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以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能

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周奥, 曹新强, 顾彦, 焦磊, 黄应平, 方艳芬. 以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能[J]. 环境化学, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
引用本文: 周奥, 曹新强, 顾彦, 焦磊, 黄应平, 方艳芬. 以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能[J]. 环境化学, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
shu
ZHOU Ao, CAO Xinqiang, GU Yan, JIAO Lei, HUANG Yingping, FANG Yanfen. Preparation of BC@BiOBr catalyst with biochar as core and its visible light photocatalytic performance[J]. Environmental Chemistry, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
Citation: ZHOU Ao, CAO Xinqiang, GU Yan, JIAO Lei, HUANG Yingping, FANG Yanfen. Preparation of BC@BiOBr catalyst with biochar as core and its visible light photocatalytic performance[J]. Environmental Chemistry, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
shu

以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能

  • 1.

    三峡大学 生物与制药学院, 宜昌, 443002;

  • 2.

    三峡大学 水利与环境学院, 宜昌, 443002;

  • 3.

    三峡库区生态环境教育部工程研究中心(三峡大学), 宜昌, 443002

  • 基金项目:

    国家自然科学基金（21577078，21677086，21377067），科技惠民计划项目（S2013GMD100042），湖北省创新群体滚动项目（2015CFA021）和国家水专项（2012ZX07104-003-04）资助

Preparation of BC@BiOBr catalyst with biochar as core and its visible light photocatalytic performance

  • 1.

    China Three Gorges University, College of Biology and Pharmacy, Yichang, 443002, China;

  • 2.

    China Three Gorges University, College of Hydraulic and Environmental Engineering, Yichang, 443002, China;

  • 3.

    Engineering and Research of Ministry of Education of the Three Gorges Reservoir Area Center (China Three Gorges University), Yichang, 443002, China

  • Fund Project: Supported by National Natural Science Foundation of China(21577078, 21677086, 21377067), Science and Technology Huimin Project(S2013GMD100042), Hubei Innovation Group Scroll Project(2015CFA021) and National Water Special Project(2012ZX07104-003-04)

  • 摘要: 以热裂解处理香蒲的茎部获得比表面积为341.27 m2·g-1的生物炭作为载体，在水热条件下制备了生物炭负载的溴氧化铋（BC@BiOBr）光催化剂，并采用扫描电镜（SEM）、透射电镜（TEM）、X-射线衍射（XRD）、Zeta电位分析仪、紫外-可见漫反射（UV-Vis DRS）和荧光光谱（PL）等技术对该负载型催化剂的物理结构和性质进行了表征，结果发现BC@BiOBr和BiOBr两种催化剂表面均为BiOBr片，其中BC@BiOBr催化剂是由约1 μm片状 BiOBr组装而成，XRD测得上述两种催化剂均为BiOBr晶相，而对无定形的BC并未检测到.通过测定反应物前驱体和生物炭的表面电荷，推测带正电荷的氢氧化铋絮凝沉淀因静电引力BC@BiOBr簇状催化剂.通过紫外可见漫反射光谱、固体荧光光谱和循环伏安曲线等测试，发现构成的簇状结构既能提高BC@BiOBr对可见光的响应程度又能使其光生空穴和电子的复合几率变小.以罗丹明B（RhB）作为底物探针，测试催化剂在可见光照射90 min时的降解速率，发现与单纯BiOBr（71.4%）相比，BC@BiOBr具有更高的可见光催化活性（93.1%），通过对氧自由基等测定实验发现这可能与BC@BiOBr体系产生了更多的氧自由基有关.
    Abstract: Biochar with a specific surface area (SSA) 341.27 m2·g-1 was first prepared by pyrolysis of stems of Typha in a nitrogen atmosphere. Then BC@BiOBr photocatalyst was prepared under hydrothermal conditions using the prepared biochar. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction(XRD), Zeta potential sizer, UV-Vis DRS spectroscopy and Photoluminescence (PL) were employed to characterize the properties of the pre-catalysts. The results showed that both BC@BiOBr and BiOBr catalysts were BiOBr sheets, of which BC@BiOBr catalyst was assembled from about 1 μm BiOBr sheet. The two catalysts were BiOBr crystal phase, but the amorphous BC was not detectable. According to the measurement of the surface charge for the reactant precursor and biochar, it was speculated that in the preparation process the positively charged bismuth hydroxide sedimentation was highly dispersed on the negatively charged biochar due to electrostatic attraction, as reflected by SEM observation that the biochar was formed as the core wrapped by BiOBr tablets. Therefore, the BC@BiOBr has similar crystallinity, morphology and SSA to BiOBr. However, the visible light response of BC@BiOBr was effectively improved as compared with BiOBr, resulting from BC@BiOBr clusters structure on the biochar surface. This may be due to effective inhabitation of the recombination between photogenerated holes and electrons formed on BC@BiOBr clusters. Rhodamine B (RhB) was used as a substrate probe to test the degradation rate of the catalyst under visible light irradiation for 90 min. It was found that BC@BiOBr had higher visible light photocatalytic activity (93.1%) than BiOBr (71.4%). As a result, BC@BiOBr had higher visible light catalytic activity than BiOBr, probably attributed to the formation of more oxygen radical.
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  • 收稿日期:  2018-03-03
  • 刊出日期:  2019-02-15
周奥, 曹新强, 顾彦, 焦磊, 黄应平, 方艳芬. 以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能[J]. 环境化学, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
引用本文: 周奥, 曹新强, 顾彦, 焦磊, 黄应平, 方艳芬. 以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能[J]. 环境化学, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
shu
ZHOU Ao, CAO Xinqiang, GU Yan, JIAO Lei, HUANG Yingping, FANG Yanfen. Preparation of BC@BiOBr catalyst with biochar as core and its visible light photocatalytic performance[J]. Environmental Chemistry, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
Citation: ZHOU Ao, CAO Xinqiang, GU Yan, JIAO Lei, HUANG Yingping, FANG Yanfen. Preparation of BC@BiOBr catalyst with biochar as core and its visible light photocatalytic performance[J]. Environmental Chemistry, 2019, 38(2): 235-242. doi: 10.7524/j.issn.0254-6108.2018030303
shu

