Abstract
Fe modified rice husk was prepared as a low cost biosorbent for the removal of Cr(VI) and phenol both singly and in combination from single and binary simulated synthetic waste water. Rice husk was modified by treating with FeSO4·7H2O. The results showed that impregnation of iron onto the surface of rice husk improved the adsorption capability of both Cr(VI) and phenol. The effects of process parameters for multicomponent system such as pH, adsorbent dose, and contact time onto the percentage removal of both Cr(VI) and phenol were investigated. The experimental data for the adsorption of both Cr(VI) and phenol onto the surface of Fe modified rice husk applied to various kinetic and adsorption isotherm models. Multicomponent isotherm models such as Nonmodified Langmuir, Modified Langmuir, Extended Langmuir, Extended Freundlich, Competitive Nonmodified Redlich Peterson, Competitive Modified Redlich Peterson were applied. The results show that Extended Freundlich model best described the experimental data for both Cr(VI) and phenol from binary solution. Pseudo second-order model agreed well with Cr(VI) while pseudo first-order model agreed well with phenol. Maximum adsorption capacity in synthetic binary solution of Cr(VI) and phenol was found to be 36.3817 mg g−1for Cr(VI) and 6.569 mg g−1for phenol, respectively.
Highlights
Heavy metals are often present with phenolic compounds in the environment which have adverse effects on living species including man [1]
The aim of this work is (i) to study the effect of process parameters such as pH, contact time, and adsorbent dose on the percentage removal of Cr(VI) and phenol from binary simulated synthetic solution and (ii) to determine the suitability of various single and multicomponent equilibrium isotherm models, and (iii) to determine the kinetics of adsorption of Cr(VI) and phenol onto the surface of Fe treated rice husk
The changes in percentage removal of Cr(VI) and phenol by adsorption on Fe treated rice husk due to change in pH are shown in Figure 4. pH reflects the nature of biosorption mechanism on the surface of biosorbent
Summary
Heavy metals are often present with phenolic compounds in the environment which have adverse effects on living species including man [1]. Precipitation/coagulation [2], chemical oxidation [3], biodegradation [4], adsorption [5], ion exchange [6], membrane processing [7], electrolytic methods [8], and so forth are some important methods which have been used to remove the heavy metal ion and phenolic contents together from the effluents of various industries such as leather tanning, electroplating, and alloying [5]. Much research has been carried out on the uptake of single pollutant; due to the fact that organic pollutants exist with metallic species, in the recent year simultaneous removal of phenol and Cr(VI) has gained a great attention in waste water treatment processes [1]. Biosorption is proved to be most promising technologies for the simultaneous removal of organic compound and heavy metal ions from waste water and an alternative to conventional or traditional methods such as precipitation, ion exchange, and catalytic reaction [10]. The biosorbent used for the removal of phenol are bentonite [24] and polymerized
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