Bogusz Aleksandra, Nowak Katarzyna, Stefaniuk Magdalena, Dobrowolski Ryszard, Oleszczuk Patryk
Department of Environmental Chemistry, Faculty of Chemistry, Maria Skłodowska-Curie University, Maria Curie-Skłodowska Square 3, 20-031, Lublin, Poland.
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290, Lublin, Poland.
J Environ Manage. 2017 Oct 1;201:268-276. doi: 10.1016/j.jenvman.2017.06.019. Epub 2017 Jul 1.
The objective of the study was to investigate the ability of biochars prepared under different temperatures (400 °C and 600 °C) from the residue of biogas production (RBP) for the adsorption of cadmium (Cd(II)) and nickel (Ni(II)) ions from aqueous solution. Furthermore, the RBP biochars adsorption capacity was compared with adsorption capacity of biochar produced from wheat straw at 600 °C (BCS600). The kinetics of the adsorption, the sorption isotherms, the influence of solution pH and the interfering ions (chlorides and nitrates) were investigated. The desorption of Cd(II) and Ni(II) by hydrochloric and nitric acid from biochars was also investigated. The different types of feedstock used for biochar (BC) preparation (RBP and biomass) determined the physico-chemical properties of biochars and hence their adsorption abilities. Generally, biochars produced from RBPs (regardless of temperature) had the greater capacity to adsorb Cd(II) and Ni(II) than the biochar produced from wheat straw. Of the tested models (Freundlich and Langmuir), the Langmuir model was demonstrated to be the best to describe the sorption of Cd(II) and Ni(II). For the kinetic study, the adsorption process proceeded the fastest for BCU400 than BCU600. Furthermore, BCU600 was the most resistant to the influence of interfering ions on adsorption. For the desorption study, BCU400 was characterized by the highest reproducibility of the surface. The comparison of the results obtained in each adsorption step between RBP biochars and BCS600 suggested that the residue from biogas production could be successfully applied for the removal of Cd(II) and Ni(II) ions from aqueous solutions.
本研究的目的是调查由沼气生产残渣（RBP）在不同温度（400℃和600℃）下制备的生物炭对水溶液中镉（Cd(II)）和镍（Ni(II)）离子的吸附能力。此外，将RBP生物炭的吸附容量与600℃下由小麦秸秆制备的生物炭（BCS600）的吸附容量进行了比较。研究了吸附动力学、吸附等温线、溶液pH值的影响以及干扰离子（氯化物和硝酸盐）的影响。还研究了盐酸和硝酸对生物炭中Cd(II)和Ni(II)的解吸情况。用于制备生物炭（BC）的不同类型原料（RBP和生物质）决定了生物炭的物理化学性质，进而决定了它们的吸附能力。一般来说，由RBP制备的生物炭（无论温度如何）比由小麦秸秆制备的生物炭具有更强的吸附Cd(II)和Ni(II)的能力。在测试的模型（Freundlich和Langmuir）中，Langmuir模型被证明是描述Cd(II)和Ni(II)吸附的最佳模型。对于动力学研究，BCU400的吸附过程比BCU600进行得更快。此外，BCU600对干扰离子对吸附的影响最具抗性。对于解吸研究，BCU400的表面具有最高的重现性。RBP生物炭和BCS600在每个吸附步骤中获得的结果比较表明，沼气生产残渣可成功用于从水溶液中去除Cd(II)和Ni(II)离子。
