蔗渣纤维素基Zn_(3)In_(2)S_(6)光催化降解2,4-二氯苯酚的研究

Study on the Photocatalytic Degradation of 2,4-Dichlorophenol by Bagasse Cellulose Based Zn_(3)In_(2)S_(6)

文章研究采用蔗渣纤维素和Zn_(3)In_(2)S_(6)为原料,通过化学交联法成功制备了蔗渣纤维素基Zn_(3)In_(2)S_(6)(SBC@ZIS)光催化剂,并利用SBC@ZIS光催化降解2,4-二氯苯酚(2,4-DCP)。运用FT-IR、紫外可见漫反射、SEM-EDS、XPS和XRD对SBC@ZIS物理特性进行表征,并运用高效液相色谱和TOC分析SBC@ZIS降解2,4-DCP的性能。FT-IR和XRD结果证实了SBC与ZIS的结合未显著改变ZIS的结构。通过SEM-EDS表征发现,SBC载体上具有O、C、Zn、In和S元素,在XPS表征中,SBC@ZIS表现出与ZIS同样的衍射峰,两者表征均证明了ZIS很好地负载在SBC上。紫外可见漫反射表明ZIS固定于SBC后,其光吸收范围发生了红移,即从524 nm红移至600 nm,表明SBC@ZIS有利于提高ZIS在可见光下的吸收范围。通过单因素实验可知,在最优条件下,SBC@ZIS对2,4-DCP(50 mg/L)的降解率可达87%,相较于单独ZIS光催化提高了10个百分点。并且总有机碳的去除率达到了71%,相较于ZIS提高了17个百分点。将Zn_(3)In_(2)S_(6)负载于蔗渣纤维素上,有利于提高回收利用性和光催化性能,为2,4-DCP的高效降解提供一种新的思路。

In this study,bagasse cellulose based Zn_(3)In_(2)S_(6)(SBC@ZIS)photocatalyst was prepared by chemical crosslinking method using bagasse cellulose and Zn_(3)In_(2)S_(6) as raw materials.And 2,4-dichlorophenol(2,4-DCP)was degraded by SBC@ZIS.Physical characteristics of SBC@ZIS were analyzed by FT-IR,UV visible diffuse reflection,SEM-EDS,XPS and XRD.Performance of SBC@ZIS for 2,4-DCP degradation was analyzed by high performance liquid chromatography and TOC.The FT-IR and XRD results confirmed that the binding of SBC with ZIS did not significantly alter the structure of ZIS.Through SEM-EDS characterization,it was found that there were O,C,Zn,In,and S elements on the SBC carrier.In XPS characterization,SBC@ZIS exhibited the same diffraction peak as ZIS.The SEM-EDS and XPS characterizations demonstrated that ZIS was well loaded on SBC.The UV-Vis diffuse reflection showed that the light absorption range of ZIS was red shifted from 524 nm to 600 nm after it was fixed in SBC,indicating that SBC@ZIS is conducive to improving the absorption range of ZIS in visible light.Through single factor experiments,it can be concluded that under optimal condi⁃tions,the degradation rate of 2,4-DCP(50 mg/L)by SBC@ZIS can reach 87%,which is 10 percentage points higher than that by ZIS alone.And the removal rate of TOC reached 71%,which is 17 percentage points higher than ZIS.Loading Zn_(3)In_(2)S_(6) onto bagasse cellulose not only improves its recycling efficiency,but also enhances its photocatalytic performance,providing a new approach for the efficient degradation of 2,4-DCP.