congo red and methylene
blue from aqueous medium. The adsorptive interactions were tested under varying
conditions of concentration of the dyes, amount of adsorbent, pH, and
temperature. It was found that 670, 1000 and 2000 mg respectively of the powder
could remove almost 100 % of the dyes from 1 L of water containing 10, 20 and
25 mg of brilliant green, congo red and methylene blue dyes, respectively. The
interactions followed pseudo first order kinetics. The Langmuir monolayer
adsorption capacity had values of 133.69, 72.38 and 8.76 g kg-1 for
brilliant green, congo red and methylene blue. The adsorption of brilliant
green and methylene blue on neem leaf powder (NLP) was endothermic with mean ΔH values of 12.12 and 9.40 kJ mol-1
respectively while that of congo red was exothermic with mean ΔH value of –12.75 kJ mol-1. |
| Page(s): | 285-295 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(3) [May 2005]
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