Effect of pH on formation of single-phase vaterite

Mitsuaki Kogo; Tetsuo Umegaki; Yoshiyuki Kojima

doi:10.1016/j.jcrysgro.2019.04.005

Effect of pH on formation of single-phase vaterite

Mitsuaki Kogo, Tetsuo Umegaki, Yoshiyuki Kojima

College of Science and Technology

Nihon University

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

This paper reports on the effect of pH on polymorphism of calcium carbonate (vaterite) formed in the CaCl ₂ -Na ₂ CO ₃ -H ₂ O reaction system. The initial pH of CaCl ₂ aqueous solution was adjusted to the initial pH 2.0–11.3 using HCl and NH ₃ aqueous solution. The initial pH was 6.5 without pH adjustment. When the reaction was carried out, amorphous calcium carbonate (ACC) was formed at the early stage of the reaction and crystallized to calcite and vatrite after 3 min of stirring. Formation ratio of vaterite at this time was 60％. Single-phase vaterite was formed at initial pH 2.0–2.5. Further, focusing on the pH during ACC crystallization. When HCO ₃ ⁻ ions were 80% or more during ACC crystallization, single-phase vaterite was formed.

Original language	English
Pages (from-to)	35-38
Number of pages	4
Journal	Journal of Crystal Growth
Volume	517
DOIs	https://doi.org/10.1016/j.jcrysgro.2019.04.005
Publication status	Published - 1 Jul 2019

Keywords

A1. Crystal morphology
A1. Crystallites
A1. X-ray diffraction
A2. Growth from solutions
B1. Calcium compounds
B1. Inorganic compounds

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10.1016/j.jcrysgro.2019.04.005

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title = "Effect of pH on formation of single-phase vaterite",

abstract = " This paper reports on the effect of pH on polymorphism of calcium carbonate (vaterite) formed in the CaCl 2 -Na 2 CO 3 -H 2 O reaction system. The initial pH of CaCl 2 aqueous solution was adjusted to the initial pH 2.0–11.3 using HCl and NH 3 aqueous solution. The initial pH was 6.5 without pH adjustment. When the reaction was carried out, amorphous calcium carbonate (ACC) was formed at the early stage of the reaction and crystallized to calcite and vatrite after 3 min of stirring. Formation ratio of vaterite at this time was 60％. Single-phase vaterite was formed at initial pH 2.0–2.5. Further, focusing on the pH during ACC crystallization. When HCO 3 − ions were 80% or more during ACC crystallization, single-phase vaterite was formed.",

keywords = "A1. Crystal morphology, A1. Crystallites, A1. X-ray diffraction, A2. Growth from solutions, B1. Calcium compounds, B1. Inorganic compounds",

author = "Mitsuaki Kogo and Tetsuo Umegaki and Yoshiyuki Kojima",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

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day = "1",

doi = "10.1016/j.jcrysgro.2019.04.005",

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T1 - Effect of pH on formation of single-phase vaterite

AU - Kogo, Mitsuaki

AU - Umegaki, Tetsuo

AU - Kojima, Yoshiyuki

PY - 2019/7/1

Y1 - 2019/7/1

N2 - This paper reports on the effect of pH on polymorphism of calcium carbonate (vaterite) formed in the CaCl 2 -Na 2 CO 3 -H 2 O reaction system. The initial pH of CaCl 2 aqueous solution was adjusted to the initial pH 2.0–11.3 using HCl and NH 3 aqueous solution. The initial pH was 6.5 without pH adjustment. When the reaction was carried out, amorphous calcium carbonate (ACC) was formed at the early stage of the reaction and crystallized to calcite and vatrite after 3 min of stirring. Formation ratio of vaterite at this time was 60％. Single-phase vaterite was formed at initial pH 2.0–2.5. Further, focusing on the pH during ACC crystallization. When HCO 3 − ions were 80% or more during ACC crystallization, single-phase vaterite was formed.

AB - This paper reports on the effect of pH on polymorphism of calcium carbonate (vaterite) formed in the CaCl 2 -Na 2 CO 3 -H 2 O reaction system. The initial pH of CaCl 2 aqueous solution was adjusted to the initial pH 2.0–11.3 using HCl and NH 3 aqueous solution. The initial pH was 6.5 without pH adjustment. When the reaction was carried out, amorphous calcium carbonate (ACC) was formed at the early stage of the reaction and crystallized to calcite and vatrite after 3 min of stirring. Formation ratio of vaterite at this time was 60％. Single-phase vaterite was formed at initial pH 2.0–2.5. Further, focusing on the pH during ACC crystallization. When HCO 3 − ions were 80% or more during ACC crystallization, single-phase vaterite was formed.

KW - A1. Crystal morphology

KW - A1. Crystallites

KW - A1. X-ray diffraction

KW - A2. Growth from solutions

KW - B1. Calcium compounds

KW - B1. Inorganic compounds

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U2 - 10.1016/j.jcrysgro.2019.04.005

DO - 10.1016/j.jcrysgro.2019.04.005

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AN - SCOPUS:85064280206

SN - 0022-0248

VL - 517

SP - 35

EP - 38

JO - Journal of Crystal Growth

JF - Journal of Crystal Growth

ER -

Effect of pH on formation of single-phase vaterite

Abstract

Keywords

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