School of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan 056038, China.
Int J Environ Res Public Health. 2022 Jul 4;19(13):8169. doi: 10.3390/ijerph19138169.
Nitrophenols are toxic substances that present humans and animals with the risk of deformities, mutations, or cancer when ingested or inhaled. Traditional water treatment technologies have high costs and low p-nitrophenol (PNP) removal efficiency. Therefore, an ultraviolet (UV)-activated granular activated carbon supported nano-zero-valent-iron-cobalt (Co-nZVI/GAC) activated persulfate (PS) system was constructed to efficiently degrade PNP with Co-nZVI/GAC dosage, PS concentration, UV power, and pH as dependent variables and PNP removal rate as response values. A mathematical model between the factors and response values was developed using a central composite design (CCD) model. The model-fitting results showed that the PNP degradation rate was 96.7%, close to the predicted value of 98.05 when validation tests were performed under Co-nZVI/GAC injection conditions of 0.827 g/L, PS concentration of 3.811 mmol/L, UV power of 39.496 W, and pH of 2.838. This study demonstrates the feasibility of the response surface methodology for optimizing the UV-activated Co-nZVI/GAC-activated PS degradation of PNP.
硝酚类物质是有毒物质，摄入或吸入会对人类和动物造成畸形、突变或癌症的风险。传统的水处理技术成本高，对 p-硝酚（PNP）的去除效率低。因此，构建了一种紫外（UV）激活的颗粒活性炭负载纳米零价铁-钴（Co-nZVI/GAC）激活过硫酸盐（PS）系统，以 Co-nZVI/GAC 用量、PS 浓度、UV 功率和 pH 为自变量，PNP 去除率为响应值，高效降解 PNP。采用中心复合设计（CCD）模型建立了因素与响应值之间的数学模型。模型拟合结果表明，在 Co-nZVI/GAC 投加量为 0.827g/L、PS 浓度为 3.811mmol/L、UV 功率为 39.496W、pH 值为 2.838 的条件下进行验证试验时，PNP 的降解率达到 96.7%，接近 98.05%的预测值。本研究证明了响应面法优化 UV 激活 Co-nZVI/GAC 激活 PS 降解 PNP 的可行性。
