CN110559874B - 一种具有吸附功能的石墨相氮化碳分离膜制备方法及制得的产品 - Google Patents
一种具有吸附功能的石墨相氮化碳分离膜制备方法及制得的产品 Download PDFInfo
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Abstract
本发明公开了一种具有吸附功能的石墨相氮化碳分离膜制备方法及制得的产品,该方法以Hummers法剩余液为纳米水合氧化锰的合成前驱体,往其中添加一定量的石墨相氮化碳粉体后,超声分散均匀,并调节溶液pH值获得沉淀,再采用过滤分离、清洗和干燥工艺,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;再将该混合物沉淀在水中超声分散,即可获得制膜浆料。采用该浆料并结合一定的制膜方法,即可在多孔无机或有机载体上制备具有吸附功能的石墨相氮化碳分离膜产品。本发明具有工艺简便、成本低廉、绿色环保、产品性能优异等优点,市场前景广阔。
Description
技术领域
本发明属于分离膜材料制备技术领域,尤其涉及一种具有吸附功能的石墨相氮化碳分离膜制备方法及制得的产品。
背景技术
膜法水处理技术具有适用范围广、效率高、装置简单、易操作和易控制、无二次污染等诸多优势,在各类污染废水的回收处理等领域已得到广泛应用。现阶段,随着众多行业对废水处理精度的要求越来越高,针对水中的各类离子或小分子有机物等污染物的高效去除,已经日益迫切。目前,针对上述各类污染物的去除,就膜法水处理技术而言,主要有电渗析、纳滤、反渗透等,该些技术虽然在各类离子或小分子有机污染物的处理上具有一定的技术优势,但仍然存在处理精度有待提升、能耗较高、处理成本偏高、技术要求较高等一些经济上或者技术上不足。同时,吸附法作为一种工艺简单、能源消耗低、选择性高的分离技术,已经被广泛应用于去除水中各类污染物。但是现阶段,由于常用的吸附剂普遍呈现粉末分散状,由此导致其一般均具有易造成二次污染、吸附性能欠稳定、难回收等诸多缺点。
由此,为解决分离膜通常不具备吸附性和吸附剂不具备膜分离性能的关键技术问题,将分离膜与高效吸附剂相糅合,在充分利用两种材料技术优势的基础上,同时又适当规避两种材料的技术不足,则可以达到同步实现分离和吸附双功能的目的,从而实现水体的高精度净化。在此基础上,及时开发一种工艺简便、成本低廉、绿色环保、性能优异的具有吸附功能的新型分离膜材料制备技术及相关产品,对于保护水环境和促进膜行业发展均具有重要的价值和意义。
发明内容
本发明的目的在于提供一种工艺简便、成本低廉、性能优异、绿色环保的具有吸附功能的石墨相氮化碳分离膜制备方法及制得的产品。
为解决分离膜通常不具备吸附性和吸附剂不具备膜分离性能的关键技术问题,本发明的技术方案是:一种具有吸附功能的石墨相氮化碳分离膜的制备方法,其特征在于:包括以下步骤:
步骤一:在Hummers法剩余液中,加入一定量的石墨相氮化碳粉体,超声分散形成均匀的混合液;
步骤二:调节步骤一制备的混合液pH值,促进沉淀形成;
步骤三:将步骤二获得的沉淀进行过滤分离后,清洗干燥,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;
步骤四:将步骤三获得的混合物沉淀超声分散到水中,获得制膜浆料;
步骤五:将步骤四获得的制膜浆料,采用适当的制膜方法和热处理工艺,即可在多孔载体上制得具有吸附功能的石墨相氮化碳分离膜。
所述步骤一中的Hummers法剩余液为去除氧化石墨和氧化石墨烯后得到的含有锰离子的剩余液。
所述步骤一中石墨相氮化碳粉体的添加量为5~20 g/L。
所述步骤二中的混合液pH值调节剂为氨水溶液;沉淀形成时,混合液pH值为6~8。
所述步骤四中制膜浆料的固含量为5~10 wt%。
所述步骤五中制膜方法为旋涂法或浸渍法或抽滤法。
所述步骤五中热处理工艺包括:热处理温度为100~150℃,热处理时间为1~2小时。
所述步骤五中载体包括有机或无机多孔载体,且该载体的平均孔径为100~200纳米。
所述方法制得的产品,其特征在于:所述步骤五中石墨相氮化碳分离膜的厚度为200~500微米。
所述石墨相氮化碳分离膜具有高分离性能和高吸附性能。
本发明针对目前普遍存在的分离膜通常不具备吸附性和吸附剂不具备膜分离性能的关键技术问题,以Hummers法剩余液为纳米水合氧化锰的合成前驱体,往其中添加一定量的石墨相氮化碳粉体后,并调节溶液pH值,再采用过滤分离、清洗和干燥工艺,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;采用该混合物沉淀并结合一定的制膜方法,即可在多孔无机或有机载体上制备具有吸附功能的石墨相氮化碳分离膜产品。本发明具有工艺简便、成本低廉、绿色环保、产品性能优异等优点,市场前景广阔。
附图说明
图1为本发明的制备工艺流程图;
