CN108654571A - 一种石墨烯/涤纶复合纤维及其制备方法和应用 - Google Patents
一种石墨烯/涤纶复合纤维及其制备方法和应用 Download PDFInfo
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Abstract
本发明提供了一种石墨烯/涤纶复合纤维及其制备方法和应用,通过以下步骤的方法制备获得:1)将浓度为1‑2mg/mL氧化石墨烯混悬液经化学还原得到黑色混悬液;2)将涤纶纤维放入上述黑色混悬液中,涤纶纤维和黑色混悬液的质量比为1:20‑40,浸泡2‑3d后;将涤纶纤维取出清洗,晾干,得到石墨烯/涤纶复合纤维。本发明复合纤维稳定性高,可回收利用,合成方法简单,染料脱色过程简单,运行成本低,在染料废水脱色领域具有良好的应用前景。
Description
技术领域
本发明涉及染料废水处理材料,具体是一种石墨烯/涤纶复合纤维及其制备方法,以及在染料废水处理中的应用。
背景技术
染料废水是国内外公认的较难处理的工业废水之一,具有排放量大,成分复杂,处理难度大的特点。此外染料废水还具有色度高、有机物含量高、难生物降解、多变化等特点。其中含有的偶氮染料更是具有致癌的效果,严重污染水体,危害人们的健康。即使废水中残存的染料浓度很低,排入水体也会造成水体透光率和水体中气体溶解度的降低,影响水中各种生物的生长,从而破坏水体纯度和水生生物的食物链,最终将导致水体生态系统的破坏。加之纺织品的产量和质量有了大幅度的提高,染料正朝着抗光解、抗氧化和抗生物降解的方向发展。所有这一切都导致了染料废水的治理越来越难,染料废水对环境的污染越来越严重。
现有染料废水的处理方法有生物化学法和物理化学法,其中生物化学法主要包含好氧及厌氧两种方法,物理化学法则主要包含吸附和降解两种方法。国内对染料废水以生物处理为主,但生物处理法对色度的去除率不高。染料分子细微的结构变化会影响脱色率,而不同的微生物对不同结构的染料去除率差别较大,染料浓度对脱色率也有一定影响,高浓度染料(染料本身有较强的生物毒性)会抑制微生物活性,影响脱色效果。因此,对于染料废水通常会用物理吸附的方法来降低色度。吸附法是将多孔性的固体物质与废水混合,把水中的污染物质吸附到固体外表,使污染物质得到去除的一种方法。常用的吸附材料有天然矿物、蔗糖、煤渣、甲壳质、活性炭、蛋白质等。其中活性炭的应用较其他材料来说更普遍,但是在应用中发现活性炭吸附具有对疏水性染料去除困难、脱附效果差等缺点。其他的一些天然吸附物质虽然具有容易获得、成本低廉、吸附过程简便易行、应用性高等优点,但是吸附效果往往达不到要求。因此,寻找有高化学稳定性和高比表面积的新型碳材料成为研究的热点。石墨烯具有较大的比表面积(2630m2·g-1),这使其在吸附方面的应用具备了巨大的潜力和天然的优势。但是石墨烯片层在水中容易产生不可逆的凝聚,使其比表面积大打折扣。因此需要找到防止石墨烯在水中凝聚的方法,最大程度地发挥其吸附性能。
发明内容
本发明的目的在于针对现有技术存在的问题,提供一种用于处理染料废水的石墨烯/涤纶复合纤维及其制备方法和应用,所述复合纤维能够防止石墨烯在水中聚集,发挥其大比表面积的优势,具备优良的染料吸附特性,同时克服石墨烯材料在吸附染料后难于与水分离的问题。
本发明提供的一种用于处理染料废水的石墨烯/涤纶复合纤维,具体通过如下步骤的方法制备获得:
1)将浓度为1-2mg/mL氧化石墨烯混悬液经化学还原得到黑色混悬液;
2)将涤纶纤维放入上述黑色混悬液中,涤纶纤维和黑色混悬液的质量比为1:20-40,浸泡2-3d后;将涤纶纤维取出清洗,晾干,得到石墨烯/涤纶复合纤维。
步骤1)中所述氧化石墨烯混悬液化学还原的条件可以是:
将氧化石墨烯混悬液置于容器中,搅拌3~5min,搅拌过程中加入氨水和水合肼;其中所述的氧化石墨烯、氨水、水合肼、水的质量比为1:9-11:3.5-4.5:850-1100(优选1:10:4:1000),60℃水浴3.5h,得黑色混悬液。
步骤2)中涤纶纤维和黑色混悬液的质量比为1:30-35,浸泡时间2d。
本发明复合纤维用于处理染料溶液的方法:
将复合纤维置于染料溶液中,静置,用紫外-可见光谱检测溶液的色度变化,从紫外-可见光谱(见图1-4)中染料的吸收峰变化来衡量并计算吸附率。
与现有技术相比本发明的优点:
本发明采用涤纶纤维与石墨烯结合而构成复合纤维,具有对染料废水中染料吸附性强、稳定性高、吸附剂与水易分离的特点。涤纶纤维是一种合成纤维,其特点是亲水性差、染色性差、耐化学试剂,与石墨烯构成复合纤维材料,为石墨烯提供支撑,使石墨烯牢固地附着在上面,既防止石墨烯的凝聚,又有利于在吸附染料之后很轻易地与水分离。极性极小的涤纶分子链上无特定的染色基团,染料分子不易进入纤维,可以保证发挥石墨烯吸附染料的作用,同时使染料容易脱附,达到吸附剂回收再利用的目的。
