AI Article Synopsis
- Researchers developed a peroxymonosulfate oxidation system using modified β-cyclodextrin on Fe-doped ZIF-67, achieving high degradation rates of pollutants like carbamazepine (99.7%) and bisphenol A (91.3%) within short time frames.
- The study found that the effectiveness of pollutant removal was influenced by their hydrophobicity and that different reactive species such as SO and O played varying roles in degrading these compounds.
- A ceramic membrane reactor was used to immobilize the catalyst, resulting in nearly 100% pollutant removal efficiency under optimized conditions, showcasing the potential for improved treatments of pharmaceutical wastewater.
Article Abstract
A peroxymonosulfate oxidation system was developed via modification of β-cyclodextrin (β-CD) on the surface of Fe-doped ZIF-67 (CD/Fe@ZIF-67) as an activator. The 99.7% carbamazepine, 91.3% bisphenol A (BPA), and 95.4% diclofenac (DCF) degradation efficiency were achieved within 10 min, 60, and 1 min, respectively. The hydrophobicity of these three pollutants is positively correlated with their adsorption kinetic constants by CD/Fe@ZIF-67 due to the introduction of β-CD. Scavenger experiments and electron spin resonance spectra confirmed that carbamazepine was preferentially oxidized by SO [λ(SO)(70.5%) > λ(OH)(28.2%) > λ(O)(1.3%)], where SO and O played dominant roles in the degradation of BPA [λ(SO)(71.7%) > λ(O)(22.8%) > λ(OH)(5.5%)], and O was responsible for DCF removal [λ(O) = 93.2%]. Additionally, the particulate catalyst was immobilized in the shell side of a ceramic membrane in a membrane reactor for catalyst recovery. This reactor achieved nearly 100% removal efficiency under optimal conditions: 0.036 wt % catalyst loading, 0.5 mM peroxymonosulfate concentration, 1 L inflow, 10 mg/L initial carbamazepine concentration, and 0.012 L/min hydraulic retention time. In summary, this study elucidates the active role of β-CD in a polymetallic/peroxymonosulfate system and provides valuable insights into the development of effective oxidation methods for pharmaceutical and personal care products in wastewater.
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| http://dx.doi.org/10.1021/acsami.4c05315 | DOI Listing |
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