CN107837799A - 一种降解含酚废水的磁性强化粉煤灰印迹光催化剂 - Google Patents
一种降解含酚废水的磁性强化粉煤灰印迹光催化剂 Download PDFInfo
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Abstract
本发明属于固废回收利用领域,具体涉及一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,解决了一般光催化剂选择性差和难于分离回收的难题,主要内容包括:首先将粉煤灰进行预处理与活化,接着将活化后的粉煤灰进行磁化,然后将二氧化钛负载在磁性粉煤灰上,最后通过分子印迹技术来制备分子印迹型的二氧化钛/粉煤灰酚类催化剂。本发明利用廉价粉煤灰优异的吸附性与稳定的化学性,制备了光降解性能好、易于回收、选择性优异的光催化材料,能快速地处理含酚废水,从而实现“以废治废”的目的。
Description
技术领域
本发明属于固废回收利用领域,具体涉及一种降解含酚废水的磁性强化粉煤灰印迹光催化剂。
背景技术
随着工业化社会的高速发展,有机污染物对水资源造成的危害日益严峻,其中酚类化合物是一类重要的有毒有害物质,早在20世纪70年代美国环保署就将11种酚类化合物列为129种环境优先污染物之中。制药、印染、造纸、农药等工农业生产过程的废水排放中含有大量的酚类化合物,如果这类废水未经处理直接排入水体将会对环境和人体健康产生极大的危害。
光催化降解法利用的是辐射或者光催化剂在反应体系中产生活性极强的自由基,然后通过该自由基与酚类污染物发生加合、取代、电子转移等过程,使酚类污染物全部降解为无机物。常见的光催化剂通常是金属氧化物或者为硫化物的半导体材料,如WO3、ZnO、CdS、ZnS、TiO2等,其中由于TiO2具有成本低、无毒性、强光稳定性、氧化效率高等优点,它已成为目前最受欢迎的半导体光催化剂。但是在实际水处理过程中,很难选择性的降解某种污染物,而且光催化材料难以重复使用。为了克服这些缺点,众多研究者将TiO2负载在某种载体上,达到了水处理过程中固液分离的目的。
近年来,常见的载体有活性炭纤维、玻璃、陶瓷、粉煤灰等。其中粉煤灰是发电厂排出的固体废弃物,在我国产量非常巨大,粉煤灰的存放不仅占用大量的土地,而且会对环境造成严重的污染。随着对粉煤灰的不断研究,发现可以将光催化剂如二氧化钛负载在粉煤灰的表面实现水中有机物的降解,如申请号为200810131397.2的“一种粉煤灰负载氧化钛光催化材料的制备方法”中以燃煤电厂排放的粉煤灰为载体,负载氧化钛以降解模拟的甲基橙废水;专利号为201110197608.4的“一种选择性降解的分子印迹修饰复合光催化剂的制备方法”中以凝胶溶胶技术制备了能选择性降解环丙沙星的TiO2/漂珠复合光催化剂。但这两种方法制备的光催化剂均存在活性不高、选择性差、分离回收难、成本较高等问题。
发明内容
本发明的目的是提供一种降解含酚废水的磁性强化粉煤灰印迹光催化剂。
为达到上述目的,本发明采用的技术方案是:
一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,该光催化剂由以下方法制得:
(1)选料:粉煤灰预处理并活化;
(2)制备磁性粉煤灰:取步骤1)中的0.5~1g活化粉煤灰于20~30min内超声分散在30~50mL蒸馏水中,接着加入3~6mmol含有Fe3+的铁盐并在常温下搅拌45~60min,然后在氮气保护下于60~80℃条件下加入1.5~4mmol的含有Fe2+的亚铁盐并搅拌反应60~90min,再加入氨水并搅拌1~3h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;
