CN106076363A - 一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法 - Google Patents
一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法 Download PDFInfo
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Abstract
本发明提供了一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法,所述方法包括如下步骤:S1.将银盐加入到乙二醇溶液中,然后加入含钛化合物,搅拌得混合液,加热反应,将所得产物得到过滤、洗涤、干燥,即得Ag/TiO2同轴异质纳米线;S2.将钴盐加入到乙醇溶液中,然后加入步骤S1所得Ag/TiO2同轴异质纳米线,加热反应,过滤、洗涤、干燥后即得所述光催化剂;本发明采用两步水热法制备出氧化钴修饰的Ag/TiO2同轴异质纳米线,避免了高温处理对TiO2产物的形貌和稳定性影响,并且避免了单质银被氧化,同时减少了能耗;且能够高效实现全水解。所述方法制备工艺简单,重复性好,具有较大的推广应用价值。
Description
技术领域
本发明涉及无机材料制备技术领域,具体涉及制备一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法。
背景技术
能源危机和环境恶化是当前人类社会所面临的两个重大问题,随着经济的发展,人们对于生态环境和能源问题的关注日益增长,解决能源危机和环境污染的问题是提高我国人民生活质量、实现国家可持续发展的迫切需要。据环保部2014年报告,我国因经济发展而引发环境污染持续增长,人们生存环境持续恶化,仅此一年损失超过3.82万亿元。因此,开发清洁、有效的环境治理和能源技术已迫在眉睫。TiO2作为一种传统光催化材料因具有无毒、稳定性好、耐酸碱、光催化活性高等优点,不仅可直接利用降解工业废水和废气中的有机物和有毒物质,广泛应用于环境污染治理;而且还在太阳能电池、光解水制氢等新兴能源领域广泛使用。因此,TiO2基光催化材料的制备、光电性能及应用一直是国内外研究热点。
TiO2由于TiO2的能带隙为3.2 eV,能在波长低于380 nm以下的紫外光发生响应,而太阳光谱中紫外光不足5%,而波长为400~750 nm的可见光占到45%左右,这从根本上制约了TiO2光催化剂应用。由于贵金属表面等离子共振效应(Surface Plasmons Resonance,SPR)及与TiO2费米能级交错而形成的界面电荷分离,复合贵金属后,金属/TiO2复合光催化材料可实现对可见光响应,而且促进光生电荷有效分离,提高材料光电性能。Tada等人发现Au粒子的存在可以促进TiO2的表面电荷运输,而且Au粒子的SPR效应产生的“热电子”多少与其颗粒大小直接相关。Kamat等人设计的Ag/TiO2核壳结构,在紫外光激发下光生电子会从TiO2壳层转移到Ag核层存储起来,并通过还原C60等反应研究Ag核内电子的转移现象,这为新型金属/TiO2结构的设计及电荷分离和转移机理研究提供了参考模式。Xia等人发现Ag立方盒随颗粒的变小而吸收光谱发生红移,这为金属/TiO2复合光催化材料对可见光利用的选择性可调提供了新思路。助催化剂可以有效提高量子效率。据报道,使用适当的助催化剂将氧化活性中心和还原活性中心分开,量子效率可达100%。以贵金属作为助催化剂,不仅有利于半导体光激发电子快速转移,促进光生电荷分离,而且有利于H2的产生,从分子水平上探讨光催化过程中H2产生的机理。这些合理的设计理念为理性设计合成高效光催化剂提供了策略。
采用氧化钴修饰的Ag/TiO2同轴异质纳米线的方法促进其光催化全解水鲜有报道。因此,仍需研究一种制备氧化钴修饰Ag/TiO2同轴异质纳米线等离子体共振效应全解水光催化剂的制备方法。
