School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, China.
Jiangsu College of Nursing, Huai'an, China.
Int J Phytoremediation. 2024;26(4):448-458. doi: 10.1080/15226514.2023.2246591. Epub 2023 Aug 11.
Pyrite exhibits considerable potential as an adsorbent in wastewater treatment. However, few pyrite adsorbents are directly obtained from natural pyrite, as most are composite materials that require a complex preparation process. To develop a pyrite-based adsorbent with a simple preparation process, pyrite was processed by calcination at 400, 600, and 800 °C for 4 h and ball-milled into a fine powder. The adsorption properties of the pyrite powder were systematically explored. The calcined pyrite powder was characterized by SEM-EDS and XRD. The results revealed that the pyrite calcined at 600 °C exhibited excellent adsorption properties and was primarily composed of FeS. The optimum conditions for Cr(VI) removal were a temperature of 45 °C, an adsorbent dosage of 1 g, an equilibration time of 60 min, and an initial pH of 3. Moreover, the calcined pyrite powder exhibited excellent reusability, and the Cr(VI) removal rate exceeded 65% after three cycles. The Cr(VI) adsorption on pyrite can be well described by the Freundlich model and pseudo-second-order kinetic equation. The calcination temperature is the main factor affecting the adsorption performance of pyrite. Therefore, the calcined pyrite powder is expected to be an excellent adsorbent for Cr(VI) in the wastewater treatment industry.
黄铁矿作为一种吸附剂在废水处理中具有很大的潜力。然而，很少有直接从天然黄铁矿中获得的黄铁矿吸附剂，因为大多数都是需要复杂制备工艺的复合材料。为了开发一种具有简单制备工艺的基于黄铁矿的吸附剂，将黄铁矿在 400、600 和 800°C 下煅烧 4 小时，并球磨成细粉。系统地研究了黄铁矿粉末的吸附性能。用 SEM-EDS 和 XRD 对煅烧后的黄铁矿粉末进行了表征。结果表明，在 600°C 下煅烧的黄铁矿具有优异的吸附性能，主要由 FeS 组成。去除 Cr(VI)的最佳条件为温度 45°C、吸附剂用量 1g、平衡时间 60min 和初始 pH 值 3。此外，煅烧后的黄铁矿粉末具有良好的可重复使用性，经过三次循环后，Cr(VI)的去除率超过 65%。Cr(VI)在黄铁矿上的吸附可以很好地用 Freundlich 模型和拟二级动力学方程来描述。煅烧温度是影响黄铁矿吸附性能的主要因素。因此，煅烧后的黄铁矿粉末有望成为废水处理行业中 Cr(VI)的一种优良吸附剂。
