Sorbent Material and Method of Making the Same
AssigneeMarmon Water (Singapore) Pte. Ltd.
InventorsRamachandra Swamy, Mallikarjuna Shroff Rama, Indumathi Ramakrishnan
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Abstract
A surfactant containing activated carbon-based media for efficient removal of volatile organic compounds (VOCs) from water and air. The media is prepared by treating porous activated carbon with an oxidizing agent to render oxidized activated carbon, which is then soaked in a surfactant containing solution. The surfactant impregnates into the pores and on surfaces of the oxidized activated carbon to render surfactant impregnated activated carbon that is capable of enhancing reduction of VOCs. The surfactant impregnated activated carbon media may be made into filter blocks or provided into filter cartridges.
Claims25
A method of fabricating treated sorbent material that removes volatile organic compounds (VOCs) from water and air comprising:
- providing porous activated carbon;
- treating the porous activated carbon with an oxidizing agent to render oxidized activated carbon;
- soaking the oxidized activated carbon in a surfactant containing solution, wherein the surfactant is selected from the group consisting of alkylammonium compounds, alkyl phosphonium compounds, long chain quaternary ammonium salts, phosphonium salts, phopahtidylcholine, lysine, arginine, alkylethoxylates, dodecyl trimethyl ammonium bromide (DTAB), and lecithin;
- impregnating the surfactant into pores and on surfaces of the oxidized activated carbon, whereby weight percentage of the surfactant concentration in solution with respect to weight of the oxidized activated carbon on dry basis ranges from 0.005 wt. % to 2 wt. %;
- separating the soaked impregnated activated carbon from the surfactant containing solution;
- and
- drying the soaked impregnated activated carbon to render surfactant impregnated activated carbon having the surfactant trapped within the pores thereof, the surfactant impregnated activated carbon capable of enhancing reduction of VOCs.
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A method of fabricating treated sorbent material that removes volatile organic compounds (VOCs) from water and air comprising:
- providing porous activated carbon;
- treating the porous activated carbon with a phosphoric acid solution having a concentration ranging from about 1.0% v/v to about 1.6% v/v;
- draining the phosphoric acid solution to render oxidized activated carbon;
- soaking the oxidized activated carbon in a dodecyl trimethylammonium bromide (DTAB) surfactant containing solution;
- impregnating the DTAB into pores and on surfaces of the oxidized activated carbon, whereby weight percentage of the DTAB concentration in solution with respect to weight of the oxidized activated carbon on dry basis ranges from about 0.01% w/w to about 0.5% w/w;
- separating the soaked impregnated activated carbon from the DTAB containing solution;
- and
- drying the soaked impregnated activated carbon to render DTAB impregnated activated carbon having the DTAB trapped at least within the pores thereof, the DTAB impregnated activated carbon capable of removing VOCs from a contaminated source.
A method of fabricating treated sorbent material that removes volatile organic compounds (VOCs) from water and air comprising:
- providing porous activated carbon;
- treating the porous activated carbon with a phosphoric acid solution having a concentration ranging from about 1.0% v/v to about 1.6% v/v;
- draining the phosphoric acid solution to render oxidized activated carbon;
- soaking the oxidized activated carbon in a lecithin surfactant containing solution;
- impregnating the lecithin into pores and on surfaces of the oxidized activated carbon, whereby weight percentage of the lecithin concentration in solution with respect to weight of the oxidized activated carbon on dry basis ranges from about 0.01% w/w to about 0.5% w/w;
- separating the soaked impregnated activated carbon from the lecithin containing solution;
- and
- drying the soaked impregnated activated carbon to render lecithin impregnated activated carbon having the lecithin trapped at least within the pores thereof, the lecithin impregnated activated carbon capable of removing VOCs from a contaminated source.
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Dependencies are inferred from the claim text.