Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.
Bioresour Technol. 2013 Jul;140:406-13. doi: 10.1016/j.biortech.2013.04.116. Epub 2013 May 9.
Biochars prepared from anaerobic digestion residue (BC-R), palm bark (BC-PB) and eucalyptus (BC-E) were used as sorbents for removal of cationic methylene blue dye (MB). The FE-SEM images indicated that the biochars have a well-developed pore structure, and the Brunauer-Emmett-Teller surface areas of BC-R, BC-PB, and BC-E were 7.60, 2.46, and 10.35 m(2)g(-1), respectively. The efficiencies of MB removal in the samples with initial concentrations of 5 mg L(-1) at pH 7.0 and 40°C by BC-R, BC-PB, and BC-E after 2h were 99.5%, 99.3%, and 86.1%, respectively. Pseudo-second-order kinetics was the most suitable model for describing the adsorption of MB onto the biochars. The experimental data were best described by the Langmuir isotherm model, with a maximum monolayer adsorption capacity of 9.50 mg g(-1) at 40°C for BC-R. The biochars produced from the three types of solid waste showed considerable potential for adsorption.
以厌氧消化残渣（BC-R）、棕榈树皮（BC-PB）和桉树（BC-E）为原料制备的生物炭被用作吸附剂，以去除阳离子亚甲基蓝染料（MB）。FE-SEM 图像表明，生物炭具有发达的孔结构，BC-R、BC-PB 和 BC-E 的 Brunauer-Emmett-Teller 比表面积分别为 7.60、2.46 和 10.35 m(2)g(-1)。在初始浓度为 5 mg L(-1)、pH 值为 7.0 和 40°C 的条件下，BC-R、BC-PB 和 BC-E 对 MB 的去除效率在 2 h 后分别为 99.5%、99.3%和 86.1%。准二级动力学模型最适合描述 MB 吸附到生物炭上的过程。实验数据最符合 Langmuir 等温吸附模型，BC-R 在 40°C 时的最大单层吸附容量为 9.50 mg g(-1)。这三种类型的固体废物制备的生物炭在吸附方面表现出了相当大的潜力。