发明内容
本发明的目的在于克服现有技术的不足,提供一种氧化钴修饰的Ag/TiO2同轴异质纳米线的制备方法,本发明提供的氧化钴修饰的Ag/TiO2同轴异质纳米线具有尺寸可控、大小均匀、量子效率高等优点。
本发明的另一目的在于提供上述制备方法制备得到的氧化钴修饰Ag/TiO2同轴异质纳米线。
本发明的另一目的在于提供上述氧化钴修饰的Ag/TiO2同轴异质纳米线在光催化全解水制备氢气和氧气、降解有机污染物等方面的应用。
本发明上述目的通过以下技术方案实现:
本发明提供了一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法,所述方法包括如下步骤:
S1.将银盐加入到乙二醇溶液中,然后加入含钛化合物,搅拌得混合液,加热反应,将所得产物得到过滤、洗涤、干燥,即得Ag/TiO2同轴异质纳米线;
S2.将钴盐加入到乙醇溶液中,然后加入步骤S1所得Ag/TiO2同轴异质纳米线,加热反应,过滤、洗涤、干燥后即得所述光催化剂;
所述银盐为醋酸银或硝酸银中的一种或两种;含钛化合物为钛酸丁酯或钛酸异丙酯中的一种或两种。
优选地,所述银盐与含钛化合物的反应摩尔比为1:(1~5)。
更优选地,所述银盐与含钛化合物的反应摩尔比为1:(1~3)。
优选地,所述S1中加热反应温度为180~220℃,反应时间为20~28h;所述S2中加热反应温度为100~140℃,反应时间为10~15h。
更优选地,所述S1中加热反应温度为200℃,反应时间为24h;所述S2中加热反应温度为120℃,反应时间为12h。
优选地,所述S1中银盐的加入量为满足其浓度在(0.02~0.05)mol/L;所述S2中氯化钴的加入量为满足其浓度在(0.01~0.04)mol/L。
优选地,所述S2中钴盐与Ag/TiO2同轴异质纳米线的反应质量比为1:(2~5)。
优选地,所述银盐为硝酸银,含钛化合物为钛酸丁酯。
优选地,所述S1和S2中加热反应为在水热反应釜中进行。
本发明提供的方法制备得到的氧化钴修饰Ag/TiO2同轴异质纳米线的尺寸可控、大小均匀,具有优异的可见光催化活性,在光催化全解水、降解有机污染物等领域具有广泛的应用前景。
本发明选用银盐作为原料,以在乙二醇中溶解性好的含钛化合物为钛源,采用乙二醇为溶剂,在溶剂热环境中发生反应,一步即可制备得到Ag/TiO2同轴异质纳米线;本发明采用溶剂法一步直接制备出晶化程度良好的Ag/TiO2同轴异质纳米线。所得产物无需高温处理,避免了高温处理对TiO2产物的形貌和稳定性的影响,同时也避免了单质Ag被氧化。本发明制备得到的Ag/TiO2同轴异质纳米线尺寸可控、大小均匀;Ag/TiO2同轴异质纳米线直径约为5nm以下,分布均匀,修饰量大小可控,而且制备得到的Ag/TiO2同轴异质纳米线具有优异的可见光催化活性,在光催化全解水、降解有机污染物等领域具有广泛的应用前景。
本发明提供的溶剂热法与其他溶剂热法存在明显区别,本发明选用乙二醇作为反应溶剂,乙二醇的沸点较高,为197℃,其可加热到200℃以上,在本发明提供的方法的反应过程中,乙二醇既作为溶剂又作为还原剂,其能够将Ag+还原成单质Ag,而无需添加任何还原剂。当选用乙醇或丙三醇等醇类作为反应溶剂,无法制备得到本发明相似效果的Ag/TiO2同轴异质纳米线;现有技术中在制备Ag/TiO2纳米线的过程中通常需要加入适量的还原剂,例如硼氢化钠,但是添加此类还原剂给产物的纯化带来了困难。本发明选用乙二醇作为反应溶剂,无需添加其它还原剂,还原得到的Ag纳米线直径约为50 nm以下,尺寸可控、大小均匀,修饰量大小可调,并且所得Ag/TiO2同轴异质纳米线的纯度高。
与现有技术相比,本发明具有以下有益效果:
