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铁酸钴基复合催化剂的制备及其活化PMS降解刚果红性能
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Abstract:
铁氧体作为活化过硫酸盐的催化剂能够表现优异的催化性能，但由于其本身高表面能，铁氧体粒子容易团聚，使得催化性能下降。本研究采用铁酸钴与聚苯胺(PANI)复合，制备了一种复合催化剂CoFe2O4@PANI (CFP)来活化过硫酸盐(PMS)降解刚果红(CR)。系统表征显示，CoFe2O4纳米颗粒均匀沉积在PANI长链纤维上；CFP具有43.52 emu·g？1的强磁性，可实现高效磁分离。催化降解实验表明，CFP/PMS系统对CR的去除率远高于CoFe2O4/PANI/PMS系统。在[CR] = 50 mg/L、[PMS] = 1 mM、0.2 g/L CFP、起始pH = 7和T = 25？C条件下，最大降解效率达到99.2%。活性氧(ROS)淬灭实验表明，1O2、
和
主要参与了CR的消除。共存阴离子实验表明，
、
和Cl？对CR降解无明显影响，
对催化过程有轻微影响，说明该催化剂的环境适应能力较强。
Ferrite can exhibit excellent catalytic performance as a catalyst for activation of persulfate, but due to its own high surface energy, ferrite particles are prone to agglomeration, which makes the catalytic performance decrease. In this study, a composite catalyst CoFe2O4@PANI (CFP) was prepared to activate persulfate (PMS) for degradation of Congo red (CR) using cobalt ferrite complexed with polyaniline (PANI). Systematic characterisation showed that CoFe2O4 nanoparticles were uniformly deposited on the long-chain fibres of PANI; CFP possessed a strong magnetic property of 43.52 emu·g？1, which enabled efficient magnetic separation. The catalytic degradation experiments showed that the removal of CR by the CFP/PMS system was much higher than that by the CoFe2O4/PANI/PMS system. The maximum
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