Preparation
and charactersiation of low cost adsorbent from groundnut foliage by chemical
activation
D.
Vidhya Lakshmi, L. Anitha Jegadeeshwari, N. Arunodhaya, E. Vasanth Kumar and
N. Nagendra Gandhi*
Department of
Chemical Engineering, AC Tech Campus, Anna University, Chennai-600 025, India
*Corresponding
Author E-mail: nagendragandhi.n@gmail.com
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Key
words
Activated carbon
Agro based waste
Groundnut foliage
Isotherms
Low cost adsorbent
Publication Data
Paper received : 02.02.2017
Revised received : 24.06.2017
Re-revised received :
02.09.2017
Accepted : 13.09.2017
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Abstract
Aim: Effective
treatment and management of wastewater and solid waste are the major
challenges growing at an alarming rate in today's world. The aim of the
present study was to find the feasibility of utilizing agro-based waste
(groundnut foliage) as a low cost adsorbent for dye laden waste water treatment.
Methodology:
Groundnut
foliage was collected from different villages in Villupuram district, Tamil
nadu and was converted into an activated carbon by chemical activation
method. Activation was done with different activating conditions (activating
agents, impregnation ratio and activation temperature). Methylene blue number
and Iodine number for prepared activated carbon was determined using standard
procedure. The optimized activation condition for groundnut foliage activated
carbon was selected based on the yield (%), Methylene blue number and Iodine
number. Batch adsorption studies were done using methylene blue as adsorbate
to find the effects of adsorption parameters. Adsorption isotherm models like
Langmuir and Freundlich were used to analyse the suitability of equilibrium
data.
Results:
Activated
carbon was prepared using concentrated H3PO4 as activating agent with ratio
of 1:2 at 600șC has better percentage of yield (> 45%), Methylene blue
value (27 mg g-1) and Iodine value (1143 mg g-1) when
compared with activated carbon prepared using ZnCl2 and KOH as activating
agent. For 100 mg l-1 of methylene blue dye concentration and at 6
pH in 30oC, about 89% of methylene blue dye removal was adsorbed
with 0.25 g of groundnut foliage activated carbon. Adsorption followed the
Langmuir model.
Interpretation:
Low
cost adsorbent prepared using groundnut foliage (agro-based waste) has
desired properties of adsorbent and can be effectively used in dye laden
waste water treatment.
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