La-supported SnO2–CaO composite catalysts for efficient malachite green degradation under UV–vis light

IF 4.3 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Nastaran Parsafard, Ghazaleh Aghajari
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引用次数: 0

Abstract

This study presents the development and optimization of La@SnO2–CaO composite catalysts for efficient photocatalytic degradation of malachite green dye in aqueous solutions under UV–vis light irradiation. The catalysts were prepared via conventional incipient-wetness impregnation and thoroughly characterized using advanced analytical techniques, including X-ray diffraction, Fourier transform infrared spectroscopy, UV–vis diffuse reflectance spectroscopy, N2 adsorption–desorption analysis, and scanning electron microscopy. To optimize photodegradation efficiency, the effects of three independent factors were systematically investigated using response surface methodology: Temperature, pH, and Sn/Ca molar ratio. Our results reveal optimal conditions for maximum dye degradation: pH 7, Sn/Ca molar ratio of 0.33, and a process time of 35 min, resulting in a maximum photodegradation efficiency of 98.80% for malachite green dye. Notably, visible light exhibited a more pronounced effect on dye degradation compared to UV light over time, with visible light achieving 25% greater dye removal after 60 min of illumination. Furthermore, the catalyst showed excellent recyclability, retaining 85% of its initial activity after five consecutive cycles. These findings contribute significantly to the development of sustainable methods for dye removal from wastewater and highlight the potential of La@SnO2–CaO composite catalysts in environmental remediation processes, particularly in treating textile industry effluents.

紫外可见光下用于高效降解孔雀石绿的 La-supported SnO2-CaO 复合催化剂
本研究开发并优化了 La@SnO2-CaO 复合催化剂,用于在紫外-可见光照射下高效光催化降解水溶液中的孔雀石绿染料。催化剂的制备采用了传统的浸渍法,并利用先进的分析技术,包括 X 射线衍射、傅立叶变换红外光谱、紫外-可见光漫反射光谱、N2 吸附-解吸分析和扫描电子显微镜,对催化剂进行了全面表征。为了优化光降解效率,采用响应面方法系统地研究了三个独立因素的影响:温度、pH 值和 Sn/Ca 摩尔比。我们的研究结果表明了实现最大染料降解的最佳条件:pH 值为 7,锡/钙摩尔比为 0.33,处理时间为 35 分钟,从而使孔雀石绿染料的最大光降解效率达到 98.80%。值得注意的是,随着时间的推移,可见光对染料降解的影响比紫外线更明显,可见光照射 60 分钟后,染料去除率提高了 25%。此外,该催化剂还表现出极佳的可回收性,在连续使用五个周期后,其初始活性仍能保持 85%。这些发现极大地促进了可持续废水染料去除方法的开发,并凸显了 La@SnO2-CaO 复合催化剂在环境修复过程中的潜力,尤其是在处理纺织工业废水方面。
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来源期刊
BMC Chemistry
BMC Chemistry Chemistry-General Chemistry
CiteScore
5.30
自引率
2.20%
发文量
92
审稿时长
27 weeks
期刊介绍: BMC Chemistry, formerly known as Chemistry Central Journal, is now part of the BMC series journals family. Chemistry Central Journal has served the chemistry community as a trusted open access resource for more than 10 years – and we are delighted to announce the next step on its journey. In January 2019 the journal has been renamed BMC Chemistry and now strengthens the BMC series footprint in the physical sciences by publishing quality articles and by pushing the boundaries of open chemistry.
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