炭吸附剂吸附水中残余浮选捕收剂煤油研究

Study on Adsorption of Residual Flotation Collectors by Carbon Adsorbents in Water

以粉煤灰中的未燃炭粒(UC)和粉状活性炭(PAC)为吸附剂,研究对水体中残余煤油吸附性能。结果表明,UC和PAC的吸附过程符合Freundlich等温式和准2级反应动力方程,在吸附初期主要由边界层扩散为主,后期主要以微孔内扩散为主,并最终达到平衡状态。在搅拌转速190 r/min、吸附剂的质量浓度0.5 g/L时适宜吸附,且升温有利于吸附。对于初始煤油的质量浓度250 mg/L的水体,PAC在任何pH下,去除率都在70%以上;UC在pH=2时,吸附能力为佳,去除率为74.24%。AC能直接用于浮选废水处理,而UC需要进一步活化处理,提高吸附能力和适应性。

Unburned carbon particles(UC)in coal fly ash and powdered activated carbon(PAC)were used as adsorbents,and the adsorption performance for residual kerosene in water was studied.The results showed that,the UC and PAC adsorption process conformed to Freundlich isothermal and pseudosecond-order kinetic equation,in the initial adsorption stage,the diffusion was dominant in boundary layer,and intracellular diffusion was dominant in the later period,and eventually reached the equilibrium.When mixing strength was 190 r/min and adsorbent mass concentration was 0.5 g/L,the adsorption was well,and the increase of temperature was beneficial to adsorption.The removal rate of PAC was over 70%at any pH condition when initial mass concentration of kerosene was 250 mg/L.The best removal rate of UC was 74.24%when pH was 2.PAC can be directly used in flotation wastewater treatment,while UC needs further activation treatment to improve adsorption capacity and adaptability.