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 H2 O2 for the removal of p-nitrophenol(PNP)from water.The effects of H2 O2 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:H2 O2 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℃.
Fe-N co-doped biocharFenton catalystcatalytic oxidation of p-nitrophenolFe(Ⅲ)/Fe(Ⅱ)cyclereactive nitrogen
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