Absalan Yahya, Gholizadeh Mostafa, Razavi Mohammad Reza, Dastani Zeynab, Vu Anh Thi Ngoc, Kovalchukova Olga
Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, IR Iran.
Department of chemistry, Georgia University, Athens, GA 30602, USA.
R Soc Open Sci. 2022 Aug 24;9(8):220080. doi: 10.1098/rsos.220080. eCollection 2022 Aug.
In this study, a composite bearing titanium carbide (TiC), titanium dioxide (TiO), polyvinyl alcohol and xylan (TiC@C-anatase/rutile@polyvinyl alcohol/xylan) was synthesized and applied as a photocatalyst for the degradation of bromophenol blue (BPB) solution through several steps. Nanostructure of TiC and TiO in the anatase and rutile phases was obtained through heat treatment of TiC at different times and temperatures (TiC@AR) which led to a reduction in energy bandgap from UV to visible light, in addition to the enhancement of the surface activity. After TiC@AR polymerization by xylan and polyvinyl alcohol and obtaining TiC@AR/PX, the energy bandgap reduced to IR range (52% of the sunlight) while showing an enhancement in the surface activity. The photocatalytic activity of the compounds was tested by studying the decomposition of BPB solution under visible light. The result illustrated the ability of TiC and TiC@AR to decrease the concentration of BPB after 150 min by 35% and 37%, respectively, while this reduction was 72% for TiC@AR/PX. Considering the effective parameters, the energy bandgap and the surface layer played key roles in photocatalytic degradation.
在本研究中，通过几个步骤合成了一种复合载体碳化钛（TiC）、二氧化钛（TiO）、聚乙烯醇和木聚糖（TiC@C-锐钛矿/金红石@聚乙烯醇/木聚糖），并将其用作光催化剂来降解溴酚蓝（BPB）溶液。通过在不同时间和温度下对TiC进行热处理（TiC@AR），获得了锐钛矿相和金红石相的TiC和TiO的纳米结构，这除了提高表面活性外，还导致了从紫外光到可见光的能带隙减小。在TiC@AR通过木聚糖和聚乙烯醇聚合并得到TiC@AR/PX后，能带隙减小到红外范围（占太阳光的52%），同时表面活性增强。通过研究可见光下BPB溶液的分解来测试化合物的光催化活性。结果表明，TiC和TiC@AR在150分钟后分别能使BPB浓度降低35%和37%，而TiC@AR/PX的这一降低率为72%。考虑到有效参数，能带隙和表面层在光催化降解中起关键作用。
