Interfacial chemical bonds enhanced photocatalytic performance of kaolinite/NiFe layered double oxide heterostructure for photocatalytic activated peroxymonosulfate

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2024-08-08 DOI:10.1016/j.clay.2024.107520

Cheng Li , Huihua Jing , Bing Lv , Donghang Zhou , Shuguang Fu , Xiong Tang , Zhengpei Wang , Weiguang Wu , Denghui Jiang

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Abstract

Natural kaolinite is widely used in the field of photocatalysis as the support material of photocatalyst. However, its weak photochemical activity has severely limited its application as a photocatalyst in photocatalysis. Herein, kaolinite/NiFe layered double oxide (Kaol/NiFe-LDO) heterostructure photocatalyst was successfully constructed to activate peroxymonosulfate for degradation of organic pollutants. The chemical bonds formed at the interface of Kaol/NiFe-LDO heterostructures (HCs) greatly improve the photocatalytic ability of natural Kaol. Additionally, systematic characterization results validate that the Kaol/NiFe-LDO HCs possesses a direct Z-scheme band structure. By utilizing both interfacial chemical bonding and direct Z-type heterostructure effects, the optimized Kaol/NiFe-LDO HCs demonstrates a 2-fold increase in rhodamine B (RhB) degradation and a 6.5-fold increase in orange II (OII) degradation compared to natural Kaol in the presence of PMS as an oxidant. The Kaol/NiFe-LDO HCs photochemically activate the PMS to produce sulfate radicals through photo-generated hole oxidation, thus improving the photocatalytic performance of the system. The present study offers novel insights into the activation of PMS by natural clay minerals for environmental applications.

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高岭石/镍铁层状双氧化物异质结构的界面化学键增强了光催化活化过硫酸盐的光催化性能

天然高岭石作为光催化剂的支撑材料被广泛应用于光催化领域。然而，其微弱的光化学活性严重限制了其作为光催化剂在光催化领域的应用。本文成功构建了高岭石/镍铁层状双氧化物（Kaol/NiFe-LDO）异质结构光催化剂，用于活化过硫酸盐降解有机污染物。在 Kaol/NiFe-LDO 异质结构（HCs）界面上形成的化学键大大提高了天然 Kaol 的光催化能力。此外，系统表征结果还验证了 Kaol/NiFe-LDO HCs 具有直接谱带结构。通过利用界面化学键和直接 Z 型异质结构效应，优化后的 Kaol/NiFe-LDO HCs 与天然 Kaol 相比，在以 PMS 为氧化剂的条件下，罗丹明 B（RhB）的降解能力提高了 2 倍，橙 II（OII）的降解能力提高了 6.5 倍。Kaol/NiFe-LDO HCs 通过光生空穴氧化作用光化学激活 PMS 产生硫酸根自由基，从而提高了系统的光催化性能。本研究为天然粘土矿物活化 PMS 的环境应用提供了新的见解。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...