改性叶绿素光催化剂的制备及光催化降解双酚A

SYNTHESIS OF MODIFIED CHLOROPHYLL PHOTOCATALYST AND PHOTODEGRADATION OF BISPHENOL A

以天然叶绿素为原料,研制了负载型改性叶绿素仿酶光催化剂,利用X-射线衍射仪、比表面积及孔径测试仪、透射电子显微镜、热重分析仪和振动样品磁强计对催化剂进行了表征;以双酚A为底物,考察了光催化剂吸收可见光催化降解水中酚类有机污染物的特性。结果表明,当双酚A初始浓度为4.38μmol/L、改性叶绿素仿酶光催化剂投加量0.15 g/L、溶液pH为6时,光催化反应360 min,双酚A降解率可达93.65%。在优化降解条件下,催化剂连续使用4次后,催化剂对双酚A的降解率仍达80.54%。同时研究了改性叶绿素仿酶光催化剂降解双酚A的机理。

Biomimetic catalyst loaded with modified chlorophyll were prepared utilizing natural chlorophyll as raw material, the products were characterized by X-ray diffraction （XRD）, Brtmauer-Emmett-Teller （BET）, transmission electron microscopy （TEM）, thermo gravimetric analyzer （TGA） and magnetometer （VSM）. bisphenol A （BPA） was used as model compound to evaluate the photodegradation performance of catalysts for phenols organic pollutants under simulated sunlight irradiation. The results indicated that the removal rate of BPA reached 93.65% within 360 min under the optimum conditions as follows： the initial BPA concentration is 4.38 μ mol/L and the catalyst dosage is 0.15 g/L at pH=6. The catalyst is reused for 4 times under the optimized condition and the degradation rate of BPA during the final round is 80.54%. Meanwhile, the mechanism on BPA degradation is also discussed in this paper.