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3D spherical visible light catalyst ZIF-8/BiOI composites was prepared from Bi(NO3)3•5H2O, KI and self-made metal-organic framework material ZIF-8 by ethylene glycol solvothermal method, characterized by XRD, FTIR, SEM, EDS, BET and UV-Vis, and evaluated for its performance in activating peroxymonosulfate (PMS) oxidation to remove sodium 4-(2-hydroxy-1-naphthalenazo) benzenesulfonate (Orange Ⅱ) under light conditions. The effects of ZIF-8 addition amount (based on the mass of BiOI, the same below) and reaction conditions on the degradation rate of Orange Ⅱ were investigated, while the mechanism of Orange Ⅱ oxidative removal by activated PMS with ZIF-8/BiOI composites was speculated. The results showed that ZIF-8/BiOI composites exhibited good visible light response performance. Under the conditions of 500 mg/L ZIF-8/BiOI with 10% ZIF-8 as catalyst, 350 W xenon lamp simulated illumination, 0.5 mmol/L PMS, 100 mg/L Orange Ⅱ, adjust initial pH of solution 7.0, and 60 min, the degradation rate of Orange Ⅱ reached as high as 95.4%. The reaction process conformed to the first-order kinetic model. and
showed a significant effect while
, Cl−, and
displayed almost no influence on the reaction system. The 10%ZIF-8/BiOI also showed good reusability, with the degradation rate of Orange Ⅱ at 60 min still could reach 83.2% after 4 recycles. Hydroxyl radicals, singlet oxygen and holes were the main active substances in the degradation process, with sulfate radicals playing an auxiliary role. During the degradation process, the holes and electrons of BiOI and ZIF-8 were transferred to each other, enhancing the separation efficiency of photogenerated electron-hole pairs. With the synergistic coupling effect of type Ⅰ band structure heterojunctions and PMS, ZIF-8/BiOI accelerated the generation of free radicals in the degradation system.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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