Preparation of recyclable BiOBr/graphene hydrogel composite and its photodegradation of sodium butyl xanthate
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摘要: 本文利用水热法合成BiOBr/石墨烯(BiOBr/RGO)水凝胶复合材料,采用XRD、SEM等手段表征复合材料的组成、形貌特征,并探究了BiOBr/RGO水凝胶复合材料对正丁基钠黄药的降解性能。结果表明,成功制备出有利于回收利用的三维宏观BiOBr/RGO水凝胶复合材料;50 mL浓度为25 mg/L的正丁基钠黄药溶液,降解时间为85 min时,10 mg BiOBr/RGO水凝胶复合材料(BiOBr质量分数为92wt%)对黄药的降解率可达96.69%,而纯BiOBr降解率仅为44.84%。总之,RGO的引入可以提升BiOBr的光催化性能,且宏观材料有利于回收再利用。Abstract: The BiOBr/graphene (BiOBr/RGO) hydrogel composites were prepared via hydrothermal method in this study. The composition and morphology of materials were characterized by XRD and SEM. Photocatalytic properties of the BiOBr/RGO hydrogel composites on sodium n-butyl xanthate were systematically investigated, respectively. The results show that three dimensional macroscopical BiOBr/RGO hydrogel composites are successfully prepared, which is beneficial to recycling. When initial concentration of 50 mL sodium n-butyl xanthate is 25 mg·L−1, degradation time is 85 min, and the dosage of photocatalyst is 10 mg. The degradation efficiency of the BiOBr/RGO hydrogel composite (mass fraction of BiOBr is 92wt%) for sodium n-butyl xanthate can reach 96.69%, and that of BiOBr is merely 44.84%. In all, the introduction of RGO can improve the photocatalytic performance of BiOBr, and macro material is favorable for recycling.
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Key words:
- BiOBr /
- graphene hydrogel composite /
- photocatalysis /
- sodium butyl xanthate /
- recyclable
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图 8 BiOBr和BiOBr/RGO水凝胶复合材料对正丁基钠黄药(SBX)的吸附性能对比(SBX溶液体积为50 mL,10 mg样品)
Figure 8. Comparison of adsorption properties of BiOBr and BiOBr/RGO hydrogel composites for sodium n-butyl xanthate (SBX) (Volume of SBX is 50 mL, the dosages of all samples is 10 mg
C0—Initial concentration of SBX solution (25 mg/L)
图 9 BiOBr和BiOBr/RGO水凝胶复合材料在300 W氙灯下对SBX光降解性能(a)及光降解动力学(b)(C0为 25 mg/L,SBX体积为50 mL,10 mg样品)
Figure 9. Photocatalytic activities under 300 W xenon lamp (a) and kinetic curves of photocatalytic degradation (b) for SBX of BiOBr and BiOBr/RGO hydrogel composites (C0 is 25 mg/L, volume of SBX is 50 mL, the dosage of all samples is 10 mg)
k—First-order kinetics constant
图 12 在300 W氙灯下不同捕获剂对BiOBr/RGO水凝胶复合材料光催化性能的影响(C0为 25 mg/L,SBX体积为50 mL,10 mg样品)
Figure 12. Effect of photodegradation on BiOBr/RGO hydrogel composite in presence of different scavengers under 300 W xenon lamp irradiation (C0 is 25 mg/L, volume of SBX is 50 mL, the dosage of all samples is 10 mg)
EDTA-2Na—Ethylenediaminetetraacetic acid disodium salt
表 1 BiOBr/RGO水凝胶复合材料的名称及含量
Table 1. Name and content of BiOBr/RGO hydrogel composites
Composite name Mass fraction of BiOBr/wt% Mass fraction of RGO/wt% 98wt%BiOBr/RGO 98 2 95wt%BiOBr/RGO 95 5 92wt%BiOBr/RGO 92 8 90wt%BiOBr/RGO 90 10 -
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