Synthesis of Novel High-Performance Adsorbent Based on Modified Polyurethane/Polysaccharidesfor Wastewater Treatment

This study involved the synthesis of a novel composite gel consisting of chitosan modified diatomite (DE/CS), sodium alginate (SA), and polyethyleneimine (PEI) (DE/CS-PEI@SA) using the ion crosslinking method. The micro characteristics of the composite gels were examined through scanning electron microscopy, X-ray diffraction, differential scanning calorimetry/thermal gravimetric analysis, and Brunauer-Emmett-Teller systems. Their adsorption properties and mechanisms towards copper Cu(II) and lead Pb(II) ions were investigated using infrared, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and Zeta potential analyses. The DE/CS-PEI@SA composite gels exhibit numerous uniform folds on its surface, boasting a specific surface area of 18.96 m2/g and a pore size ranging from 1.5 to 80.0 nm, demonstrating robust thermal stability pre- and post- adsorption. Notably, these composite gels demonstrate impressive adsorption capacities for Cu(II) (174.39 mg/g) and Pb(II) (295.04 mg/g), respectively. The integration of DE/CS and PEI within the composite gel contributes to a complex pore structure and a multitude of accessible. The adsorption behavior of the composite gel is accurately characterized by the pseudo-second-order kinetic model and Langmuir model. The predominant adsorption mechanism involves single-molecule chemisorption, involving coordination adsorption, ion exchange, and electrostatic attraction. The composite gel demonstrates notable efficiency in adsorption, cost-effectiveness, and ease of separation, rendering it a viable option for wastewater treatment applications.

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Differential Effects of Various Cleaning Solutions on the Cleaning and Regeneration Performance of Commonly Used Polyester Fiber Material Air Filters

He,

Zhang,

et al. 2024

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The regeneration and performance of air filter materials are important means of conserving energy and reducing emissions in civil public buildings. The repeated regeneration and use of air filters can not only effectively increase the lifespan of the filters but also reduce the phenomenon of filter disposal and incineration after reaching or not reaching the replacement cycle, further reducing resource waste and air pollution and thereby directly or indirectly reducing carbon emissions. In this study, polyester fiber air filters commonly used in civil public buildings were selected as the research object, and the regeneration performance and structural parameters of water and a cleaning solution were investigated under various cleaning conditions. The results show that the filtration efficiency when cleaning with water was higher than that when cleaning with the cleaning solution. The filtration efficiency for PM10, PM2.5, and PM1.0 increased from 0.3% to 3.5%, 0.7% to 6.3%, and 0.1% to 4.6%, respectively. Water could be used twice for cleaning for PM10 and once for PM2.5, and the cleaning solution could only be used once for cleaning for PM10. The counting filtration efficiency of 0.3 to 2.5 μm particulates showed a relatively significant change. The resistance after cleaning with water was higher than that after cleaning with the cleaning solution. For the quality factor (QF) value of PM10, the cleaning solution had a slightly higher cleaning effect, while for the QF values of PM2.5 and PM1.0, water had a slightly higher cleaning effect. In practical use, it is recommended to first use a cleaning solution and then water for subsequent cleaning. This study provides data support for the use of filters to achieve the dual carbon goal.

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Synthesis of Novel High-Performance Adsorbent Based on Modified Polyurethane/Polysaccharidesfor Wastewater Treatment

Cited by 3 publications

References 42 publications

Chitosan Modified Diatomite Cross-Linked with Sodium Alginate and Polyethyleneimine Composite Gel Particles for Efficient Removal of Copper and Lead Ions

Chitosan Modified Diatomite Cross-Linked with Sodium Alginate and Polyethyleneimine Composite Gel Particles for Efficient Removal of Copper and Lead Ions

Chitosan modified diatomite cross-linked with sodium alginate and polyethyleneimine composite gel particles for efficient removal of copper and lead ions

Differential Effects of Various Cleaning Solutions on the Cleaning and Regeneration Performance of Commonly Used Polyester Fiber Material Air Filters

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