(3)磁性粉煤灰负载TiO2复合光催化剂:将体积比为1:2~5的钛醇盐和有机醇倒入三口烧瓶中并搅拌30~60min,然后取钛醇盐体积的1/10~4/5的酸并慢慢滴加到三口烧瓶中继续搅拌,直至生成均匀透明的溶胶停止加酸;将步骤2)得到的磁性粉煤灰0.8~1.3g加入到溶胶中,搅拌直至磁性粉煤灰均匀地分散于湿溶胶中,然后将湿凝胶在50~80℃下干燥24~36h,得到了无定形的干凝胶粉体;然后在400~600℃下煅烧,即可得到磁性粉煤灰负载TiO2复合光催化剂;
(4)分子印迹型磁性粉煤灰负载TiO2光催化剂:在60~80℃下将摩尔比为1:4~8的模板分子和功能单体加入到30~60mL的无水乙醇内并搅拌直至溶解,然后加入步骤3)得到的磁性粉煤灰负载TiO2并超声分散15~30min,然后再加入交联剂和引发剂并微波加热得产物B,再用无水乙醇和乙酸的混合溶液洗涤产物B直至滤液中未检测到模板分子,再用蒸馏水洗涤直至滤液呈现中性,最后用无水乙醇洗涤3~5次并在50~80℃的烘箱中干燥24~48h。
进一步的,所述步骤(1)中粉煤灰的预处理包括:先将取自电厂的粉煤灰过100~200目筛处理,再用去离子水淘洗3 ~ 4次,并去除上部浑浊的液体,然后干燥备用;将预处理过的粉煤灰浸入1~3mol/L的盐酸或5%~10%的硝酸溶液中于50~60℃下搅拌6~8h进行活化处理,活化处理以后过滤洗涤至中性,干燥备用。
进一步的,所述步骤(2)中Fe2+的摩尔量与粉煤灰的质量之比为1mmol:(0.3~0.5)g。
进一步的,所述步骤(3)中钛醇盐为四异丙醇钛酸酯或钛酸四丁酯,有机醇为甲醇、乙醇、正丙醇中的一种,酸为有机酸或无机酸。
进一步的,所述步骤(3)中磁性粉煤灰干凝胶粉体煅烧时的升温速率为5~8℃/min,保温时间2~4h。
进一步的,所述步骤(4)中的模板分子为苯酚、对硝基苯酚、邻苯二酚中的一种,功能单体为γ-巯丙基三甲氧基硅烷,交联剂为三羟甲基丙烷三甲丙烯酸酯,引发剂为偶氮二异丁腈。
进一步的,所述步骤(4)中模板分子和磁性粉煤灰负载TiO2的质量比是1:10~20。
进一步的,所述步骤(4)中交联剂体积和引发剂的质量比是1mL:(5~20)mg。
进一步的,所述步骤(4)中微波加热的功率是50~100W,微波加热的时间是10~60min。
本发明具有的优点是:本发明利用廉价粉煤灰优异的吸附性与稳定的化学性,制备了光降解性能好、易于回收、选择性优异的光催化材料,能快速地处理含酚废水,从而实现“以废治废”的目的。
具体实施方式
实施例1
一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,由以下方法制成:
首先选料:先将取自电厂的粉煤灰过100~200目筛处理,再用去离子水淘洗3 ~ 4次,并去除上部浑浊的液体,然后干燥备用;将预处理过的粉煤灰浸入1mol/L的盐酸或5%的硝酸溶液中于50℃下搅拌6h进行活化处理,活化处理后过滤洗涤至中性,干燥备用;然后制备磁性粉煤灰:取活化粉煤灰0.5g于30min内超声分散在40mL蒸馏水中,接着加入3mmol含有Fe3+的铁盐并在常温下搅拌45~60min,然后在氮气保护下于60~80℃条件下加入1.5mmol的含有Fe2+的亚铁盐并搅拌反应60~90min,再加入氨水并搅拌1~3h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;再加入氨水并搅拌1h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;然后将磁性粉煤灰负载TiO2复合光催化剂:将体积比为1:2的钛醇盐和有机醇倒入三口烧瓶中并搅拌30min,然后取钛醇