铁浸渍比对 KOH 活化生物炭去除四环素和重金属性能及吸附的影响。
Effect of iron impregnation ratio on the properties and adsorption of KOH activated biochar for removal of tetracycline and heavy metals.
机构信息
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
出版信息
Bioresour Technol. 2023 Jul;380:129081. doi: 10.1016/j.biortech.2023.129081. Epub 2023 Apr 24.
The effect of iron impregnation ratio on magnetic biochars (MBCs) prepared by biomass pyrolysis accompanied by KOH activation has been less reported. In this study, MBCs were produced by one-step pyrolysis/KOH-activation of walnut shell, rice husk and cornstalk with different impregnation ratios (0.3-0.6). The properties, adsorption capacity and cycling performance for Pb(II), Cd(II) and tetracycline of MBCs were determined. MBCs prepared with low impregnation ratio (0.3) showed stronger adsorption capacity on tetracycline. The adsorption capacity of WS-0.3 toward tetracycline was up to 405.01 mg g, while that of WS-0.6 was only 213.81 mg g. It is noteworthy that rice husk and cornstalk biochar with an impregnation ratio of 0.6 were more effective in removing Pb(II) and Cd(II), and the content of Fe crystals on surface strengthened the ion exchange and chemical precipitation. This work highlights that the impregnation ratio should be changed according to the actual application scenarios of MBC.
铁浸渍比对生物质热解协同 KOH 活化制备的磁性生物炭（MBC）的影响报道较少。本研究采用一步热解/KOH 活化法，以核桃壳、稻壳和玉米秸秆为原料，制备了不同浸渍比（0.3-0.6）的 MBC。测定了 MBC 的性质、对 Pb(II)、Cd(II)和四环素的吸附容量和循环性能。低浸渍比（0.3）制备的 MBC 对四环素具有更强的吸附能力。WS-0.3 对四环素的吸附容量高达 405.01 mg g，而 WS-0.6 仅为 213.81 mg g。值得注意的是，浸渍比为 0.6 的稻壳和玉米秸秆生物炭更有效地去除了 Pb(II)和 Cd(II)，表面上的 Fe 晶体含量增强了离子交换和化学沉淀。这项工作强调了浸渍比应根据 MBC 的实际应用场景进行调整。
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