(1)本发明采用两步法制备出氧化钴修饰Ag/TiO2同轴异质纳米线,所得产物无需高温处理,避免了高温处理对TiO2产物的形貌和稳定性影响,并且避免了单质银被氧化,同时减少了能耗;(2)高效利用太阳光。在太阳光(紫外-可见光)作用下,TiO2的价电子吸收紫外光激发到导带,并快速转移到外层贵金属纳米粒子上,形成负电活性中心,光催化过程中发生还原反应;产生的空穴转移到Co氧化物上,形成正电活性中心,光催化过程中发生氧化反应。而可见光甚至近红外光穿透TiO2层(20nm以下),激发Ag纳米线发生等离子体共振产生热电子,透过TiO2层转移到贵金属纳米粒子上,而产生的空穴转移到Co氧化物上。实现光催化过程中的氧化与还原反应分区域进行,从而降低了光生电子与空穴复合的概率,高效实现全水解(图1)。(3)助催化剂Co氧化物可以捕获空穴和降低氧过电位,改变水分子的吸附、解离、O-O双键生成、O2脱附等反应历程,快速有效分离光生电子-空穴对,促进光催化活性。(4)金属的形貌和粒径大小对等离子体共振效应产生很大的影响,对于较大纵横比的Ag纳米线而言,入射光在金属Ag被多次散射,增大光路长度和光吸收,提高太阳光的利用率。本发明提供的方法制备工艺简单,重复性好,具有较大的推广应用价值。
附图说明
图1为氧化钴修饰Ag/TiO2同轴异质结构(A)及其在太阳光作用下(B)电荷分离与分区域光催化氧化与还原反应示意图;
图2 为本发明制得的Ag/TiO2同轴异质纳米线扫描电子显微镜(SEM)和透射电镜(TEM)图:(a)Ag/TiO2纳米线SEM图;(b)Ag/TiO2纳米线TEM图;(c)Ag/TiO2纳米线HRTEM图;(d)钛元素映射图像(Elemental Mapping Images);(e)银元素映射图像;(f)氧元素映射图像;
图3 为本发明制得的Ag/TiO2纳米线光电子能谱(XPS)图谱:(a)全谱图;(b)Ag;(c)Ti;(d) O。
图4 为本发明实施例1制得的氧化钴修饰Ag/TiO2纳米线与对比例1制备的Ag/TiO2纳米颗粒在太阳光作用下光催化全解水效果图:(a)和(b)分别为实施例1中Ag/TiO2同轴异质纳米线产氢和产氧曲线、(c)和(d)分别为对比例1中Ag/TiO2纳米颗粒产氢和产氧曲线。
图5 为本发明实施例1制得的氧化钴修饰Ag/TiO2纳米线与对比例1制备的Ag/TiO2纳米颗粒在太阳光作用下光催化降解甲基橙效果图:(a)实施例1中氧化钴修饰Ag/TiO2纳米线催化效果图;(b) 对比例1制备的Ag/TiO2纳米颗粒催化效果图。
具体实施方式
下面结合说明书附图和具体实施例进一步说明本发明。下述实施例中所使用的实验方法如无特殊说明,均为常规方法:所使用原料、助剂等,如无特殊说明,均为可从常规市场购买等商业途径得到的原料和助剂。
实施例1 :光催化剂1的制备
在100 ml的烧杯中,将加入170 mg硝酸银(AgNO3)到盛有25 ml乙二醇(HO-CH2-CH2-OH,纯度≥99.5%)溶液中,充分搅拌后,缓慢滴入1 mmol ml钛酸丁酯(Ti(C4H9O)4,纯度≥99.0%)溶液,强烈搅拌30min,然后转移到50ml内衬四聚氟乙烯反应釜中200 ℃恒温保持24h,自然冷却到室温,所得产物经过滤,用蒸馏水、无水乙醇洗涤沉淀各三次,然后在60℃下,真空干燥24 h,制得Ag/TiO2同轴异质纳米线。
在含100mg氯化钴的乙醇溶液30ml,加入制备好的Ag/TiO2纳米线0.3 g,充分搅拌后,将其置于在50mL特氟隆密封高压釜,并保持在120℃反应12h。收集沉淀物,并用蒸馏水洗涤和无水乙醇三次,分别与烘箱干燥,在60℃真空干燥24h。制得氧化钴修饰的Ag/TiO2同轴异质纳米线。
采用此步骤制备Ag纳米线的长度约为50 nm,包裹TiO2层的厚度约为10nm,表面可明显看到存在氧化钴纳米颗粒。
实施例2 光催化剂2的制备
