Rice Husk Bio-Chars as Adsorbent for Methylene Blue and Ethinylestradiol from Water  

作　　者：Jonathan Lacuesta Iris Beatriz Vega Erramuspe Liji Sobhana Dennis Kronlund Jouko Peltonen Soledad Gutiérrez Pedro Fardim 

机构地区：[1]Department of Chemical Engineering,University of the Republic,Julio Herrera y Reissig 565,Montevideo,11300,Uruguay [2]Laboratory of Fibre and Cellulose Technology,Åbo Akademi University,Porthansgatan 3,Turku/Åbo,FI-20500,Finland [3]Laboratory of Physical Chemistry and Center of Excellence for Functional Materials,Åbo Akademi University,Porthansgatan 3,Turku/Åbo,FI-20500,Finland [4]Department of Chemical Engineering,KU Leuven,Celestijnenlaan 200F,Leuven,B-3001,Belgium

出　　处：《Journal of Renewable Materials》2020年第3期275-287,共13页可再生材料杂志（英文）

基　　金：financed in part by FinCEAL+Program,which provided a grant to participate in a research visit atÅbo Akademi University.

摘　　要：Biobased adsorbents are eco-friendly materials used for water and wastewater treatment and air cleaning.This research work explores the potential use of rice husk chars as a low-cost adsorbent for pollutants from water,such as methylene blue and ethinylestradiol.Rice husk chars are prepared by combustion of rice husks(RH-Char)or pre-treated rice husks(PT-Char).A third char(M-Char)supplied by a local company which uses rice husks as combustion material is also studied.The chars are characterized by field emission scanning electron microscopy(FE-SEM)in conjunction with energy dispersive X-ray spectroscopy(EDX),X-ray powder diffraction(XRD),and zeta-potential measurements.The three bio-chars are tested as adsorbent for the removal of two wastewater contaminants:methylene blue(MB)and ethinylestradiol(EE2).According to the results,RH-Char and PT-Char present zeta-potential values near−52 mV,whereas M-Char shows a zeta-potential value of−32 mV.Both RH-Char and PTChar are rich in amorphous SiO_(2) and M-Char has crystalline SiO_(2)(cristobalite).The bio-chars remove MB and EE2 efficiently showing the following results for the adsorption capacity of MB(inμmol g^(−1)):769.2(RH-Char),41.2(PT-Char),and 31.7(M-Char).The adsorption capacity values for EE2(inμmol g^(−1))are:33.1(RH-Char),19.1(PT-Char),and 16.9(M-Char).The information gathered in the present work evidences the potential of rice husks bio-chars for bio-remediation and may in future contribute to the conversion of a side-stream from the rice industry into value-added materials.

关 键 词：Rice husk BIO-CHAR thermal treatment ADSORPTION methylene blue ETHINYLESTRADIOL 

分 类 号：S51[农业科学—作物学]