采用简单的一步水热法将红磷和水热碳复合,得到新型红磷/水热碳复合材料,通过X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜、紫外-可见漫反射光谱仪、电化学工作站对复合材料的结构、微观形貌、吸光特性及电化学性能进行表征和测试,以盐酸四环素(TCH)为目标污染物,研究复合材料的光催化性能、探究其光催化机理并验证其重复利用性。结果表明:与单一的红磷和水热碳相比,红磷/水热碳复合材料具有更高的光催化性能;可见光照射4h后,红磷/水热碳复合材料对水中TCH的降解率可达90.5%,明显高于红磷和水热碳。超氧自由基(·O-2)和羟基自由基(·OH)是降解TCH过程中的主要活性物种。此外,红磷/水热碳复合材料在重复利用中表现出较好的循环使用性,循环5次后降解率下降3.8%,对TCH的降解率仍可达86%以上。
A simple one-step hydrothermal method was used to compound red phosphorus and hydrothermal carbon to form a new type of red phosphorus/hydrothermal carbon composite.The structure,microscopic morphology,light-absorbing properties and electrochemical properties of the composite were characterized by X-ray diffraction patterns (XRD),Fourier transform infrared absorption spectroscopy (FT-IR),scanning electron microscopy (SEM),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS),and electrochemical workstation.The photocatalytic performance of the novel composites was studied using tetracycline hydrochloride (TCH) as the target pollutant,and the photocatalytic mechanism was explored and the reusability was verified.The results showed that the red phosphorus/hydrothermal carbon composites had better photocatalytic performance than single red phosphorus and single hydrothermal carbon.The TCH degradation rate in water by red phosphorus/hydrothermal carbon was 90.5% after 4h of visible light irradiation,which was greatly higher than that of single red phosphorus and single hydrothermal carbon.Superoxide radicals (·O-2) and hydroxyl radicals (·OH) were the main active species in the degradation of TCH.Moreover,the red phosphorus/hydrothermal carbon composites exhibited good recyclability in the reuse experiment.After five cycles,the degradation efficiency of TCH decreased by 3.8% and could still reach more than 86%.
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基金资助
中国长江电力股份有限公司资助项目(4222020011);国家自然科学基金(52100005);中央高校基本科研业务费专项资金资助(B230201003)
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