Use of Rice Husk Hydrolyzed by Subcritical Water to Obtain Silica from Agro-Industrial Waste

被引：7
作者：
Draszewski, Crisleine P. [1 ]
Silveira, Norton M. [1 ]
Brondani, Michel [1 ,3 ]
Cruz, Alyson de Souza [2 ]
Rezzadori, Katia [2 ]
Mayer, Flavio D. [1 ]
Abaide, Ederson R. [1 ]
Mazutti, Marcio A. [1 ]
Tres, Marcus V. [2 ]
Zabot, Giovani L. [2 ]
机构：
[1] Fed Univ St Maria, Dept Chem Engn, Santa Maria, Brazil
[2] Fed Univ St Maria UFSM, Lab Agroind Proc Engn LAPE, Cachoeira do Sul, Brazil
[3] Fed Univ St Maria, Dept Chem Engn, 1000 Roraima Ave, BR-97105900 Santa Maria, Brazil
来源：
ENVIRONMENTAL ENGINEERING SCIENCE | 2022年 / 39卷 / 12期
关键词：
agro-industrial waste; process integration; rice husks; silica; subcritical water; FERMENTABLE SUGARS; ACTIVATED CARBON; PRETREATMENT; ADSORBENTS; RESIDUES; BIOFUELS; BIOMASS; SIO2; ASH;
D O I：
10.1089/ees.2021.0501
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Hydrolyzed rice husk (HRH) obtained from subcritical water hydrolysis at different process temperatures (180 degrees C, 220 degrees C, and 260 degrees C) was investigated as raw material for silica extraction. The composition of fresh RH, HRH, ash, and silica; residual mass HRH structure; thermal properties; and morphology of synthesized silica powder were evaluated using thermogravimetric analysis (TGA), X-ray diffractometer (XRD), Fourier transform infrared (FT-IR) spectroscopy, and scanning electron microscopy (SEM). TGA showed a maximum mass loss of 13% until 600 degrees C. Above 600 degrees C, a negligible mass loss was observed for all samples, indicating the thermal stability of extracted silica. XRD analysis revealed the same broad peak of silica for RH and all HRH samples at 2 theta = 22 degrees, confirming amorphous silica. FT-IR results indicated the presence of silica-oxygen bonding (Si-O-Si) at 1,070-1,090/cm, while SEM showed similar SiO2 morphology for silica from RH and HRH processed at 180 degrees C, 220 degrees C, and 260 degrees C.
引用
收藏
页码：938 / 946
页数：9
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