Li Qi, Lv Liang, Zhao Xudong, Wang Yong, Wang Yongzhen
College of Materials Science and Engineering, Taiyuan University of Technology, No. 79, Yingzexi Street, Wanbailin District, Taiyuan, 030024, China.
Aluminum-Magnesium Based New Material R&D Co., Ltd.-Subsidiary of Xing County Economic and Technological Development Zone, Xing County, 035300, China.
Environ Sci Pollut Res Int. 2022 Nov;29(51):77788-77799. doi: 10.1007/s11356-022-20942-3. Epub 2022 Jun 10.
Heavy metal contamination of water has brought about serious harm to the ecological environment and also threatens human health to a certain extent. In this study, a composite structure comprised of analcime-activated carbon (ANA-AC) was synthesized in situ via a microwave-assisted hydrothermal method using coal gangue (CG) for the potential treatment of Pb from aqueous solution. The products were systematically characterized using XRD, SEM, BET, FTIR, and XPS. The results showed that activated carbon was successfully integrated with the structure of the analcime and the BET surface area of the ANA-AC (20.82 m/g) was much greater than that of the CG (9.33 m/g) and ANA (10.04 m/g) independently. The relationship between Pb adsorption capacity and the initial solution concentration, adsorbent dosages, contact time, pH, and temperature was studied. Under optimal conditions (Pb = 100 mg/L, dosage = 0.1 g, contact time = 6 h, pH = 5.4-6, temperature = 298 K), the maximum adsorption capacity of ANA-AC can reach 100%, which was higher than that of CG and ANA. The Langmuir isotherm model was in good agreement with the data obtained for Pb adsorption, and the pseudo-second-order kinetic model was more suitable for describing the experimental data, showing that chemical adsorption was the controlling step during the adsorption process. In summary, analcime-activated carbon composite prepared from coal gangue could be used as an appropriate adsorbent for Pb adsorption from an aqueous solution.
水体中的重金属污染已对生态环境造成严重危害，在一定程度上也威胁着人类健康。在本研究中，以煤矸石（CG）为原料，通过微波辅助水热法原位合成了由方沸石 - 活性炭（ANA - AC）组成的复合结构，用于从水溶液中潜在去除铅。采用XRD、SEM、BET、FTIR和XPS对产物进行了系统表征。结果表明，活性炭成功地与方沸石结构结合，ANA - AC的BET比表面积（20.82 m²/g）远大于单独的CG（9.33 m²/g）和ANA（10.04 m²/g）。研究了铅吸附容量与初始溶液浓度、吸附剂用量、接触时间、pH值和温度之间的关系。在最佳条件下（铅 = 100 mg/L，用量 = 0.1 g，接触时间 = 6 h，pH = 5.4 - 6，温度 = 298 K），ANA - AC的最大吸附容量可达100%，高于CG和ANA。Langmuir等温线模型与铅吸附实验数据吻合良好，准二级动力学模型更适合描述实验数据，表明化学吸附是吸附过程中的控制步骤。综上所述，由煤矸石制备的方沸石 - 活性炭复合材料可作为从水溶液中吸附铅的合适吸附剂。
