CN109589909A - 一种多孔碳酸钙及其制备方法 - Google Patents
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Abstract
本发明公开了一种多孔碳酸钙及其制备方法,所述制备方法,包括如下步骤:步骤1:将碳酸钠和硝酸钙各配成一定摩尔浓度的溶液,取一定量硝酸钙置于反应瓶中,加入一定量聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入等体积等浓度的碳酸钠溶液,并继续超声1min,在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙;步骤2:用氯盐溶液对多孔碳酸钙进行浸渍修饰,干燥研磨后得到白色粉体状的修饰型多孔碳酸钙。所述多孔碳酸钙对燃煤烟气中含有SO3、SO2和金属Hg具有良好的吸附能力,能很好的应用于煤烟气的净化处理。
Description
技术领域
本发明涉及碳酸钙及其制备方法,具体涉及一种多孔碳酸钙及其制备方法。
背景技术
多孔碳酸钙微粒因其在色谱分析、装在生物大分子、药物缓释、仿生矿体、超疏水表面构建等方面有着广泛应用,受到越来越多的关注。
燃煤烟气含有SO3、SO2和金属Hg,对环境影响巨大,现在国内燃煤烟气净化的主流技术是将低氮燃烧、SCR、高效除尘和湿法脱硫依次串联,形成烟气多污染物联合控制体系,但是该体系的作用单一,无法对烟气中可凝结颗粒物(主要为SO3)及重金属Hg进行处理,且仍有SO2、NOx和粉尘残留。多孔碳酸钙具有良好的吸附能力,将多孔钛酸钙进行改性,使其应用于煤烟气净化是十分有必要的。
发明内容
本发明的目的在于提供一种多孔碳酸钙及其制备方法,本发明所述的多孔碳酸钙对燃煤烟气中含有SO3、SO2和金属Hg具有良好的吸附能力,能很好的应用于煤烟气的净化处理。
为了解决上述技术问题,本发明的技术方案为:
一种多孔碳酸钙的制备方法,包括如下步骤:
步骤1:将碳酸钠和硝酸钙各配成一定摩尔浓度的溶液,取一定量硝酸钙置于反应瓶中,加入一定量聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入等体积等浓度的碳酸钠溶液,并继续超声1min。在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙;
步骤2:用氯盐溶液对多孔碳酸钙进行浸渍修饰,干燥研磨后得到白色粉体状的修饰型多孔碳酸钙。
作为优选,步骤1中,碳酸钠和硝酸钙的溶液浓度为0.3mol/L。
作为优选,步骤1中,PVA和硝酸钙的的重量比0.1~0.3:1.0。
作为优选,步骤2中,所述氯盐为氯化钠、氯化钾、氯化铵中的至少一种。
作为优选,步骤2中,所述氯盐溶液中氯盐的质量浓度为8%-10%。
上述任一制备方法制备所得的修饰性多孔碳酸钙也属于本发明的保护范围。
所述任意制备方法制备所得的修饰性多孔碳酸钙能够吸附燃煤烟气中的SO3、SO2和金属Hg,其中对SO3的吸附效率在95%以上,对Hg的吸附效率在95%以上,能很好的应用于烟煤气的净化处理。
与现有技术相比,本发明的有益效果为:本发明所述修饰型多孔碳酸钙吸附剂的比表面积较大,吸附效果显著,对燃煤烟气中SO3的吸附效率可达到95%以上,对Hg的吸附效率在95%以上,可有效脱除烟气中的硫氧化物和重金属Hg等多污染物。本发明所述的修饰型多孔碳酸钙制备工艺简单,吸收效率高,易回收,具有推广价值。
具体实施方式
下面将结合具体实施例对本发明的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明的实施例,本领域普通技术人员所获得的所有其他实施例,都属于本发明的保护范围。
实施例1
一种多孔碳酸钙的制备方法,包括如下步骤:
步骤1:将碳酸钠和硝酸钙各配成0.3mol/L的溶液,取100ml硝酸钙置于反应瓶中,加入0.7g聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入100ml 0.3mol/L的碳酸钠溶液,并继续超声1min。在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙。
