以自然界中广泛存在且廉价易得的松针作为生物炭的前驱体,采用高温热解法制备了铁掺杂生物炭(Fe-BC)和铁氮共掺杂生物炭(Fe-N1-BC、Fe-N2-BC和Fe-N3-BC),并将其用于活化H₂O₂去除水体中的对硝基苯酚(PNP)。考察了H₂O₂浓度、污染物质量浓度、材料投加质量浓度、初始pH以及温度等因素对PNP去除率的影响。结果表明,Fe-BC、Fe-N1-BC、Fe-N2-BC、Fe-N3-BC体系中·OH浓度为9.2、10.24、12.4、13.62 μmol/L,PNP的去除率分别为45.36 %、60 %、75.98 %和77.72 %,体系的·OH浓度越高PNP的去除率也越高,Fe-N3-BC对PNP表现出最高的催化降解性能。对PNP去除的最佳影响因素为:H₂O₂浓度为0.15 mol/L、PNP质量浓度为10 mg/L、催化剂投加质量浓度为0.25 g/L、溶液初始pH=5.48和溶液温度为25 ℃。

Iron-doped biochar (Fe-BC) and iron-nitrogen co-doped biochar (Fe-N1-BC,Fe-N2-BC,and Fe-N3-BC) are prepared via a high-temperature pyrolysis method by using pine needles,which are widely available in nature,cheap and easy to obtain,as the precursors of the biochar,and used to activate H₂O₂ for the removal of p-nitrophenol (PNP) from water.The effects of H₂O₂ concentration,pollutant mass concentration,material injection mass concentration,initial pH,and temperature on PNP removal are investigated.The results show that the removal rates of PNP are 45.36 %,60 %,75.98 %,and 77.72 % respectively in Fe-BC,Fe-N1-BC,Fe-N2-BC,and Fe-N3-BC systems with·OH concentrations of 9.2,10.24,12.4,and 13.62 μmol·L^-1,respectively.The higher the concentration of·OH,the higher the removal rate of PNP.Fe-N3-BC shows the highest catalytic degradation performance for PNP.The optimal factors for the removal of PNP are as follows:H₂O₂ concentration is 0.15 mol·L^-1,the mass concentration of PNP is 10 mg·L^-1,the mass concentration of catalyst added is 0.25 g·L^-1,the initial pH of the solution is 5.48,and solution temperature is 25℃.