CN112517040A - 一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法及应用 - Google Patents
一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法及应用 Download PDFInfo
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Abstract
本发明涉及污水处理技术领域,且公开了一种海胆状Bi2S3负载蜂窝状Fe掺杂g‑C3N4,蜂窝状的Fe掺杂g‑C3N4含有丰富的结构结构,比表面积巨大,有利于提高对光能的接触面积和利用率,海胆状纳米Bi2S3均匀生长在蜂窝状Fe掺杂g‑C3N4的表面和孔隙结构中,两者形成异质结结构,拓宽了g‑C3N4的可见光吸收范围,有利于电子跃迁,生成更多的光生电子和空穴,异质结结构促进了Fe掺杂g‑C3N4导带上的电子向Bi2S3导带上迁移,抑制了光生电子和空穴的重组和复合,加速了光生电子‑空穴对的分离,进一步产生更多的超氧负离子和氢氧自由基,与亚甲基蓝、罗丹明B等有机染料发生氧化还原反应,降解为无毒的小分子。
Description
技术领域
本发明涉及污水处理技术领域,具体为一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法及应用。
背景技术
有机染料废水具有污染中、毒性大、成分复杂、难降解等特点,是一种常见的染料废水,主要有亚甲基蓝、孔雀石绿、罗丹明B、甲基橙等,目前对于有机染料废水的处理方法主要为氧化还原法、物理吸附法、沉淀法等,其中光催化降解是一种高效的有机染料降解方法,通过光辐射在光催化基上,产生光生电子-空穴对,进一步与氧气和水反应,生成超氧负离子和氢氧自由基,与有机染料发生氧化还原反应,降解为无污染小分子。
目前的光催化剂主要有二氧化钛、过渡金属氧化物、过渡金属硫化物、铋基化合物等,其中石墨相氮化碳g-C3N4具有良好的可见光响应性和较高的光催化活性,并且原料来源丰富、制备方法简单、无毒无污染,是一种广泛研究的光催化材料,但是g-C3N4的带隙较宽、可见光利用率较低、光生电子和空穴复合率高,容易重组,严重影响了g-C3N4的光催化活性,铋基化合物如Bi2S3、Bi2O3、BiVO4等的禁带宽度较窄,光吸收能力强,光化学活性高,并且Bi2S3的能带与g-C3N4相匹配,可以形成异质结复合光催化剂,有效改善光生电子和空穴复合,提高光催化性能。
(一)解决的技术问题
针对现有技术的不足,本发明提供了一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法及应用,解决了g-C3N4光催化剂的可见光利用率不高、光生电子和空穴容易发生重组和复合的问题。
(二)技术方案
为实现上述目的,本发明提供如下技术方案:一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,所述Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法如下:
(1)向反应瓶中加入蒸馏水溶剂和纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至60-80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉进行煅烧,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于氢氟酸溶液中,匀速搅拌进行刻蚀,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,应用于光催化降解材料和污水处理领域。
优选的,所述步骤(1)中的纳米SiO2、三聚氰胺和硝酸铁的质量比为50-70:100:1-4。
优选的,所述步骤(1)中的电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接。
优选的,所述步骤(1)中的煅烧过程升温速率为5-10℃/min,升温至540-560℃,保温煅烧3-5h。
优选的,所述步骤(2)中的氢氟酸溶液浓度为5-10%,刻蚀时间为3-6h。
优选的,所述步骤(3)中的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4的质量比为30-40:55-75:100。
附图说明
图1是煅烧炉结构示意图;
图2是煅烧室调节示意图;
图3是移动齿轮杆放大示意图。
1-煅烧炉;2-煅烧室;3-煅烧坩埚;4-移动齿轮杆;5-旋转齿轮。
(三)有益的技术效果
与现有技术相比,本发明具备以下有益的技术效果:
该一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,以纳米SiO2作为模板,硝酸铁作为铁源,在煅烧热聚合过程中,得到Fe掺杂g-C3N4包覆纳米SiO2,进一步提高氢氟酸刻蚀除去纳米SiO2模板,得到蜂窝状的Fe掺杂g-C3N4,含有丰富的结构结构,比表面积巨大,有利于提高对光能的接触面积和利用率,同时Fe掺杂引入g-C3N4的晶格,使g-C3N4在热聚合结晶过程形成缩聚,延缓了g-C3N4的晶相转变,使晶体粒径变小,从而进一步提高比表面积。
该一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,在水热体系中,生成的海胆状纳米Bi2S3均匀生长在蜂窝状Fe掺杂g-C3N4的表面和孔隙结构中,Bi2S3与Fe掺杂g-C3N4的能带相匹配,两者形成异质结结构,拓宽了g-C3N4的可见光吸收范围,有利于电子跃迁,生成更多的光生电子和空穴,同时异质结结构促进了Fe掺杂g-C3N4导带上的电子向Bi2S3导带上迁移,抑制了异质结结构的光生电子和空穴的重组和复合,加速了光生电子-空穴对的分离,进一步产生更多的超氧负离子和氢氧自由基,而活性极强的超氧负离子、氢氧自由基和空穴作为活性物质,与亚甲基蓝、罗丹明B等有机染料发生氧化还原反应,降解为无毒的小分子,实现高效的光催化降解和污水处理。
具体实施方式
为实现上述目的,本发明提供如下具体实施方式和实施例:一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,制备方法如下:
(1)向反应瓶中加入蒸馏水溶剂和质量比为50-70:100:1-4的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至60-80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为5-10℃/min,升温至540-560℃,保温煅烧3-5h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为5-10%的氢氟酸溶液中,匀速搅拌进行刻蚀3-6h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为30-40:55-75:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,应用于光催化降解材料和污水处理领域。
实施例1