在100 ml的烧杯中,将加入340 mg硝酸银(AgNO3)到盛有25 ml乙二醇(HO-CH2-CH2-OH,纯度≥99.5%)溶液中,充分搅拌后,缓慢滴入1 mmol ml钛酸丁酯(Ti(C4H9O)4,纯度≥99.0%)溶液,强烈搅拌30min,然后转移到50ml内衬四聚氟乙烯反应釜中200 ℃恒温保持24h,自然冷却到室温,所得产物经过滤,用蒸馏水、无水乙醇洗涤沉淀各三次,然后在60℃下,真空干燥24 h,制得Ag/TiO2同轴异质纳米线。
在含100mg氯化钴的乙醇溶液30ml,加入制备好的Ag/TiO2纳米线0.3 g,充分搅拌后,将其置于在50mL特氟隆密封高压釜,并保持在120℃反应12h。收集沉淀物,并用蒸馏水洗涤和无水乙醇三次,分别与烘箱干燥,在60℃真空干燥24h。制得氧化钴修饰的Ag/TiO2同轴异质纳米线。
采用此步骤制备Ag纳米线的长度约为80 nm,包裹TiO2层的厚度约为10nm,表面可明显看到存在氧化钴纳米颗粒。
实施例3 光催化剂3的制备
在100 ml的烧杯中,将加入510 mg硝酸银(AgNO3)到盛有25 ml乙二醇(HO-CH2-CH2-OH,纯度≥99.5%)溶液中,充分搅拌后,缓慢滴入1 mmol ml钛酸丁酯(Ti(C4H9O)4,纯度≥99.0%)溶液,强烈搅拌30min,然后转移到50ml内衬四聚氟乙烯反应釜中200 ℃恒温保持24h,自然冷却到室温,所得产物经过滤,用蒸馏水、无水乙醇洗涤沉淀各三次,然后在60℃下,真空干燥24 h,制得Ag/TiO2同轴异质纳米线。
在含100mg氯化钴的乙醇溶液30ml,加入制备好的Ag/TiO2纳米线0.3 g,充分搅拌后,将其置于在50mL特氟隆密封高压釜,并保持在120℃反应12h。收集沉淀物,并用蒸馏水洗涤和无水乙醇三次,分别与烘箱干燥,在60℃真空干燥24h。制得氧化钴修饰的Ag/TiO2同轴异质纳米线。
采用此步骤制备Ag纳米线的长度约为50 nm,包裹TiO2层的厚度约为10nm,表面可明显看到存在氧化钴纳米颗粒。
对采用本发明方法制得的Ag/TiO2纳米线采用采用LEO1530VP型场发射扫描电子显微镜(SEM)(如说明书附图2)和日本电子公司JEOL-2010型透射电子显微镜进行形貌和结构分析(如说明书附图2)。结果表明:所得样品存在Cu、Ti、O等元素,Ag/TiO2呈线状结构,长度为1~2μm,直径约为50nm。
采用英国 VG ESM-LAB的光电能谱对制得的材料进行了XPS分析(如图3),结果表明产物中存在Ag、 Ti和O三种元素,其中Ag2p能级电子结合能为368.5 eV和374.5 eV,说明存在单质银。
对比例1 水热法制备Ag/TiO2纳米粉末光催化剂
将硝酸银(0.4g)完全溶解在75ml蒸馏水,然后逐滴加入4.5ml的钛酸丁酯,不断搅拌。然后将混合物在室温下搅拌2h,转移到一个100ml的聚四氟乙烯内衬不锈钢高压釜,在恒温干燥箱里到160 ℃恒温保持24h。自然冷却到室温,所得产物经过滤,用蒸馏水、无水乙醇洗涤沉淀各三次,然后在60℃下,真空干燥24 h。
实施例4:光催化活性评价
光催化全解水试验:光催化活性评价反应使用容积为100 ml石英玻璃反应器,在LABSOLAR-H2 (III)型反应装置上进行的(北京畅拓仪器设备有限公司)。使用300 W氙灯做为紫外-可见光光源。在一个典型的光解水实验中,将100 mg所得催化剂加入到80 ml 纯水中,先在暗室中超声分散20 min以得到较好的分散状态,为了达到脱附-吸附平衡,在开灯前,吹氮气通过反应器40分钟彻底去除溶解氧,确保反应器是在厌氧条件下。一个0.4毫升的气体是通过间歇采样间隔,采用气相色谱分析(GC-14C,岛津,日本,TCD)所得产物中的氢气和氧气。
