BiPO4@glucose-based C core–shell nanorod heterojunction photocatalyst with enhanced photocatalytic activity
BiPO4@glucose-based C core–shell nanorod heterojunction photocatalyst with enhanced photocatalytic activity
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BiPO4@葡萄糖基C核壳纳米棒异质结光催化剂具有增强的光催化活性
DOI：
10.1016/j.jallcom.2015.12.012
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发表时间：
2016-03
影响因子：
6.2
通讯作者：
Ao Xia
中科院分区：
文献类型：
--
作者：
Huijun Ren;Chi Xu;Chengcheng Zhao;Ao Xia
采用微波水热法成功制备了BiPO4@葡萄糖基C（BiPO4@C）核壳纳米棒异质结光催化剂。[BiPO 4（六方相）]H+可以被带负电荷的葡萄糖分子吸收，取代葡萄糖分子的羟基。在微波水热处理过程中，葡萄糖在BiPO 4纳米棒周围发生碳化，发生分子间交联和脱水反应，形成BiPO4@C。空间位阻效应抑制了BiPO 4晶体的生长。在紫外光照射下，BiPO4@C核壳纳米棒异质结光催化剂对罗丹明B（RhB）的光催化降解表现出较强的光催化活性。光催化活性的增强程度强烈依赖于碳在BiPO 4表面的覆盖度。BiPO4@21C的碳壳厚度约为10 nm，具有最高的光催化活性。在紫外光照射下，RhB的光降解率在10 min内达到94%以上，其降解率是商业TiO 2（P25）的4.1倍，是纯BiPO 4的2.3倍。这是由于碳层与BiPO 4之间紧密的界面接触产生了协同效应，可以延长光生电子-空穴对的寿命。BiPO4@21C光催化反应20 min后，TOC去除率可达60%，是BiPO 4的2.3倍。由于煅烧后BiPO4@C核壳结构的破坏和BPO 4晶格中体缺陷的增加，BiPO 4/21 C的光催化活性很低。
BiPO4@glucose-based C (BiPO4@C) core–shell nanorod heterojunction photocatalyst was successfully prepared by the facile microwave hydrothermal method. [BiPO4(hexagonal phase)]H+could be absorbed by the negatively charged glucose molecule to replace the hydroxyl of the glucose molecule. BiPO4@C was formed by the carbonization of glucose around the BiPO4nanorods involving the intermolecular cross-linking and dehydration of the glucose molecules during the microwave hydrothermal treatment. The steric hindrance effect inhibited the crystal growth of BiPO4. BiPO4@C core–shell nanorod heterojunction photocatalyst showed an enhanced photocatalytic activity for the degradation of Rhodamine B (RhB) under UV light irradiation. The degree of photocatalytic activity enhancement strongly depended on the coverage of carbon on the surface of BiPO4. A carbon shell of about 10 nm thickness for BiPO4@21C exhibited the highest photocatalytic activity. Greater than 94% photodegradation of RhB under the exposure of UV light was achieved within 10 min, and its degradation rate was 4.1 times higher than that of commercial TiO2(P25) and 2.3 times higher than that of pure BiPO4. This was attributed to the synergistic effect based on the intimate interfacial contacts between the carbon layers and BiPO4, which could prolong the lifetime of photogenerated electron–hole pairs. Moreover, the TOC removal efficiency could reach 60% for BiPO4@21C after 20 min of UV photocatalytic reaction, which exceeded that of BiPO4by 2.3 times. BiPO4/21C displayed very low photocatalytic activity because of the destruction of BiPO4@C core–shell structure and the increase of bulk defects in the BPO4lattice after calcination.
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