Adsorption performance of crystal violet in water by magnetic sodium lignonate hydrogel
The magnetic sodium lignosulfonate hydrogel(Fe3O4@LS)was prepared through free radical graft copolymerization and in-situ precipitation for the treatment of dye wastewater.The preparation process is simple and environmentally friendly,which could realize the high-value utilization of lignin.The adsorption performance of Fe3O4@LS to crystal violet(CV)in water were investigated.Results demonstrated that at 25 ℃,Fe3O4@LS dosage of 400 mg·L-1,pH 7.0,an initial CV concentration of 100 mg·L-1,and an adsorption time of 80 min,the equilibrium adsorption capacity reached the maximum value of 237.08 237.08 mg·g-1 with the highest CV removal rate of 94.83％.The adsorption behavior followed the pseudo-second-order kinetic equation and Langmuir adsorption model.Both monovalent and divalent metal ions could inhibit CV adsorption on Fe3O4@LS.Moreover,Fe3O4@LS displayed an excellent magnetic response facilitating easy recovery.Regeneration experiments confirmed that Fe3O4@LS is an outstanding biomass adsorbent material with recycling potential.The structure-activity analysis showed that the good adsorption performance of Fe3O4@LS was due to its abundant active sites and pore structures.
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