KOH Activated Multi-walled Carbon Nanotubes With Enhanced Adsorption Performance Towards Diclofenac Removal in Water
Multi-walled carbon nanotubes(MWCNTs)were activated by KOH to make a new adsorbent K-MWCNTs,and the adsorption characteristics of the adsorbent on diclofenac(DCF)in water were studied under different pH,contact time,temperature,ionic strength and humic acid(HA)concentration.The results showed that K-MWCNTs the adsorption capacity of K-MWCNTs was improved about 5 times with dosage of adsorbent was 400 mg/L,compared with MWCNTs;The adsorption reached the maximum(82.0 mg/g)when pH was 5.0;The adsorption equilibrium was more consistent with the pseudo-second-order kinetics model.Langmuir model could be better described the adsorption isotherm.The adsorption of DCF onto K-MWCNTs was inhibited by high concentration of ion and HA.The adsorption process of K-MWCNTs mainly involves electrostatic interaction,π-π bond and Van der Waals force,which could be used for efficient removal of DCF in groundwater:model.Langmuir model could be better described the adsorption isotherm.The adsorption of DCF onto K-MWCNTs was inhibited by ionic strength and humic acid.The adsorption process mainly involves electrostatic interaction,π-π bond and Van der Waals force.
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