图2为水合氧化锰的物相分析图;
图3为石墨相氮化碳分离膜的物相分析图。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细的说明。
实施例1
量取去除氧化石墨和氧化石墨烯后的Hummers法剩余液200毫升,添加4 g石墨相氮化碳粉体,超声分散形成均匀的混合液;再向该混合液中滴加氨水溶液至沉淀形成,此时混合液pH值为8。将上述沉淀进行过滤分离、清洗和干燥后,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;称取适量的上述混合物沉淀超声分散到水中,获得固含量为10 wt%的制膜浆料;采用该制膜浆料,结合旋涂法,在平均孔径为150纳米的氧化铝多孔陶瓷支撑体上,制备含纳米水合氧化锰的石墨相氮化碳分离膜;该膜在100℃下处理2小时,即可制得厚度为500微米的相应膜产品。
对上述含纳米水合氧化锰的石墨相氮化碳分离膜进行吸附分离实验,以含锌离子的水溶液为处理对象,常温和中性条件下,该膜对锌离子的吸附量达到110 mg/g,膜渗透通量为106 L·m-2·h-1·bar-1。
实施例2
量取去除氧化石墨和氧化石墨烯后的Hummers法剩余液100毫升,添加0.5 g石墨相氮化碳粉体,超声分散形成均匀的混合液;再向该混合液中滴加氨水溶液至沉淀形成,此时混合液pH值为7;将上述沉淀进行过滤分离、清洗和干燥后,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;称取适量的上述混合物沉淀超声分散到水中,获得固含量为5 wt%的制膜浆料;采用该制膜浆料,结合旋涂法,在平均孔径为100纳米的氧化锆多孔陶瓷支撑体上,制备含纳米水合氧化锰的石墨相氮化碳分离膜。该膜在150℃下处理1小时,即可制得厚度为200微米的相应膜产品。
对上述含纳米水合氧化锰的石墨相氮化碳分离膜进行吸附分离实验,以含苯酚的水溶液为处理对象,常温和中性条件下,该膜对苯酚的吸附量达到230 mg/g,膜渗透通量为217 L·m-2·h-1·bar-1。
实施例3:
量取去除氧化石墨和氧化石墨烯后的Hummers法剩余液100毫升,添加1 g石墨相氮化碳粉体,超声分散形成均匀的混合液;再向该混合液中滴加氨水溶液至沉淀形成,此时混合液pH值为6。将上述沉淀进行过滤分离、清洗和干燥后,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;称取适量的上述混合物沉淀超声分散到水中,获得固含量为8 wt%的制膜浆料;采用该制膜浆料,结合旋涂法,在平均孔径为200纳米的聚四氟乙烯滤膜支撑体上,制备含纳米水合氧化锰的石墨相氮化碳分离膜;该膜在100℃下处理2小时,即可制得厚度为300微米的相应膜产品。
对上述含纳米水合氧化锰的石墨相氮化碳分离膜进行吸附分离实验,以含锆离子的水溶液为处理对象,常温和中性条件下,该膜对锆离子的吸附量达到280 mg/g,膜渗透通量为165 L·m-2·h-1·bar-1。
本发明的工艺参数不局限于上述列举的实施例。
Claims (8)
1.一种具有吸附功能的石墨相氮化碳分离膜的制备方法,其特征在于:包括以下步骤:
步骤一:在Hummers法剩余液中,加入一定量的石墨相氮化碳粉体,超声分散形成均匀的混合液;
步骤二:调节步骤一制备的混合液pH值,促进沉淀形成;
步骤三:将步骤二获得的沉淀进行过滤分离后,清洗干燥,获得纳米水合氧化锰与石墨相氮化碳混合沉淀;
步骤四:将步骤三获得的混合物沉淀超声分散到水中,获得制膜浆料;
步骤五:将步骤四获得的制膜浆料,采用适当的制膜方法和热处理工艺,即可在多孔载体上制得具有吸附功能的石墨相氮化碳分离膜;
所述步骤五中石墨相氮化碳分离膜的厚度为200~500微米。
2.根据权利要求1所述的制备方法,其特征在于:所述步骤一中的Hummers法剩余液为去除氧化石墨和氧化石墨烯后得到的含有锰离子的剩余液。
3.根据权利要求1所述的制备方法,其特征在于:所述步骤一中石墨相氮化碳粉体的添加量为5~20 g/L。
4.根据权利要求1所述的制备方法,其特征在于:所述步骤二中的混合液pH值调节剂为氨水溶液;沉淀形成时,混合液pH值为6~8。
5.根据权利要求1所述的制备方法,其特征在于:所述步骤四中制膜浆料的固含量为5~10 wt%。
6.根据权利要求1所述的制备方法,其特征在于:所述步骤五中制膜方法为旋涂法或浸渍法或抽滤法。
7.根据权利要求1所述的制备方法,其特征在于:所述步骤五中热处理工艺包括:热处理温度为100~150℃,热处理时间为1~2小时。
8.根据权利要求1所述的制备方法,其特征在于:所述步骤五中载体包括有机或无机多孔载体,且该载体的平均孔径为100~200纳米。
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