CN110193380B - 一种以废弃聚苯乙烯为骨料的光催化材料及其制备方法和应用 - Google Patents
一种以废弃聚苯乙烯为骨料的光催化材料及其制备方法和应用 Download PDFInfo
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Abstract
本发明涉及一种以废弃聚苯乙烯为骨料的光催化材料及其制备方法和应用。首先将废弃聚苯乙烯塑料溶于环己烷中,再加入光催化剂并搅拌均匀,最后冻干得到一种泡沫材料。该泡沫材料可用于处理含亚甲基蓝、罗丹明B等有机物的染料废水,具有光催化效率高、制备方法简单、能避免二次污染等诸多优点,应用前景较好。
Description
技术领域
本发明涉及功能材料及环保技术领域,具体涉及一种以废弃聚苯乙烯为骨料的光催化泡沫材料及其制备方法和在有机污水治理方面的应用。
背景技术
随着人类社会的发展以及城市化进程的加快,废弃塑料的收集与处理难以满足日常需要,导致大量被丢弃的废弃塑料进入自然环境中,造成随处可见的白色污染。由于发泡塑料密度较小容易漂浮于水面或随风飘移,造成视觉上的景观破坏。更为严重的是,某些废弃塑料(如聚苯乙烯)无法经由生物分解或光分解进入自然循环,大量随意抛弃的废旧塑料会占用土地资源导致农作物减产,陆地及海洋生物误食废弃塑料还会受伤或死亡。
聚苯乙烯(Polystyrene,简称PS)是一种常见的热塑性塑料,无色无味,具有防水性好、耐腐蚀、隔热保温、电绝缘等优点,主要用于制作泡沫塑料、仪表外壳、透明薄膜、电容器介质层等。废弃聚苯乙烯塑料通常采用焚烧或重新制粒等方式进行回收处理,其中焚烧会产生大量有毒有害气体严重污染大气环境,使得该处理方法逐渐被淘汰。制粒是将废弃聚苯乙烯塑料高温熔融后,再用造粒机将其转化为聚苯乙烯颗粒,以便重新用于制造塑料制品。尤为等人(CN106216357B)公开了一种结合流化床技术、催化技术、吸附技术对废弃聚苯乙烯塑料进行处理的方法,该方法处理效率高但是工艺复杂、所需原料过多,因而回收成本较高。类似的处理方法还包括CN107001520A、CN105315483A、CN103304840A等。
光催化材料是指在光作用下能催化诱导光化学反应的一类半导体催化剂材料,主要包括金属氧化物、金属硫化物等。常见的光催化材料由于颗粒较小容易团聚,严重影响了光催化能力的发挥。目前常规做法是将光催化材料分散在各种基体中,增加其与反应物的反应能力。这些基体主要包括石墨烯、碳纳米管、多孔分子筛等,然而这些基体存在成本较高、制备过程复杂等问题,限制了其应用。目前还没有发现将回收的废弃PS与光催化材料复合的先例。
发明内容
本发明的目的在于解决现有废弃聚苯乙烯塑料回收利用率不高、附加值低、工艺复杂等问题,提供一种以废弃聚苯乙烯为骨料的光催化泡沫材料及其制备方法和应用。通过该方法将不仅实现了废弃聚苯乙烯的回收,而且进一步将其转化成高附加值的功能新材料,形成了回收-再制造-应用的完整产业链,达到了以聚苯乙烯固废治理废水的生态环保效果,具有很好的经济和绿色效益。为实现上述目的,本发明所采用的技术方案如下:
一种以废弃聚苯乙烯为骨料的光催化泡沫材料的制备方法,包括以下步骤:将废弃聚苯乙烯塑料溶于有机溶剂中,再加入光催化剂并搅拌均匀,最后除去有机溶剂即可。
进一步的,废弃聚苯乙烯塑料在溶解前还需进行预处理,所述预处理包括清洗、干燥、粉碎等。
进一步的,所述有机溶剂具体为环己烷。环己烷的凝固点是6℃,使得在低温情况下最初分散在聚苯乙烯-环己烷溶液体系中的光催化材料,仍能有效分散在聚苯乙烯骨架中,从而得到性能优异的泡沫材料。
进一步的,所述光催化剂选自BiOBr、ZnS、Bi2WO6中的任意一种,其粒径为100-500nm。
进一步的,溶解时废弃聚苯乙烯塑料与有机溶剂的质量比为1:16-40,两者混合后需超声4-6h。适当的超声处理能够保证废弃聚苯乙烯充分溶解。
进一步的,废弃聚苯乙烯塑料与光催化剂的质量比为20-50:1。
进一步的,除去有机溶剂的方法为真空冻干,具体过程为:将混合液置于-15℃至-10℃的环境中冷冻并抽真空1-2h。通过冻干升华的方式除去环己烷,既不会引起泡沫的塌陷又便于环己烷的回收再利用。
按照上述方法制得的以废弃聚苯乙烯为骨料的光催化泡沫材料,可用于有机染料废水的处理,通过可见光高效的催化降解废水中所含的亚甲基蓝、罗丹明B等有机物。
与现有技术相比,本发明具有以下有益效果:回收方法简单,不仅完成了PS的回收,而且进一步将其复合制成功能性泡沫材料并用于有机污水处理,实现了回收-再制造-应用全产业链开发,具有以污治污的多重环保效果。该功能材料具有较高的光催化效率,能有效催化降解有机染料废水中的亚甲基蓝、罗丹明B等污染物,不会造成二次污染,工业应用前景较好。
具体实施方式
为使本领域普通技术人员充分理解本发明的技术方案和有益效果,以下结合具体实施例进行进一步说明。
本发明各实施例中所使用的废弃聚苯乙烯塑料需提前洗净干燥并粉碎成小颗粒。
