BaTiO3 Nanoparticles for highly efficient piezocatalytic reduction of toxic hexavalent chromium: Synthesis, optimization, and kinetic study

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL

Journal of hazardous materials advances Pub Date : 2024-09-11 DOI:10.1016/j.hazadv.2024.100468

Peshawa H. Mahmood , Omid Amiri , S. Mohammad Sajadi

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Abstract

Drinking water contamination with heavy metals from industrial activities is an important issue. In particular, the hexavalent chromium ions Cr (VI) which are classified as group (A) carcinogens. Our research reports an effective removal of hexavalent chromium from water through the use of BaTiO₃ (BTO) as a piezocatalyst. We meticulously prepared pure tetragonal BTO by optimizing the synthesis parameters. The optimized BTO catalyst was utilized for the removal of Cr(VI) under applied mechanical force and removed up to 96 % of Cr(VI) from the solution. Our kinetic study revealed that the reaction follows a pseudo-first order. Thermodynamic studies indicated that the reaction is most spontaneous at temperatures of 20 °C and concentrations of 20 ppm. Our proposed mechanism for removing Cr(VI) by BTO piezocatalysts suggests that only 15 % of chromium was removed by adsorption, while the rest was removed by reduction through the piezocatalytic process.

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用于高效压电催化还原有毒六价铬的 BaTiO3 纳米粒子：合成、优化和动力学研究

工业活动造成的饮用水重金属污染是一个重要问题。特别是被列为 (A) 类致癌物的六价铬离子 Cr (VI)。我们的研究报告称，通过使用 BaTiO3 (BTO) 作为压电催化剂，可有效去除水中的六价铬。我们通过优化合成参数，精心制备了纯净的四方 BTO。在施加机械力的条件下，利用优化的 BTO 催化剂去除溶液中的六价铬，去除率高达 96%。我们的动力学研究表明，反应遵循伪一阶。热力学研究表明，在温度为 20 °C 和浓度为 20 ppm 时，反应最为自发。我们提出的 BTO 压电催化剂去除六价铬的机理表明，只有 15% 的铬是通过吸附去除的，其余的是通过压电催化还原去除的。

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