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    • ISSN: 2010-0264
    • Frequency: Bimonthly (2010-2014); Monthly (Since 2015)
    • DOI: 10.18178/IJESD
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Editor-in-chief
The University of Queensland, Australia
It is my honor to be the editor-in-chief of IJESD. The journal publishes good papers in the field of environmental science and development.
IJESD 2018 Vol.9(2): 38-42 ISSN: 2010-0264
doi: 10.18178/ijesd.2018.9.2.1070

Preparation of Sulfur-Impregnated Carbonaceous Adsorbent from Rice Husk for Heavy Metal Removal from Aqueous Solution

Takaaki Wajima
Abstract—A novel carbonaceous adsorbent with heavy metal removal from aqueous solution was prepared from rice husk using sulfur impregnation. The rice husk was immersed in 0.05 - 3 M K2S solution to prepare sulfur-immersed materials, and the immersed-materials were heated at 100 - 700 oC in nitrogen gas to produce the sulfur-impregnated carbonaceous adsorbent by pyrolysis. The contents of carbon and sulfur in the adsorbent and abilities of adsorbent to remove heavy metals from aqueous solution were examined. The product prepared from rice husk immersed in 1 M K2S solution by pyrolysis at 300 oC indicates a maximum removal for nickel ion. This product has the removal ability of the heavy metals, Ni2+, Zn2+, Cd2+, Pb2+, Cu2+ and Fe3+. With increasing the pH of the solution, removal of heavy metal increase, and the order of increase for heavy metal removal is Fe3+ > Pb2+ ≒ Cu2+ > Zn2+> Cd2+ > Ni2+. The order of selectivity of the adsorbent in the mixed solution indicates Fe3+ > Pb2+ > Cu2+ > Cd2+ > Zn2+≒ Ni2+, and the product can remove all metal ions in the mixed solution above pH 6.

Index Terms—Rice husk, sulfur-impregnated adsorbent, pyrolysis, heavy metal removal, wastewater treatment.

Takaaki Wajima is with the Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan (e-mail: wajima@tu. chiba-u.ac.jp).

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Cite: Takaaki Wajima, "Preparation of Sulfur-Impregnated Carbonaceous Adsorbent from Rice Husk for Heavy Metal Removal from Aqueous Solution," International Journal of Environmental Science and Development vol. 9, no. 2, pp. 38-42, 2018.

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