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 1 BiOBr/石墨烯(BiOBr/RGO)水凝胶材料制备流程
Figure 1. Schematic synthesis of BiOBr/graphene (BiOBr/RGO) hydrogel composite
CTAB—Cetyl trimethyl ammonium bromide; EG—Ethylene glycol; GO—Graphene oxide
图 2 氧化石墨烯(GO) (a)、RGO和BiOBr/RGO水凝胶复合材料(b)的XRD图谱
Figure 2. XRD patterns of graphene oxide (GO) (a), RGO and BiOBr/RGO hydrogel composites (b)
图 3 BiOBr、RGO和BiOBr/RGO水凝胶复合材料的FESEM图像
Figure 3. FESEM images of BiOBr, RGO and BiOBr/RGO hydrogel composite
图 4 RGO和BiOBr/RGO水凝胶复合材料的XPS图谱
Figure 4. XPS spectra of RGO and BiOBr/RGO hydrogel composite
图 5 BiOBr和BiOBr/RGO水凝胶复合材料的N2吸附-脱附热力学曲线(a)及孔径分布曲线(b)
Figure 5. N2 adsorption-desorption isotherms (a) and pore size distribution curves (b) of BiOBr and BiOBr/RGO hydrogel composite
图 6 BiOBr和BiOBr/RGO水凝胶复合材料的紫外-可见光漫反射图谱
Figure 6. UV-vis diffuse reflectance spectra of BiOBr and BiOBr/RGO hydrogel composite
图 7 BiOBr和BiOBr/RGO水凝胶复合材料在300 W氙灯下的光电流瞬态响应(a)和电化学阻抗图谱(b)
Figure 7. Transient photocurrent responses under 300 W xenon lamp (a) and electrochemical impedance spectra (b) of BiOBr and BiOBr/RGO hydrogel composite
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 10 BiOBr/RGO水凝胶复合材料在循环使用前和后的FTIR图谱
Figure 10. FTIR spectra of BiOBr/RGO hydrogel composite before use and after recycled
图 11 BiOBr/RGO水凝胶复合材料过滤后循环使用的残余率(a)及在300 W氙灯下的循环利用性能(b)
Figure 11. Remaining rate by cycle runs after filtration (a) and recyclability under 300 W xenon lamp (b) of BiOBr/RGO hydrogel composite
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
图 13 BiOBr/RGO水凝胶复合材料的光降解机制
Figure 13. Photodegradation mechanism diagram of BiOBr/RGO hydrogel composite
VB—Valence band; CB—Conduction band
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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