Activated Arachis hypogea With Enhanced Multi Metal Sorption Capacity from Synthetic and Electroplating Industrial Wastewater: Batch and Column Mode

Joginder Singh, Amjad Ali, Avnish Kumar Arora, Mayank Kinger, Vivek Sheel Jaswal

Abstract


Activated Arachis hypogea shell powder was employed for
desalinating Cr (VI), Cu (II) and Ni (II) from synthetic and
electroplating industrial wastewater. The effects of pH,
contact time, adsorbent dose, initial metal ion
concentration and temperature on the biosorption was
studied in batch mode. Freundlich and Langmuir isotherm
models were applied to study the batch equilibrium data
and the best fitting was observed with Langmuir isotherm
model. The maximum biosorption capacity for Cr (VI), Cu
(II) and Ni (II) was found to be 131.57, 128.20 and 129.87
-1 + + mg g at pH 2.0, 5.0, 6.0 respectively. The release of Na , K , 2+ 2+ Mg and Ca from the unactivated Activated Arachis
hypogea shell powder supported ion exchange as the
foremost mechanism of biosorption. Column studies were
carried out at specific pH, flow rate and varying bed depth
using the electroplating industrial wastewater. The metal
uptake capacity and volume of water treated was found to
be maximum with bed depth of 20.0 cm and flow rate of 0.5
-1 mL min in all three columns. This study revealed that
activated Arachis hypogea shell powder is an excellent
biosorbent for desalinating heavy metal ions from industrial
wastewater and can be used at commercial level.

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