[Introduction]The adsorbability of a heavy metal chelating adsorbent(named as HDTC)prepared with carbon disulfide,diethylenetriamine,and epichlorohydrin to nickel and hexavalent chromium ions in wastewater was studied.[Method]The HDTC sample was characterized by using Brunauer-Emmett-Teller(BET)surface area analyzer,Fourier-transform infrared spectrometer(FTIR),and scanning electron microscope(SEM).The kinetic and thermodynamic behaviors and recycling performance of HDTC for adsorption of nickel and hexavalent chromium were studied.The effect of initial pH on the adsorption efficiency of HDTC was also examined.[Result]The saturated adsorption capacity of HDTC was 220.2 mg/g for nickel ions and 225.7 mg/g for hexavalent chromium ions at an initial pH of 5-6 and a temperature of 25 ℃.The adsorption of nickel and hexavalent chromium ions by HDTC was in line with the second-order adsorption kinetic model and Langmuir adsorption isotherm model.[Conclusion]The homemade HDTC can effectively adsorb uncomplexed heavy metal ions.
heavy metal chelating adsorbentadsorptionnickel ionhexavalent chromium
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