Department of Chemistry, Shahreza Branch, Islamic Azad University, P. O. Box 311-86145, Shahreza, Isfahan, Islamic Republic of Iran.
Environ Sci Pollut Res Int. 2022 Jun;29(30):45276-45291. doi: 10.1007/s11356-022-19040-1. Epub 2022 Feb 10.
Nowadays, critical environmental pollution needs some novel, simple, effective, and cost-effective catalysts with high efficiency in the visible region of the light. Thus, the AgI/BiOI coupled nanocatalyst sample (CS) was prepared and briefly characterized. The pH values of 6.2, 5.4, and 4.5 were estimated for AgI, BiOI, and AgI/BiOI samples. Based on the PXRD results, average crystallite sizes of 35.2, 34.7, and 34.1 nm were obtained for AgI, BiOI, and AgI/BiOI samples from the Scherrer formula and 38.3, 25.6, and 25.6 nm by the Williamson-Hall formula. SEM image confirmed a sheet-like BiOI morphology covered by AgI nanoparticles. The simultaneous interactions of the influencing variables on the boosted photocatalytic activity of CS sample towards Eriochrome Black T (EBT) were evaluated by response surface methodology (RSM) (under 100-W tungsten lamp irradiation with 230 mW/m.nm irradiance). The goodness of the model was confirmed by the significance of the model (F value of 65.68 > F = 2.55) and a non-significant LOF (F value of 0.97 < F = 8.79) at a 95% confidence interval obtained in ANOVA analysis of the results. The center point runs have the following conditions: catalyst dose: 0.68 g/L; pH: 7.5; C: 7.25 mg/L; and irradiation time: 53.5 min, while the optimal run included the following conditions: catalyst dose: 1.0 g/L; pH: 4; C: 10 mg/L; and irradiation time: 80 min. About 95% of EBT molecules were degraded in the optimal conditions.
如今，严重的环境污染需要一些新型、简单、高效、具有成本效益且在可见光区高效的催化剂。因此，制备并简要表征了 AgI/BiOI 耦合纳米催化剂样品（CS）。AgI、BiOI 和 AgI/BiOI 样品的 pH 值分别估计为 6.2、5.4 和 4.5。根据 PXRD 结果，用谢乐公式得到 AgI、BiOI 和 AgI/BiOI 样品的平均晶粒尺寸分别为 35.2、34.7 和 34.1nm，用威廉姆森-霍尔公式得到 38.3、25.6 和 25.6nm。SEM 图像证实了 AgI 纳米颗粒覆盖的片状 BiOI 形态。通过响应面法（RSM）评估了各影响变量对 CS 样品增强的 Eriochrome Black T（EBT）光催化活性的协同作用（在 100W 钨灯下辐照，辐照度为 230mW/m.nm）。通过方差分析（ANOVA）对结果进行分析，模型的显著性（F 值为 65.68> F=2.55）和非显著失拟（F 值为 0.97< F=8.79）证实了模型的良好性。中心点运行的条件为：催化剂剂量为 0.68g/L；pH 值为 7.5；C 为 7.25mg/L；照射时间为 53.5min，而最佳运行条件包括以下条件：催化剂剂量为 1.0g/L；pH 值为 4；C 为 10mg/L；和照射时间为 80min。在最佳条件下，约 95%的 EBT 分子被降解。
