Enhanced reductive removal of ciprofloxacin in pharmaceutical wastewater using biogenic palladium nanoparticles by bubbling H2

Peipei He; Tianyu Mao; Anming Wang; Youcheng Yin; Jinying Shen; Haoming Chen; Pengfei Zhang

doi:10.1039/d0ra03783d

Enhanced reductive removal of ciprofloxacin in pharmaceutical wastewater using biogenic palladium nanoparticles by bubbling H₂

RSC Adv. 2020 Jul 10;10(44):26067-26077. doi: 10.1039/d0ra03783d. eCollection 2020 Jul 9.

Authors

Peipei He¹, Tianyu Mao¹, Anming Wang¹, Youcheng Yin², Jinying Shen¹, Haoming Chen¹, Pengfei Zhang¹

Affiliations

¹ College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University Hangzhou 310014 P. R. China waming@hznu.edu.cn.
² Holistic Integrative Pharmacy Institutes, College of Medicine, Hangzhou Normal University Hangzhou Zhejiang China.

Abstract

To treat waste with waste and efficiently remove the organic pollutant, waste palladiums(ii) were adsorbed and reduced on microorganism surface to catalyze the reductive removal of ciprofloxacin in pharmaceutical wastewater. By optimizing conditions such as pH and temperature, the amount of biogenic palladium adsorbed and reduced on E. coli reached 139.48 mg g^-1 (Pd/microorganisms). Moreover, most of the Pd(ii) was reduced to nanometer-sized Pd(0) as characterized by TEM and SEM with EDXA. Using the obtained biogenic palladium, the reductive removal of ciprofloxacin is up to 87.70% at 25 °C, 3.03 folds of that achieved in the absence of H₂. The results show that waste E. coli microorganisms can efficiently adsorb and remove waste Pd(ii) and produce Bio-Pd nanoparticle catalysts in the presence of H₂. This biogenic palladium presents high catalytic activity and great advantages in the reductive degradation of ciprofloxacin. Our method can also be applied to other waste metal ions to prepare the biogenic metals, facilitate their recovery and reuse in degrading organic pollutants in wastewater to achieve "treating waste using waste".