Biosorption of Cr(VI) and Cu(II) by Palm Kernel Powder and Its Potential Application

Abstract

Abstract-In this research, palm kernel powder (PKP) was utilized as a bioadsorbent for the removal of Cr(VI) and Cu(II) ions from aqueous solutions. Batch studies were preformed to evaluate the effect of various experimental parameters on Cr(VI) and Cu(II) adsorption onto PKP. The adsorption equilibrium was reached after 70 min. The adsorption capacity of Cr(VI) and Cu(II) was pH-dependent showing a maximum at equilibrium pH 2 and 5, respectively. The percentage removal of heavy metals by PKP varied in order unmodified adsorbents>HNO3>H3PO4. The adsorption isotherm and kinetics of Cr(VI) and Cu(II) were also investigated using Langmuir and Freundlich adsorption isotherm models and pseudo-first order (LSO) and pseudo-second-order (PSO) kinetic models. The data was better described by Freundlich adsorption isotherm model and PSO kinetics in the concentration range studied. For environmental study, it was found that the adsorption capacity for heavy metals decreased in the raw waste water sample in comparison with the synthetic waste water system.

Phytomanagement of a chromium-contaminated soil by a high-value plant: Phytostabilization of heavy metal contaminated site

“…Based on the total Cr concentration and alkaline extraction, Cr(VI) accounted for at least 4.7% to 19.0% of the total soil Cr, while Cr(III) accounted for 81.0% to 95.3%, from the beginning to the end of the cultivation period, assuming that all the Cr(VI) was extracted by the alkaline digestion (James et al 1995). It was noted that CrO4 2and HCrO4were the substantial species in Cr(VI) aqueous solutions and that the relative distribution of each varied with pH, with CrO4 2 being the dominant species in alkaline environments, thereby decreasing the diffusion of chromate ions in the soil environment due to the competitive adsorption between OHions and oxyanions of chromium (Sengupta et al 1986;Mohamed et al 2016). One reason for the decreased Cr(VI) concentration in the cultured soils (Fig.…”

Effect of Physical and Chemical Preparation on Characteristics of Activated Carbon from Agriculture Solid Waste and their Potential Application

“…The mixture was stirred for 2 hrs at room temperature and then filtered through Whatman No. 1 filter paper [11]. The residual concentration of Ni(II) ions in the (1)…”