Preparation Of Phosphorescent Molecularly Imprinted Materials And Detection Of Water Environmental Pollutants

Water environmental pollution is one of the global ecological problems.The monitoring of water environmental pollutants has become an important means of environmental assessment and environmental governance.Therefore,technology development related to environmental detection has become a research hotspot.As a semiconductor nanocrystal with unique optical and functional properties,quantum dots?QDs?are popular in the field of analytical detection.Room-temperature phosphorescence?RTP?quantum dots can overcome the interference of background fluorescence and scattered light.Molecular imprinting technology?MIT?has high selectivity to the target and avoids interference from coexisting substances.In this study,two phosphorescent molecularly imprinted polymers were prepared by using to detect template molecules malachite green?MG?and 4-nitrophenol?4-NP?.Characterize its morphology,composition and luminescence properties,and focus on its specific recognition performance and mechanism for target pollutants.The main contents of this study are as follows:?1?Fusion of Mn-doped ZnS quantum dots?Mn-ZnS QDs?and MIT,phosphorescence resonance energy transfer?PRET?can occur between molecularly imprinted polymers?MIP-coated QDs,MIPs?prepared by reverse microemulsion method and target small molecule MG,RTP intensity decreases with increasing MG concentration.The detection limits and detection ranges of MG were 30.34 nM and 0.08-80?M,respectively.The recoveries of MG in fish muscle and natural water were 96%-107%and 95%-102%,respectively.The MIPs combine RTP characteristics with MIT's high selectivity to avoid background or scattered light and interference from many competing substances in biological or environmental samples.It has been successfully used for the specific trace detection of MG in fish muscles or natural water.?2?Mesoporous imprinting technique combined with Mn-ZnS QDs to synthesize RTP-type mesoporous imprinted polymers?SiO₂@QD@ms-MIPs,MIPs?.Its photoinduced electron transfer?PIET?with the target small molecule 4-NP causes the RTP intensity to decrease with increasing 4-NP concentration.The detection limits and linear detection ranges for 4-NP were 59.57 nM and 0.1-100?M,respectively.The recovery rate of water-based environmental samples was 96-108%.The MIPs combine RTP characteristics with MIT's high selectivity to avoid interference from competing materials and background or scattered light in complex environmental samples.The probe is suitable for the specific trace detection of4-NP in water and soil.In conclusion,this study combined the RTP characteristics of Mn-ZnS QDs with the high selectivity of MIT by reverse microemulsion method and mesoporous surface molecular imprinting method to prepare two MIPs with different morphologies and functions.Selective recognition of MG and 4-NP in complex environmental matrices.The effective integration of the two provides a new way of thinking for functionalized molecularly imprinted materials,photoluminescence,environmental analysis,etc.,and broadens the development path of RTP sensors and MIT.