MADRAS AGRICULTURAL JOURNAL

Removal of Lead and Cadmium from Aqueous Solutions by Banana Peel Biochar

Abstract

                                Heavy metals are ubiquitous environmental pollutants to influence on changing the different environmental compartments including air, water and soil. Due to the toxicity, persistence and bioavailability status, metal contamination is a serious issue for environment especially in terrestrial and aquatic systems. Biosorption of heavy metals is the physicochemical removal process of heavy ions or their compounds, from wastewater by using biosorbents. In this point of view, to remove lead and cadmium by eco-friendly manner banana peel biochar powder based biosorbents has been taken for the present investigation, and used Atomic Adsorption Spectrophotometer for metal estimation. Different electrochemical and biochemical characterizations such as pH, EC, CEC, particle size, zeta potential, organic carbon, crude protein, moisture content, dry matter, ash content and elemental composition of banana peel biochar was analyzed through standard methods. The SEM images determined that banana peel biochar contain irregular porous surface area, and also the FTIR peaks showed that banana peel biochar has C-H, =CHand C-Cl functional groups which has important role in adsorption of metals. The batch experiment was conducted to the effect of pH, metal ion concentration and contact time. The highest adsorption of Pb (83.45%) and Cd (89.87%) was observed at pH 7 and 75 ppm concentration, and the maximum adsorption of both elements recorded at 6 hours contact time. The banana peel biochar has high capacity of heavy metals adsorption from wastewater such as Pb (II) and Cd (II), but the adsorption efficiency of Cd was higher than Pb.

Key words : Lead, Cadmium, pH, Absorption - Banana peel biochar

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

MADRAS AGRICULTURAL JOURNAL

Biosorption of Chromium (III) from Aqueous Solution by Water Hyacinth Biomass

Abstract

                                Release of heavy metals into the environment is a matter of global concern for the past few years and it should be removed from industrial waste waters before discharge for maintaining water quality standards. This study involved the use of water hyacinth biomass as biosorbent for removal of Cr(III) from aqueous solution. The biosorbent was characterized by FTIR, SEM with EDAX. Batch experiments were conducted to determine the sorption isotherms, effect of solution pH, adsorbate concentration, contact time, biosorbent dosage and size. The results confirmed that water hyacinth biomass can remove Cr(III) from aqueous solution. The maximum sorption occurs at pH =5.0, biosorbent size= 0.2mm, biosorbent dosage=2.0g 100ml-1 of adsorbate, adsorbate / solute concentration= 100 mg L-1 Cr(III) at 25ºC at 250 rpm after 24 hrs. The rate of adsorption was rapid and equilibrium attained at 24hrs. Langmuir, Freundlich and Temkin isotherm models were used to analyze the equilibrium adsorption data. Langmuir isotherm fitted the data well with R2 value of 0.999. Overall, the powdered water hyacinth biomass could be utilized as effective low cost adsorbent for the removal of Cr(III) from waste water.

Key words : Adsorption, Cr Removal, Release kinetics, Water hyacinth

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

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    Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.