Free-standing and flexible 0D CeO2 nanodot/1D La(OH)3 nanofiber heterojunction net as a novel efficient and easily recyclable photocatalyst,Inorganic Chemistry Frontiers

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Free-standing and flexible 0D CeO2 nanodot/1D La(OH)3 nanofiber heterojunction net as a novel efficient and easily recyclable photocatalyst
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-10-30 , DOI: 10.1039/d0qi01074j
Kun Wang _{1,

2,

3,

4,

5} , Yujun Liang _{1,

2,

3,

4,

5} , Jian Yang _{1,

2,

3,

4,

5} , Gui Yang _{1,

2,

3,

4,

5} , Zikang Zeng _{1,

2,

3,

4,

5} , Rui Xu _{3,

4,

5,

6} , Xianjun Xie _{3,

4,

5,

6}

Affiliation

Compared to conventional semiconductor photocatalysts, 0D/1D heterojunction photocatalysts, emerging as an effective strategy to achieve charge mobility of photoinduced electron–hole pairs, have drawn considerable attention. Unfortunately, the nano-sized 0D/1D heterojunction normally suffers from poor recyclability and low photoactivity, which are not suitable for practical photocatalysis applications. Here, we report an unprecedented photocatalyst, denoted as a 0D CeO₂/1D La(OH)₃ heterojunction net, in which 0D CeO₂ nanodots are tightly anchored onto extra-long 1D La(OH)₃ nanofibers. The overwhelming photocatalytic capability of the as-prepared heterojunction was demonstrated by its decoloration of organic pollutants (Rhodamine B and methyl orange) and the reduction of hexavalent chromium under UV light irradiation. The boosted photocatalytic properties were ascribed to the enhanced optical absorption and fast charge transfer, as well as separation, which were induced by the synergistic effects of self-created in-built Ce⁴⁺/Ce³⁺ redox centers and the formation of heterojunctions between CeO₂ and La(OH)₃. More importantly, the unique net structure endows the 0D CeO₂/1D La(OH)₃ heterojunctions with excellent recyclability, which can address the challenges of a traditional nano-sized 0D/1D heterojunction. Our work paves a way toward constructing promising 0D/1D photocatalytic systems for the practical photocatalytic treatment of wastewater.

中文翻译：

独立且灵活的0D CeO2纳米点/ 1D La（OH）3纳米纤维异质结网，是一种新型高效且易于回收的光催化剂

与传统的半导体光催化剂相比，0D / 1D异质结光催化剂作为实现光致电子-空穴对电荷迁移率的一种有效策略而受到了广泛的关注。不幸的是，纳米级0D / 1D异质结通常具有较差的可回收性和较低的光活性，这不适用于实际的光催化应用。在这里，我们报告了一种前所未有的光催化剂，称为0D CeO ₂ / 1D La（OH）₃异质结网，其中0D CeO ₂纳米点紧密地锚固在超长的1D La（OH）_3上纳米纤维。所制备的异质结具有压倒性的光催化能力，这是通过其有机污染物（若丹明B和甲基橙）的脱色和在紫外线照射下六价铬的还原而证明的。增强的光催化性能归因于自建的内置Ce ⁴⁺ / Ce ³⁺氧化还原中心的协同作用以及在它们之间形成异质结所引起的增强的光吸收和快速的电荷转移以及分离CeO ₂和La（OH）₃。更重要的是，独特的网状结构赋予了0D CeO ₂ / 1D La（OH）₃具有出色可回收性的异质结，可以解决传统的纳米级0D / 1D异质结的挑战。我们的工作为构建有前途的0D / 1D光催化系统进行实际的光催化处理铺平了道路。

更新日期：2020-11-03

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