步骤2:配置8%的氯化钠水溶液,取100ml 8%的氯化钠水溶液加入烧杯,向烧杯中加入步骤1制备的碳酸钙10g,浸泡12h后过滤,100℃烘干后研磨得到白色粉状体的修饰型多孔碳酸钙。
将1.0g制备的修饰型多孔碳酸钙加入到固定床反应器中,所述修饰型多孔碳酸钙吸附SO3,在吸附开始后5min,对SO3的吸附效率为95%。所述修饰型多孔碳酸钙吸附Hg,在吸附开始后5min,对Hg的吸附效率为95%。
实施例2
一种多孔碳酸钙的制备方法,包括如下步骤:
步骤1:将碳酸钠和硝酸钙各配成0.3mol/L的溶液,取100ml硝酸钙置于反应瓶中,加入2.1g聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入100ml 0.3mol/L的碳酸钠溶液,并继续超声1min。在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙。
步骤2:配置10%的氯化钠水溶液,取100ml 10%的氯化钠水溶液加入烧杯,向烧杯中加入步骤1制备的碳酸钙10g,浸泡12h后过滤,100℃烘干后研磨得到白色粉状体的修饰型多孔碳酸钙。
将1.0g制备的修饰型多孔碳酸钙加入到固定床反应器中,所述修饰型多孔碳酸钙吸附SO3,在吸附开始后5min,对SO3的吸附效率为95.3%。所述修饰型多孔碳酸钙吸附Hg,在吸附开始后5min,对Hg的吸附效率为95.2%。
实施例3
一种多孔碳酸钙的制备方法,包括如下步骤:
步骤1:将碳酸钠和硝酸钙各配成0.3mol/L的溶液,取100ml硝酸钙置于反应瓶中,加入2.1g聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入100ml 0.3mol/L的碳酸钠溶液,并继续超声1min。在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙。
步骤2:配置10%的氯化铵水溶液,取100ml 10%的氯化铵水溶液加入烧杯,向烧杯中加入步骤1制备的碳酸钙10g,浸泡12h后过滤,100℃烘干后研磨得到白色粉状体的修饰型多孔碳酸钙。
将1.0g制备的修饰型多孔碳酸钙加入到固定床反应器中,所述修饰型多孔碳酸钙吸附SO3,在吸附开始后5min,对SO3的吸附效率为95.2%。所述修饰型多孔碳酸钙吸附Hg,在吸附开始后5min,对Hg的吸附效率为95.4%。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所有的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (7)
1.一种多孔碳酸钙的制备方法,其特征在于,包括如下步骤:
步骤1:将碳酸钠和硝酸钙各配成一定摩尔浓度的溶液,取一定量硝酸钙置于反应瓶中,加入一定量聚乙烯醇(PVA),搅拌溶解,稳定30min,在功率为900w的超声波细胞破碎机的超声下,迅速往混合溶液中加入等体积等浓度的碳酸钠溶液,并继续超声1min。在室温下静置24小时,离心,分别用水、乙醇洗涤3次,得到多孔碳酸钙;
步骤2:用氯盐溶液对多孔碳酸钙进行浸渍修饰,干燥研磨后得到白色粉体状的修饰型多孔碳酸钙。
2.如权利要求1所述的多孔碳酸钙的制备方法,所述步骤1中,碳酸钠和硝酸钙的溶液浓度为0.3mol/L。
3.如权利要求1所述的多孔碳酸钙的制备方法,所述步骤1中,PVA和硝酸钙的的重量比0.1~0.3:1.0。
4.如权利要求1所述的多孔碳酸钙的制备方法,所述步骤2中,所述氯盐为氯化钠、氯化钾、氯化铵中的至少一种。
5.如权利要求1所述的多孔碳酸钙的制备方法,所述步骤2中,所述氯盐溶液中氯盐的质量浓度为8%-10%。
6.权利要求1至5任一制备方法制备获得的多孔碳酸钙。
7.权利要求6所述的多孔碳酸钙在烟煤气的净化处理中的应用。
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