Synthesis of molybdenum disulfide/reduced graphene oxide composites for effective removal of Pb(Ⅱ) from aqueous solutions

作者：Yi Du; Jian Wang; Yidong Zou; Wen Yao; Jing Hou; Liangshu Xia; Anguo Peng; Ahmed Alsaedi; Tasawar Hayat; Xiangke Wang

来源：Science Bulletin, 2017, 62(13): 913-922.

• Molybdenum disulfide
• Reduced graphene oxide
• MoS2/rGO composites
• Adsorption
• Pb(Ⅱ)

In this work,a facile method was adopted to synthesize molybdenum disulfide/reduced graphene oxide(MoS2/rGO) composites through an L-cysteine-assisted hydrothermal technique.The as-prepared MoS2/rGO composites were firstly applied as adsorbents for efficient elimination of Pb(Ⅱ) ions.Batch adsorption experiments showed that the adsorption of Pb(Ⅱ) on MoS2/rGO followed pseudo-second-order kinetic model well.The adsorption of Pb(Ⅱ) was intensely pH-dependent,ionic strength-dependent at pH < 9.0 and ionic strength-independent at pH > 9.0.The presence of humic acid(HA) enhanced Pb(Ⅱ)adsorption obviously.The MoS2/rGO composites exhibited excellent adsorption capacity of384.16 mg g 1 at pH 5.0 and T= 298.15 K,which was superior to MoS2(279.93 mg g 1) and many other adsorbents.The thermodynamic parameters suggested that the adsorption process of Pb(Ⅱ) on MoS2/rGO composites was spontaneous(AG~θ < 0) and endothermic(AH~θ > 0).The interaction of Pb(Ⅱ) and MoS2/rGO was mainly dominated by electrostatic attraction and surface complexation between Pb(Ⅱ) and oxygen-containing functional groups of MoS2/rGO.This work highlighted the application of MoS2/rGO as novel and promising materials in the efficient elimination of Pb(Ⅱ) from contaminated water and industrial effluents in environmental pollution management.

• 单位
  南华大学; 华北电力大学