Yanfang Xu

Publications (2)4.98 Total impact

• Article: Use of rice husk for the adsorption of congo red from aqueous solution in column mode.

  Runping Han, Dandan Ding, Yanfang Xu, Weihua Zou, Yuanfeng Wang, Yufei Li, Lina Zou
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  ABSTRACT: A continuous fixed bed study was carried out by using rice husk as a biosorbent for the removal of congo red (CR) from aqueous solution. The effects of important factors, such as the value of initial pH, existing salt, the flow rate, the influent concentration of CR and bed depth, were studied. Data confirmed that the breakthrough curves were dependent on flow rate, initial dye concentration and bed depth. Thomas, Adams-Bohart, and Yoon-Nelson models were applied to experimental data to predict the breakthrough curves using non-linear regression and to determine the characteristic parameters of the column useful for process design, while bed depth/service time analysis (BDST) model was used to express the effect of bed depth on breakthrough curves. The results showed that Thomas model was found suitable for the normal description of breakthrough curve at the experimental condition, while Adams-Bohart model was only for a initial part of dynamic behavior of the rice husk column. The data were in good agreement with BDST model. It was concluded that the rice husk column can remove CR from solution.
  Bioresource Technology 06/2008; 99(8):2938-46. · 4.98 Impact Factor
• Article: Characterization and properties of iron oxide-coated zeolite as adsorbent for removal of copper(II) from solution in fixed bed column

  Runping Han, Lina Zou, Xin Zhao, Yanfang Xu, Feng Xu, Yinli Li, Yu Wang
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  ABSTRACT: A new composite adsorbent, iron oxide coated zeolite (IOCZ), was characterized and employed for the removal of Cu(II) from aqueous solution using fixed bed column. Scanning electron microscope (SEM), FTIR, X-ray diffraction spectrum (XRD) and BET analyses were used to study the surface properties of the coated layer. The effects of various experimental conditions, such as the flow rate, initial metal concentration and bed depth, were studied. The dynamics of the adsorption process were fitted by Adams–Bohart model and Thomas model. The Thomas model was found suitable for the description of breakthrough curve at all experimental conditions, while Adams–Bohart model was only for an initial part of dynamic behavior of the IOCZ column. The bed depth service time (BDST) model was applied to predict the service times with other flow rate and initial concentration. The theoretical breakthrough curve was compared with experimental breakthrough curve profile in the dynamic process. The saturated column was regenerated by 1 mol l−1 hydrogen chloride solution and IOCZ could be reused in Cu(II) removal.
  Chemical Engineering Journal.