School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China.
School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China.
J Environ Sci (China). 2019 Mar;77:383-391. doi: 10.1016/j.jes.2018.09.017. Epub 2018 Sep 26.
Pathogenic viruses in drinking water are great threats to public health. Visible-light-driven photocatalysis is a promising technology for virus inactivation. However, the existing photocatalytic antiviral research studies have mostly been carried out in single-component systems, neglecting the effect of natural organic matter, which exists widely in actual water bodies. In this paper, electrospun Cu-TiO nanofibers were prepared as photocatalysts, and their photocatalytic antiviral performance in the presence of humic acid (HA) was comprehensively studied for the first time. The properties of the reaction mixture were measured during the reaction. In addition, the safety, reliability and stability of photocatalytic disinfection in the mixed system were evaluated. The results showed that the virus removal efficiency decreased with the increase of the HA concentration. The type of reaction solution, such as PBS buffer solution or water, did not affect the removal efficiency noticeably. Under acidic conditions, the electrostatic forces between photocatalysts and viruses were strengthened, leading to higher virus removal efficiency. As the reaction time went on, the pH value in the solution increased first and then tended to be stable, the conductivity remained stable, and the dissolved oxygen increased first and then decreased. The safety test showed that the concentration of Cu ions released into the solution was lower than specified by the international standards. No photoreactivation was observed, and the addition of HA significantly reduced the reutilization efficiency of the photocatalysts.
饮用水中的致病病毒对公众健康构成了巨大威胁。可见光驱动的光催化是一种很有前途的病毒灭活技术。然而，现有的光催化抗病毒研究大多在单一组分体系中进行，忽略了广泛存在于实际水体中的天然有机物的影响。本文首次制备了电纺 Cu-TiO 纳米纤维作为光催化剂，并综合研究了其在腐殖酸 (HA) 存在下的光催化抗病毒性能。在反应过程中测量了反应混合物的性质。此外，还评估了混合体系中光催化消毒的安全性、可靠性和稳定性。结果表明，随着 HA 浓度的增加，病毒去除效率降低。反应溶液的类型，如 PBS 缓冲溶液或水，对去除效率的影响不明显。在酸性条件下，光催化剂和病毒之间的静电力增强，导致更高的病毒去除效率。随着反应时间的延长，溶液的 pH 值先升高后趋于稳定，电导率保持稳定，溶解氧先升高后降低。安全性测试表明，溶液中释放的 Cu 离子浓度低于国际标准规定的浓度。没有观察到光复活现象，HA 的添加显著降低了光催化剂的再利用效率。
