Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province, College of Environmental Engineering, Xuzhou University of Technology, Xuzhou 221018, China E-mail:
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
Water Sci Technol. 2021 Mar;83(6):1429-1445. doi: 10.2166/wst.2021.058.
Application of sewage sludge biochar as an adsorbent for pollutant removal has obtained special attention due to their low cost and surface functionality. In this research, sludge-tire composite biochar (STB) was successfully prepared through co-pyrolysis at 300, 500 and 700 °C, respectively. Cadmium (Cd) and tetracycline (TC) were selected as the target pollutant. The results indicated that STB has the highest surface area (49.71 m/g), more inorganic minerals (Kaolinite) as well as relatively stable physicochemical properties with 10% tire particles (TP) at 700 °C. The adsorption results indicated that the pseudo-second-order equation and Langmuir isotherm model could better describe the adsorption of Cd and TC by STB. The maximum adsorption capacity of Cd and TC was 50.25 mg/g and 90.09 mg/g, respectively. The main mechanism of the adsorption process of STB for Cd mainly involves anion binding adsorption and ion exchange. The main mechanism of the adsorption process of STB for TC mainly involves complexation and cation exchange. The present study could set a scientific foundation for further research on the recycle of sewage sludge and tires.
由于其低成本和表面功能，污水污泥生物炭作为一种吸附剂来去除污染物的应用引起了特别关注。本研究通过在 300、500 和 700°C 下分别进行共热解成功制备了污泥-轮胎复合生物炭（STB）。选择镉（Cd）和四环素（TC）作为目标污染物。结果表明，STB 具有最高的比表面积（49.71 m/g）、更多的无机矿物（高岭石）以及在 700°C 下添加 10%轮胎颗粒（TP）时相对稳定的物理化学性质。吸附结果表明，准二级方程和 Langmuir 等温线模型可以更好地描述 STB 对 Cd 和 TC 的吸附。Cd 和 TC 的最大吸附容量分别为 50.25 mg/g 和 90.09 mg/g。STB 对 Cd 的吸附过程的主要机制涉及阴离子结合吸附和离子交换。STB 对 TC 的吸附过程的主要机制涉及络合和阳离子交换。本研究为进一步研究污水污泥和轮胎的回收利用奠定了科学基础。
