Meng Wenchao, Li Xiaodi, Yu Junxia, Xiao Chunqiao, Hou Haobo, Chi Ruan, Feng Guoqing
Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, No. 693 Xiongchu Avenue, Hongshan District, Wuhan, 430074, Hubei, China.
Wuhan Univ. (Zhaoqing) GD, HK and MO Environ Technol Research INST, Zhaoqing, Guangdong, China.
Environ Sci Pollut Res Int. 2023 Apr;30(20):57410-57422. doi: 10.1007/s11356-023-26612-2. Epub 2023 Mar 25.
Ferrihydrite-loaded water hyacinth-derived biochar (FH/WHBC) was prepared by in-situ precipitation method to treat glyphosate-containing wastewater. The adsorption properties and mechanism, and actual application potential were deeply studied. Results showed that the adsorption performance of FH/WHBC was closely related with the precipitation pH condition, and the adsorbent prepared at pH 5.0 possessed the highest adsorption capacity of 116.8 mg/g for glyphosate. The isothermal and kinetic experiments showed that the adsorption of glyphosate was consistent with Langmuir model, and the adsorption process was rapid and could be achieved within 30 min. The prepared FH/WHBC was more suitable for application under high acidity environment, and could maintain the great adsorption performances in the presence of most co-existing ions. Besides, it also possessed a good regenerability. Under dynamic condition, the adsorption performance of FH/WHBC was not affected even at high flow rate and high glyphosate concentration. Furthermore, the FH/WHBC can keep excellent removal efficiency for glyphosate in wastewater treatment, and the concentration of glyphosate can be reduced to 0.06 mg·L, which was lower than the groundwater quality of class II mandated in China. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) characterization indicated that the adsorption of glyphosate on FH/WHBC was mainly accomplished through electrostatic adsorption and the formation of inner-sphere complexes. In brief, the prepared sorbent FH/WHBC was expected to be used in the treatment of industrial glyphosate wastewater.
通过原位沉淀法制备了负载水铁矿的凤眼莲衍生生物炭（FH/WHBC），用于处理含草甘膦废水。深入研究了其吸附性能、机理及实际应用潜力。结果表明，FH/WHBC的吸附性能与沉淀pH条件密切相关，在pH 5.0条件下制备的吸附剂对草甘膦的吸附容量最高，为116.8 mg/g。等温吸附和动力学实验表明，草甘膦的吸附符合Langmuir模型，吸附过程迅速，30 min内即可完成。制备的FH/WHBC更适合在高酸度环境下应用，在大多数共存离子存在的情况下仍能保持良好的吸附性能。此外，它还具有良好的可再生性。在动态条件下，即使在高流速和高草甘膦浓度下，FH/WHBC的吸附性能也不受影响。此外，FH/WHBC在废水处理中对草甘膦能保持优异的去除效率，可将草甘膦浓度降低至0.06 mg·L，低于中国规定的地下水Ⅱ类水质标准。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）表征表明，草甘膦在FH/WHBC上的吸附主要通过静电吸附和内球络合物的形成来实现。简而言之，制备的吸附剂FH/WHBC有望用于工业草甘膦废水的处理。
