CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong, 264003, PR China.
School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong, 264025, PR China.
Chemosphere. 2020 Jul;250:126257. doi: 10.1016/j.chemosphere.2020.126257. Epub 2020 Feb 19.
Magnetic algal carbon supported flower-like sulfidated nanoscale zerovalent iron (S-nZVI/AC) composite was firstly synthesized through one-pot method and used for removing bromate. More than 98% of bromate was efficiently removed within 48 min. Compared with the individual S-nZVI treatment, the removal rate constant of the S-nZVI/AC composite treatment was almost doubled. The removal rate constant of bromate increased three times when the S/Fe ratio increased from 0 to 0.3. According to the synergistic effect between the algal carbon and S-nZVI on the bromate removal, the introduction of carbon and sulfide-modification of nZVI were efficient modification approaches for enhancing the removal of bromated using S-nZVI/AC composite. The removal efficiency of bromate increased sharply to more than 98% when the composite dose increased from 0 to 40 mg L. The removal rate constant increased linearly from 0.08 to 0.31 min when the initial concentration increased from 50 to 200 μg L. The removal efficiency of the bromate still maintained at high level (>85%) after 5 recycles of the S-nZVI/AC composite. Bromate was readily removed under neutral or slight acidic conditions. The bromate removal rate constant increased from 0.10 to 0.27 min when the temperature increased from 15 to 35 °C. The bromate removal rate constant increased almost 4 times when the ionic strength increased from 0 to 3 g L. This study demonstrates that S-nZVI/AC composite synthesized through one-pot method is a promising water purification material for efficient removal of bromated disinfection by-product.
磁性藻类碳负载花状硫化纳米零价铁（S-nZVI/AC）复合材料通过一锅法首次合成，并用于去除溴酸盐。在 48 min 内，超过 98%的溴酸盐被有效去除。与单独的 S-nZVI 处理相比，S-nZVI/AC 复合材料处理的去除速率常数几乎增加了一倍。当 S/Fe 比从 0 增加到 0.3 时，溴酸盐的去除速率常数增加了三倍。根据藻类碳和 S-nZVI 对溴酸盐去除的协同作用，引入碳和 nZVI 的硫化改性是增强使用 S-nZVI/AC 复合材料去除溴酸盐的有效改性方法。当复合材料剂量从 0 增加到 40 mg/L 时，溴酸盐的去除效率急剧增加到 98%以上。当初始浓度从 50 增加到 200μg/L 时，去除速率常数从 0.08 线性增加到 0.31 min。S-nZVI/AC 复合材料经过 5 次循环后，溴酸盐的去除效率仍保持在较高水平（>85%）。在中性或弱酸性条件下，溴酸盐很容易被去除。当温度从 15°C 升高到 35°C 时，溴酸盐的去除速率常数从 0.10 增加到 0.27 min。当离子强度从 0 增加到 3 g/L 时，溴酸盐的去除速率常数增加了近 4 倍。本研究表明，通过一锅法合成的 S-nZVI/AC 复合材料是一种有前途的水净化材料，可有效去除溴酸盐消毒副产物。
