Ultrafine continuous fibrous ceramic filter and method of manufacturing same

A method for preparing a ceramic filter, which comprises the steps of:

• (1) electrospinning a metal oxide precursor sol-gel solution or a mixture of a metal oxide precursor sol-gel solution and a polymer resin to make a layer of continuous ultrafine fibers randomly arranged, wherein the metal oxide precursor is selected from a group consisting of M(OR)x, MRx(OR)y, MXy, and M(NO3)y, wherein
• M comprises Si (silicon) or Al (aluminum),
• R comprises an alkyl group,
• X is selected from the group consisting of F (fluorine), CI (chlorine), Br (bromine) and I (iodine),
• x and y are each independently an integer of 1 to 4;
• and
• (2) sintering the electrospun ultrafine fibers at a temperature ranging from 250 to 1000° C., wherein (A) in step (1), before the electrospinning, the metal oxide precursor sol-gel solution or the mixture of the metal oxide precursor sol-gel solution and the polymer resin is additionally mixed with one-dimensional powdery nano-alumina;
• (B) the sintered ultrafine fibers from step (2) are impregnated or coated with a suspension of one-dimensional powdery nano-alumina;
• or (A) and (B) both are performed.