盐体积的1/10的酸慢慢滴加到三口烧瓶中继续搅拌,直至生成均匀透明的溶胶停止加酸,其中,钛醇盐为四异丙醇钛酸酯或钛酸四丁酯,有机醇为甲醇、乙醇、正丙醇中的一种,酸为有机酸或无机酸;再将0.8g磁性粉煤灰加入到溶胶中,搅拌直至磁性粉煤灰均匀地分散于湿溶胶中,然后将湿凝胶在50℃下干燥24h,得到了无定形的干凝胶粉体;然后在400℃下煅烧,煅烧时,升温速率为5℃/min,保温时间2h,即可得到磁性粉煤灰负载TiO2复合光催化剂;最后,制作分子印迹型磁性粉煤灰负载TiO2光催化剂:在60℃下将摩尔比为1:4的模板分子苯酚和功能单体γ-巯丙基三甲氧基硅烷加入到30mL的无水乙醇内并搅拌直至溶解,然后加入磁性粉煤灰负载TiO2复合光催化剂并超声分散15min,然后再加入交联剂三羟甲基丙烷三甲丙烯酸酯和引发剂偶氮二异丁腈并在50W的功率下微波加热10min得产物B,再用无水乙醇和乙酸的混合溶液洗涤产物B直至滤液中未检测到模板分子,再用蒸馏水洗涤直至中性,最后用无水乙醇洗涤3次并在50℃的烘箱中干燥24h,其中,模板分子和磁性粉煤灰负载TiO2的质量比是1:10,交联剂体积和引发剂的质量比是1mL:5mg,即得到1号分子印迹型磁性粉煤灰负载TiO2光催化剂。
光催化反应的温度为30℃,在10mL 10mg/L的苯酚溶液中加入1号分子印迹型磁性粉煤灰负载TiO2光催化剂0.5g并将整个反应装置于50W的紫外灯下分别照射5、10、20、30、40和60min,然后用高效液相色谱检测光降解前后溶液中的浓度,并计算降解率。结果发现分别照射5、10、20、30、40和60min后,苯酚的降解率分别是45.7%、68.9%、88.3%、96.5%、96.9%和96.3%。
实施例2
一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,由以下方法制成:
首先选料:先将取自电厂的粉煤灰过100~200目筛处理,再用去离子水淘洗3 ~ 4次,并去除上部浑浊的液体,然后干燥备用;将预处理过的粉煤灰浸入3mol/L的盐酸或10%的硝酸溶液中于60℃下搅拌8h进行活化处理,活化处理以后过滤洗涤至中性,干燥备用;然后制备磁性粉煤灰:取活化粉煤灰1g于30min内超声分散在50mL蒸馏水中,接着加入3mmol含有Fe3+的铁盐并在常温下搅拌45~60min,然后在氮气保护下于60~80℃条件下加入2mmol的含有Fe2+的铁盐并搅拌反应60~90min,再加入氨水并搅拌3h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;然后将磁性粉煤灰负载TiO2复合光催化剂:将体积比为1:5的钛醇盐和有机醇倒入三口烧瓶中并搅拌60min,然后取钛醇盐体积的4/5的酸慢慢滴加到三口烧瓶中继续搅拌,直至生成均匀透明的溶胶停止加酸,其中,钛醇盐为四异丙醇钛酸酯或钛酸四丁酯,有机醇为甲醇、乙醇、正丙醇中的一种,酸为有机酸或无机酸;再将1.3g磁性粉煤灰加入到溶胶中,搅拌直至磁性粉煤灰均匀地分散于湿溶胶中,然后将湿凝胶在80℃下干燥36h,得到了无定形的干凝胶粉体;然后在600℃下煅烧,煅烧时,升温速率为8℃/min,保温时间4h,即可得到磁性粉煤灰负载TiO2复合光催化剂;最后,制备分子印迹型磁性粉煤灰负载TiO2光催化剂:在80℃下将摩尔比为1:8的模板分子对硝基苯酚和功能单体γ-巯丙基三甲氧基硅烷加入到60mL的无水乙醇内并搅拌直至溶解,然后加入磁性粉煤灰负载TiO2复合光催化剂并超声分散30min,然后再加入交联剂三羟甲基丙烷三甲丙烯酸酯和引发剂偶氮二异丁腈并在100W的功率下微波加热60min得产物B,再用无水乙醇和乙酸的混合溶液洗涤产物B直至滤液中未检测到模板分子,再用蒸馏水洗涤直至中性,最后用无水乙醇洗涤5次并在80℃的烘箱中干燥48h,其中,模板分子和磁性粉煤灰负载TiO2的质量比是1:20,交联剂体积和引发剂的质量比是1mL:20mg,即得到2号分子印迹型磁性粉煤灰负载TiO2光催化剂。
