Synthesis and modification of hydro(solvo) thermal-supported silica aerogels and their use in adsorption studies

Öz

The hydro(solvo)thermal synthesis method was used to successfully synthesize bare silica aerogels and nano- and microparticle-embedded silica aerogels containing SiO2 and carbon microparticles in this study. New groups were added to these structures through modification. In the study, first, the effect of the variables was systematically examined to determine the optimum conditions. The most suitable recipe for silica aerogel was created. SiO2 and CP particles were synthesized, and modified silica aerogels were prepared with these particles and agents containing amine. For the characterization of synthesized silica aerogel, particles (SiO2, CP) and particle-embedded silica aerogels, TGA, SEM, DLS and BET-BJH techniques were used. These structures were used as adsorbent in environmental applications such as removing organic pollutants like 4-nitro phenol, methylene blue, Victoria blue, bromophenol blue etc. from aqueous media. In this environmental application, the adsorption capacity (mg/g) was determined by using UV-vis spectroscopy. The prepared structures are good adsorbents, and the adsorption capacity can be increased 18-fold with modification.

Anahtar Kelimeler

• Hydro(solvo)thermal synthesis
• Silica aerogel
• CP/SiO2- silica aerogel
• Adsorption

Hidro(solvo)termal destekli silika aerojellerin sentezi, modifikasyonu ve onların adsorpsiyon çalışmalarında kullanımı

Öz

Hidro(solvo)termal sentez yöntemi, bu çalışmada SiO2 ve karbon mikropartikülleri gibi nano- ve mikropartikül katkılı silika aerojelleri ile boş silika aerojellerini başarılı bir şekilde sentezlemek için kullanılmıştır. Hazırlanan bu yapılara modifikasyon yoluyla yeni gruplar eklenmiştir. Çalışmada öncelikle optimum koşulların belirlenmesi için değişkenlerin etkisi sistematik olarak incelenmiştir. Silika aerojel için en uygun reçete oluşturulmuştur. SiO2, CP partikülleri sentezlenmiş ve bu partiküller ile ve amin içeren ajanlar ile modifiye silika aerojeller hazırlanmıştır. Sentezlenen silika aerojel, partiküller (SiO2, CP) ve partiküller gömülü silika aerojellerin karakterizasyonu için; TGA, SEM, DLS ve BET-BJH teknikleri kullanıldı. Hazırlanan bu yapılar 4-nitro fenol, metilen mavisi, victoria mavisi, bromofenol mavisi vb. organik kirleticilerin sulu ortamdan uzaklaştırılması gibi çevresel uygulamada adsorban olarak kullanılmıştır. Bu çevresel uygulamada adsorpsiyon kapasitesi (mg/g) UV-vis spektroskopisi ile belirlenmiştir. Hazırlanan yapıların iyi bir adsorban olduğu ve modifikasyon ile adsorpsiyon kapasitesinin 18 kat arttırılabileceği ortaya konulmuştur.

Anahtar Kelimeler

• Hidro(solvo)termal sentez
• Silika aerojel
• CP/SiO2-silika aerojel
• Adsorpsiyon

Kaynakça

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