Abstract
The present study demonstrated a freeze-drying-carbonization method to synthesize silver nanoparticle-modified bamboo-based carbon aerogels to remove formaldehyde. The bamboo-based carbon aerogel (BCA) has the advantages of controllable pore size and rich oxygen-containing groups, which can provide a good foundation for surface modification. BCA can greatly enhance the purification of formaldehyde by loading silver nanoparticles. The maximum adsorption capacity of 5% Ag/BCA for formaldehyde reached 42 mg/g under 25 ppm formaldehyde concentration, which is 5.25 times more than that of BCA. The relevant data were fitted by the Langmuir model and the pseudo 2nd-order model and good results were obtained, indicating that chemical absorption occurred between the carbonyl of formaldehyde and the hydroxyl of BCA. Therefore, silver nanoparticle-modified bamboo-based carbon aerogels play a positive role in the selective removal of formaldehyde. Silver nanoparticles promoted the activation of oxygen and strengthened the effect of BCA on HCHO adsorption.
Highlights
Formaldehyde (HCHO) is a colorless, pungent, and irritating gas
Silver nanoparticles promoted the activation of oxygen and strengthened the effect of BCA on Bamboo-Based Carbon Aerogels for Keywords: silver nanoparticle; bamboo-based carbon aerogel; adsorption; formaldehyde
The silver nanoparticle aerogel precursors were synthesized by a simple one-pot method and freeze-dried using bamboo cellulose as the raw material; the silver nanoparticle carbon aerogel was obtained after carbonization
Summary
Formaldehyde (HCHO) is a colorless, pungent, and irritating gas. It is a highly active aldehyde and an important chemical raw material, and so many industrial products cannot be produced without it. Indoor HCHO is mainly produced by wood products, thermal insulation materials, paint, varnish, household cleaning products and cigarettes, etc. Formaldehyde is toxic and one of the main harmful volatile gases. It is identified as a carcinogenic and teratogenic substance [3,4]. It was reported that animals developed headaches, dizziness, nausea, and even vomiting when exposed to a low concentration of formaldehyde for a long time [5,6]. There are many kinds of purification methods; according to the purification principle, these mainly include: plant purification [8,9,10], adsorption [11,12], photocatalysis [13,14,15], and so on
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