He Peipei, Mao Tianyu, Wang Anming, Yin Youcheng, Shen Jinying, Chen Haoming, Zhang Pengfei
College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University Hangzhou 310014 P. R. China
Holistic Integrative Pharmacy Institutes, College of Medicine, Hangzhou Normal University Hangzhou Zhejiang China.
RSC Adv. 2020 Jul 10;10(44):26067-26077. doi: 10.1039/d0ra03783d. eCollection 2020 Jul 9.
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 reached 139.48 mg g (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 H. The results show that waste microorganisms can efficiently adsorb and remove waste Pd(ii) and produce Bio-Pd nanoparticle catalysts in the presence of H. 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".
为了以废治废并高效去除有机污染物，将废钯（II）吸附并还原在微生物表面，以催化去除制药废水中的环丙沙星。通过优化pH值和温度等条件，在微生物上吸附并还原的生物钯量达到139.48 mg g（钯/微生物）。此外，通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）和能谱分析（EDXA）表征发现，大部分钯（II）被还原为纳米尺寸的钯（0）。使用所制备的生物钯，在25℃下环丙沙星的还原去除率高达87.70%，是未添加氢气时的3.03倍。结果表明，废弃微生物能够在氢气存在下有效吸附和去除废钯（II）并生成生物钯纳米颗粒催化剂。这种生物钯在环丙沙星的还原降解中表现出高催化活性和巨大优势。我们的方法还可应用于其他废金属离子以制备生物金属，促进其回收和再利用，用于降解废水中的有机污染物，从而实现“以废治废”。
