| Cr???has attracted widely attention due to their high toxicity,persistence and non-degradability in the ecosystem.Graphene Oxide?GO?is a prominent adsorbent for removing heavy metals,dyes and fluoride ions from aqueous solutions due to its special properties of physical and chemical.The existence of irreversibly aggregation during the process of GO preparation in water cause the limitation of GO for heavy metal adsorption.Molybdenum disulfide?MoS2?has been investigated in many fields including electrochemical devices,hydrogen storage,catalysis,capacitors and solid lubricant owning to its unique sandwich like chemical structure.Carbide-derived carbon?CDC?is a class of carbon materials with outstandingly high surface area and pore volume which has been shown a great capacity for gas adsorption.A novel adsorbent MoS2/Graphene Oxide composites?MoS2/GO?were prepared via a facile solvothermal process and effectively used for Cr???adsorption.The characteristics of MoS2/GO were determined with SEM,TEM,XRD,BET and XPS.Results showed the MoS2 layers had been successfully grown on the surface of graphene oxide layers.MoS2/rGO exhibited an enhanced surface area of 81.335 m2/g,more than GO?57.196 m2/g?and MoS2?1.567 m2/g?.Batch adsorption experiments of Cr???were also investigated.Effective Cr???removal occurred in a wide pH range from 2.0 to 10.0,the excellent adsorption capacity at 25°C calculated from Langmuir isotherm model were 268.82 mg/g at pH 2.0 and 192.63 mg/g at pH 4.6.The electrostatic attraction and reduction on the adsorbents surface was considered as the possible mechanism of Cr???removal.These studies revealed the excellent potential application of MoS2/GO for Cr???removal.A novel adsorbent nanoporous carbide-derived carbon?CDC?were prepared from a new precursor,titanium tin carbides?Ti2SnC?,via chlorination at 1000°C,800°C and 600°C,and successfully employed to removing Cr???from waste water.CDC were characterized by SEM,XRD,BET and XPS.Results showed the specific surface area of CDC-1000°C,CDC-800°C and CDC-600°C are 1771.540 m2/g,1548.392 m2/g and 760.494 m2/g,respectively.The adsorption capacity of CDC for Cr???ion from aqueous solutions was well studied and investigated.It indicated that the Cr???adsorption by CDC was highly pH-dependent with a maximum adsorption capacity at pH 2.0.The maximum adsorption capacity at 25°C of CDC-1000°C,CDC-800°C and CDC-600°C are 73.53 mg/g,160.00 mg/g and 73.48 mg/g,respectively.These studies indicated the great capacity of CDC for Cr???removal. |
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