Method for preparation of water-treatment separation membrane and water-treatment separation membrane prepared thereby
AssigneeLG Chem, Ltd.
InventorsHyelim Kang, Danbi Han, Eun Woo Cho, Hyungjoon Jeon, Chong Kyu Shin, Lakwon Choi
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Abstract
Provided is a method for manufacturing a water-treatment membrane, the method including bringing an aqueous solution including free chlorine and a halogen ion into contact with a polyamide active layer, wherein the free chlorine is present in an amount from 150 ppm to 400 ppm and the halogen ion is present in an amount from 150 ppm to 400 ppm based on the aqueous solution, and a water-treatment membrane manufactured using the same.
Claims8
A method for manufacturing a water-treatment membrane, comprising:
- bringing an aqueous solution including free chlorine and one or a combination of sodium bromide, potassium bromide, calcium bromide, magnesium bromide, ammonium bromide, lithium bromide, germanium bromide, cobalt bromide, strontium bromide, cesium bromide, tungsten bromide, copper(II) bromide, barium bromide or hydrogen bromide to yield a bromine ion into contact with a polyamide active layer on a porous polysulfone support for a contact time of from 15 seconds to 30 seconds, wherein an amount of the free chlorine is from 150 ppm to 400 ppm and an amount of the bromine ion is from 150 ppm to 400 ppm based on the aqueous solution;
- wherein the water-treatment membrane has a bromine element content of greater than 0 at % and less than or equal to 5 at %, a chlorine element content of greater than 0 at % and less than or equal to 1 at %, and a ratio of the bromine element to the chlorine element (Br/Cl) is from 5:1 to 10:1 when measured using an electron spectroscopy for chemical analysis (ESCA) elemental analysis on a surface of the water-treatment membrane using X-ray photoelectron spectroscopy.
A water-treatment membrane having a bromine element content of greater than 0 at % and less than or equal to 5 at % when measured using an electron spectroscopy for chemical analysis (ESCA) elemental analysis on a surface of the water-treatment membrane using X-ray photoelectron spectroscopy,
- wherein:
- the membrane has boron rejection of 93.7% to 96.9% and a salt rejection of 99.90% to 99.96%;
- a chlorine element content is greater than 0 at % and less than or equal to 1 at %, and a ratio of the bromine element to the chlorine element (Br/Cl) is from 5:1 to 10:1.
Dependencies are inferred from the claim text.