附图说明
图1石墨烯/涤纶复合纤维处理碱性品红(FBI)溶液前后的紫外-可见光谱图
图2石墨烯/涤纶复合纤维处理孔雀石绿(MG)溶液前后的紫外-可见光谱图
图3石墨烯/涤纶复合纤维处理刚果红(CR)溶液前后的紫外-可见光谱图
图4吸附后回收的石墨烯/涤纶复合纤维处理孔雀石绿(MG)溶液前后的紫外-可见光谱图。
具体实施方式
实施例1
石墨烯/涤纶复合纤维的制备:
将0.45mL 25%的氨水和0.18mL 80%的水合肼分别加入45mL浓度为1mg/mL的氧化石墨烯混悬液中,混匀3~5min。60℃水浴3.5h,得黑色混悬液。冷却至室温后,将约0.15g已清洗晾干的涤纶纤维浸泡在5mL制备好的黑色混悬液中2d后。将涤纶纤维取出清洗,晾干,得到复合纤维。
实施例2
石墨烯/涤纶复合纤维与碱性品红(FBI)溶液的吸附脱色:
在常温下,配置5mL浓度为0.02mg/mL的碱性品红(FBI)溶液,加入一块复合纤维,震荡30min。取剩余溶液测定其吸光度(见图1)。根据所得数据计算FBI的脱色率为99.08%。
实施例3
石墨烯/涤纶复合纤维与孔雀石绿(MG)溶液的吸附脱色:
在常温下,配置5mL浓度为0.02mg/mL的孔雀石绿(MG)溶液,加入一块复合纤维,震荡30min。取剩余溶液测定其吸光度(见图2)。根据所得数据计算MG的脱色率为79.67%。
实施例4
石墨烯/涤纶复合纤维与刚果红(CR)溶液的吸附脱色:
在常温下,配置5mL浓度为0.02mg/mL的刚果红(CR)溶液,加入一块复合纤维,震荡30min。取剩余溶液测定其吸光度(见图3)。根据所得数据计算CR的脱色率为55.96%。
实施例5
脱吸附的石墨烯/涤纶复合纤维与孔雀石绿(MG)溶液的吸附脱色:
在常温下,配置5mL浓度为0.02mg/mL的孔雀石绿(MG)溶液,加入一块使用一次后脱吸附的石墨烯/涤纶复合纤维,震荡30min。取剩余溶液测定其吸光度(见图4)。根据所得数据计算MG的二次脱色率为67.26%。
Claims (7)
1.一种用于处理染料废水的石墨烯/涤纶复合纤维,其特征在于,通过包括如下步骤的方法制备获得:
1)将浓度为1-2mg/mL氧化石墨烯混悬液经化学还原得到黑色混悬液;
2)将涤纶纤维放入上述黑色混悬液中,涤纶纤维和黑色混悬液的质量比为1:20-40,浸泡2-3d后;将涤纶纤维取出清洗,晾干,得到石墨烯/涤纶复合纤维。
2.如权利要求1所述的一种用于处理染料废水的石墨烯/涤纶复合纤维,其特征在于,步骤2)中涤纶纤维和黑色混悬液的质量比为1:30-35。
3.如权利要求1所述的一种用于处理染料废水的石墨烯/涤纶复合纤维,其特征在于,步骤2)中浸泡时间2d。
4.如权利要求1、2或3所述的一种用于处理染料废水的石墨烯/涤纶复合纤维,其特征在于,步骤1)中所述氧化石墨烯混悬液化学还原的条件是:将氧化石墨烯混悬液置于容器中,搅拌3~5min,搅拌过程中加入氨水和水合肼;其中所述的氧化石墨烯、氨水、水合肼、水的质量比为1:9-11:3.5-4.5:850-1100,60℃水浴3.5h,得黑色混悬液。
5.如权利要求4所述的一种用于处理染料废水的石墨烯/涤纶复合纤维,其特征在于,所述的氧化石墨烯、氨水、水合肼、水的质量比为1:10:4:1000。
6.如权利要求1、2或3所述石墨烯/涤纶复合纤维用于染料废水的脱色。
7.如权利要求4所述石墨烯/涤纶复合纤维用于染料废水的脱色。
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KR20150004309A (ko) * | 2014-12-12 | 2015-01-12 | 주식회사 동양탄소 | 탄화 폴리에스테르 부직포에 흑연유사구조(석탄화도: 94이상)의 한국산무연탄계분말활성탄(SBET=1,760m2/g이상의 고비표면적)을 퀴놀린가용성 등방성피치바인더에 의해 첨착, 재 탄화를 통해, 새로운 열안정성 흡착필터"a novel thermostable adsorption filter"의 제조방법 |
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CN105903494A (zh) * | 2016-06-06 | 2016-08-31 | 东华大学 | 一种纺织纤维/石墨烯/NaTaO3复合环境催化材料的制备方法 |
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