磁性生物炭基Bi_(2)WO_(6)光催化去除水中四环素和Cr(Ⅵ)的性能与机制

Performance and mechanism of magnetic biochar-based Bi_(2)WO_(6) photocatalytic removal of tetracycline and Cr(Ⅵ)from water

为实现水环境中抗生素和重金属的高效去除,采用水热法构筑了一种集高效吸附性、可见光催化性以及磁回收性于一体的磁性生物炭基钨酸铋光催化剂(BC@ZFO/BWO)。实验结果表明,磁性生物炭(BC@ZFO)掺杂量的质量分数为25%时,BC@ZFO/BWO的吸附性能和光催化活性最佳,在120 min内,对20.00 mg/L四环素(TC)吸附率为58.38%;在光反应60 min内,对20.00 mg/L TC和Cr(Ⅵ)去除率分别为95.36%和98.04%。ESR测试结果表明,在光催化反应过程中·O_(2)^(-)和·OH发挥了主要作用。重复利用实验表明,质量分数为25%的(BC@ZFO)/BWO具有良好的稳定性与磁回收性。可见,相比于传统的钨酸铋光催化剂,BC@ZFO/BWO光催化复合材料的构建,提升了光催化剂对水中有机污染物和重金属的氧化还原能力,为水污染修复和粉末催化剂的回收提供了新思路。

To achieve efficient removal of antibiotics and heavy metals in aquatic environments,a magnetic biochar-based bismuth tungstate photocatalyst(BC@ZFO/BWO)integrating efficient adsorption,visible-light photocatalytic activity,and magnetic recyclability has been prepared by using a hydrothermal method in this study.The experimental results showed that when the mass fraction of magnetic biochar(BC@ZFO)doping was 25%,the adsorption performance and photocatalytic activity of BC@ZFO/BWO were optimal.Within 120 minutes,the adsorption rate of 20.00 mg/L tetracycline(TC)was 58.38%.Within 60 minutes of light reaction,the removal rates of 20.00 mg/L TC and Cr(Ⅵ)were 95.36%and 98.04%,respectively.ESR test results indicated that ·O_(2)^(-) and ·OH played a dominant role in the photocatalytic degradation process.Repeated usage experiments demonstrated that 25%mass fraction(BC@ZFO)/BWO possessed good stability and magnetic recyclability.It can be seen that compared with the traditional bismuth tungstate photocatalysts,the construction of BC@ZFO/BWO photocatalytic composite material enhanced the redox capability of photocatalysts for organic pollutants and heavy metals in water,providing new insights for water pollution remediation and the recovery of powder catalysts.