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Using N -isopropylacrylamide (NIPAM) and acrylic acid (AAc) as monomers, N , N '-methylenebisacrylamide (MBA) as a cross-linking agent, and molybdenum disulfide (MoS 2 ) as functional particles, a P(NIPAM- co -AAc)/MoS 2 composite hydrogel was prepared by free radical polymerization initiated by ultraviolet light. The results of Fourier transform infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy show that MoS 2 has been successfully introduced into the P(NIPAM- co -AAc) system, and the obtained composite hydrogel has a porous network structure. Studies on the swelling property and dye adsorption performance show that the addition of MoS 2 can increase the swelling ratio of P(NIPAM- co -AAc) hydrogels to a certain extent and can significantly improve the ability of the P(NIPAM- co -AAc) hydrogel to adsorb methylene blue (MB). The adsorption process of MB by the composite hydrogels conforms to the pseudo-second-order kinetics and the Langmuir isotherm adsorption models. The estimated equilibrium adsorption capacity ( Q  m ) using the Langmuir isotherm model can reach 1258 mg/g, mainly due to the electrostatic interaction between the negatively charged groups -COO - and MoS 2 particles on the network structure and the positively charged dye MB. The adsorption of MB by P(NIPAM- co -AAc)/MoS 2 composite hydrogels depends on the temperature during adsorption. Compared with room temperature, a high temperature of 40 °C above the poly( N -isopropylacrylamide) (PNIPAM) phase transition temperature (∼32 °C) leads to a decreased adsorption capacity of the P(NIPAM- co -AAc)/MoS 2 composite hydrogel for MB due to the enhanced hydrophobic properties of the network structure and the decrease of the swelling ratio. The prepared hydrogel material can be used as a good adsorbent for dyes, which is promising in wastewater treatment.

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Facile Preparation and Dye Adsorption Performance of Poly(<i>N</i>-isopropylacrylamide-<i>co</i>-acrylic acid)/Molybdenum Disulfide Composite Hydrogels

Facile Preparation and Dye Adsorption Performance of Poly(N-isopropylacrylamide-co-acrylic acid)/Molybdenum Disulfide Composite Hydrogels