Irradiation Time Optimization on Photocatalytic Activity of Nanoparticles MgO from Dolomite Bangkalan

Trends in Sciences Pub Date : 2024-02-25 DOI:10.48048/tis.2024.7442

Lydia Rohmawati, Silviana Nurul Fathoni, W. Setyarsih, Nugrahani Primary Putri, D. Darminto

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Abstract

Dolomite is a type of sedimentary rock material that is often found in the Bangkalan Madura area. This dolomite has a higher MgO compound content than in the other areas, namely 40 %, but its utilization has only been as fertilizer and building materials. For this reason, this research aims to determine the characteristics of MgO nanoparticles and their application in photocatalytic with visible light irradiation. The synthesis of MgO nanoparticles used the hydrochloric acid leaching method, and the results were characterized by X-ray diffraction, Fourier transform infrared, Scanning electron microscopy, Transmission electron microscopy, Raman spectroscopy, Photoluminescence, and Ultraviolet-visible spectroscopy. The results showed that the synthesized MgO nanoparticles had a periclase phase and were shaped like a spherical cube with an average nanoparticle size of 27 nm and an energy gap of 3.9 eV. The optical properties of the MgO nanoparticles showed quite strong luminescence at a Raman shift of 1,087.36 cm−1, which was associated with the type of vibrational waves in the atomic lattice, and there were surface defects on the surface of the MgO nanoparticles, namely in the emission spectra of 720.06 and 740.39 nm originating from oxygen vacancies (F-center) and Mg vacancies (V-center). The photocatalytic activity of MgO nanoparticles in visible light showed the optimum time to degrade 30 ppm methylene blue dye in 360 min and yielded a degradation percentage of 99 %. Therefore, MgO nanoparticles could be used for processing industrial dye waste using visible light. HIGHLIGHTS The synthesis of MgO Nanoparticles from Bangkalan dolomite used the hydrochloric acid leaching method The presence of nanocrystallite size, crystal defects, and oxygen vacancies in MgO nanoparticles can increase photocatalytic activity MgO nanoparticles can degrade methylene blue dye with an optimum time of 360 minutes under visible light irradiation GRAPHICAL ABSTRACT

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辐照时间优化对白云石邦卡兰纳米氧化镁光催化活性的影响

白云岩是一种沉积岩材料，经常在邦卡兰马杜拉地区发现。这种白云岩的氧化镁化合物含量高于其他地区，达到 40%，但其用途仅限于肥料和建筑材料。因此，本研究旨在确定氧化镁纳米粒子的特性及其在可见光照射下的光催化应用。采用盐酸浸出法合成了纳米氧化镁，并通过 X 射线衍射、傅立叶变换红外光谱、扫描电子显微镜、透射电子显微镜、拉曼光谱、光致发光和紫外可见光谱对合成结果进行了表征。结果表明，合成的氧化镁纳米粒子具有包晶相，形状为球形立方体，纳米粒子平均尺寸为 27 nm，能隙为 3.9 eV。氧化镁纳米粒子的光学性质显示出相当强的发光强度，拉曼位移为 1,087.36 cm-1，这与原子晶格中的振动波类型有关，而且氧化镁纳米粒子表面存在表面缺陷，即在 720.06 和 740.39 nm 的发射光谱中存在氧空位（F 中心）和镁空位（V 中心）。氧化镁纳米粒子在可见光下的光催化活性表明，降解 30 ppm 亚甲基蓝染料的最佳时间为 360 分钟，降解率达 99%。纳米氧化镁颗粒中存在的纳米晶粒大小、晶体缺陷和氧空位可提高光催化活性纳米氧化镁颗粒在可见光照射下可在 360 分钟内降解亚甲基蓝染料。

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来源期刊

Trends in Sciences

CiteScore

1.20

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0.00%

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