CN109569672A - 一种BiOCl(100)/BiOCl(001)同相同质结及制备方法 - Google Patents
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Abstract
本发明涉及一种BiOCl(100)/BiOCl(001)同相同质结及制备方法。本发明制备方法步骤如下:先以Bi(NO3)3•5H2O和NaCl为主要原料,在水热条件下制备BiOCl(100)基体材料,将得到的BiOCl(100)基体材料与制备的氧化铋粉末混合,在盐酸作用下将氧化铋粉末在BiOCl(100)基体表面转换为BiOCl(001),形成BiOCl(100)/BiOCl(001)同相同质结。通过不同晶体学面择优暴露之间的BiOCl复合,提高BiOCl的光生载流子分离效率。本发明具有生产成本低,反应条件温和,易于规模化生产和易于操作等优点。
Description
技术领域
本发明属于功能材料领域,涉及一种BiOCl(100)/BiOCl(001)同相同质结及制备方法。
背景技术
酸雨、雾霾、光化学烟雾等环境问题主要与石油、天然气、煤等化石燃料的大量消耗有关。而光催化技术可以直接利用太阳能,产生电能、化学能等,对解决能源问题、处理空气和水体污染等将起到关键作用。作为核心关键材料,光催化剂利用光照产生的光生电子空穴对氧化降解有机污染物,反应效率高,稳定性强。氯氧化铋是近年来发展起来的一种新型光催化剂,价格低廉、易于获取,但其本身光催化活性较弱,需要进一步的改性被提高其光催化性能。例如,在专利201410247057.1中,公开了一种氯氧化铋/石墨烯复合可见光催化剂的制备方法,当将氯氧化铋和石墨烯复合成一种异质结时,就可以利用石墨烯来有效传输光生电子,进一步提高光生电子与空穴的分离效率。Sun等以Bi(NO3)3•5H2O、KI为主要原料,通过低温水浴法制备了BiOI,然后采用水热法以Bi(NO3)3•5H2O、KCl为主要原料,在160 °C下水热24 h后得到了BiOCl,将BiOI和BiOCl粉末分散均匀后在250 °C下热处理3 h得到用BiOI/BiOCl材料(ACS Catal., 2015, 5: 3540−3551)。现有技术在提高氯氧化铋的光催化性能方面,主要都是通过引入第二相或掺杂等手段,制备工艺复杂性,导致生产成本过高,难以实现大规模生产。迄今为止,通过BiOCl不同颗粒结晶面之间的复合形成单组分BiOCl(100)/BiOCl(001)同相同质结的相关工作尚未见报道,通过不同晶体学面择优暴露之间的BiOCl复合,提高BiOCl的光生载流子分离效率,为新型光催化剂设计提供新设计思路。
发明内容
本发明的目的在于提供一种BiOCl(100)/BiOCl(001)同相同质结高效光催化剂的制备方法,具有光催化性能高,生产成本低廉,生产周期短,易于大规模生产等优点。
本发明采用如下技术方案:
步骤1,将一定量的Bi(NO3)3•5H2O溶解在硝酸溶液中,加入NaCl溶液,其中Bi(NO3)3•5H2O与NaCl摩尔之比为1:1,然后用NaOH溶液调节pH值,直到混合溶液的pH=5.5~6.0;
步骤2,将所述步骤1获得的溶液投入反应釜中,在140~180ºC下水热反应12~18小时,将沉淀过滤、清洗后获得(100)面暴露的BiOCl粉体;
步骤3,称取一定量的五水硝酸铋溶解在硝酸与柠檬酸的混合溶液中,然后用NaOH溶液调节pH值到溶液的pH为6~7,使五水硝酸铋的浓度为0.35~0.75mol/L;
步骤4,将所述的步骤3中获得的溶液干燥后得到溶胶,将其干燥,研磨,过筛,在380~470℃下煅烧3~5h,得到氧化铋粉末;
步骤5,将氧化铋粉末与步骤2中得到的BiOCl粉体混合,加入去离子水后超声分散,然后将盐酸溶液加入到上述体系中,其中BiOCl粉体与氧化铋粉末摩尔比为1:(0~0.5),氧化铋与盐酸摩尔比为1:(7~18),将沉淀使用乙醇和去离子水反复洗涤3次,干燥后得到BiOCl(100)/BiOCl(001)同相同质结。