光催化反应的温度为30℃,在10mL 10mg/L的苯酚溶液、10mL 10mg/L对硝基苯酚、10mL 10mg/L邻苯酚溶液中分别加入2号分子印迹型磁性粉煤灰负载TiO2光催化剂0.5g并将整个反应装置于50W的紫外灯下照射40 min,然后用高效液相色谱检测光降解前后溶液中的浓度,并计算降解率。结果发现苯酚、对硝基苯酚和邻苯酚的降解率分别是97.1%、68.6%和73.7%。
实施例3
一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,由以下方法制成:
首先选料:先将取自电厂的粉煤灰过100~200目筛处理,再用去离子水淘洗3 ~ 4次,并去除上部浑浊的液体,然后干燥备用;将预处理过的粉煤灰浸入2mol/L的盐酸或8%的硝酸溶液中于55℃下搅拌7h进行活化处理,活化处理后过滤洗涤至中性,干燥备用;然后制备磁性粉煤灰:取活化粉煤灰0.8g于30min内超声分散在30mL蒸馏水中,接着加入3mmol含有Fe3+的铁盐并在常温下搅拌45~60min,然后在氮气保护下于60~80℃条件下加入2mmol的含有Fe2+的铁盐并搅拌反应60~90min,再加入氨水并搅拌2h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;然后将磁性粉煤灰负载TiO2复合光催化剂:将体积比为1:4的钛醇盐和有机醇倒入三口烧瓶中并搅拌50min,然后取钛醇盐体积的1/5的的酸并慢慢滴加到三口烧瓶中继续搅拌,直至生成均匀透明的溶胶停止加酸,其中,钛醇盐为四异丙醇钛酸酯或钛酸四丁酯,有机醇为甲醇、乙醇、正丙醇中的一种,酸为有机酸或无机酸;再将1g磁性粉煤灰加入到溶胶中,搅拌直至磁性粉煤灰均匀地分散于湿溶胶中,然后将湿凝胶在65℃下干燥48h,得到了无定形的干凝胶粉体;然后在500℃下煅烧,煅烧时,升温速率为7℃/min,保温时间3h,即可得到磁性粉煤灰负载TiO2复合光催化剂;最后,制备分子印迹型磁性粉煤灰负载TiO2光催化剂:在70℃下将摩尔比为1:6的模板分子邻苯二酚和功能单体加入γ-巯丙基三甲氧基硅烷到50mL的无水乙醇内并搅拌直至溶解,然后加入磁性粉煤灰负载TiO2复合光催化剂并超声分散25min,然后再加入交联剂三羟甲基丙烷三甲丙烯酸酯和引发剂偶氮二异丁腈并在80W的功率下微波加热30min得产物B,再用无水乙醇和乙酸的混合溶液洗涤产物B直至滤液中未检测到模板分子,再用蒸馏水洗涤直至中性,最后用无水乙醇洗涤4次并在65℃的烘箱中干燥36h,其中,模板分子和磁性粉煤灰负载TiO2的质量比是1:15,交联剂体积和引发剂的质量比是1mL:10mg,即得到3号分子印迹型磁性粉煤灰负载TiO2光催化剂。
光催化反应的温度为30℃,在10mL 10mg/L的苯酚溶液中加入3号分子印迹型磁性粉煤灰负载TiO2光催化剂0.5g并将整个反应装置于50W的紫外灯下照射30min,然后用高效液相色谱检测光降解前后溶液中的浓度,并计算降解率。将光催化剂进行回收并用无水乙醇+乙酸进行洗脱,然后重复上述降解试验,如此循环6次并计算其降解率。结果发现循环6次后分子印迹型磁性粉煤灰负载TiO2光催化剂的降解率保持在93%。
Claims (9)
1.一种降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:该光催化剂由以下方法制得:
(1)选料:粉煤灰预处理并活化;
