CN108745396A - 一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法 - Google Patents
一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法 Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 18
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- 238000006555 catalytic reaction Methods 0.000 claims abstract description 7
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Abstract
本发明公开了一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法。通过将石墨相氮化碳(g‑C3N4)与金属有机框架原位耦合,在保留原有的框架结构的基础上,增强金属有机框架的限域效应。该材料可作为一种催化氧化水处理用催化剂,活化单过一硫酸盐、过二硫酸盐和过氧化氢,实现水中难降解有机污染物的高效降解,并且催化剂易回收,可重复利用。同时,本发明提出的催化剂用量少、反应时间短。本发明方法操作简单、便捷,纳米铁颗粒均匀分散在碳框架内部,在催化氧化水处理领域有较好的应用前景。
Description
技术领域
本发明涉及纳米材料和水处理的技术领域,具体地指一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法。
背景技术
随着现代工农业的发展,大量的人工合成有机物,如个人护肤品、抗生素、杀虫剂、染料等,直接排入环境,使得水体遭受污染。这些物质因其化学结构稳定、难生物降解,在自然界中存在时间长,对人和动物具有潜在的生物毒性而得到人们的广泛关注。针对这些难降解污染物,在进入环境前对含有这些污染物的污水进行有效处理是极为必要的。目前处理有机污染物的方法有很多,如物理学(物理吸附、絮凝和反渗透等)、化学法(焚烧、臭氧和湿式氧化等)和生物法(活性污泥和生物膜等)。生物处理方法对一些难降解有机物很难达到良好的处理效果。而传统的物理化学法往往会造成废料的堆积或二次污染等方面的问题。因此,寻求高效的处理方法成为当前水处理研究领域的重要课题之一。高级氧化技术是处理有毒难降解有机污染物的最有发展前途且对环境无二次污染的方法。虽然以H2O2为氧化剂的高级氧化技术能够实现大多数有机物的快速分解,但在实际有机物降解中,由于H2O2自身的不稳定性和所产生的羟基自由基在水溶液中存在寿命短以及对某些有机物如全氟羧酸等不能有效降解等缺点,而需要寻找新型氧化剂。基于硫酸根自由基的高级氧化技术具有产生的硫酸根自由基氧化能力强,氧化剂本身稳定性好、氧化剂利用率高和无毒无害等优点,在有机污染的降解及地下水和土壤修复中有着广泛的研究及应用。
应用硫酸根自由基高级氧化技术的关键是如何高效活化过硫酸盐产生硫酸根自由基。常规的活化方法包括紫外光、热、微波等物理手段和过渡金属离子等化学方法。由于物理方法能耗高、成本高,过渡金属离子等化学方法容易造成二次污染,从而限制了其广泛应用。因此,开发高效、稳定的多相催化剂是应用硫酸根自由基高级氧化技术的关键。
有机-无机纳米杂化材料是继单组分材料、复合材料和功能梯度材料之后的第四代新材料。它是以无机基团(如金属离子、簇合物或其他纳米簇)和有机配体桥连的无机有机聚集体,是一种分散均匀的多相材料,逐渐成为一类在吸附、催化和传感等领域很有前景的材料。金属有机框架材料(MOFs)作为一类有机-无机杂化材料,具有超分子微孔网络结构,可以将各种不同的具有催化活性的金属纳米颗粒客体等限域在其结构或孔内,方便地进行催化反应。MOFs的孔结构既起到限域客体的功能,同时也有利于催化反应底物和产物的传输。
现有技术中,如专利(CN103508434A)通过溶液浸渍的办法将硼氮类化合物限域到金属有机框架化合物ZIF-8的孔道内部,制备硼氮元素掺杂的微孔碳材料,实现硼氮元素的同时掺杂且微孔尺寸分别均匀,具备良好的氢气吸附性能和对二氧化碳的选择性吸附性能。专利(CN106477551A)采用PVP协助限域热解的方法在ZIF-8衍生的碳材料中引入分级孔结构。专利(107331877A)巧妙地利用碳化过程中的结构收缩效应,将ZIF结构转化为三维贯通的碳骨架孔道结构,利用高温下ZIF骨架的限域作用,将铂颗粒与ZIF结构中的金属离子原位合金化,并镶嵌在骨架结构中,形成具有孔道贯穿骨架和纳米级铂合金颗粒镶嵌结构的三维催化剂,大幅度提高了催化剂的活性、稳定性以及铂的利用率。
