Jun Wu

Publications (3)9.76 Total impact

• Article: Biosorption of Cr(III) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and thermodynamic studies

  Qian Yao, Hua Zhang, Jun Wu, Liming Shao, Pinjing He
  [show abstract] [hide abstract]
  ABSTRACT: Batch biosorption experiments were conducted to remove Cr(III) from aqueous solutions using activated sludge from a sewage treatment plant. An investigation was conducted on the effects of the initial pH, contact time, temperature, and initial Cr(III) concentration in the biosorption process. The results revealed that the activated sludge exhibited the highest Cr(III) uptake capacity (120 mg·g−1) at 45°C, initial pH of 4, and initial Cr(III) concentration of 100 mg·L−1. The biosorption results obtained at various temperatures showed that the biosorption pattern accurately followed the Langmuir model. The calculated thermodynamic parameters, ΔGo° ( − 0.8–4.58 kJ·mol−1), ΔH° (15.6–44.4 kJ·mol−1), and ΔS° (0.06–0.15 kJ·mol−1·K−1) clearly indicated that the biosorption process was feasible, spontaneous, endothermic, and physical. The pseudo first-order and second-order kinetic models were adopted to describe the experimental data, which revealed that the Cr(III) biosorption process conformed to the second-order rate expression and the biosorption rate constants decreased with increasing Cr (III) concentration. The analysis of the values of biosorption activation energy (E a = −7 kJ·mol−1) and the intraparticle diffusion model demonstrated that Cr(III) biosorption was film-diffusion-controlled. Keywordsactivated sludge-biosorption-chromium-film diffusion-kinetics-thermodynamics
  Frontiers of Environmental Science & Engineering in China 04/2012; 4(3):286-294. · 0.75 Impact Factor
• Article: Insight into the heavy metal binding potential of dissolved organic matter in MSW leachate using EEM quenching combined with PARAFAC analysis.

  Jun Wu, Hua Zhang, Pin-Jing He, Li-Ming Shao
  [show abstract] [hide abstract]
  ABSTRACT: Dissolved organic matter (DOM) plays an important role in heavy metal migration from municipal solid waste (MSW) to aquatic environments via the leachate pathway. In this study, fluorescence excitation-emission matrix (EEM) quenching combined with parallel factor (PARAFAC) analysis was adopted to characterize the binding properties of four heavy metals (Cu, Pb, Zn and Cd) and DOM in MSW leachate. Nine leachate samples were collected from various stages of MSW management, including collection, transportation, incineration, landfill and subsequent leachate treatment. Three humic-like components and one protein-like component were identified in the MSW-derived DOM by PARAFAC. Significant differences in quenching effects were observed between components and metal ions, and a relatively consistent trend in metal quenching curves was observed among various leachate samples. Among the four heavy metals, Cu(II) titration led to fluorescence quenching of all four PARAFAC-derived components. Additionally, strong quenching effects were only observed in protein-like and fulvic acid (FA)-like components with the addition of Pb(II), which suggested that these fractions are mainly responsible for Pb(II) binding in MSW-derived DOM. Moreover, the significant quenching effects of the FA-like component by the four heavy metals revealed that the FA-like fraction in MSW-derived DOM plays an important role in heavy metal speciation; therefore, it may be useful as an indicator to assess the potential ability of heavy metal binding and migration.
  Water Research 02/2011; 45(4):1711-9. · 4.86 Impact Factor
• Article: Cr(VI) removal from aqueous solution by dried activated sludge biomass.

  Jun Wu, Hua Zhang, Pin-Jing He, Qian Yao, Li-Ming Shao
  [show abstract] [hide abstract]
  ABSTRACT: Batch experiments were conducted to remove Cr(VI) from aqueous solution using activated sludge biomass. The effects of acid pretreatment of the biomass, initial pH, biomass and Cr(VI) concentrations on Cr(VI) removal efficiency were investigated. Proton consumption during the removal process and the reducing capacity of sludge biomass were studied. The results show that acid pretreatment could significantly improve Cr(VI) removal efficiency and increase Cr(VI) reducing capacity by 20.4%. Cr(VI) removal was remarkably pH-dependent; lower pH (pH=1, 2) facilitated Cr(VI) reduction while higher pH (pH=3, 4) favored sorption of the converted Cr(III). Lower Cr(VI) concentration as well as higher biomass concentration could accelerate Cr(VI) removal. Cr(VI) reduction was not the only reason for proton consumption in the removal process. Pseudo-second-order adsorption kinetic model could successfully simulate Cr(VI) removal except under higher pH conditions (pH=3, 4).
  Journal of hazardous materials 12/2009; 176(1-3):697-703. · 4.14 Impact Factor