Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (7): 643-650.doi: 10.11934/j.issn.1673-4831.2018.07.010

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Adsorption of Pb in Solution By Modified Bean Cake Biochar

MENG Li-rong1, YU Hao-dan1, YANG Ting-ting1, YIN Wei-qin1, HOU Jian-hua1,2, WANG Sheng-sen1,2, WANG Xiao-zhi1,2,3   

  1. 1. College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China;
    2. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China;
    3. Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou 225127, China
  • Received:2018-03-07 Online:2018-07-25 Published:2018-07-25


In this study, bean cake derived biochar (SYB) was modified by potassium hydroxide (KOH) (SYBK) to improve sorptive removal of Pb2+ from aqueous solutions. Batch sorption experiments were carried out with different sorption time, initial sorbate concentrations and pH values. The pristine and Pb2+ spent sorbents were characterized with the field emission scanning electron microscopy (SEM), specific surface area and pore size analyzer (BET), X-ray spectrometer (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Results show that the SYBK has more abundant surface functional groups and higher specific surface area. Pb2+ adsorption data by SYB and SYBK were well fitted with the Langmuir adsorption model and the predicted maximum adsorption capacities were 711.0 and 293.0 mg·g-1 for SYBK and SYB, respectively. The XRD spectra of both spent sorbents revealed that Pb3(CO3)2(OH)2 precipitate was formed after sorption reaction. Besides, large quantities of alkaline cations (e. g., Ca2+ and Mg2+) was released into solution after sorption. The results above can provide reference for preparation of biochar-based sorbents for Pb2+ removal from aqueous solutions.

Key words: bean cake, biochar, modification, Pb2+

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