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Biosorbents for Removing Hazardous Metals and Metalloids

Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo-machi 1, Saga 840-8574, Japan
Nanomaterial Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaragi 305-8565, Japan
Central Department of Chemistry, Tribhuvan University, Kritipur, Kathmandu, Nepal
Department of Chemical Engineering, Faculty of Engineering and Technology, Jessore University of Science and Technology, Jessore 7408, Bangladesh
Department of Applied Chemistry, Faculty of Engineering, University of Miyazaki, Gakuen Kibanadai-nishi 1-1, Miyazaki 889-2192, Japan
Author to whom correspondence should be addressed.
The research work is conducted in Saga University.
Materials 2017, 10(8), 857;
Received: 12 May 2017 / Revised: 5 July 2017 / Accepted: 7 July 2017 / Published: 26 July 2017
(This article belongs to the Special Issue Sorption Materials for Environment Purification)
Biosorbents for remediating aquatic environmental media polluted with hazardous heavy metals and metalloids such as Pb(II), Cr(VI), Sb(III and V), and As(III and V) were prepared from lignin waste, orange and apple juice residues, seaweed and persimmon and grape wastes using simple and cheap methods. A lignophenol gel such as lignocatechol gel was prepared by immobilizing the catechol functional groups onto lignin from sawdust, while lignosulfonate gel was prepared directly from waste liquor generated during pulp production. These gels effectively removed Pb(II). Orange and apple juice residues, which are rich in pectic acid, were easily converted using alkali (e.g., calcium hydroxide) into biosorbents that effectively removed Pb(II). These materials also effectively removed Sb(III and V) and As(III and V) when these were preloaded with multi-valent metal ions such as Zr(IV) and Fe(III). Similar biosorbents were prepared from seaweed waste, which is rich in alginic acid. Other biosorbents, which effectively removed Cr(VI), were prepared by simply treating persimmon and grape wastes with concentrated sulfuric acid. View Full-Text
Keywords: biosorbents; adsorptive removal; aquatic environment; hazardous metals and metalloids biosorbents; adsorptive removal; aquatic environment; hazardous metals and metalloids
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MDPI and ACS Style

Inoue, K.; Parajuli, D.; Ghimire, K.N.; Biswas, B.K.; Kawakita, H.; Oshima, T.; Ohto, K. Biosorbents for Removing Hazardous Metals and Metalloids. Materials 2017, 10, 857.

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