| 层状锌铝双金属氧化物的制备及其吸附-光催化性能 | |
| Preparation and adsorption-photocatalytic performance of ZnAl@layered double oxides | |
| 摘要: 采用前驱体煅烧法制备具有吸附-光催化双功能的层状锌铝双金属氧化物(LDOs)。通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外可见漫反射光谱(UV-Vis DRS)、扫描电子显微镜(SEM)等表征探究了双金属比例、煅烧温度对其吸附-光催化降解四环素(TC)性能的影响。结果表明，当Zn、Al物质的量之比为2∶1，煅烧温度为400 ℃时，可形成具有优异吸附-光催化活性的 Zn2Al1@LDO400。吸附实验表明，Zn2Al1@LDO400对 TC是化学吸附限制的非均相单分子层吸附，且高温利于吸附。利用自由基猝灭实验结合电子顺磁共振(EPR)测试证实光生空穴(h+)、羟基自由基(·OH)、超氧自由基(·O2-)作为活性物种参与TC的协同降解。 | |
| 关键词: 双金属氧化物 四环素 吸附-光催化 协同降解 | |
| 基金项目: 国家自然科学基金(No.52160020)和江西省重点研发计划项目“揭榜挂帅”(No.JXNK202306-04)资助。 | |
| Abstract: The precursor-calcination approach was employed to fabricate ZnAl@layered double oxides (LDOs) with dual functionality with adsorption and photocatalysis. The effect of bimetallic ratios and calcination temperatures on the adsorption-photocatalytic degradation of tetracycline (TC) was systematically investigated by X-ray powder diffraction (XRD), infrared spectroscopy (FTIR), ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS), and scanning electron microscope (SEM). The results indicated that a molar ratio of 2∶1 for Zn to Al and a calcination temperature of 400 ℃ resulted in Zn2Al1@LDO400 with outstanding adsorption-photocatalytic activity. Moreover, adsorption studies revealed that Zn2Al1@LDO400 displayed the chemisorption-limited heterogeneous monolayer adsorption for TC, with higher temperatures promoting the adsorption process. Simultaneously, the collaborative degradation of TC by photogenerated holes (h+), hydroxyl radicals (·OH), and superoxide radicals (·O2-) was confirmed through free radical quenching experiments and electron paramagnetic resonance (EPR) tests. | |
| Keywords: layered double oxide tetracycline adsorption-photocatalytic collaborative degradation | |
| 投稿时间：2024-01-11 修订日期：2024-07-22 | |
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| 章萍,赵晨晨,崔潇匀,谢冰,刘依涵,林海玉,张佳乐,谌宇楠.层状锌铝双金属氧化物的制备及其吸附-光催化性能[J].无机化学学报,2024,40(10):1965-1974. | |
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