The purpose of this study was to develop an efficient method of biochar modification for effective removal of Se(VI) ions from water. Commercially available biochar produced from wheat straw was impregnated by Fe(NO₃)₃ (0.8, 4 and 10% w/v) and pyrolyzed at 200 °C. Optimum pH, adsorption kinetics, and Se(VI) adsorption isotherms were determined for the studied biochars. The modification significantly increased biochar’s ability for Se(VI) adsorption. The biochar modified with 10% Fe(NO₃)₃ has the highest adsorption effectiveness. The experimentally determined maximum adsorption capacity for the biochar modified with 10% Fe(NO₃)₃ was 14.3 mg g⁻¹ for pH 5, which was the optimum pH value. X-Ray Photoelectron Spectroscopy (XPS) and Photoacoustic Fourier Transform Infrared Spectroscopy (FTIR-PAS) investigation confirmed the presence of iron oxides/hydroxides on the surface of the modified biochar. The modification also resulted in the formation of oxygen containing functional groups. The study proved that the proposed modification can be efficient in increasing the biochar effectiveness in removing Se(VI) from water.

这项研究的目的是开发一种有效的生物炭改性方法，以从水中有效去除Se（VI）离子。由小麦秸秆生产的市售生物炭用Fe（NO ₃）₃（0.8、4和10％w / v）浸渍，并在200°C下热解。确定了所研究生物炭的最佳pH，吸附动力学和Se（VI）吸附等温线。改性显着提高了生物炭对Se（VI）吸附的能力。用10％Fe（NO ₃）₃改性的生物炭具有最高的吸附效率。实验确定的用10％Fe（NO ₃）₃改性的生物炭的最大吸附容量为14.3 mg g ^-1pH值为5，这是最佳pH值。X射线光电子能谱（XPS）和光声傅里叶变换红外光谱（FTIR-PAS）研究证实了改性生物炭表面上存在氧化铁/氢氧化铁。修饰还导致形成含氧官能团。研究证明，所提出的修饰可以有效提高生物炭从水中去除Se（VI）的有效性。