Chitosan based high performance filter with self-regenerating ability

• Main Authors: Chan, Mui, Ho, Yee Man, Li, Jifan, Chan, Wai Yan, Yeung, Kai Ming, Lee, Ka Chun
• Format: Patent
• Language: English
• Published: 29.05.2018
• Subjects: AGRICULTURE; ANIMAL HUSBANDRY; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; FISHING; FORESTRY; HUMAN NECESSITIES; HUNTING; PERFORMING OPERATIONS; PEST REPELLANTS OR ATTRACTANTS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PLANT GROWTH REGULATORS; PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING; TRAPPING

A self-regenerating chitosan based filter medium for disinfecting and purifying organic pollutants and other pollutants in a gas or liquid is disclosed herein. Porosity and surface charge of said filter medium is manipulative/tunable by varying one or more of the following parameter(s): concentration of chitosan, crosslinking density, amount of copolymers and additives, freezing temperature, freezing profile, and/or types of crosslinker used. The present filter medium is capable of self-regenerating under exposure to ultra-violet light for sufficient time and removing over 90% of the pollutants from each influent flowing through the filter medium.