以薰衣草提取液为还原剂,白酒废水污泥生物炭(WSB)为载体,采用绿色合成法制备了生物炭负载纳米零价铁复合材料(nZVI@WSB),并将其用于亚甲基蓝(MB)废水的处理,利用扫描电子显微镜-能谱(SEM-EDS)、透射电镜(TEM)、全自动比表面及孔隙度分析仪(BET)、傅立叶变换红外光谱(FT-IR)、X射线衍射图谱(XRD)和X射线光电子能谱(XPS)等手段对nZVI@WSB进行了表征,并考察了其对MB的吸附性能。结果表明:nZVI@WSB的比表面积和孔容增大、稳定性和反应活性增强。在投加量1.0g/L和不调节溶液初始pH的反应体系中,MB的去除率随着初始浓度的增加而升高,而升温也有利于MB的去除。nZVI@WSB对MB的吸附过程分别符合准二级动力学方程、Langmuir和Redlich-Peterson等温方程。热力学研究表明,nZVI@WSB吸附MB是自发、熵增的吸热过程。
The biochar supported nanoscale zerovalent iron composite (nZVI@WSB) was prepared by green synthesis method using lavender extracts as reductant and liquor wastewater sludge biochar (WSB) as carrier and used to remove methylene blue (MB) from water.The nZVI@WSB was characterized by scanning electron microscopy (SEM-EDS),transmission electron microscopy (TEM),Brunauer-Emmett-Teller (BET),Fourier transform infrared spectroscopy (FT-IR),X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS),and the adsorption performance was investigated.The results showed that the specific surface area and pore volume of nZVI@WSB increased,and the stability and reactivity were enhanced.In the reaction system with the dosage of 1.0g/L and the initial pH of the solution not adjusted,the removal rate of MB increased with the increase of the initial concentration,and the increase of temperature was also beneficial to the removal of MB.The adsorption kinetics and adsorption isotherm of MB adsorption by nZVI@WSB were in accordance with the pseudo-second-order kinetics model,Langmuir and Redlich-Peterson model.Thermodynamic studies revealed that the adsorption process of MB onto nZVI@WSB was an endothermic process with spontaneous entropy increase.
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基金资助
伊犁师范大学校级科研项目(2022YSYB024);新疆自治区高校科研计划自然科学青年项目(XJEDU2021Y045)
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