TY - JOUR
T1 - Eco-friendly rice husk pre-treatment for preparing biogenic silica
T2 - Gluconic acid and citric acid comparative study
AU - Setiawan, Wahyu Kamal
AU - Chiang, Kung Yuh
N1 - Publisher Copyright:
© 2021
PY - 2021/9
Y1 - 2021/9
N2 - Carboxylic acid leaching has been established eco-friendly pre-treatment method for producing biogenic silica (BSi) from rice husk. The most urgent issue is for carboxylic acid to promote new readily biodegradable acids and enhance carboxylic acid sustainability in BSi preparation. This research investigates gluconic acid (GA) applicability for biogenic silica preparation from rice husk compared with citric acid (CA). The results demonstrated that GA was preferable to CA on BSi recovery with 89.91% efficiency. Although GA leaching promoted slightly higher silica loss, the primary metal alkali impurities, such as K2O, Na2O, and Al2O3, were effectively removed at 92–93%, 89–93%, 95–97%, respectively. The combination effect of silica loss and high removal impurities resulted in lower rice husk thermal decomposition activation energy. The characteristics of BSi prepared by GA leaching were comparable with CA leaching, mainly mesoporous with 114.06 m2/g of specific surface area and 0.23 cm3/g of the pore volume. In addition, GA leaching was environmentally better than CA leaching, indicated by minor contribution to all environmental impact indices. The findings suggested that GA could be a potential replacement for prevalent carboxylic acids in BSi preparation.
AB - Carboxylic acid leaching has been established eco-friendly pre-treatment method for producing biogenic silica (BSi) from rice husk. The most urgent issue is for carboxylic acid to promote new readily biodegradable acids and enhance carboxylic acid sustainability in BSi preparation. This research investigates gluconic acid (GA) applicability for biogenic silica preparation from rice husk compared with citric acid (CA). The results demonstrated that GA was preferable to CA on BSi recovery with 89.91% efficiency. Although GA leaching promoted slightly higher silica loss, the primary metal alkali impurities, such as K2O, Na2O, and Al2O3, were effectively removed at 92–93%, 89–93%, 95–97%, respectively. The combination effect of silica loss and high removal impurities resulted in lower rice husk thermal decomposition activation energy. The characteristics of BSi prepared by GA leaching were comparable with CA leaching, mainly mesoporous with 114.06 m2/g of specific surface area and 0.23 cm3/g of the pore volume. In addition, GA leaching was environmentally better than CA leaching, indicated by minor contribution to all environmental impact indices. The findings suggested that GA could be a potential replacement for prevalent carboxylic acids in BSi preparation.
KW - Biogenic silica
KW - Citric acid
KW - Gluconic acid
KW - Rice husk
UR - http://www.scopus.com/inward/record.url?scp=85104359880&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2021.130541
DO - 10.1016/j.chemosphere.2021.130541
M3 - 期刊論文
C2 - 33873070
AN - SCOPUS:85104359880
SN - 0045-6535
VL - 279
JO - Chemosphere
JF - Chemosphere
M1 - 130541
ER -
