Kaolinite contains the largest amount of aluminosilicate, has a high surface area and volume ratio, is closely connected with tetrahedral Si2O5 and octahedral AI2(OH)4 sheets, and thus forms a two-sheet phyllosilicate structure. It belongs to a 1:1 type of clay structural classification. It is also an important and commonly used clay mineral. In this study, the mineral properties of Khongor-Ovoo kaolinite, located in the area of Khar-Airag sum, Dornogovi province, were studied and the prospect of porous silica material was determined by performing time-dependent mechanochemical activation and further dissolution in 20% sulfuric acid. The properties of the material were determined by the methods of X-ray fluorescence (XRF), differential thermal analysis-thermogravimetry (DTA/TG), X-ray diffractometer (XRD), scanning electron microscope (SEM), infrared spectroscope (FTIR), and the parameters of mechanical properties were analyzed. Мetakaolinite prepared by heat-treating the kaolinite mineral from Khongor-Ovoo was processed by mechanochemical activation up to for 30 minutes and then dissolved in 20% sulfuric acid at 90oC, the aluminum content of kaolinite mineral decreased from 26.96% to 2.54%, and the specific surface area of 58.38 m2/g increased to 182 m2/g. The porous silica contains only minor amount of quartz as an impurity. Механохимийн идэвхжүүлэлтээр Хонгор-Овоогийн каолинитаас сүвэрхэг цахиурт материал гарган авах боломж Хураангуй: Каолинит нь алюминосиликат хамгийн их хэмжээгээр агуулдаг, гадаргуугийн талбай болон эзлэхүүний харьцаа өндөртэй, талстын бүтэц дахь тетраэдр Si2O5 хуудас нь октаэдр AI2(OH)4 хуудастай дундын хүчилтөрөгчийн атомоор нягт холбогдож, 1:1 төрлийн шаврын бүтцийн ангилал үүсгэдэг, эдийн засаг болоод үйлдвэрлэлийн хувьд чухал ач холбогдолтой, түгээмэл хэрэглэгддэг шаварлаг эрдэс юм. Энэхүү судалгааны ажлын хүрээнд Дорноговь аймгийн Хар-Айраг сумын нутагт орших Хонгор–Овоогийн каолинитын эрдсийн шинж чанарыг судалж, хугацаанаас хамаарсан механохимийн идэвхжүүлэлтийг хийж, улмаар 20% хүхрийн хүчлээр боловсруулан уусгах замаар сүвэрхэг цахиурт материал гарган авах боломжийг тогтоосон. Материалын шинж чанарыг рентгенфлуоросценци (XRF), дифференциал дулааны анализ-термогравиметр (DTA/TG), рентгендифрактометр (XRD), сканнинг электрон микроскоп (SEM), нил улаан туяаны спекроскопи (FTIR)-ын аргуудаар тодорхойлсноос гадна механик шинж чанарын үзүүлэлтүүдийг тооцоолон гаргасан. Судалгааны үр дүнд Хонгор-Овоогийн каолинитын эрдсийг дулааны боловсруулалтад оруулан метакаолинит бэлтгэн, цааш метакаолинитыг нүүрстөрөгчийн нано хоолойн нэмэлтэйгээр 30 минут механохимийн идэвхжүүлэлтийн аргаар боловсруулж, улмаар 20%-ийн хүхрийн хүчилд 900С-д уусгахад каолинитын хөнгөнцагааны агуулга 26.96%-иас 2.54% хүртэл буурч, хувийн гадаргуугийн талбайн 58.38 м2 /г-аас 187.2 м2 /г болж өсөн, эрдсийн хувьд дан кварц бүхий, нүх сүвэрхэг бүтэцтэй цахиурт материал үүссэн. Түлхүүр үг: Метакаолинит, хүчлийн уусгалт, хөнгөнцагааны уусалт, гадаргуугийн талбай, нүх сүв.
In developed countries, nanoparticles derived from natural minerals and high-purity chemicals both are widely studied, while in developing countries like Mongolia, the natural minerals-based nanoparticles have more interest because of the low production cost and applicability of domestic natural minerals for their production. For the synthesis of natural mineral-based nanomaterials, it is important first to define the chemical composition and physical structure of local minerals and their possible processing route. We employed an environmentally friendly alkaline leaching procedure to recover silica from the clay mineral at 90°C for 24 hours. We applied an organic surfactant (CTAB) and a simple coprecipitation approach to form iron-doped silica nanoparticles. Consequently, we used iron-doped silica nanoparticles as a substrate and catalyst for the synthesis of carbon nanosphere at 750 °C for 1 hour in an argon and acetylene gas atmosphere. As a result, vast quantities of superhydrophobic carbon nanospheres (CNS) were obtained. The physicochemical properties of nanosilica substrate, non-functionalized carbon nanosphere, and functionalized carbon nanosphere (CNS) samples were characterized using XRD, XRF, SEM, EDS, TEM, and FTIR spectrometer. Iron-doped mineral-derived nanosilica particles demonstrated high catalytic efficiency and the potential to produce a large amount of value-added carbon nanospheres. Superhydrophobic CNS can be used in a variety of applications, particularly drug delivery; however, to use CNS in both aqueous and non-aqueous media, the superhydrophobic properties of CNS can be modified using different oxidizers. The changes in hydrophobicity of the CNS were examined and suggested possible oxidizing agents.
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