Comparison on the Surface Structure Properties along with Fe(II) and Mn(II) Removal Characteristics of Rice Husk Ash, Inactive Saccharomyces cerevisiae Powder, and Rice Husk.

Zhao Jiang,Xiuyuan Zhang,Yan Lu,Bo Cao,Jiaying Zhao,Ziyi Wang,Guangxia Su,Ying Zhang,Dexin Shan

doi:10.1155/2016/7183951

Zhao Jiang, Xiuyuan Zhang + Show 7 more

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https://doi.org/10.1155/2016/7183951

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Abstract

This study selected solid wastes, such as rice husk ash (RHA), inactive Saccharomyces cerevisiae powder (ISP), and rice husk (RH), as the potential adsorbents for the removal of Fe(II) and Mn(II) in aqueous solution. The structural characteristics, functional groups, and elemental compositions were determined by scanning electron microscope (SEM) and Fourier translation infrared spectrum (FT-IR) analyses, respectively. Then the influence on the Fe(II) and Mn(II) removing efficiency by the factors, such as pH, adsorbent dosage, initial Fe(II) and Mn(II) concentration, and contact time, was investigated by the static batch test. The adsorption isotherm study results show that Langmuir equation can better fit the Fe(II) and Mn(II) adsorption process by the three adsorbents. The maximum adsorption amounts for Fe(II) were 6.211 mg/g, 4.464 mg/g, and 4.049 mg/g by RHA, ISP, and RH and for Mn(II) were 3.016 mg/g, 2.229 mg/g, and 1.889 mg/g, respectively. The adsorption kinetics results show that the pseudo-second-order kinetic model can better fit the Fe(II) and Mn(II) adsorption process. D-R model and thermodynamic parameters hint that the adsorption processes of Fe(II) and Mn(II) on the three adsorbents took place physically and the processes were feasible, spontaneous, and exothermic.

Highlights

At present, a lot of effective separation technologies are used to remove heavy metals from aqueous solutions
More interests have arisen in the investigation of adsorbents with a good sorption capacity to remove heavy metal ions from wastewater [4, 5], many low-cost agricultural wastes, such as fly ash, natural zeolite, wheat bran, bark and sawdust, peanut shells, rice husk, and cow bone, have been gradually developed for heavy metals removal from aqueous solution [6,7,8,9]
The prepared samples were observed by scanning electron microscope (SEM) (S-3400N, HITACHI). (2) Chemical group detection: the spectra of the adsorbents prepared as KBr discs were recorded at the wave number of 400–4000 cm−1 obtained from a Fourier translation infrared spectrum (FT-IR) spectrometer (Spectrum 2000, Perkin Elmer)

Summary

Introduction

A lot of effective separation technologies are used to remove heavy metals from aqueous solutions. Among these technologies, adsorption is the most common technique for the removal of heavy metal. Adsorption is the most common technique for the removal of heavy metal It can be used for the removal of pollutants, such as metal ions and organic compounds, from wastewater [1,2,3]. It becomes necessary to remove the excess iron and manganese from aqueous solution by an appropriate treatment technology before selecting the water as drinking water or releasing it into the environment [14]

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