State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai China.
College of Environmental Science and Engineering, Tongji University, Shanghai, China.
J Air Waste Manag Assoc. 2019 Jan;69(1):58-70. doi: 10.1080/10962247.2018.1510441. Epub 2018 Nov 15.
Molten salt has been regarded as a versatile and environmental-friendly method for the material preparation and waste destruction. In this work, molten FeCl3 was utilized for the generation of magnetic biochar (MBC) derived from simultaneous activation and magnetization of biomass. The sample characterization indicated that MBC had a rough surface with BET surface area of 404 m2/g and total pore volume of 0.35cm3/g. Highly dispersed Fe3O4 and nitrogen could be deposited on the surface, leading to an excellent magnetization property. The MBC exhibited a great 2,4-Dichlorophenol (2.4-DCP) and atrazine removal performance in solution with the maximum adsorption capacity achieved 298.12 mg/g and 102.17 mg/g. Kinetics results demonstrated that MBC adsorption met the Pseudo-first-order model better. Molten NaOH-Na2CO3 was provided for the re-activation of exhausted MBC. 2,4-DCP was firstly desorbed from the MBC and subsequently destructed by the active species in the melt medium. Chlorine can be captured in the molten alkaline medium from the XRD pattern of residues.The MBC could be easily recovered with a yield of 98.2% and fixed carbon content of 61.0% after the molten salt regeneration process. With no 2,4-DCP detected, 65.5% and 31.69% of initial Cl was found in washing water and residues with the molten NaOH-Na2CO3, respectively. After 4 cycles of regeneration and adsorption, 60.55%-72.22% of initial adsorption capacity can be kept. This preparation and regeneration method can be an effective way to reduce the risk of secondary pollution of chlorinated organic compounds during adsorbent regeneration.: Molten salt (MS) is a salt or multiple salts with a low melting point, and has been applied in many sectors and is regarded as a crucial role in terms of energy, environmental, and resource sustainability. In our paper, magnetic biochar was prepared by one-step activation and magnetization of fir dust using molten FeCl∙6HO. Meanwhile, a regeneration method using molten alkaline salt was provided. Magnetic biochar generated in our study performed well in the 2,4-dichlorophenol and atrazine adsorption. After four cycles of regeneration and adsorption, 72.2% of initial 2,4-DCP adsorption capacity can be kept.
熔融盐作为一种通用且环保的材料制备和废物破坏方法，受到了广泛关注。本工作利用熔融 FeCl3 对生物质进行同时活化和磁化，制备了磁性生物炭（MBC）。样品表征结果表明，MBC 具有粗糙的表面，BET 比表面积为 404 m2/g，总孔体积为 0.35cm3/g。高度分散的 Fe3O4 和氮可以沉积在表面上，从而赋予其优异的磁性。在溶液中，MBC 对 2,4-二氯苯酚（2.4-DCP）和莠去津表现出良好的去除性能，最大吸附容量分别达到 298.12 mg/g 和 102.17 mg/g。动力学结果表明，MBC 吸附更符合准一级动力学模型。熔融的 NaOH-Na2CO3 用于再生耗尽的 MBC。2,4-DCP 首先从 MBC 上解吸，然后在熔融介质中的活性物种作用下被破坏。从残渣的 XRD 图谱中可以捕获来自氯的信号。通过熔融盐再生过程，MBC 可以很容易地回收，产率为 98.2%，固定碳含量为 61.0%。用熔融的 NaOH-Na2CO3 洗涤后，水中和残渣中初始 Cl 的含量分别为 65.5%和 31.69%，均未检出 2,4-DCP。经过 4 次再生和吸附循环，初始吸附容量的 60.55%-72.22%仍能保持。这种制备和再生方法可有效降低吸附剂再生过程中氯化有机化合物二次污染的风险。：熔融盐（MS）是一种低熔点的盐或多种盐，已广泛应用于多个领域，并被认为在能源、环境和资源可持续性方面发挥着至关重要的作用。在我们的论文中，使用熔融 FeCl∙6HO 一步法活化和磁化枞木粉制备了磁性生物炭。同时，提供了一种使用熔融碱性盐的再生方法。我们研究中生成的磁性生物炭在 2,4-二氯苯酚和莠去津的吸附方面表现良好。经过 4 次再生和吸附循环，初始 2,4-DCP 吸附容量的 72.2%仍能保持。
