The ultrasound assisted chemical activation of peanut husk using phosphoric acid was studied at a frequency of 20 kHz. Experiments were carried out for the activation of peanut husk in presence of ultrasound followed by the study of consequent effect on the adsorption behavior of copper. Effect of sonication during chemical activation on copper adsorption was studied with respect to various parameters such phosphoric acid concentration, acid impregnation ratio, temperature, duty cycle, sonication time, power and the probe height dipped in the adsorbent-acid slurry. Results showed that after the application of ultrasound during the activation process, copper uptake capacity of the adsorbent is improved with increasing ultrasound power and the activation process is more feasible at 30°C. The copper uptake after activation treatment of 5 min in the presence of ultrasound was found to be 19.6 mg/g as against 17.8 mg/g by conventional chemical activation method performed for 20 min. Thus, after acid treatment in the presence of ultrasound, the adsorbent shows a good adsorption capacity at lower time of chemical activation.
Peanut husk, an agricultural waste is a precursor biomass veteran for chemical activation using phosphoric acid. The work deals with activation of peanut husk using phosphoric acid followed by its application. The effect of various parameters such as impregnation ratio, temperature, particle size and agitation speed on copper adsorption were also studied. Physical characterization of the activated adsorbent was done using SEM, BET and FTIR to understand the modifications. The optimum parameter values of chemical activation influencing adsorption were 20% phosphoric acid concentration, 1:8 acid impregnation ratio, 60 °C activation temperature and 350 rpm stirring speed. The copper uptake was 14.3 mg/g for peanut husk whereas by chemical activation it was increased to 17.88 mg/g. Thus adsorption capacity of peanut husk can be successfully improved using phosphoric acid activation.
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