Sugarcane Bagasse and Corn Stalk Biomass as a Potential Sorbent for the Removal of Pb(II) and Cd(II) from Aqueous Solutions

Abstract

Heavy metal pollution in the water supply is a serious environmental problem that affects human health around the world. The goal of this study was to investigate the adsorption behaviour of sugarcane bagasse (SB) and corn stalk (CS) biomass for Pb(II) and Cd(II) removal from metal-contaminated water. When the doses of biomass were increased in solutions containing Pb(II) and Cd(II), the SB and CS showed a trend of increasing metal removal efficiency. The removal efficiency of biomass for Pb(II) decreased as the pH of the solution increased from 5.0 to 7.0, with an optimum pH range of 5 to 6. However, pH has little influence on the removal efficiency of biomass for Cd(II). Adsorption equilibrium is reached in about 15 min. Adsorption for at least four cycles improves Pb(II) removal efficiency (up to 98 %) in solutions containing only Pb(II). The best fitness of the adsorption isotherm to Freundlich suggests multilayer adsorption of metal ions onto CS. Higher qmax and Kf suggest that SB and CS have a greater affinity for Pb(II) than for Cd(II). Pb(II) adsorption potential was found in biomass derived from SB and CS, but it was less effective as a Cd(II) adsorbent. For application in environmental clean-up, we suggest further study on the structural modification of biomass to enhance its metal removal capacity, the regeneration of biomass for better results, and field trials for practical application. HIGHLIGHTS The adsorption behaviour of sugarcane bagasse and corn stalk biomass for Pb(II) and Cd(II) removal from metal-contaminated water was studied The removal efficiency of Pb(II) increases with increased doses of biomass and decreases with increased solution pH and metal initial concentrations Adsorption for at least four cycles improves metal removal efficiency in the case of Pb(II) Freundlich’s isotherm suggests multilayer adsorption of Pb(II) and Cd(II) onto corn stalk biomass Higher qmax and Kf values suggest that sugarcane bagasse and corn stalk have a higher affinity for Pb(II) than Cd(II)

The non-edible and disposable parts of oyster mushroom, as novel adsorbent for quantitative removal of atrazine and its degradation products from synthetic wastewater

“…It was known that the monolayer coverage of the sorbent surfaces was assumed using Langmuir isotherm model. In addition, interaction of the sorbent in the plane of the adsorbent surface should not be taken in to account [ 50 ]. The following mathematical relation gives the linear term of the Langmuir model [ 51 , 52 ].…”

“…The calculated values for the regression coefficient, r 2 , were found to be 0.09703, 0.9989, 0.9967 and 0.9998 for DIA DEA, ATOH and Atrazine, respectively, signifying that the adsorption process follow the pseudo-second order model. This assumption makes use of the fact that chemisorption is the rate determining step [ 50 ].…”

Nuevas tecnologías de adsorción y factores de influencia para iones Cd (II) y Pb (II) – una revisión

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Moss biomass as effective biosorbents for heavy metals in contaminated water

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