机械力化学法制备钙铝复合材料用于深度脱氟

郭琳; 张其武

doi:10.13779/j.cnki.issn1001-0076.2021.01.001

机械力化学法制备钙铝复合材料用于深度脱氟

郭琳,
张其武^,

武汉理工大学资源与环境工程学院, 湖北武汉 430070

详细信息

作者简介: 郭琳(1996-)女, 在读硕士研究生, 主要从事水环境与土壤环境治理研究

通讯作者: 张其武, 教授, 博士生导师, zhangqw@whut.edu.cn

中图分类号: X751

收稿日期: 2020-12-16

刊出日期: 2021-02-25

Calcium-Aluminum Composite Material Prepared by Mechanochemical Method for Deep Defluorination

GUO Lin,
ZHANG Qiwu^,

School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China

More Information

Corresponding author: ZHANG Qiwu, zhangqw@whut.edu.cn

Received Date: 16 December 2020

Publish Date: 25 February 2021

摘要

摘要:
水体中氟化物含量超标一直是全球关注的环境问题之一，使用含钙物质生成氟化钙沉淀法，出水浓度一般在8~9 mg/L，不能满足饮用水中含氟低于1.5 mg/L的世卫标准。为此，本文基于机械力活化的概念，使用行星磨球磨钙铝氢氧化物合成加藤石材料[Ca₃Al₂（OH）₁₂]，通过OH^-与F^-离子交换的新脱氟机理，实现了饮水达标的深度脱氟。在Ca：Al摩尔比为3：2、球磨1 h、转速为500 r/min的条件下，制备的材料可将氟离子浓度从10 mg/L降到0.32 mg/L。用高岭石代替氢氧化铝也能实现类似的深度脱氟，为含氟废水的高度净化提供了新的思路和可行性。
- 机械力球磨 /
- 深度脱氟 /
- 氟离子 /
- 加藤石相 /
- 高岭石
Abstract:
Excessive fluoride content in water has always been one of the environmental issues of global concern. The calcium fluoride precipitation method produced by calcium-containing substances with the effluent concentration of 8-9 mg/L cannot meet the WHO standard that the fluorine content in drinking water is less than 1.5 mg/L. Based on the concept of mechanochemical activation, the goal of deep defluoridation of drinking water up to standard has been achieved by the Ca₃Al₂(OH)₁₂ synthesized by grinding calcium aluminum hydroxide using planetary milling balls, which is based on a new defluorination mechanism of OH^- and F^- exchange. The prepared material can reduce the fluoride ion concentration from 10mg/L to 0.32 mg/L under the condition of the molar ratio of Ca: Al being 3:2, grinding time of 1h and the stirred speed of 500 r/min. Substituting kaolinite for aluminum hydroxide can also achieve similar deep defluorination, which provides new ideas and feasibility for the high purification of fluorine-containing wastewater.
- mechanochemistry /
- deep defluorination /
- fluoride ions /
- katoite /
- kaolinite

HTML全文

图 1 球磨活化Ca(OH)₂和Al(OH)₃中不同Ca : Al摩尔比对去除氟离子去除效果随反应时间的变化(球磨时间1 h，搅拌时间2 h)

Figure 1.

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图 2 球磨时间对材料除氟的效果的影响(Ca : Al摩尔比3 : 2, 搅拌时间2 h)

Figure 2.

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图 3 合成材料的XRD图谱(球磨时间1 h，Ca : Al摩尔比3 : 2)

Figure 3.

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图 4 材料在不同浓度氟离子溶液中沉淀物的XRD图谱(球磨时间1h，搅拌时间2 h，Ca : Al摩尔比3 : 2)

Figure 4.

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图 5 共存阴离子对材料除氟性能的影响(样品制备条件球磨1 h，Ca : Al摩尔比3 : 2, 搅拌时间2 h)

Figure 5.

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图 6 球磨活化Ca(OH)₂和高岭土中不同Ca : Al摩尔比对去除氟离子影响(球磨时间1 h，搅拌时间12 h)

Figure 6.

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图 7 球磨氢氧化钙和高岭石的产物XRD图谱(球磨时间1 h，Ca : Al摩尔比3 : 2)

Figure 7.

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图 8 球磨样品和原样的TG(a)和DSC(b)结果(球磨时间1 h，Ca : Al摩尔比3 : 2)

Figure 8.

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表 1 高岭土样品的主要化学成分

Table 1. Main chemical compositions of kaolin sample

Composition	Na₂O	MgO	Al₂O₃	SiO₂	P₂O₅	SO₃
Mass/%	0.14	0.19	36.91	45.50	0.16	0.86

Composition	K₂O	CaO	TiO₂	Fe₂O₃	LOI
Mass/%	0.24	0.44	1.15	0.59	13.82

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参考文献(12)

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