Alumina Coating To Realize Desired Pore Characteristics Of Sintered Diatomite Membrane

Abstract

Porous ceramic membranes prepared from natural materials such as diatomite, have lately attracted great interest in industrial applications due to their cost-effectiveness. In this study, we attempted to prepare an alumina coating to be deposited over a sintered diatomite-kaolin composite support layer in order to reduce the largest pore size to below 0.4 µm; such a coating could be potentially used in water treatment applications for bacterial removal.

Effect of Processing Conditions on the Properties of Reticulated Porous Diatomite–Kaolin Composites

“…Various types of porous diatomite-kaolin composites fabricated by different preparation methods have been described in our previous studies [12,[20][21][22][23][24][25][26][27][28][29][30][31] and in those of other research groups [32][33][34][35][36]. However, to the best of our knowledge, only a few have focused on the detailed preparation and characterization of reticulated porous diatomite-kaolin composites, besides our previous report that discussed the feasibility [3].…”

Preparation processes and characterizations of alumina-coated alumina support layers and alumina-coated natural material-based support layers for microfiltration

“…(4) We determined the air permeability of the diatomite-kaolin composite-coated diatomite-kaolin composite support layer [17]. (5) the air permeability of an alumina-coated diatomitekaolin composite support layer [15,16,18], along with (6) the water permeability (using pure water) and rejection rate (using ISO 12103-1 A3 test dust) of a diatomite-kaolin composite support layer [13]. Finally, and most notably, (7) we evaluated the water permeability (using pure water) and the reliability of the aluminacoated diatomite-kaolin composite support layer were determined.…”

“…The mechanical strength of a diatomite support layer is not acceptable for a free-standing membrane, therefore, we introduced kaolin to tailor the pore characteristics of the diatomite support layer. Previously, we reported possible approaches for fabrication of a diatomite-based support layer that allowed fine-tuning of the pore characteristics [13][14][15][16][17][18][19][20][21][22].…”

Preparation and Characterization of a Low-Cost and Natural Material-Based Reticulated Porous Diatomite-Kaolin Composite

“…Detailed descriptions and basic properties of diatomite have been comprehensively explained in previous reports [18][19][20][21][22][23][24][25][26][27][28][29][30]. Recently, the authors reported several types of porous diatomite such as (1) uniaxially-pressed diatomite-based support layers for microfiltration [18][19][20][21][22][23][24][25][26][27], (2) extruded diatomite-based support layers for microfiltration [28,29], and (3) particle-stabilized diatomite foam with a bimodal pore structure [30]. However, to the best of author's knowledge, there are no studies on the preparation and characterizations of reticulated porous diatomite-kaolin composite.…”