以生物炭为内核的BC@BiOBr催化剂的制备及可见光光催化性能

  • 1.  三峡大学 生物与制药学院, 宜昌, 443002;
  • 2.  三峡大学 水利与环境学院, 宜昌, 443002;
  • 3.  三峡库区生态环境教育部工程研究中心(三峡大学), 宜昌, 443002
  • 收稿日期:  2018-03-03
基金项目:

国家自然科学基金（21577078，21677086，21377067），科技惠民计划项目（S2013GMD100042），湖北省创新群体滚动项目（2015CFA021）和国家水专项（2012ZX07104-003-04）资助

摘要: 以热裂解处理香蒲的茎部获得比表面积为341.27 m2·g-1的生物炭作为载体，在水热条件下制备了生物炭负载的溴氧化铋（BC@BiOBr）光催化剂，并采用扫描电镜（SEM）、透射电镜（TEM）、X-射线衍射（XRD）、Zeta电位分析仪、紫外-可见漫反射（UV-Vis DRS）和荧光光谱（PL）等技术对该负载型催化剂的物理结构和性质进行了表征，结果发现BC@BiOBr和BiOBr两种催化剂表面均为BiOBr片，其中BC@BiOBr催化剂是由约1 μm片状 BiOBr组装而成，XRD测得上述两种催化剂均为BiOBr晶相，而对无定形的BC并未检测到.通过测定反应物前驱体和生物炭的表面电荷，推测带正电荷的氢氧化铋絮凝沉淀因静电引力BC@BiOBr簇状催化剂.通过紫外可见漫反射光谱、固体荧光光谱和循环伏安曲线等测试，发现构成的簇状结构既能提高BC@BiOBr对可见光的响应程度又能使其光生空穴和电子的复合几率变小.以罗丹明B（RhB）作为底物探针，测试催化剂在可见光照射90 min时的降解速率，发现与单纯BiOBr（71.4%）相比，BC@BiOBr具有更高的可见光催化活性（93.1%），通过对氧自由基等测定实验发现这可能与BC@BiOBr体系产生了更多的氧自由基有关.

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