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CO2 can decrease the dissolution rate of ashed phytoliths by Anh T.Q. Nguyen; Anh M. Nguyen; Nga T.T. Pham; Huan X. Nguyen; Quan T. Dang; Tien M. Tran; Anh D. Nguyen; Phong D. Tran; Minh N. Nguyen is a Environmental Science article available to read on EtoBox.

What is CO2 can decrease the dissolution rate of ashed phytoliths about?

Phytoliths are silica structures formed in various silicon (Si)-rich plant species. These structures are a fastreacting source of available Si for soils and crops and act as a platform for the sequestration of organic matter and CO 2 . The solubility of phytoliths has been intensively studied. However, little is known about the effect of gases, e.g., CO 2 , which are commonly emitted from soils. It is hypothesized that CO 2 can interact and alter the dissolution rate of phytoliths. In this study, we conducted batch experiments for ashed phytoliths obtained from the controlled pyrolysis of rice straw at 300, 500, 700 and 900 • C and evaluated the Si release along with changes in surface charge (zeta potential) under the influence of CO 2 flow. It was found that the ashed phytoliths possessed negative surface charges and released soluble alkaline ions, which enabled sequestration of CO 2 by shifting the equilibrium of H 2 CO 3 , HCO 3 -and CO 3 2-more towards HCO 3 -and CO 3 2-. Conversely, the intensifying presence of CO 2 acidified the suspensions containing the phytoliths, stimulated the protonation of the phytolith surface, and decreased nucleophilic attacks from OH -and other an

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Author

Anh T.Q. Nguyen; Anh M. Nguyen; Nga T.T. Pham; Huan X. Nguyen; Quan T. Dang; Tien M. Tran; Anh D. Nguyen; Phong D. Tran; Minh N. Nguyen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0016-7061)

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)