目前,通过高温煅烧MOFs可以制备碳基包裹金属的复合材料,但使用温度较高,易破坏原有金属框架的结构。石墨相氮化碳(g-C3N4),作为一种聚合物半导体,具有类似石墨的层状结构,同时还要良好的热稳定性、化学稳定性和理化性能。g-C3N4与金属有机框架耦合后,可增强金属有机框架的限域效应,可以限域制备出颗粒均匀分散的金属纳米粒子,表现出更好的催化性能。此外,限域制备出的材料所需温度较低,且能保持原有金属有机框架的形貌。
发明内容
本发明采用金属有机框架材料纳米限域零价铁来抑制颗粒的烧结和团聚,制备工艺简单、反应条件容易控制。制备的材料保持原有的形貌,铁元素主要以零价铁的形态分散在碳框架内部。框架内部孔道结构在限制颗粒烧结生长作用的同时还能很好的保持反应物能自由的进出其孔道内,保证了其有效的催化效果。
本发明提供了一种纳米限域零价铁@纺锤型多孔碳的制备方法,并能够在室温下活化单过一硫酸盐、过二硫酸盐和过氧化氢,形成催化氧化水处理方法。
为了实现上述目的,本发明的技术方案是:一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法,包括如下步骤:
(1)取5-20g尿素于一个带盖的氧化铝坩埚,将其置于马弗炉中,以2℃/min的升温速率升温至520-600℃,保温2-4小时,得到淡黄色块状g-C3N4,然后将块状g-C3N4研磨成粉末状;
(2)将三价铁盐0.3-1.0g和有机配体(2-氨基对苯二甲酸)0.2-0.8g溶于30-70mL的N,N-二甲基甲酰胺中,于常温下搅拌至透明溶液;
(3)取50-300mg步骤(1)合成的g-C3N4在搅拌下加入步骤(1)所得的透明溶液中,将其超声30分钟后,再在室温下搅拌10-30分钟得到悬浮液;
(4)将悬浮液转移至带有聚四氟乙烯内胆的高压反应釜,用不锈钢外壳密封后放入烘箱,于423-443K下,保持12-36小时;缓慢冷却至室温,将混合物离心分离,得到晶体;将得到的晶体分别用N,N-二甲基甲酰胺和无水乙醇洗涤2-3次,并离心分离;
(5)将分离后所得晶体放入真空干燥箱中,于90-110℃干燥10-24小时;将干燥后的晶体置于氮气氛围中煅烧,其中氮气流速为20-150mL/min,升温速率为5℃/min,升至600-700℃并保温2-4小时,自然冷却至室温,得到纳米限域零价铁@纺锤型多孔碳水处理材料。
步骤(2)中的铁盐为氯化铁、硝酸铁、硫酸铁中的任意一种。
步骤(2)中的铁盐、有机配体、有机溶剂的摩尔比为1:1-1.2:250-280。
步骤(2)中,加入g-C3N4的质量为单独合成金属有机框架质量的10%-70%。
本发明制备的纳米限域零价铁@纺锤型多孔碳材料能够活化单过一硫酸盐、过二硫酸盐和过氧化氢,产生具有强氧化能力的羟基自由基和硫酸根自由基,实现难降解有机污染物的降解。
本发明的有益效果在于:通过引入g-C3N4增强了金属有机框架的限域效应,使得纳米铁更好更稳定的分散在碳框架内,较好的抑制纳米铁的团簇。该纳米限域零价铁@纺锤型多孔碳材料催化活性高,催化剂使用量极低、适应的pH范围广,能够活化氧化剂,形成催化氧化水处理技术,实现水中难降解有机污染物的去除。同时,使用后的催化剂可以通过磁场完成回收利用。
附图说明
图1为纳米限域零价铁@多孔碳材料的XRD图。
图2为纳米限域零价铁@多孔碳材料的透射电镜图。
图3为本发明所制备出的纳米限域零价铁@多孔碳材料(NMC-50)、单纯g-C3N4和单纯金属有机框架热解产物(FexCN-650)的催化性能对比图。
具体实施方式
结合具体实施例对本发明做进一步说明,但本发明不仅仅限于这些实施例。
实施例1制备纳米限域零价铁@纺锤型多孔碳的方法
取10g尿素于一个带盖的氧化铝坩埚中,将其置于马弗炉中,以2℃/min的加热速率从室温升至550℃,并在此温度下保温4h,自然冷却至室温后得到块状g-C3N4,然后将块状g-C3N4研磨成粉末状;将0.674g FeCl3·6H2O、0.415g 2-氨基对苯二甲酸、56mL N,N-二甲基甲酰胺加入到烧杯中,于常温下搅拌至透明溶液;取已合成的g-C3N4取280mg在搅拌下加入溶液中,将其超声30分钟后,再在室温下搅拌30分钟得到悬浮液;将悬浮液转移至带有聚四氟乙烯内胆的高压反应釜,用不锈钢外壳密封后放入烘箱,于443K下,保持24小时;缓慢冷却至室温,将混合物离心分离,得到晶体;将得到的晶体分别用N,N-二甲基甲酰胺和无水乙醇洗涤3次,并离心分离;将分离后所得晶体放入真空干燥箱中,于100℃环境中干燥24小时;将干燥后的晶体置于氮气氛围的管式炉中煅烧,其中氮气流速为100mL/min,升温速率为5℃/min,升至650℃并保温3小时,自然冷却至室温,得到纳米限域零价铁@纺锤型多孔碳材料。
