【摘 要】
：
Cadmium (Cd),lead (Pb),and hexavalent chromium (Cr(Ⅵ)) are often found in soils and water affected by metal smelting,chemical manufacturing,and electroplating.In this study,synthetic iron sulfide nanopar-ticles (FeS NPs) were stabilized with carboxymethyl
【机 构】
：
State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 40004
论文部分内容阅读
Cadmium (Cd),lead (Pb),and hexavalent chromium (Cr(Ⅵ)) are often found in soils and water affected by metal smelting,chemical manufacturing,and electroplating.In this study,synthetic iron sulfide nanopar-ticles (FeS NPs) were stabilized with carboxymethyl cellulose (CMC) and utilized to remove Cr(Ⅵ),Cd,and Pb from an aqueous solution.Batch experiments,a Visual MINTEQ model,scanning electron micro-scopy (SEM),X-ray diffraction (XRD),and X-ray photoelectron spectrometer (XPS) analysis were used to determine the removal efficiencies,influencing factors,and mechanisms.The FeS NP suspension simul-taneously removed Cr(Ⅵ),Cd,and Pb from an aqueous solution.The concentrations of Cr(Ⅵ),Cd,and Pb decreased from 50,10,and 50 mg·L-1 to 2.5,0.1,and 0.1 mg·L-1,respectively.The removal capacities were up to 418,96,and 585 mg per gram of stabilized FeS NPs,respectively.The acidic conditions signif-icantly favored the removal of aqueous Cr(Ⅵ) while the alkaline conditions favored the removal of Cd and Pb.Oxygen slightly inhibited the removal of Cr(Ⅵ),but it had no significant influence on the removal of Cd and Pb.A potential mechanism was proposed for the simultaneous removal of Cr(Ⅵ),Cd,and Pb using FeS NPs.The interactions of the three heavy metals involved a cationic bridging effect on Cr(Ⅵ) by Cd,an enhanced adsorption effect on Cd by[Cr,Fe](OH)3,precipitation of PbCrO4,and transformation of PbCrO4 to PbS.Therefore,FeS NPs have a high potential for use in the simultaneous removal of Cr(Ⅵ),Cd,and Pb from contaminated aqueous solutions.
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