| The environmental problems caused by industrial wastewater pose great threats and challenges to people.The adsorption method is one of the methods for treating wastewater,but the adsorption material with excellent performance is less.This thesis provides two effective methods for preparing composite adsorbent materials.In this thesis,the stabilizing effect of humic acid/sepiolite composite colloidal particles on Pickering emulsion was studied.Several magnetic humic acid-based composite adsorbents were prepared by interfacial polymerization and chemical cross-linking using emulsion droplets as template.The adsorption properties of composite adsrobents forCr(VI)ions,Cu(II)ions,amino black dyes and rhodamine B dyes in water were investigated.The specific study results are as follows:(1)The humic acid/sepiolite composite colloidal particles have a good stabilizing effect on the Pickering emulsion.Sepiolite can not stabilize the emulsion separately,and the humic acid/sepiolite composite particles can stabilize the emulsion formed by different oil phases by using the synergistic effect of humic acid.The increase of sepiolite content will make the droplet size of the formed emulsion smaller.When the content of sepiolite is higher than a certain extent,the particle size does not change significantly.The humic acid/sepiolite composite particle-stabilized Pickering emulsion can be applied to prepare polystyrene/sepiolite composite microspheres.(2)Magnetic polyaniline/sepiolite/humic acid/polystyrene composite microsphere adsorbent and magnetic polypyrrole/sepiolite/humic acid/polystyrene composite microsphere adsorbent were prepared by two-stage polymerization and interfacial chemical oxidative polymerization using a humic acid/sepiolite composite particle-stabilized Pickering emulsion droplet as a template.Systematic studies on the removal of Cr(VI)from two materials showed that SA3 and SP4 had the best adsorption performance;pH=2 was the best adsorption condition,and the maximum adsorption capacity was 7.94 mg/g and 12.57 mg/g,respectively.For the two kinds of adsorbent,the adsorption equilibrium time are both 420 min and the adsorption behavior both follow the quasi-second-order kinetic equation and the Langmuir isothermal model.The obtained adsrobents have a certain regenerative adsorption capacity.(3)Magnetic polyaniline/sepiolite/humic acid composite microcapsule adsorption material and magnetic polyaniline/sepiolite/humic acid composite microcapsule adsorption material were prepared by means of interface chemical oxidative polymerization using humic acid/sepiolite composite particle-stabilized Pickering emulsion droplets as template.Systematic study on the removal of Cr(VI)from two materials showed that A3 and P3 had the best adsorption performance.When pH=2 and adsorbent with the concentration of 1g/L,the maximum adsorptioncapacity was 227.98mg/g and 226.20 mg/g,the adsorption equilibrium time is 420 min.The adsorption behavior follow the quasi-second-order kinetic equation and the Langmuir isotherm model.The adsorbents have excellent regenerative adsorption capacity.The adsorption results of amino black showed that A2 and P3 had the best adsorption performance.When the concentration of adsorbent was 1g/L,the maximum adsorption capacities were 127.85 mg/g and 72.62 mg/g,respectively.The adsorption equilibrium time was 420 min and 360 min,respectively.The adsorption behavior followed the quasi-second-order kinetic equation and the Langmuir isotherm model.(4)The magnetic chitosan/sepiolite/humic acid composite adsorbent were prepared by chemical cross-linking using the humic acid/sepiolite composite particle-stabilized Pickering emulsion droplets as template.Cu(II)ion adsorption experimental results showed that HSC8:2 had the best adsorption performance and had the best adsorption effect at the pH value of 5.The maximum adsorption capacity was 33.49 mg/g,the adsorption equilibrium time was 60 min,and the adsorption behavior followed the quasi-second-order kinetic equation and Langmuir isotherm model.Rhodamine adsorption experimental results showed that HSC8:2 had the best adsorption performance and the adsorption equilibrium time was 420 min.The maximum adsorption capacity was 47.82 mg/g,and the adsorption behavior followed the quasi-second-order kinetic equation and the Langmuir model. |
PDF Full Text Request