Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 440, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129789
Keywords
Acid optimization; Ammonia elimination; Ester plastics; Odor treatment; Plastic recycling
Categories
Funding
- National Natural Science Foundation of China [52100132]
- Research and Development Program of Zhejiang Province [2022C03073]
- Key Research Program of Zhejiang Province [2021C03165]
- Natural Sciences Foundation of Zhejiang Province [LZ20D050002]
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This study presents a novel low-cost and efficient method to recycle waste plastics as NH3 adsorbents by regulating the structure and adsorption sites of ethylene glycol dime-thacrylate (EGDMA) polymers.
Activated carbon and metal organic frameworks have been tested as NH3 recovery adsorbents, however, they are limited due to low NH3 adsorption capacity and high cost, respectively. In this study, ethylene glycol dime-thacrylate (EGDMA) polymers as the representative ester plastics were tested, and their structure and adsorption sites were regulated using HNO3, HCl, or H2SO4 with varied H+ concentrations. The results showed that the EGDMA polymers all used hydrolysis which promoted NH3 adsorption via different mechanisms. With HNO3 and HCl optimization, an increased surface area promoted NH3 adsorption via physical forces. H2SO4 optimization resulted in -COOH, -OH, and -SO3H formation, which reacted with NH3 by chemical adsorption and hydrogen bonds. This significantly increased the NH3 adsorption capacity (85.99 mg.g(-1)) compared to the material before optimization (0.36 mg.g(-1)). This study presents a novel low-cost and efficient method to recycle waste plastics as NH3 adsorbents.
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