Zhou Yarui, Zhang Hailong, Cai Lu, Guo Jian, Wang Yaning, Ji Lili, Song Wendong
College of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan 316022, China.
Institute of Innovation & Application, Zhejiang Ocean University, Zhoushan 316022, China.
Materials (Basel). 2018 Sep 13;11(9):1709. doi: 10.3390/ma11091709.
In this study, carbonized kelp biochar (AKB) modified by KOH impregnation and photocatalytic Bi₂MoO₆/AKB composite (BKBC) nanomaterials were the first time successfully synthesized for efficient removal of dyes in aqueous solution. BET, XRD, FT-IR, and SEM were employed to characterize as-prepared samples. UV-vis and other test results indicated that the removal efficiency of methylene blue (MB) was 61.39% and 94.12% for BKBC and AKB, respectively, which was up to 13 times and 20 times higher in comparison with pure Bi₂MoO₆ (PBM). In addition, the equilibrium adsorption capacity of MB could reach up to 324.1 mg/g for AKB. This high dyes adsorption performance could be likely attributed to its high specific surface area (507.177 m²/g) and its abundant presence of various functional groups such as ⁻OH and =C⁻H on AKB. Particularly, the existing of amorphous carbon and transition metal oxides, such as Fe₂O₃ and Mn₅O₈, could be beneficial for the photodegradation of MB for AKB. Meanwhile, experimental data indicated that adsorption kinetics complied with the pseudo-second order model well, and all of the tests had satisfactory results in terms of the highly efficient adsorption and photodegradation activity of AKB nanomaterials, which suggested its great potential in wastewater treatment.
在本研究中，首次成功合成了经KOH浸渍改性的碳化海带生物炭（AKB）和光催化Bi₂MoO₆/AKB复合材料（BKBC）纳米材料，用于高效去除水溶液中的染料。采用BET、XRD、FT-IR和SEM对所制备的样品进行表征。紫外可见光谱和其他测试结果表明，BKBC和AKB对亚甲基蓝（MB）的去除率分别为61.39%和94.12%，与纯Bi₂MoO₆（PBM）相比分别高出13倍和20倍。此外，AKB对MB的平衡吸附容量可达324.1 mg/g。这种高染料吸附性能可能归因于其高比表面积（507.177 m²/g）以及AKB上大量存在的各种官能团，如-OH和=C-H。特别地，非晶碳和过渡金属氧化物（如Fe₂O₃和Mn₅O₈）的存在可能有利于AKB对MB的光降解。同时，实验数据表明吸附动力学很好地符合准二级模型，并且所有测试在AKB纳米材料的高效吸附和光降解活性方面都取得了令人满意的结果，这表明其在废水处理中具有巨大潜力。
