Publications by authors named "Pengpai Miao"
The removal of pharmaceutical residues from water resources using bio-based materials is very important for human safety and health. Bio-based graphene oxide/chitosan (GO/CS) aerogel microspheres were fabricated with emulsification and cross-linking, followed by freeze drying, and were used for the adsorption of levofloxacin (LOF). The obtained GO/CS aerogel microspheres were characterized with scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), and thermogravimetry (TG).
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- The study focuses on creating molecularly imprinted polymers (MIPs) for the selective separation of L-tyrosine (L-Tyr) using electron beam irradiation instead of traditional thermal polymerization.
- Researchers prepared the MIPs using methacrylic acid and ethylene glycol dimethacrylate without an initiator, achieving a maximum adsorption capacity of 10.96 mg/g at an irradiation dosage of 340 kGy and 15 °C.
- The MIPs showed a high imprinting factor of 5.1 and selective coefficients of 3.9 and 3.5 when tested against similar compounds, demonstrating both effective synthesis and high selectivity for L-Tyr.
Due to the specific recognition performance, imprinted polymers have been widely investigated and applied in the field of separation and detection. Based on the introduction of the imprinting principles, the classification of imprinted polymers (bulk imprinting, surface imprinting, and epitope imprinting) are summarized according to their structure first. Secondly, the preparation methods of imprinted polymers are summarized in detail, including traditional thermal polymerization, novel radiation polymerization, and green polymerization.
View Article and Find Full Text PDFThe incorporation of graphene oxide (GO) into a polymeric drug carrier can not only enhance the loading efficiency but also reduce the initial burst and consequently improve the controllability of drug release. Firstly, 5-fluorouracil (5-Fu)-loaded hydroxypropyl cellulose/chitosan (HPC/CS@5-Fu) and GO/HPC/CS@5-Fu aerogels were successfully fabricated through chemical cross-linking with glutaraldehyde. Then, the obtained aerogels were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FITR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetry (TG), and the effect of HPC and GO content on the drug loading (DL) and encapsulation efficiency (EE) for the two aerogels were investigated, respectively.
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- This study focuses on developing a novel magnetic chelating resin for efficiently removing rare earth ion Ce(III) from wastewater using an irradiation-induced grafting method.
- The resin was made by suspending PMMA@FeO microspheres with glycidyl methacrylate (GMA) and aminating with polyethyleneimine (PEI), and it displayed strong structural and thermal stability.
- The findings showed that the resin has a high uptake capacity for Ce(III), and various factors influencing adsorption were analyzed, confirming that the process is spontaneous and endothermic, offering a new approach to eliminate rare earth pollutants.
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- - The research focuses on designing an effective bio-based dye adsorbent using millimeter-sized lignin/chitosan (Lig/CS) beads for removing Congo red (CR) dye through methods like electrostatic attraction and hydrogen bonding.
- - The optimal conditions for maximizing dye adsorption were found at a 20 wt% Lig/CS ratio, achieving a capacity of 173 mg/g and a removal rate of 86.5%.
- - The study also analyzed the adsorption mechanism and tested the adsorbent's recyclability, finding it followed a pseudo-second-order kinetic model and maintained over 90% dye removal efficiency after five cycles.
Hydraulic fracturing is an important technology for the exploitation of unconventional oil or gas reservoirs. In order to increase the production of oil or gas, ultra-lightweight proppants with a high compressive strength are highly desirable in hydraulic fracture systems. In this work, a new type of ultra-lightweight proppant, poly(styrene--methyl methacrylate)/fly ash (poly(St--MMA)/FA) composites with a high compressive strength were prepared via in situ suspension polymerization.
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