Chemical Composition and Particle Size Analysis of Kaolin

Background: The nano-adsorbents present considerable decontamination potential due to their unique characteristics. This study aimed to investigate the adsorption efficiency and capacity of synthesized nano graphene oxide coated layer over Egyptian clays (bentonite, kaolinite and feldspar) as substrate. The experimental work involves nano graphene oxide coating using acid dehydration via sulfuric acid in presence of different percentage of sugar (fine powder from 1 to 7%), followed by thermal activation to improve the adsorption capacity of natural clay that is locally available in Egypt. Several operating parameters were studied to prepare the superior adsorbent (type of substrate, sulfuric acid concentration, sugar concentration and contact time). Results: The optimum preparation conditions of nano graphene oxide coated bentonite (NGOCB) adsorbent were bentonite substrate 1 kg, sulfuric acid concentration 1.5 kg/kg clay, sugar fine powder 50 g/kg clay, water 3000 ml/kg clay, and stirring time of 30 min at 100°C. The morphology characterization showed that the deposited graphene oxide layer is in the nano form (6 to 33 nm). Sets of experiments were conducted to evaluate the adsorption performance of synthesized NGOCB for removal of methylene blue (MB) dye from aqueous solutions. Effect of initial dye concentration, contact time, pH and temperature on the adsorption capacity of the modified adsorbent were studied. The capacity of the prepared nano graphene oxide coated bentonite adsorbent was 1000 mg/g. Conclusions: The removal efficiency of nano graphene coated clay reached to 99.9% that indicates the Egyptian bentonite could be employed as a low-cost absorbent for dye removal.

show abstract

“…Chemical composition of the used clays(Yahaya et al 2017;Hassan and Abdel-Khalek 1998;Boulos et al 2015) …”

mentioning

confidence: 99%

Adsorption performance of coated bentonite via graphene oxide

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Chemical composition of Kaolin powder consists of 57.6% SiO2 | 37.8% Al2O3 | 0.9% Fe2O3 | 0.6% MgO being the main constituents [42]. Being both a siliceous and aluminous material, Kaolin is a partial pozzolanic additive for cement reacting to form C-S-H and C-A-H products [83].…”

Section: Kaolin (K)mentioning

confidence: 99%

Cementitious, Pozzolanic And Filler Materials For DSM Binders

2020

View full text Add to dashboard Cite

Deep Soil Mix (DSM) is a proven method of ground improvement for deeper underlying soft soil layers which are otherwise impractical to reach using conventional shallow soil stabilization and replacement methods. The predominant binder materials used are Ordinary Portland cement (OPC) and Lime (CaO) but negative effects to the environment from manufacture and increasing construction cost have prompted research into alternative materials. This review identifies pozzolans and filler materials as possible supplements or partial substitutes for better results. The DSM method and binder reaction processes during treated soil strength development are outlined and effectiveness of different pozzolans (Fly Ash, Silica Fume, Ground Granulated Blast Furnace Slag, Rice Husk Ash, Kaolin, and Metakaolin) and filler materials (e.g. fine sand) discussed together with their influence factors. With many pozzolans, a clear optimum dosage is observed where improved strength peaks. Aluminosilicate pozzolans perform better over siliceous pozzolans with Metakaolin (MK) identified as the most effective pozzolan for enhancing compressive strength. Up to date research results on these materials are compiled. MK blended cements are readily available and can be readily applied for initial field tests. Treated soil strength may be regulated with addition of filler materials to further reduce reliance on cement.

show abstract

“…[21][22][23][24][25] Kaolin, a clay mineral which is abundant on the earth, it is composed of abundantly 1 : 1 clay mineral Al 2 Si 2 O 5 (OH) 4 structure per alumina-silicate producing bulky congested particles of SiO 4 tetrahedral sheets and AlO 2 (OH) 4 octahedral sheets. 26,27 Kaolin clay are promising supports due to their common fascinating features, such as their inherent acidity, excellent thermal stability and easily controlled structural morphology. 28 Therefore, the acidied-kaolin with larger specic surface area is widely used as a very good catalyst carrier.…”

Section: Introductionmentioning

confidence: 99%