(1)向反应瓶中加入蒸馏水溶剂和质量比为50:100:1的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至60℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为5℃/min,升温至540℃,保温煅烧3h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为5%的氢氟酸溶液中,匀速搅拌进行刻蚀3h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为30:55:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4。
实施例2
(1)向反应瓶中加入蒸馏水溶剂和质量比为60:100:2.5的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为8℃/min,升温至540℃,保温煅烧4h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为8%的氢氟酸溶液中,匀速搅拌进行刻蚀4h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为35:63:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4。
实施例3
(1)向反应瓶中加入蒸馏水溶剂和质量比为70:100:4的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为10℃/min,升温至560℃,保温煅烧5h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为10%的氢氟酸溶液中,匀速搅拌进行刻蚀6h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为40:75:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4。
对比例1
(1)向反应瓶中加入蒸馏水溶剂和质量比为40:100:0.5的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为10℃/min,升温至540℃,保温煅烧4h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为10%的氢氟酸溶液中,匀速搅拌进行刻蚀3h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为25:45:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4。
对比例2
(1)向反应瓶中加入蒸馏水溶剂和质量比为80:100:5的纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至80℃,匀速搅拌直至溶剂蒸发,将混合产物置于电阻炉中电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接,升温速率为8℃/min,升温至550℃,保温煅烧4h,得到Fe掺杂g-C3N4包覆纳米SiO2。
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于浓度为10%的氢氟酸溶液中,匀速搅拌进行刻蚀5h,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4。
(3)向反应瓶中加入蒸馏水溶剂、质量比为45:85:100的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,匀速搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,反应结束后离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4。
向蒸馏水中加入亚甲基蓝和复合光催化剂海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,浓度分别为0.5%和3%,以300W氙灯作为光源,光照下匀速搅拌6h,使用UV-9000双光束紫外-可见分光光度计检测亚甲基蓝的吸光度和浓度,并计算降解率,检测标准为GB/T23762-2020。
向蒸馏水中加入罗丹明B和复合光催化剂海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,浓度分别为0.5%和3%,以300W氙灯作为光源,光照下匀速搅拌6h,使用UV-9000双光束紫外-可见分光光度计检测罗丹明B的吸光度和浓度,并计算降解率,检测标准为GB/T 23762-2020。
Claims (6)
1.一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4的制备方法如下:
(1)向反应瓶中加入蒸馏水溶剂和纳米SiO2、三聚氰胺和硝酸铁,超声分散至均匀后,加热至60-80℃,搅拌直至溶剂蒸发,将混合产物置于电阻炉进行煅烧,得到Fe掺杂g-C3N4包覆纳米SiO2;
(2)将Fe掺杂g-C3N4包覆纳米SiO2置于氢氟酸溶液中,搅拌进行刻蚀,除去纳米SiO2,蒸馏水洗涤固体产物至中性,得到将Fe掺杂蜂窝状g-C3N4;
(3)向反应瓶中加入蒸馏水溶剂、硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4,搅拌均匀后,将溶液倒入水热反应釜中,进行水热反应,离心除去溶剂,蒸馏水和乙醇洗涤,得到海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,应用于光催化降解材料和污水处理领域。
2.根据权利要求1所述的一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述步骤(1)中的纳米SiO2、三聚氰胺和硝酸铁的质量比为50-70:100:1-4。
3.根据权利要求1所述的一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述步骤(1)中的电阻炉包括煅烧炉,煅烧炉内部设置有煅烧室,煅烧室内部设置有煅烧坩埚,煅烧室底部固定连接有移动齿轮杆,移动齿轮杆与旋转齿轮活动连接。
4.根据权利要求1所述的一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述步骤(1)中的煅烧过程升温速率为5-10℃/min,升温至540-560℃,保温煅烧3-5h。
5.根据权利要求1所述的一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述步骤(2)中的氢氟酸溶液浓度为5-10%,刻蚀时间为3-6h。
6.根据权利要求1所述的一种海胆状Bi2S3负载蜂窝状Fe掺杂g-C3N4,其特征在于:所述步骤(3)中的硫脲、硝酸铋和Fe掺杂蜂窝状g-C3N4的质量比为30-40:55-75:100。
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