Waste sludge from waste water treatment plants was treated with the carbon disulfide in alkaline medium to prepare xanth, aiming to explore an efficient way to recycle waste sludge. Fourier transform infrared spectroscopy (FTIR) was applied to characterize the sludge. Batch experiments were conducted to investigate the adsorption property of Cu2+ as well as effecting factors including pH and initial concentration of Cu2+ . Results show that the chemical modification introduces sulfur groups successfully and the adsorption capacity of xanthate-functionalized sludge increases by 20.6%- 46. 9% comparing to the pristine waste sludge. The Cu2+ removal efficiency of xanthate-functionalized sludge reaches 96.7% when the initial concentration of Cu2+ is 25 mgL-1. The adsorption process can attain equilibrium within 3 hours and kinetics is found to be best-fit the Pseudo-second-order equation. The process is jointly controlled by film diffusion and intraparticle diffusion. Both Langmuir model and Freundlich model can describe the adsorption, process well. The maximum adsorption capacity given by the Langmuir model is 142.92 mgg-1 at 25 degree C (pH = 5). Adsorption capacity increases with pH value (1-5) and initial Cu2+ concentration. The xanthate-functionalized sludge can be used as high performance adsorbents to recycle waste resources.
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