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Simple and sensitive molecularly imprinted polymer-MPA capped Mn-doped ZnS quantum dots-based phosphorescence probe for cyanotoxins determination in algae metabolites
摘要： This paper aimed to develop a simple method for detection and quantification of cylindrospermopsin (CYN) in the water sample. The novel biosensor was based on molecular imprinted Mn-doped ZnS quantum dots. Two fragments which mimicked the partial structure of CYN were carefully selected to synthesize the molecularly imprinted 3-mercaptopropionic acid-capped Mn-ZnS quantum dots (MPA-MnZnS-QDs-MIPs). As the two fragment imprinted sites could enhance the rebinding of CYN into them and modulated Mn-ZnS QDs’ selective aggregation in MPA-MnZnS-QDs-MIPs. Hence, the enhanced room temperature phosphorescence (RTP) response was observed as the MPA-MnZnS-QDs-MIPs interacted with CYN in the water sample. A good linear relationship with the concentration of CYN in the range of 30–320 μg L?1 with a detection limit of 24 μg L?1 was demonstrated by the enhanced phosphorescence intensity ratio ΔP/P0. And our detection method exhibited higher selectivity for CYN than the two partial fragments. Also, there was no interference on the detection system when the competitors were present in the algae culture samples. The method presented required minimal expertise and enabled fast and inexpensive monitoring of the water toxins.
关键词： Molecularly imprinted polymer,Cyanotoxins,Sensor,Quantum dots
更新于2025-09-16 10:30:52
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Effective Removal of Emerging Dissolved Cyanotoxins from Water using Hybrid Photocatalytic Composites
摘要： Harmful algal blooms are occurring more frequently in fresh water throughout the world. Certain cyanobacteria can produce and release potent toxic compounds, known as cyanotoxins, such as microcystins, cylindrospermopsin, saxitoxin, and anatoxin-a, and as such they have become a human and environmental health concern. Hybrid photocatalytic composites (HPCs) comprising carbon nanotubes on the surface of TiO2 nanotubes were designed in this study. The HPCs have a selective adsorption capacity to cyanotoxins and provide photocatalytic activity to produce reactive oxygen species for the degradation of cyanotoxins. HPCs with 5.2 mg carbon nanotubes/cm2 showed an excellent removal efficiency of microcystins-LR (> 95%) at 55.6 L/m2/hr/bar. The HPCs more efficiently removed the relatively larger and more hydrophobic cyanotoxins (i.e., microcystin-LR) than the relatively smaller and more hydrophilic compounds (such as cylindrospermopsin, saxitoxin, and anatoxin-a). With a further increased in the carbon nanotube content to 8.6 mg/cm2, the adsorption capacity of the HPCs for cyanotoxins increased to 70.6% for MC-LR. However, there was significant decrease in the photocatalytic activity of the HPCs for production of reactive oxygen species, and consequently a decrease in the degradation of cyanotoxins. It is considered that this device could be used to provide complete rejection of particles and pathogens, and also to significantly reduce trace organic compounds and harmful algal toxins in emergency water supplies.
关键词： Adsorption,Harmful algal blooms,Cyanotoxins,Photocatalytic activity,Reactive oxygen species,Hybrid photocatalytic composites
更新于2025-09-10 09:29:36