State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
Environ Geochem Health. 2024 Aug 24;46(10):396. doi: 10.1007/s10653-024-02186-x.
The reutilization of municipal wastes has always been one of the hottest subjects of sustainable development study. In this study, a novel biochar co-pyrolyzed from municipal sewage sludge and phosphorus tailings was produced to enhance the adsorption performance of the composite on Cu and Cd. The maximum Cu and Cd adsorption capacity of SSB-PT were 44.34 and 45.91 mg/g, respectively, which were much higher than that of sewage sludge biochar (5.21 and 4.58 mg/g). Chemisorption dominated the whole adsorption process while multilayer adsorption and indirect interaction were also involved. According to the result of X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectrum (XPS), the load of CO, Mg, and Ca on the surface of SSB-PT enhanced the precipitation and ion exchange effect. Posnjakite and CdCO were formed after the adsorption of Cu and Cd, respectively. Besides, complexation, and metal-π interaction were also involved during the adsorption process. Therefore, this study offered a promising method to reuse sewage sludge and phosphorus tailings as an effective adsorbent.
城市废物的再利用一直是可持续发展研究的热门课题之一。在本研究中，制备了一种由城市污水污泥和磷尾矿共热解得到的新型生物炭，以提高复合材料对 Cu 和 Cd 的吸附性能。SSB-PT 的最大 Cu 和 Cd 吸附容量分别为 44.34 和 45.91 mg/g，远高于污泥生物炭（5.21 和 4.58 mg/g）。化学吸附主导了整个吸附过程，同时也涉及多层吸附和间接相互作用。根据 X 射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱和 X 射线光电子能谱（XPS）的结果，SSB-PT 表面 CO、Mg 和 Ca 的负载增强了沉淀和离子交换作用。吸附 Cu 和 Cd 后分别形成了方镁石和 CdCO。此外，在吸附过程中还涉及配位和金属-π 相互作用。因此，本研究为利用污水污泥和磷尾矿作为有效吸附剂提供了一种有前景的方法。
