Development of biochar and chitosan blend for heavy metals uptake from synthetic and industrial wastewater

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.

Research Progress On Comprehensive Utilization Of Fruit And Vegetable Waste

“…They can be used as high quality adsorbents for sewage treatment [28]. Scholars at home and abroad have found that biomass materials have strong adsorption capacity for heavy metal ions, methylene blue and so on, and the adsorption effect is better after modification [29][30][31]. Chen Yimin et al used solid waste produced by a freeze-dried fruit and vegetable production enterprise to treat wastewater containing hexavalent chromium ion, copper ion and methylene blue.…”

Biochar production technologies and wastewater treatment

“…Major pollutants involved here are acrolein, amines, mercaptans, dibutyl sulfide, hydrogen sulfide, phenolics compounds, ammonia, mercury, cyanide ,and so on [3] A biochar in combination with chitosan after cross linking can be introduced into membranes, beads and solution used as an effective adsorbent for heavy metals like copper, lead, arsenic, cadmium ,and many other heavy metals. [4] . Gliricidia biochar is material for crystal violet removal based on pH value, contact time and dosage.…”

Transport of micro/nano biochar in quartz sand modified by three different clay minerals

“…Once desorbed, heavy metals will migrate to farther places and cause large-scale pollution. So many scholars have analyzed and studied the phenomenon that 'colloid promotion' can accelerate the migration of pollutants (especially organic pollutants and heavy metals) in water or soil [7]. So far, among the main methods for removing and recovering heavy metals in water (chemical precipitation, redox, ion exchange, biological filtration, activated sludge method and adsorption), the adsorption method has the advantages of good purification effect, simple operation, and no secondary pollution.…”