实施例1
常温下将3份(重量份数,下同)废弃聚苯乙烯塑料加入到50份环己烷中,对混合物进行超声处理(4h左右)以便加快溶解过程,最终得到PS-环己烷混合溶液。将0.1份BiOBr(粒径200-500nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-15℃冷冻并抽真空1h左右,得到光催化泡沫材料。升华出来的环己烷收集起来,用于溶解下一批废弃聚苯乙烯塑料。
将制得的光催化泡沫加入到10mg/L的罗丹明B水溶液中,使得光催化泡沫在溶液中的含量为0.4g/L。经过60min的可见光催化降解,罗丹明B的去除率为91.7%。
实施例2
常温下将4份预处理好的废弃聚苯乙烯塑料加入到80份环己烷中,超声4.5h后得到PS-环己烷混合溶液。将0.1份ZnS(粒径100-300nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-10℃冷冻并抽真空1.5h左右,得到光催化泡沫材料。期间回收环己烷备用。
将制得的光催化泡沫加入到20mg/L的亚甲基蓝水溶液中,使得光催化泡沫在溶液中的含量为0.5mg/L。经过60min的可见光催化降解,亚甲基蓝的去除率为94.6%。
实施例3
常温下将5份预处理好的废弃聚苯乙烯塑料加入到180份环己烷中,超声5h后得到PS-环己烷混合溶液。将0.1份Bi2WO6(粒径200-500nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-12℃冷冻并抽真空2h左右,得到光催化泡沫材料。期间回收环己烷备用。
将制得的光催化泡沫加入到25mg/L的亚甲基蓝水溶液中,使得光催化泡沫在溶液中的含量为0.4mg/L。经过60min的可见光催化降解,亚甲基蓝的去除率为83.2%。
实施例4
常温下将6份预处理好的废弃聚苯乙烯塑料加入到100份环己烷中,超声6h后得到PS-环己烷混合溶液。将0.2份BiOBr(粒径200-500nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-10℃冷冻并抽真空1h左右,得到光催化泡沫材料。期间回收环己烷备用。
将制得的光催化泡沫加入到25mg/L的罗丹明B水溶液中,使得光催化泡沫在溶液中的含量为0.5mg/L。经过60min的可见光催化降解,罗丹明B的去除率为93.1%。
实施例5
常温下将3份预处理好的废弃聚苯乙烯塑料加入到90份环己烷中,超声4.5h后得到PS-环己烷混合溶液。将0.1份ZnS(粒径100-300nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-15℃冷冻并抽真空2h左右,得到光催化泡沫材料。期间回收环己烷备用。
将制得的光催化泡沫加入到30mg/L的亚甲基蓝水溶液中,使得光催化泡沫在溶液中的含量为0.6mg/L。经过60min的可见光催化降解,亚甲基蓝的去除率为92.6%。
实施例6
常温下将5份预处理好的废弃聚苯乙烯塑料加入到125份环己烷中,超声5h后得到PS-环己烷混合溶液。将0.1份Bi2WO6(粒径200-500nm)加入到上述PS-环己烷混合溶液中,接着将混合液转移至冻干机中,在-10℃冷冻并抽真空1h左右,得到光催化泡沫材料。期间回收环己烷备用。
将制得的光催化泡沫加入到40mg/L的亚甲基蓝水溶液中,使得光催化泡沫在溶液中的含量为0.5mg/L。经过120min的可见光催化降解,亚甲基蓝的去除率为81.7%。
Claims (8)
1.一种以废弃聚苯乙烯为骨料的光催化材料的制备方法,其特征在于包括以下步骤:按照1:16-40的质量比将废弃聚苯乙烯塑料溶于有机溶剂中,再加入光催化剂并搅拌均匀,最后将混合液置于-15℃至-10℃的环境中冷冻,接着抽真空1-2h除去有机溶剂即可;所述有机溶剂具体为环己烷。
2.如权利要求1所述的制备方法,其特征在于:废弃聚苯乙烯塑料在溶解前还需进行预处理,所述预处理包括清洗、干燥、粉碎。
3.如权利要求1所述的制备方法,其特征在于:所述光催化剂选自BiOBr、ZnS、Bi2WO6中的任意一种,光催化剂的粒径控制在100nm -500nm。
4.如权利要求1所述的制备方法,其特征在于:溶解时废弃聚苯乙烯塑料与有机溶剂混合后超声4-6h。
5.如权利要求1所述的制备方法,其特征在于:废弃聚苯乙烯塑料与光催化剂的质量比为20-50:1。
6.如权利要求1所述的制备方法,其特征在于:所得光催化材料中含有气孔,属于泡沫材料。
7.一种以废弃聚苯乙烯为骨料的光催化泡沫材料,其特征在于该材料按照权利要求1-5中任一种方法制备得到。
8.权利要求7所述以废弃聚苯乙烯为骨料的光催化泡沫材料在处理含亚甲基蓝或罗丹明B的染料废水中的应用。
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