CN107812515A - 一种红砖砂负载二氧化钛制备复合光催化剂的方法 - Google Patents
一种红砖砂负载二氧化钛制备复合光催化剂的方法 Download PDFInfo
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Abstract
本发明涉及一种红砖砂负载二氧化钛制备复合光催化剂的方法,包括如下步骤:(1)先将纳米二氧化钛P25溶解于水中,再在超声波振荡作用下,边振荡边搅拌制成相对稳定的二氧化钛溶胶体,其中纳米二氧化钛占据水的质量浓度为1%;(2)边搅拌稳定的溶胶体,边慢慢加入表面纯净的红砖砂颗粒,使红砖砂与二氧化钛溶胶充分接触,得到混合物A;(3)然后将混合物A溶胶陈化24h,使得溶胶体中红砖砂颗粒充分吸收纳米二氧化钛;(4)最后经过洗涤,干燥和500‑800℃热处理得到红砖砂负载纳米二氧化钛的复合光催化剂。本发明可以大大提高光催化剂对氮氧化合物和其他有机污染物质的光催化降解能力,具有显著的协同作用。
Description
技术领域
本发明涉及一种红砖砂负载二氧化钛制备复合光催化剂的方法,属于无机材料制备方法技术领域。
背景技术
红砖砂是由建筑废弃物中的红砖经过破碎筛分制得的颗粒状建筑废弃物。在全国每年产生的高达15亿吨(2014年度)的建筑废弃物中,约70%是红砖,即砖渣每年产生约10.5亿吨。大量的建筑废弃物砖渣如若处置不当,不但会大量侵占宝贵的土地资源(每填埋1万吨建筑废弃物约占用土地1亩),而且还会极大的污染当地水源。对人体的健康和社会的可持续发展造成极大危害。然后,目前对于建筑废弃物红砖的利用效率和利用层级都很低。这一方面造成红砖利用附加值很低;而另一方面导致红砖利用成本高昂。实际上,如若将回收的砖渣重新用来制备红砖,其使用成本甚至比市场上的普通红砖更高。所以,要想大规模的再利用建筑废弃物中的红砖,必须切实有效提高红砖产品的附加值,从而赢得市场竞争。
与此同时,空气污染中的一个重要组成部分即使氮氧化物。这些氮氧化合物主要来源于人类对矿物质燃料的利用和机动车排放。其主要包括一氧化氮和二氧化氮。这些氮氧化合物会产生一些列广为人知的负面影响,比如说对流层臭氧污染,酸雨,全球变暖,人类呼吸系统疾病等。所以,人们尝试利用光催化剂的光催化效果来有效去除氮氧化合物。尽管光催化剂有很多种,二氧化钛被证明的比较好的且被广泛应用。因为它具有化学性质稳定等优点。而纳米相的二氧化钛因为其较大的比表面积被证明有极高的催化活性。所以,纳米相二氧化钛被广泛研究作为光催化剂来缓解城市污染尤其是氮氧化合物污染问题。但是,纳米相的二氧化钛过于细小,这严重限制了它的使用范围和使用效果。
因此,如果把纳米相的二氧化钛负载于红砖砂表面,利用红砖砂的多孔结构将纳米二氧化钛颗粒进行固定,可以有效降低催化剂颗粒的流失率。红砖砂的强吸附性以及大比表面积可以有效提高光催化剂与氮氧化合物污染物质的接触面积且吸附更多的有机污染物质于其表面。然后,通过光催化作用,污染物质被降解为无污染的小分子,最终随雨水等被除去。目前,已有报道利用化学自组装技术制备红砖砂负载纳米二氧化钛的复合光催化剂。而本专利技术则利用溶胶-凝胶法来制备利用红砖砂负载纳米二氧化钛的复合光催化剂。
发明内容
本发明的目的是提供一种红砖砂负载二氧化钛制备复合光催化剂的方法。
为了实现上述目的,本发明的技术方案如下。
一种红砖砂负载二氧化钛制备复合光催化剂的方法,包括如下步骤:
(1)先将纳米二氧化钛P25溶解于水中,再在超声波振荡作用下,边振荡边搅拌制成相对稳定的二氧化钛溶胶体,其中纳米二氧化钛占据水的质量浓度为1%;
(2)边搅拌稳定的溶胶体,边慢慢加入表面纯净的红砖砂颗粒,使红砖砂与二氧化钛溶胶充分接触,得到混合物A;
(3)然后将混合物A溶胶陈化24h,使得溶胶体中红砖砂颗粒充分吸收纳米二氧化钛;
(4)最后经过洗涤,干燥和500-800℃热处理得到红砖砂负载纳米二氧化钛的复合光催化剂。
进一步地,步骤(2)中,红砖砂和二氧化钛溶胶的质量比为0.8:1
进一步地,步骤(4)中,干燥方式为采用普通烘箱干燥或真空干燥。
进一步地,步骤(2)中,红砖砂级配为0.6-1.18mm和1.18-2.36mm。
