Synthesis of Mesoporous SiO2-supported Gold Nanoparticles from Gold Processing Wastewater

Year 2023, Volume: 8 Issue: 3, 421 - 427, 30.09.2023

Fatma Ulusal

https://doi.org/10.35229/jaes.1267476

Abstract

In this study, 1% by mass of gold in the last remaining waste solution due to purification of ramate gold by pyrometallurgical and hydrometallurgical techniques was attached to the mesoporous SiO2 and its surface as nanoparticles by entrapping it in a polyethylene glycol micelle. For this purpose, gold nanoparticles were prepared in mesoporous SiO2 from a waste solution containing Au3+ by using 35000 (PEG35000) compound of polyethylene glycol and tetra ethyl ortho silicate. It was determined by ICP-OES and FESEM analysis that the final product obtained contained 0.4% gold by mass. When the resulting nanomaterials were examined by SEM mapping analysis, it was observed that the gold nanoparticles were distributed very homogeneously in the mesoporous SiO2, and there was no aggregation. The TEM images show that there are two types of formations, regular hexagonal gold nanoparticles attached to the inside and surfaces of this structure and gold nanoparticles embedded in mesoporous SiO2, which is formed in a spherical form, as opposed to the smooth channels formed in the first formation. In both formations, it is seen that the sizes of gold nanoparticles are smaller than 10 nm. This study reveals a new product for obtaining gold nanoparticles by recovering the gold trapped in wastewater.

Keywords

gold recovery, cyanide, mesoporous SiO2, polyethylene glycol

Altın İşleme Atık Suyundan Mezogözenekli SiO2 destekli Altın Nanopartiküllerinin Sentezi

Abstract

Bu çalışmada, ramat altınının pirometalurjik ve hidrometalurjik teknikle saflaştırılması sonucu en son kalan atık çözeltisindeki kütlece %1 olan altın, polietilen glikol miseli içerisinde hapsedilmesi ile mezogözenekli SiO2 içine ve yüzeyine nanopartikül olarak tutturulmuştur. Bu amaçla polietilen glikolün 35000 (PEG35000) bileşiği ile tetra etil orto silikat kullanılarak Au3+ içeren atık çözeltiden mezogözenekli SiO2 içinde altın nanopartikülleri hazırlanmıştır. Elde edilen son üründe kütlece %0,4 altın içerdiği ICP-OES ve FESEM analizi ile belirlenmiştir. Oluşan nano malzemeler SEM haritalama analizi ile incelendiğinde altın nanopartiküllerinin mezogözenekli SiO2 içerisinde oldukça homojen bir şekilde dağıldığı ve topaklanma olmadığı görülmüştür. TEM görüntülerinden iki tip oluşum olduğu, ilk oluşumda düzenli bir şekilde oluşmuş düz kanallarına karşılık düzgün altıgen ve bu yapının içi ve yüzeylerine tutunmuş altın nanopartikülleri ile küresel şekilde meydana gelen mezogözenekli SiO2’nin içine gömülmüş altın nanopartiküllerinin oluştuğunu göstermektedir. Her iki oluşumda da altın nanopartiküllerinin boyutlarının 10 nm’den küçük olduğu görülmektedir. Bu çalışma, atık suda kalmış altının geri kazanılarak altın nanopartikülleri elde edilmesi için yeni bir ürün olduğunu ortaya koymaktadır.

Keywords

altın geri kazanımı, siyanür, mezoogözenekli SiO2, polietilen glikol

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