Student Research Committee, Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Department of Environmental Health Engineering, Abadan Faculty of Medical Sciences, Abadan, Iran.
Water Sci Technol. 2021 Feb;83(3):567-579. doi: 10.2166/wst.2020.592.
In this study, hematite nanoparticles (HNPs) were used as the persulfate (PS) activator for the sonocatalytic degradation of bisphenol A (BPA). The physicochemical properties of the synthesized HNPs were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The effect of different operational parameters (pH, nanoparticle dosage, persulfate concentration, and ultrasonic power) on catalytic activity were evaluated. The BPA degradation rate was improved when ultrasonic (US) irradiation was used simultaneously with HNPs for activating PS. According to the results, 98.94% of BPA (10 mg/L) was degraded within 15 min of reaction time at 4 mM persulfate and 0.01 g/L HNPs under ultrasonic irradiation of 250 W. The degree of mineralization of BPA was measured using chemical oxygen demand (COD), and 36.98% was achieved under optimum conditions. Quenching tests were done using different scavenger compounds; these showed that both hydroxyl and sulfate radicals were reactive species in BPA degradation. According to the results of reusability tests, the degradation efficiency decreased to 86.34%, indicating that HNPs can be recycled several times. All of the anions tested, but mainly hydrogen phosphate, had an inhibitory effect on BPA degradation. The results showed that the US/HNPs/PS process is effective for the degradation of the organic pollutants.
在这项研究中，赤铁矿纳米粒子（HNPs）被用作过硫酸盐（PS）的活化剂，用于超声催化降解双酚 A（BPA）。使用 X 射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、傅里叶变换红外光谱（FTIR）和透射电子显微镜（TEM）研究了合成的 HNPs 的物理化学性质。考察了不同操作参数（pH、纳米粒子用量、过硫酸盐浓度和超声功率）对催化活性的影响。当超声（US）辐射与 HNPs 同时用于激活 PS 时，BPA 的降解率得到提高。结果表明，在 4 mM 过硫酸盐和 0.01 g/L HNPs 下，在 250 W 的超声辐射下，反应 15 分钟内，BPA（10 mg/L）的降解率达到 98.94%。采用化学需氧量（COD）测量 BPA 的矿化程度，在最佳条件下达到 36.98%。通过使用不同的猝灭剂化合物进行猝灭试验，表明羟基自由基和硫酸根自由基都是 BPA 降解的反应性物质。根据重复使用试验的结果，降解效率下降到 86.34%，表明 HNPs 可以多次回收。所有测试的阴离子，主要是磷酸氢盐，对 BPA 的降解都有抑制作用。结果表明，US/HNPs/PS 工艺可有效降解有机污染物。
