Zhang Yaping, Cao Peiyu, Zhu Xinhua, Li Bozhen, He Yufeng, Song Pengfei, Wang Rongmin
Key Lab. Eco-functional Polymer Materials of MOE, Institute of Polymer, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
Key Lab. Eco-functional Polymer Materials of MOE, Institute of Polymer, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China.
J Environ Manage. 2021 Dec 1;299:113636. doi: 10.1016/j.jenvman.2021.113636. Epub 2021 Aug 28.
BiOBr is a kind of promising photocatalyst because of excellent photoelectric separation efficiency and chemical stability. In order to improving practical application performance, a novel BiOBr ultra-thin nano-roundel (BiOBr-nR) was constructed in water-in-oil (WIO) emulsion microspheres, and prepared by hydrothermal reaction. Its specific surface area was increased by changing microtopography and downsizing. After being characterized by FT-IR, X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), UV-Vis diffuse reflectance spectra (UV-Vis DRS) and photoluminescence (PL), it indicated the BiOBr-nR, being doped by C and N, is 4-5 times smaller and thinner than that of conventional BiOBr. It was also found that BiOBr-nR has narrower band gap energy (2.78 eV), excellent photocatalytic activity, significant reusability, and stability. The obtained BiOBr-nR photocatalysts were applied to remove organics. It presented excellent photocatalytic activity, the degradation rate of organics got to 99.2%. The mechanism of photodegradation was investigated, which indicated superoxide radicals and holes play a major role in the degradation of organics. Therefore, BiOBr-nR is a kind of environmentally friendly photocatalyst with stable photocatalytic activity, the removal rate still more than 97% after recycling for 10 times. In summary, we found a novel insight for designing and preparation of efficient and recyclable BiOBr photocatalytic materials, which exhibits high photoresponse for purifying the wastewater.
溴氧化铋（BiOBr）是一种很有前景的光催化剂，因其具有优异的光电分离效率和化学稳定性。为了提高其实际应用性能，在油包水（WIO）乳液微球中构建了一种新型的溴氧化铋超薄纳米圆盘（BiOBr-nR），并通过水热反应制备而成。通过改变微观形貌和减小尺寸，其比表面积得以增加。经傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、粉末X射线衍射（XRD）、扫描电子显微镜（SEM）、布鲁诺尔-埃米特-泰勒（BET）、紫外-可见漫反射光谱（UV-Vis DRS）和光致发光（PL）表征后发现，掺杂了碳和氮的BiOBr-nR比传统的BiOBr小4至5倍且更薄。还发现BiOBr-nR具有更窄的带隙能量（2.78电子伏特）、优异的光催化活性、显著的可重复使用性和稳定性。所制备的BiOBr-nR光催化剂被用于去除有机物。它表现出优异的光催化活性，有机物降解率达到99.2%。对光降解机理进行了研究，结果表明超氧自由基和空穴在有机物降解中起主要作用。因此，BiOBr-nR是一种具有稳定光催化活性的环保型光催化剂，循环使用10次后去除率仍超过97%。综上所述，我们为高效且可回收的BiOBr光催化材料的设计和制备找到了一种新的思路，该材料在净化废水方面表现出高光响应性。
