Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2014;21(11):7035-46. doi: 10.1007/s11356-014-2627-z. Epub 2014 Feb 18.
The purpose of this study was to investigate adsorption characteristic of swine manure biochars pyrolyzed at 400 °C and 700 °C for the removal of Cu(II) ions from aqueous solutions. The biochars were characterized using BET surface area, Fourier transform infrared spectroscopy (FTIR), zeta potential, scanning electron microscopy/energy dispersive spectrometer (SEM-EDS), and X-ray diffraction (XRD). The adsorption of Cu(II) ions by batch method was carried out and the optimum conditions were investigated. The adsorption processes of these biochars are well described by a pseudo-second-order kinetic model, and the adsorption isotherm closely fitted the Sips model. Thermodynamic analysis suggested that the adsorption was endothermic. The maximum Cu(II) adsorption capacities of biochars derived from fresh and composted swine manure at 400 °C were 17.71 and 21.94 mg g(-1), respectively, which were higher than those at 700 °C. XRD patterns indicated that the silicate and phosphate particles within the biochars served as adsorption sites for Cu(II). The removal of Cu(II) ions from industrial effluent indicated that the fresh swine manure biochar pyrolyzed at 400 °C can be considered as an effective adsorbent.
本研究旨在探讨 400°C 和 700°C 热解制备的猪粪生物炭对水溶液中 Cu(II)离子的吸附特性。采用 BET 比表面积、傅里叶变换红外光谱（FTIR）、Zeta 电位、扫描电子显微镜/能谱（SEM-EDS）和 X 射线衍射（XRD）对生物炭进行了表征。采用批量法进行 Cu(II)离子吸附实验，考察了最佳条件。这些生物炭的吸附过程很好地符合准二级动力学模型，吸附等温线与 Sips 模型拟合较好。热力学分析表明吸附是吸热的。在 400°C 下，由新鲜猪粪和堆肥猪粪制备的生物炭的最大 Cu(II)吸附容量分别为 17.71 和 21.94mg g(-1)，均高于 700°C 下的吸附容量。XRD 图谱表明，生物炭中的硅酸盐和磷酸盐颗粒作为 Cu(II)的吸附位点。从工业废水中去除 Cu(II)离子表明，400°C 热解的新鲜猪粪生物炭可以作为一种有效的吸附剂。