所述的BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于,所述BiOCl(100)/BiOCl(001)同相同质结中BiOCl(100)和BiOCl(001) 的结构为四方相,所述的BiOCl(100)/BiOCl(001)同相同质结在光催化方面的应用。与现有技术相比,本发明具有以下有益效果:
(1)本发明采用水热法与软化学法相结合制备了BiOCl(100)/BiOCl(001)同相同质结复合光催化剂,本发明在不改变体系成分前提下调控BiOCl的光催化性能,具有设计新颖,生产成本低,制备周期短等优点。
(2) 本发明制备的BiOCl(100)/BiOCl(001)同相同质结复合光催化剂在模拟太阳光照330 min后脱色率可达93%,BiOCl(100)在可见光照330min后的脱色率为39%,BiOCl(001)在可见光照射330min后脱色率为41%,BiOCl(100)/BiOCl(001)的脱色率较BiOCl(100)和BiOCl(001)有很大的提高。
附图说明
图1是本发明实施例1中制备的BiOCl(100)/BiOCl(001)同相同质结的XRD衍射图谱。
图2是本发明实施例1中制备的BiOCl(100)/BiOCl(001)同相同质结的TEM图。
图3是本发明实施例1、实施例2和实施例3制备的BiOCl(100)/BiOCl(001)同相同质结、BiOCl(001)和BiOCl(100)的光催化脱色率曲线。
图4是本发明实施例1、实施例2和实施例3制备的BiOCl(100)/BiOCl(001)同相同质结、BiOCl(001)和BiOCl(100)的荧光光谱曲线。
具体实施方式
下面结合附图和本发明优选的具体实施例对本发明做进一步描述,原料均为分析纯。
实施例1:
步骤1,将一定量的Bi(NO3)3•5H2O溶解在硝酸溶液中,加入NaCl溶液,其中Bi(NO3)3•5H2O与NaCl摩尔之比为1:1,Bi(NO3)3•5H2O的浓度为0.3mol/L,NaCl溶液的浓度为0.3mol/L,然后用NaOH溶液调节pH值,直到混合溶液的pH=6.0;
步骤2,将所述步骤1获得的溶液投入反应釜中,在160ºC下水热反应12小时,将沉淀过滤、清洗后获得(100)面暴露的BiOCl粉体;
步骤3,称取一定量的五水硝酸铋溶解在硝酸与柠檬酸的混合溶液中,然后用NaOH溶液调节pH值到溶液的pH为6,使五水硝酸铋的浓度为0.65mol/L;
步骤4,将所述的步骤3中获得的溶液干燥后得到溶胶,将其干燥,研磨,过筛,在400℃下煅烧4h,得到氧化铋粉末;
步骤5,将氧化铋粉末与步骤2中得到的BiOCl粉体混合,加入去离子水后超声分散,然后将盐酸溶液加入到上述体系中,其中BiOCl粉体与氧化铋粉末摩尔比为1:0.2,添加的氧化铋与盐酸摩尔比为1:14,将沉淀使用乙醇和去离子水反复洗涤3次,干燥后得到BiOCl(100)/BiOCl(001)同相同质结。
实施例2:
步骤1,将一定量的Bi(NO3)3•5H2O溶解在硝酸溶液中,加入NaCl溶液,其中Bi(NO3)3•5H2O与NaCl摩尔之比为1:1,Bi(NO3)3•5H2O的浓度为0.3mol/L,NaCl溶液的浓度为0.3mol/L,然后用NaOH溶液调节pH值,直到混合溶液的pH=6.0;
步骤2,将所述步骤1获得的溶液投入反应釜中,在160ºC下水热反应12小时,将沉淀过滤、清洗后获得(100)面暴露的BiOCl粉体。
实施例3:
步骤1,称取一定量的五水硝酸铋溶解在硝酸与柠檬酸的混合溶液中,然后用NaOH溶液调节pH值到溶液的pH为6,使五水硝酸铋的浓度为0.65mol/L;
步骤2,将所述的步骤2中获得的溶液干燥后得到溶胶,将其干燥,研磨,过筛,在400℃下煅烧4h,得到氧化铋粉末;
步骤3,将一定量的氧化铋粉体分散在100mL去离子水中,逐滴加入HCl酸溶液,其中氧化铋与HCl酸的摩尔比为1:(7~18),HCl酸滴加完后继续搅拌3~5小时,将沉淀过滤、用去离子水反复洗涤、干燥后得到(001)面暴露的BiOCl粉体。