该发明的有益效果在于:本发明采用Degussa P25作为催化剂,建筑废弃物红砖砂为载体,制备的复合光催化剂材料尺寸在0.6-2.36mm,纳米颗粒均匀负载于红砖砂表面。既能够将建筑废弃物红砖砂高附加值重新利用,又解决了建筑废弃物红砖的储存及其处理问题。此外,由于红砖砂的多孔性和较强的吸附能力,可以大大提高光催化剂对氮氧化合物和其他有机污染物质的光催化降解能力,具有显著的协同作用。特别的,本发明原材料来源容易,其中建筑废弃物红砖可以从专门的建筑物资源化利用工厂获得而纳米二氧化钛可以很方便的在市场购买到,成本低制作方便。
具体实施方式
下面结合实施例对本发明的具体实施方式进行描述,以便更好的理解本发明。
光催化剂对氮氧化合物的降解效率的测定遵循特定的计算公式:
其中,θ表示催化效率即氮氧化合物降解率(μmol/hm2);表示测试样品降解的氮氧化合物(一氧化氮和二氧化氮的和)的量;[NOx]0表示氮氧化合物的进入浓度(ppm);[NOx]表示氮氧化合物的排出浓度(ppm);t表示催化反应发生的时间(min);f表示气体在标准状态(0℃,1.013kPa)的流速(L/min);A表示样品参与反应的面积(m×m)。
以氮氧化合物(NO+NO2)为目标污染物,通过氮氧化合物降解效率测试仪测得降解效率。首先,将反应器的进气口的一端通入标准一氧化氮气体而另一端通入零级空气。其中一氧化氮的来源是由氮气作为平衡气体的压缩空气罐。反应器中的湿度可以通过将零级空气通过水浴进行控制,本测试中湿度控制为10%,另外,反应器中的一氧化氮的初始浓度控制为1000ppb,流速通过流速控制器控制为6L每分钟。经过约半个小时,反应器中的一氧化氮浓度达到均衡。这个时候,打开反应器上方的紫外线灯激活复合光催化剂进而激活光催化反应。在反应过程中,一氧化氮分析仪始终测量着反应器中的一氧化氮的浓度。一小时后,关闭反应器上方的紫外线灯结束光催化反应,但继续通入零级空气半个小时。然后由于反应器联接的计算机导出数据通过计算公式计算氮氧化合物的降解效率。
实施例1
本实施例中的红砖砂负载二氧化钛制备复合光催化剂的方法,具体步骤为:将1g纳米二氧化钛溶于100毫升水中制成溶胶,经超声波振荡1个小时后,边搅拌边加入80g级配为1.18-2.36mm的红砖砂,陈化24小时,清洗,500℃烘干后制得复合光催化剂。其对氮氧化合物的降解率可以达到219.9。
实施例2
本实施例中的红砖砂负载二氧化钛制备复合光催化剂的方法,具体步骤为:将1g纳米二氧化钛溶于100毫升水中制成溶胶,经超声波振荡1个小时后,边搅拌边加入80g级配为0.6-1.18mm的红砖砂,陈化24小时,清洗,500℃烘干后制得复合光催化剂。其对氮氧化合物的降解率可以达到222.8。
以上所述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和润饰,这些改进和润饰也视为本发明的保护范围。
Claims (4)
1.一种红砖砂负载二氧化钛制备复合光催化剂的方法,其特征在于:包括如下步骤:
(1)先将纳米二氧化钛P25溶解于水中,再在超声波振荡作用下,边振荡边搅拌制成相对稳定的二氧化钛溶胶体,其中纳米二氧化钛占据水的质量浓度为1%;
(2)边搅拌稳定的溶胶体,边慢慢加入表面纯净的红砖砂颗粒,使红砖砂与二氧化钛溶胶充分接触,得到混合物A;
(3)然后将混合物A溶胶陈化24h,使得溶胶体中红砖砂颗粒充分吸收纳米二氧化钛;
(4)最后经过洗涤,干燥和500-800℃热处理得到红砖砂负载纳米二氧化钛的复合光催化剂。
2.根据权利要求1所述的红砖砂负载二氧化钛制备复合光催化剂的方法,其特征在于:所述步骤(2)中,红砖砂和二氧化钛溶胶的质量比为0.8:1。
3.根据权利要求1所述的红砖砂负载二氧化钛制备复合光催化剂的方法,其特征在于:所述步骤(4)中,干燥方式为采用普通烘箱干燥或真空干燥。
4.根据权利要求1所述的红砖砂负载二氧化钛制备复合光催化剂的方法,其特征在于:所述步骤(2)中,红砖砂级配为0.6-1.18mm和1.18-2.36mm。
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