US 12,434,987 B1Granted

Carboxymethyl cellulose hydrogel loaded with titanium oxide nanoparticles for wastewater treatment

AssigneeKing Faisal University

InventorsHany Mohamed Abd El-Lateef Ahmed, Mai Mostafa Khalaf Ali, Mohamed Gouda, Mohammed Abbas Alsaeed, Fatima Essa Al Rasheed

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Abstract

A carboxymethyl cellulose hydrogel loaded with TiO2 nanoparticles for wastewater treatment is provided. The TiO2NPs@CMC hydrogel is made by a method including providing raw date fiber, bleaching the raw date fiber, delignifying the bleached raw date fiber, and then performing alkalization and etherification on the bleached raw date fiber to produce date derived CMC; followed by dissolving the CMC in calcium chloride to form a paste-like solution, adding TiO2NPs to the paste-like solution, and freeze-drying the paste-like solution to obtain the TiO2NPs@CMC hydrogel. The TiO2NPs@CMC hydrogel is effective for degrading pathogens contaminating wastewater and preventing biofilm formation in wastewater systems.

Claims18

Dependent claims

A method of making a carboxymethyl cellulose (CMC) hydrogel loaded with TiO2 nanoparticles (NPs) comprising:

providing raw date fiber;
bleaching the raw date fiber to obtain bleached date fiber;
delignifying the bleached date fiber to obtain delignified date fiber;
alkalizing the delignified date fiber to obtain alkalized date fiber;
esterifying the alkalized date fiber to obtain date derived carboxymethyl cellulose;
dissolving the date derived carboxymethyl cellulose in calcium chloride to form a paste solution of CMC-CaCl2;
adding about 0.6 g of TiO2NPs to the paste solution to obtain a mixture;
stirring the mixture for about 4 hours to obtain a TiO2NPs-CMC-CaCl2 paste;
storing the TiO2NPs-CMC-CaCl2 paste for about 24 hours followed by washing and centrifuging to obtain washed TiO2NPs-CMC-CaCl2 paste;
refrigerating the washed TiO2NPs-CMC-CaCl2 paste for about 24 hours;
and freeze drying for about 48 hours to obtain a TiO2NPs-CMC-CaCl2) hydrogel.

8 more elements

Dependencies are inferred from the claim text.