MgCO3·3H2O晶须的制备及其生长机制的研究

doi:10.11962/1006-4990.2019-0588

无机盐工业 ›› 2020, Vol. 52 ›› Issue (5): 22-26.doi: 10.11962/1006-4990.2019-0588

MgCO₃·3H₂O晶须的制备及其生长机制的研究

王彦霞,程文婷(),方莉,程芳琴

山西大学资源与环境工程研究所,山西省煤炭废弃物高附加值利用协同中心,山西太原 030006

收稿日期:2019-11-21 出版日期:2020-05-10 发布日期:2020-05-21
作者简介:王彦霞（1994— ）,女,硕士研究生,研究方向为MgO晶须的可控制备。
基金资助:
国家自然科学基金(U1707603)

Study on preparation and growth mechanism of MgCO₃·3H₂O whiskers

Wang Yanxia,Cheng Wenting(),Fang Li,Cheng Fangqin

Institute of Resources and Environmental Engineering,Shanxi Collaborative Center of High Value-added Utilization of Coal-related Wastes,Shanxi University,Taiyuan 030006,China

Received:2019-11-21 Published:2020-05-10 Online:2020-05-21

摘要/Abstract

摘要：

以MgCl₂·6H₂O和NH₄HCO₃为原料,CH₃COONa·3H₂O为形貌控制剂,采用沉淀结晶法制备MgCO₃·3H₂O晶须,考察了不同添加量的CH₃COONa·3H₂O对晶须结晶过程和形貌的影响,并研究了晶须在该体系中的生长机制。结果表明：当体系中加入质量分数为0.23%的CH₃COONa·3H₂O时可以成功制备长径比约为30的棒状MgCO₃·3H₂O晶须,CH₃COONa·3H₂O的存在促进了MgCO₃·3H₂O晶须的形成。该体系中晶须的生长过程：首先形成无定形的4MgCO₃·Mg（OH）₂·4H₂O,之后无定形4MgCO₃·Mg（OH）₂·4H₂O逐渐转变为MgCO₃·3H₂O并生长成较大长径比的棒状MgCO₃·3H₂O晶须。这是因为CH₃COONa·3H₂O电离产生的Na ⁺选择性吸附在MgCO₃·3H₂O晶体轴向的（101）晶面,抑制了该晶面生长,而径向晶面生长速率未受到影响,从而促使无定形MgCO₃·3H₂O生长成棒状晶须。

关键词: MgCO₃·3H₂O晶须, CH₃COONa·3H₂O, 沉淀结晶, 生长机制

Abstract:

MgCO₃·3H₂O whiskers was prepared with MgCl₂·6H₂O and NH₄HCO₃ as raw materials and as CH₃COONa·3H₂O morphology control agent by precipitation crystallization method.The effects of different amounts of CH₃COONa·3H₂O on the crystal and morphology of MgCO₃·3H₂O and the growth mechanism of whiskers in the system were investigated.The results showed that the rod-shaped MgCO₃·3H₂O whiskers with a length to diameter ratio of 30 can be successfully prepared when the amount of CH₃COONa·3H₂O added was 0.23%（mass fraction）.CH₃COONa·3H₂O may be beneficial to the formation of whiskers,and the growth mechanism of which was proposed：firstly,amorphous 4MgCO₃·Mg（OH）₂·4H₂O was formed,and then they gradually transformed into MgCO₃·3H₂O and grown into rod-shaped whiskers.The Na ⁺ produced by CH₃COONa·3H₂O were selectively adsorbed on the（101） crystal plane of the axial direction of MgCO₃·3H₂O crystal,which inhibited the growth of the crystal plane,and the radial growth was not significantly affected,which promoted amorphous MgCO₃·3H₂O grew into the rod whiskers.

Key words: MgCO₃·3H₂O whisker, CH₃COONa·3H₂O, precipitation crystallization, growth mechanism

中图分类号:

TQ132.2

王彦霞,程文婷,方莉,程芳琴. MgCO₃·3H₂O晶须的制备及其生长机制的研究[J]. 无机盐工业, 2020, 52(5): 22-26.

Wang Yanxia,Cheng Wenting,Fang Li,Cheng Fangqin. Study on preparation and growth mechanism of MgCO₃·3H₂O whiskers[J]. Inorganic Chemicals Industry, 2020, 52(5): 22-26.

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反应时间/min	m/ mg	w₁/ %	w₂/ %	w₃/ %	（m₁/m）/ %	（m₂/m）/ %
7	9.72	28.4	27.6	6.8	33.0	67.0
30	9.90	28.5	27.5	7.5	39.8	60.2
75	8.98	34.2	31.8	3.7	100.0	0.0
270	6.14	21.9	34.6	2.9	0.0	100.0

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MgCO₃·3H₂O晶须的制备及其生长机制的研究

Study on preparation and growth mechanism of MgCO₃·3H₂O whiskers

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