Study on the Adsorption of Cr(Ⅵ)by Zinc Chloride Modified Sugarcane Bagasse Biochar
A new type of modified biochar was prepared from bagasse by Zinc Chloride modification which was used as an adsorbent to remove Cr(Ⅵ)from water.Scanning electron microscope(SEM)and Fourier Transform infrared spectroscopy(FTIR)were used to characterize the surface structure,aperture,specific surface area and surface functional groups of biomass charcoal before and after modification.The optimal adsorption conditions were determined and the influence of various factors on the adsorption effect was explored through five sets of single-factor control experiments including initial concentration,dosage of adsorbent,temperature,time and pH value.The results showed when the dosage of modified biochar was 2 g·L-1,temperature was 35 ℃,pH was 2.0,adsorption time was 120 min,and the initial mass concentration of Cr(Ⅵ)was 100 mg·L-1,the adsorption capacity of Cr(Ⅵ)was 45.64 mg·g-1,and the Cr(Ⅵ)removal rate reached 91.64％.The adsorption of Cr(Ⅵ)by biochar conforms to Langmuir isothermal adsorption model,the adsorption process conforms to the quasi-second-order kinetic equation.
万方数据
维普