应用例:
对实施例1、实施例2和实施例3所制得的BiOCl(100)/BiOCl(001)同相同质结、BiOCl(100)和BiOCl(001)进行光催化活性评价,具体操作步骤为:
称量实施例1、实施例2和实施例3所制得的BiOCl(100)/BiOCl(001)同相同质结、BiOCl(100)和BiOCl(001)光催化剂各100 mg,将其分别加入到百里香芬蓝染料溶液中(100mL,15mg·L-1),避光搅拌1h,待脱吸附达到平衡后打开500W氙灯光源,每隔30min检测一次染料的浓度,在给定时间内表征出所制备材料对百里香芬蓝的催化脱色情况。
以上所述内容仅为本发明构思下的基本说明,通过阅读本发明说明书而对本发明技术方案采取的任何等效的变换,只要不脱离本发明技术方案的精神和范围,均应属本发明的保护范围。
Claims (7)
1.一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于BiOCl(100)和BiOCl(001)均为四方相结构,BiOCl(001)组分为(001)面择优暴露,BiOCl(100)组分为(100)面择优暴露,具体包括以下制备步骤:
步骤1,将一定量的Bi(NO3)3•5H2O溶解在硝酸溶液中,加入NaCl溶液,其中Bi(NO3)3•5H2O与NaCl摩尔之比为1:1,然后用NaOH溶液调节pH值,直到混合溶液的pH=5.5~6.0;
步骤2,将所述步骤1获得的溶液投入反应釜中,在140~180ºC下水热反应12~18小时,将沉淀过滤、清洗后获得(100)面暴露的BiOCl粉体;
步骤3,称取一定量的五水硝酸铋溶解在硝酸与柠檬酸的混合溶液中,然后用NaOH溶液调节pH值到溶液的pH为6~7,使五水硝酸铋的浓度为0.35~0.75mol/L;
步骤4,将所述的步骤3中获得的溶液干燥后得到溶胶,将其干燥,研磨,过筛,在380~470℃下煅烧3~5h,得到氧化铋粉末;
步骤5,将氧化铋粉末与步骤2中得到的BiOCl粉体混合,加入去离子水后超声分散,然后将盐酸溶液加入到上述体系中,其中BiOCl粉体与氧化铋粉末摩尔比为1:(0~0.5),氧化铋与盐酸摩尔比为1:(7~18),将沉淀使用乙醇和去离子水反复洗涤3次,干燥后得到BiOCl(100)/BiOCl(001)同相同质结。
2.根据权利要求1所述的一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于:所述步骤1中Bi(NO3)3•5H2O的浓度为0.2~0.5mol/L,NaCl溶液的浓度为0.2~0.5mol/L。
3.根据权利要求1所述的一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于:所述步骤2中水热温度为140~180ºC,水热时间为12~18小时。
4.根据权利要求1所述的一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于:所述步骤3中溶液的pH为6~7,五水硝酸铋的浓度为0.35~0.75mol/L。
5.根据权利要求1所述的一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于:所述步骤4中煅烧温度为380~470℃,煅烧时间为3~5h。
6.根据权利要求1所述的一种BiOCl(100)/BiOCl(001)同相同质结及制备方法,其特征在于:所述步骤5中BiOCl与氧化铋摩尔比为1:(0~0.5),盐酸溶液浓度为0.05~0.1 mol/L,氧化铋与盐酸摩尔比为1:(7~18)。
7.所述BiOCl(100)/BiOCl(001)同相同质结在光催化方面的应用。
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