Integration of Cu2O-NiTiO3 as an efficient p-n heterojunction visible light photocatalytic system for the simultaneous removal of Cr (VI) and Alizarine Cyanine Green dye

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research Bulletin Pub Date : 2024-11-17 DOI:10.1016/j.materresbull.2024.113213

Thirumalai Lakshmi , A. Mohammed Basheer Ali , Noor Danish Ahrar Mundari , T. Mishra , Noor Aman

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Abstract

Cu₂O loaded NiTiO₃ based p-n heterojunction photocatalysts of various proportions have been synthesized by liquid phase reduction process resulting in NiTiO₃ nanoparticles dispersed on the surface of Cu₂O. Formation of both oxide phases is confirmed from the XRD, HR-SEM and XPS analysis. Heterojunction formation is confirmed by the intimate contact between NiTiO₃ and Cu₂O as evidenced by HR-TEM. UV-Vis spectra exhibit a red shift indicating the extended visible light absorption. XPS shows the presence of oxidation states of Ni²⁺, Ti⁴⁺, Cu⁺, Cu²⁺ and O^2-. Heterojunction materials showed enhanced activity for the simultaneous photocatalytic reduction of Cr (VI) and degradation of Alizarine Cyanine Green dye under visible light irradiation. 1:2 ratio of Cu₂O and NiTiO₃ heterojunction (1C:2N) material exhibits 100% dye degradation in 90 minutes and Cr (VI) reduction in 180 minutes. Higher activity of Cu₂O-NiTiO₃ p-n heterojunction is ascribed to the effective charge separation and extended visible light absorption

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将 Cu2O-NiTiO3 整合为高效的 p-n 异质结可见光光催化系统，用于同时去除 Cr (VI) 和 Alizarine 青绿染料

通过液相还原工艺合成了不同比例的负载 Cu2O 的 NiTiO3 p-n 异质结光催化剂，从而使 NiTiO3 纳米颗粒分散在 Cu2O 表面。XRD、HR-SEM 和 XPS 分析证实了两种氧化物相的形成。HR-TEM 证明，NiTiO3 和 Cu2O 之间的亲密接触证实了异质结的形成。紫外-可见光谱显示出红移，表明对可见光的吸收延长。XPS 显示了 Ni2+、Ti4+、Cu+、Cu2+ 和 O2- 的氧化态。在可见光照射下，异质结材料在同时光催化还原六价铬和降解茜素蓝绿染料方面显示出更高的活性。1:2 比例的 Cu2O 和 NiTiO3 异质结（1C:2N）材料在 90 分钟内实现了 100% 的染料降解，在 180 分钟内实现了 Cr (VI) 的还原。Cu2O-NiTiO3 p-n 异质结的较高活性归因于有效的电荷分离和扩展的可见光吸收。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.