化石燃料的采输和使用致使土壤中多环芳烃类污染物持续增加,影响了农作物的生长并威胁人类健康。腐植酸(HA)作为土壤中的有机质,含有多种官能团,在光催化降解有机污染物中具有敏化或抑制作用。将HA与TiO2以不同质量比进行复配制备了复合催化材料,考察了材料组成、pH、光源等因素对多环芳烃降解率的影响。采用气相色谱-质谱联用仪(GC-MS)对降解情况进行定量分析,结合傅里叶变换红外光谱仪和X射线光电子能谱仪分析了HA影响TiO2降解作用的机理。结果表明:复合催化材料有利于提高萘和菲的降解率,萘和菲的降解率分别为72.1%和83.3%;HA与纳米TiO2之间产生了静电作用以及配合作用,提高了TiO2表面的催化反应位点。
The extraction,transportation and use of fossil fuels have caused the continuous increase of polycyclic aromatic hydrocarbon pollutants in the soil,affecting the growth of crops and threatening human health.Humic acid (HA),as an organic matter in soil,contains many functional groups,which can sensitize or inhibit the photocatalytic degradation of organic pollutants.Composite catalytic materials were prepared by compounding HA and TiO2 in different mass ratios,and the effects of material composition,pH and light source on the degradation rate of polycyclic aromatic hydrocarbons were investigated.The degradation was quantitatively analyzed by gas chromatography-mass spectrometry (GC-MS),and the mechanism of HA affecting the degradation of TiO2 was analyzed by Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy.The results showed that the composite catalytic materials were beneficial to improve the degradation rates of naphthalene and phenanthrene,and the degradation rates of naphthalene and phenanthrene were 72.1% and 83.3%,respectively.The electrostatic interaction and coordination between HA and nano-TiO2 had been generated,and the catalytic reaction sites on the surface of TiO2 had been improved.
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基金资助
陕西省重点研发计划项目(2021SF-431);陕西省油气井及储层渗流与岩石力学重点实验室项目(WSFRM20200303001);自然资源部退化及未利用土地整治工程重点实验室项目(SXDJ2018-01)
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