Abstract
Heavy metals are usually released into water bodies from industrial/domestic effluents such as metal plating industries, mining and tanneries. Adsorption is a fundamental process in the physiochemical treatment of wastewaters because of its low cost. Great efforts have been made to use the economically efficient and unconventional adsorbents to adsorb heavy metals from aqueous solutions, such as plant wastes and agricultural waste. Biochar mixed with chitosan after crosslinking can be casted into membranes, beads and solutions which can be effectively utilized as an adsorbent for metal ion uptake. Keeping these facts into consideration, the present study was undertaken with the objective to determine the effect of various proportions of biochar-modified chitosan membranes on the sorption characteristics of different heavy metals like Cu, Pb, As and Cd along with comparison of sorption characteristics between industrial waste water samples containing multi-metals and standard synthetic stock solution containing a particular metal. It is apparent from the results that the bioadsorbent prepared from biochar and chitosan are low-cost efficacious resource due to its easy availability. It is also eco-friendly material for making adsorbent for abstraction of heavy metals from aqueous solution. This adsorbent can be best utilized for adsorption of heavy metals.
Highlights
The pollution of surface and underground water has gradually increased and it is a worldwide concern for the last few decades due to disposal of wastes containing heavy metals
It is apparent from the results that the bioadsorbent prepared from biochar and chitosan are low-cost efficacious resource due to its easy availability
The adsorption studies were carried out using the chitosanmodified biochar membranes in synthetic stock solutions prepared to adsorb the desired heavy metals
Summary
The pollution of surface and underground water has gradually increased and it is a worldwide concern for the last few decades due to disposal of wastes containing heavy metals. Heavy metals are usually released into water bodies from industrial/domestic effluents such as metal plating industries, mining and tanneries. Heavy metals from polluted water bodies can diffuse into the surrounding soil, surface water and groundwater. When the polluted water is consumed by living organisms, the toxic heavy metals can accumulate and become harmful. The human health and ecological systems are threatened to get worse. Harmful heavy metals are abundant in the water bodies due to the rapid industrial development and wrong practices of agriculture, together with the pollution growth
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