Qiqi Ding
The Hong Kong University of Science and Technology, Hong Kong
Title: Complete degradation of ciprofloxacin over g-C3N4/iron oxide composite via heterogeneous fenton reaction
Biography
Qiqi Ding is a PhD candidate of Chemical and Biological Engineering of HKUST. She has gotten her bachelor degree from Pharmaceutical Engineering of Sichuan University and Master degree from Chemical and Biomolecular Engineering of HKUST. She worked as an assistant engineer at the Hong Kong Productivity Council from 2014 to 2015. And now, she is doing her PhD degree in HKUST and her research interest is to prepare nanomaterials for antibiotics degradation with heterogeneous Fenton-like reaction or semiconductor photocatalysis.
Abstract
The extensive utilization of antibiotic makes it continually flow into the environment which could induce many far-reaching hazards to the society. Ciprofloxacin (CIP), one of the most commonly used broad-spectrum fluoroquinolone antibiotics, has been detected from the effluent of wastewater treatment plants (WWTPs), indicating that conventional wastewater treatment method is not suitable for CIP removal. Therefore, it is significant to develop new techniques to degrade CIP effectively. In this work, g-C3N4/iron oxide composites (CN@IO composites) were first fabricated with a facile one-pot method to synthesis g-C3N4 in situ onto iron oxide. The obtained composites were acted as non-toxic and high-efficient catalysts in Fenton system for CIP degradation. With the proper ratio between iron oxide and the precursor of g-C3N4, the as-prepared CN@IO-2 could achieve completely CIP degradation and 48.5% of mineralization within 2h. In addition, the operation conditions for CIP degradation were also studied by altering the pH value, dosage of the catalyst, initial CIP and H2O2 concentration. Compared with sole g-C3N4 and iron oxide, the enhanced performance on CIP degradation is attributed to the synergic effect of g-C3N4 and iron oxide. This work provides a new thought to develop environmentally friendly and more highly efficient heterogeneous fenton catalysts for refractory organic pollutants degradation.
Prinjaporn Teengam
Chulalongkorn University, Thailand
Title: A smartphone-based electrochemical immunosensor for hepatitis B virus detection
Biography
Prinjaporn Teengam is a postdoctoral researcher at Department of Chemistry, Faculty of Science, Chulalongkorn University. Her project interests are in the areas of Analytical Chemistry, Nanotechnology and Materials Chemistry. The existing research focuses on the development of DNA biosensors for biologically relevant analytes (e.g. bacteria, viruses, and disease biomarkers).
Abstract
A label-free electrochemical immunosensor for the determination of hepatitis B virus (HBV) based on poly-β-cyclodextrin (Pβ-CD)/gold nanoparticles (AuNPs) modified electrode was developed. Pβ-CD provided the ability to capture the anti-HBV by host-guest interaction. In the presence of HBV, the specific interaction between HBV and anti-HBV brought HBV to the electrode, which leads to a lower accessibility of [Fe(CN)6]3−/4− redox molecules to reach the electrode surface. The electrochemical signal of [Fe(CN)6]3-/4- before and after binding with HBV could be clearly distinguished. The electrochemical detection of the proposed system was demonstrated using the smartphone-based point-of-care testing (POCT) platform. The proposed concept was successfully applied with the clinical sample. Moreover, this simple-to-fabricate label-free electrochemical immunosensor using a smartphone-based measurement system has the potential to be developed as an alternative diagnostic device for simple, low-cost, sensitive and selective HBV detection.
