Surface modification of diatomaceous earth and its oil-water adsorption process
With calcined 800 ℃ diatomaceous earth as raw material,the surface modification of diatomaceous earth was carried out using silane coupling agent(KH-570),sodium dodecyl benzene sulfonate(SDBS)and their coordination,and the effects of different modifier addition,reaction temperature,and reaction time on the adsorption effect of modified diatomaceus earth were investigated.The modified diatomite was characterized by SEM and FT-IR.The effects of the process parameters on the modified diatomite were evaluated by calculating the contact angle,oil absorption rate and adsorption capacity.The experiments showed that the synergistically modified diatomaceous earth had a better hydrophobicity and oil absorption effect compared with the two modifiers alone,and its contact angle and oil absorption rate could reach1 45.1° and 95.8％,respectively.Moreover,when the mass ratio of the silane coupling agent to sodium dodecyl benzene sulfonate was 1∶4,the modification temperature was 75 ℃ and the reaction time was 2 h,the highest adsorption capacity of 3.5 g/g was achieved for the simulated case of offshore diesel oil.
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