Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, PR China.
Bioresour Technol. 2011 Oct;102(19):8877-84. doi: 10.1016/j.biortech.2011.06.078. Epub 2011 Jun 26.
Biochars produced by pyrolysis of hardwood at 450 °C (HW450) and corn straw at 600 °C (CS600) were characterized and investigated as adsorbents for the removal of Cu(II) and Zn(II) from aqueous solution. The adsorption data were well described by a Langmuir isotherm, with maximum Cu(II) and Zn(II) adsorption capacities of 12.52 and 11.0 mg/g for CS600, 6.79 and 4.54 mg/g for HW450, respectively. Thermodynamic analysis suggested that the adsorption was an endothermic process and did not occur spontaneously. Although Cu(II) adsorption was only marginally affected by Zn(II), Cu(II) competed with Zn(II) for binding sites at Cu(II) and Zn(II) concentrations ≥ 1.0mM. Results from this study indicated that plant-residue or agricultural waste derived biochar can act as effective surface sorbent, but their ability to treat mixed waste streams needs to be carefully evaluated on an individual basis.
通过在 450°C 下热解硬木（HW450）和在 600°C 下热解玉米秸秆（CS600）制备的生物炭被用作吸附剂，用于从水溶液中去除 Cu(II)和 Zn(II)。吸附数据很好地符合 Langmuir 等温线，CS600 对 Cu(II)和 Zn(II)的最大吸附容量分别为 12.52 和 11.0mg/g，HW450 分别为 6.79 和 4.54mg/g。热力学分析表明，吸附是一个吸热过程，不会自发发生。尽管 Cu(II)吸附仅受到 Zn(II)的轻微影响，但在 Cu(II)和 Zn(II)浓度≥1.0mM 时，Cu(II)与 Zn(II)竞争结合位点。本研究结果表明，植物残余物或农业废物衍生的生物炭可以作为有效的表面吸附剂，但需要根据具体情况仔细评估它们处理混合废物的能力。
