Adsorptive Removal of Copper and Chromium Ion by Using Azospirillum Biofertilizer as Low-cost Biosorbent in Aqueous Medium
2022
Kulkarni, Kavita | Dhulipudi, Sivakrishna | Chendake, Yogesh | Kulkarni, Anand | Subrahmanyam, C. V.
Heavy metal contamination plays a major role in water pollution. It needs remediation without raising the issues of secondary waste generation and their related issues. Heavy metal residues adversely affect soil and water quality. Their leachate would disturb the whole ecological system. It needs remediation to avoid the effect on soil and water. Azospirillium biofertilizer has the ability to reduce hazardous components without disturbing the growth of the plant. Hence, the use of low-cost biosorbent was proposed for heavy metal removal. The investigations showed excellent removal of heavy metals like copper (Cu) and chromium (Cr) using Azospirillium biofertilizer. These materials showed efficient removal of Cu and Cr at 94% and 70%, respectively. Separation was dependent upon the interaction between sorbent and sorbate, which makes separation tunable for the removal of the desired material from effluent or other streams. Parameter optimization like temperature, adsorbent dose, time, pH, and agitation speed was studied for both metals. At optimum parameters, Langmuir capacity was found to be 35.71 mg/g and 5.58 mg/g of copper and chromium. Experimental data was best fitted to Langmuir isotherm, and the pseudo-second-order kinetic model was suitable for the study of both metals.
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