光催化降解甲基橙试验:催化活性评价反应采用容积为200 ml玻璃反应器,在XPS-II型反应装置上进行的(南京胥江机电厂生产)。使用1000 W氙灯做为紫外-可见光光源,并使用自制滤液吸收紫外光源从而得到可见光光源,滤液采用NaNO3(2 M)来吸收波长低于400 nm以下的光。这一溶液层位于灯管与循环冷却水之间的夹层,这样经过水层进一步吸收紫外光后,使得紫外光吸收率达98%以上。将20 mg所得催化剂加入到200 ml 甲基橙(MO)溶液 (20 mg/l)中,先在暗室中超声分散15 min以得到较好的分散状态,为了达到脱附-吸附平衡,在开灯前,在通入200 ml/min 空气的情况下磁力搅拌吸附1 h,然后在室温下进行光催化反应。反应过程中,每隔一定时间取8 ml样一次,取得的悬浮液在高速离心机中离心 10 min以去除溶液中悬浮着的催化剂,取上层清液在日立 UV-3010分光光度计测试其浓度。甲基橙的脱色效率可以通过C = (A0-A)/A0×100%计算得到,其中A0是20 mg/lMO在465 nm处的吸光度,A是不同时间取出样品MO的吸光度。
对本发明实施例1的方法制得的氧化钴修饰Ag/TiO2同轴异质纳米线、和对照例1制备得到的Ag/TiO2纳米颗粒进行了光催化全解水的效果比较,具体可参看附图4,其中(a)和(b)分别为实施例1制备得到的Ag/TiO2同轴异质纳米线产氢和产氧曲线、(c)和(d)分别为对比例1制备得到的Ag/TiO2纳米颗粒产氢和产氧曲线。如图4对比可知,本发明制备得到的氧化钴修饰Ag/TiO2同轴异质纳米线,产氢产氧效率分别为234和117 mmol∙h-1, 对照例1制备的Ag/TiO2纳米颗粒,产氢产氧效率分别为138和69 mmol∙h-1。
另外,太阳光作用下光催化降解甲基橙效果比较如图5所示,实施例1中氧化钴修饰Ag/TiO2同轴异质纳米线褪色率为96.8%,对比例1制备的Ag/TiO2纳米颗粒在同等条件下的褪色率仅为57%。由此可知,本发明制备得到的氧化钴修饰Ag/TiO2同轴异质纳米线具有更好的光催化活性。
Claims (10)
1.一种氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂的制备方法,其特征在于,所述方法包括如下步骤:
S1.将银盐加入到乙二醇溶液中,然后加入含钛化合物,搅拌得混合液,加热反应,将所得产物得到过滤、洗涤、干燥,即得Ag/TiO2同轴异质纳米线;
S2.将钴盐加入到乙醇溶液中,然后加入步骤S1所得Ag/TiO2同轴异质纳米线,加热反应,过滤、洗涤、干燥后即得所述光催化剂;
所述银盐为醋酸银或硝酸银中的一种或两种;含钛化合物为钛酸丁酯或钛酸异丙酯中的一种或两种。
2.根据权利要求1所述的制备方法,其特征在于,所述银盐与含钛化合物的反应摩尔比为1:(1~5)。
3.根据权利要求2所述的制备方法,其特征在于,所述银盐与含钛化合物的反应摩尔比为1:(1~3)。
4.根据权利要求1所述的制备方法,其特征在于,所述S1中加热反应温度为180~220℃,反应时间为20~28h;所述S2中加热反应温度为100~140℃,反应时间为10~15h。
5.根据权利要求1所述的制备方法,其特征在于,所述S1中加热反应温度为200℃,反应时间为24h;所述S2中加热反应温度为120℃,反应时间为12h。
6.根据权利要求1所述的制备方法,其特征在于,所述S1中银盐的加入量为满足其浓度在(0.02~0.05)mol/L;所述S2中氯化钴的加入量为满足其浓度在(0.01~0.04)mol/L。
7.根据权利要求1所述的制备方法,其特征在于,所述S2中钴盐与Ag/TiO2同轴异质纳米线的反应质量比为1:(2~5)。
8.根据权利要求1所述的制备方法,其特征在于,所述银盐为硝酸银,含钛化合物为钛酸丁酯。
9.根据权利要求1所述的制备方法,其特征在于,所述S1和S2中加热反应为在水热反应釜中进行。
10.一种权利要求1至9任一所述的制备方法制备得到的氧化钴修饰的Ag/TiO2同轴异质纳米线光催化剂。
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