This report is based on the investigation of the effect of temperature on the removal of Pb 2+ and Cd 2+ in aqueous effluent using C. bicolor biomass in a batch sorption process. The result showed that the most suitable sorption temperature was 40ºC with maximum sorption capacities of 49.02 mg/g and 52.63 mg/g for Pb 2+ and Cd 2+ respectively. Various thermodynamic parameters, such as ∆G o , ∆H o , ∆S o and E a have been calculated. The data showed that the sorption process is spontaneous and exothermic in nature and that lower solution temperatures favours metal ion removal by the biomass. The findings of this investigation suggest that physical sorption plays a role in controlling the sorption rate. The sticking probability model was further employed to assess the applicability of the C. bicolor biomass as an alternative adsorbent for metal ion contaminants in aqueous system.
Environmental protection requires the use of natural products instead of chemicals to minimize pollution. This investigation studies the use of a non-useful plant material as naturally occurring biosorbents for the removal of cationic pollutants in wastewater. . Surface characterization of acid and base treated C. bicolor biomass indicates a physiosorption as the predominant mechanism for the sorption process. The thermodynamic assessment of the metal ion -Caladium bicolor biomass system indicates the feasibility and spontaneous nature of the process.
Due to the increasing environmental concern regarding heavy metal contamination, there has been an abundance of interest in the removal of heavy metals from contaminated waste streams. Techniques presently in existence for removal of heavy metals from wastewater are relatively expensive involving either elaborate and costly equipment or high costs of operation with ultimate disposal problems (Cheng-Shlun and Shang-Da, 1994). In view of these reasons, development of a more cost effective remediation process using biological system for removal of heavy metal ions from wastewater is necessary. Biomaterials previously investigated include sago waste (Quek et al. 1998), Cyanidium caldarium (Lucido et al. 1991), sunflower (Sun andWeixing, 1998), Spagnum peat moss (GardeaTorresdey et al. 1996), cassava waste (Horsfall et al. 2003), Fluted pumpkin waste (Horsfall and Spiff, 2005a) and Caladium bicolor (Horsfall and Spiff, 2005b) for the removal of metal ions from aqueous solutions, just to mention a few. However, the necessity of investigating more biomaterials is still important in order to obtain the best biomaterial for industrial application.Therefore, the aim of this project is to assess the potential ability of Nipah palm shoot biomass as adsorbent for the removal of metal ions from aqueous solutions. In this paper we report the sorption kinetics of Pb 2+ and Cu 2+ on unmodified and mercaptoacetic acid (MAA) modified biomass of Nipah palm (Nypa fruticans Wurmb) shoot.
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