由图1和2可以看出,制备的材料是纺锤型多孔碳材料,颗粒分布均匀,铁元素主要是零价铁的形态存在。
实施例2制备的纳米限域零价铁@纺锤型多孔碳材料作为催化剂去除水中的有机污染物
采用250mL烧杯作为反应器,配置200mL的反应液,用0.1M NaOH调节溶液pH为7.0,其中催化剂投加量为50mg/L,过硫酸钾浓度为0.65mM,有机污染物苯佐卡因的浓度为10mg/L,室温下充分搅拌进行反应1h。
本实施方式的纳米限域零价铁@纺锤型多孔碳材料活化过硫酸盐能够有效氧化降解水体中苯佐卡因,反应1h,苯佐卡因基本完全去除。由图3可知,单独氮化碳活化过硫酸盐降解污染物的效果不佳,单独金属有机框架衍生产物活化过硫酸盐降解效果没有耦合氮化碳衍生产物的催化效果好。这些研究结果说明氮化碳的引入,不仅提高金属有机框架的限域效应,还提高了其催化活性。
以上所述具体实施例仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进或替换,这些改进或替换应该视为本发明的保护范围。
Claims (7)
1.一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法,其特征在于,使用金属有机骨架材料限域零价铁催化材料,通过引入石墨相氮化碳(g-C3N4)将零价铁稳定的分散于纺锤型多孔碳材料中,形成稳定分散的纳米限域零价铁@纺锤型多孔碳水处理材料,能够在室温活化单过一硫酸盐、过二硫酸盐和过氧化氢,形成催化氧化水处理方法。
2.权利要求1中所述的稳定分散的纳米限域零价铁@纺锤型多孔碳水处理材料通过如下制备步骤获得:
(1)取5-20g的尿素于一个带盖的氧化铝坩埚,将其置于马弗炉中,以2℃/min的升温速率升温至520-600℃,保温2-4小时,得到淡黄色块状g-C3N4,然后将块状g-C3N4研磨成粉末状;
(2)将三价铁盐0.3-1.0g和有机配体(2-氨基对苯二甲酸)0.2-0.8g溶于30-70mL的N,N-二甲基甲酰胺中,于常温下搅拌至透明溶液;
(3)取50-300mg步骤(1)合成的g-C3N4在搅拌下加入步骤(1)所得的透明溶液中,将其超声30分钟后,再在室温下搅拌10-30分钟得到悬浮液;
(4)将悬浮液转移至带有聚四氟乙烯内胆的高压反应釜,用不锈钢外壳密封后放入烘箱,于423-443K下,保持12-36小时;缓慢冷却至室温,将混合物离心分离,得到晶体;将得到的晶体分别用N,N-二甲基甲酰胺和无水乙醇洗涤2-3次,并离心分离;
(5)将分离后所得晶体放入真空干燥箱中,于90-110℃干燥10-24小时;将干燥后的晶体置于氮气氛围中煅烧,其中氮气流速为20-150mL/min,升温速率为5℃/min,升至600-700℃并保温2-4小时,自然冷却至室温,得到纳米限域零价铁@纺锤型多孔碳水处理材料。
3.权利要求2所述的稳定分散的纳米限域零价铁@纺锤型多孔碳水处理材料制备步骤,其特征在于,步骤(2)中的铁盐为氯化铁、硝酸铁、硫酸铁中的任意一种。
4.权利要求2所述的稳定分散的纳米限域零价铁@纺锤型多孔碳水处理材料制备步骤,其特征在于,步骤(2)中的铁盐、有机配体、溶剂的摩尔比为1:1-1.2:250-280。
5.权利要求2所述的稳定分散的纳米限域零价铁@纺锤型多孔碳水处理材料制备步骤,其特征在于,步骤(3)中的g-C3N4的质量为单独合成金属有机框架质量的10%-70%。
6.根据权利要求1所述的一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法,其特征在于纳米限域零价铁@纺锤型多孔碳水处理材料能够活化单过一硫酸盐、过二硫酸盐和过氧化氢,产生具有强氧化能力的羟基自由基和硫酸根自由基,实现难降解有机污染物的降解,按照如下步骤实现:
1)纳米限域零价铁@纺锤型多孔碳材料在使用时的投加量为20~300mg/L;
2)单过一硫酸钾的投加量为0.325~1.3mmol/L;
3)过硫酸钾的投加量为0.325~5.0mmol/L;
4)过氧化氢的投加量为0.325~5.0mmol/L;
5)工艺要求进水难降解有机污染物浓度为2.0~10.0mg/L;
6)接触时间为20~60min;
7)反应体系pH范围为3.4~10.0。
7.权利要求书1所述的一种纳米限域零价铁@纺锤型多孔碳催化氧化水处理方法,其特征在于纳米限域零价铁@纺锤型多孔碳水处理材料能够通过磁场快速回收再利用。
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