Ag-N-C-P掺杂TiO_(2)改性沙柳活性炭的结构和再生性能

The Structure and Regeneration Performance of Activated Carbon Modified by Ag-N-C-P Doped TiO_(2)

为提高TiO_(2)负载活性炭(AC)的可见光催化再生速率,采用非金属(N、C、P)-金属(Ag)多元素的协同作用对其进行改性。结果表明:Ti以Ti^(4+)形式存在,Ag以银单质形式修饰TiO_(2),N在TiO_(2)晶格中形成间隙氮,P在TiO_(2)晶格形成了Ti-O-P键。Ag掺杂对抑制TiO_(2)电子-空穴复合的效果低于N,但由于N元素在制备过程中,容易以气体形式逃逸,样品中保留较少,因此N掺杂改性再生效果较Ag差。虽然Ag和N掺杂使样品孔隙减少,但样品的含氧官能团含量增加,改性后样品的吸附性能得到了增强,且多元素掺杂对抑制电子-空穴复合效果最佳,因此Ag-N-C-P掺杂TiO_(2)改性AC表现出最优的再生速率和性能,从而实现了TiO_(2)改性AC的高效再生。

In order to improve the regeneration rate of activated carbon(AC)under visible light,TiO_(2) was modified by the nonmetal(N,C,P)and metal(Ag)elements and then loaded on AC.The results showed that Ti existed in the form of Ti^(4+),Ag modified TiO_(2) in the form of silver atom,N formed interstitial N in the TiO_(2) lattice,and P formed Ti-O-P bond in the TiO_(2) lattice.Although the effect of Ag doping on the inhibition of TiO_(2) electron-hole recombination was lower than that of N,the regeneration performance of TiO_(2)/AC modified by Ag was better than that modified by N.This was because N element was easy to escape in gas form during the preparation process and less retained in the sample.Although Ag and N doping reduced the sample porosity,the content of oxygen-containing functional groups increased,thus the adsorption performance of the modified sample was enhanced.Moreover,multi-element doping had the best effect on the inhibition of electron-hole recombination.Therefore,Ag-N-C-P doped TiO_(2) modified AC showed the best regeneration rate and performance.