(2)制备磁性粉煤灰:取步骤1)中的0.5~1g活化粉煤灰于20~30min内超声分散在30~50mL蒸馏水中,接着加入3~6mmol含有Fe3+的铁盐并在常温下搅拌45~60min,然后在氮气保护下于60~80℃条件下加入1.5~4mmol的含有Fe2+的亚铁盐并搅拌反应60~90min,再加入氨水并搅拌1~3h使溶液的pH≥10,得到黑色沉淀产物A,最后用永磁体来收集该产物A并用去离子水洗涤至中性得磁性粉煤灰;
(3)磁性粉煤灰负载TiO2复合光催化剂:将体积比为1:2~5的钛醇盐和有机醇倒入三口烧瓶中并搅拌30~60min,然后取钛醇盐体积的1/10~4/5的酸慢慢滴加到三口烧瓶中继续搅拌,直至生成均匀透明的溶胶停止加酸;将步骤2)得到的磁性粉煤灰0.8~1.3g加入到溶胶中,搅拌直至磁性粉煤灰均匀地分散于湿溶胶中,然后将湿凝胶在50~80℃下干燥24~36h,得到了无定形的干凝胶粉体;然后在400~600℃下煅烧,即可得到磁性粉煤灰负载TiO2复合光催化剂;
(4)分子印迹型磁性粉煤灰负载TiO2光催化剂:在60~80℃下将摩尔比为1:4~8的模板分子和功能单体加入到30~60mL的无水乙醇内并搅拌直至溶解,然后加入步骤3)得到的磁性粉煤灰负载TiO2并超声分散15~30min,然后再加入交联剂和引发剂并微波加热得产物B,再用无水乙醇和乙酸的混合溶液洗涤产物B直至滤液中未检测到模板分子,再用蒸馏水洗涤直至滤液呈现中性,最后用无水乙醇洗涤3~5次并在50~80℃的烘箱中干燥24~48h。
2.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(1)中粉煤灰的预处理包括:先将取自电厂的粉煤灰过100~200目筛处理,再用去离子水淘洗3 ~ 4次,并去除上部浑浊的液体,然后干燥备用;将预处理过的粉煤灰浸入1~3mol/L的盐酸或5%~10%的硝酸溶液中于50~60℃下搅拌6~8h进行活化处理,活化处理以后过滤洗涤至中性,干燥备用。
3.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(2)中Fe2+的摩尔量与粉煤灰的质量之比为1mmol:(0.3~0.5)g。
4.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(3)中钛醇盐为四异丙醇钛酸酯或钛酸四丁酯,有机醇为甲醇、乙醇、正丙醇中的一种,酸为有机酸或无机酸。
5.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(3)中磁性粉煤灰干凝胶粉体煅烧时的升温速率为5~8℃/min,保温时间2~4h。
6.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(4)中的模板分子为苯酚、对硝基苯酚、邻苯二酚中的一种,功能单体为γ-巯丙基三甲氧基硅烷,交联剂为三羟甲基丙烷三甲丙烯酸酯,引发剂为偶氮二异丁腈。
7.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(4)中模板分子和磁性粉煤灰负载TiO2的质量比是1:10~20。
8.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(4)中交联剂体积和引发剂的质量比是1mL:(5~20)mg。
9.如权利要求1所述的降解含酚废水的磁性强化粉煤灰印迹光催化剂,其特征在于:所述步骤(4)中微波加热的功率是50~100W,微波加热的时间是10~60min。
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