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Evaluation and modeling of methyl green adsorption from aqueous solutions using loofah fibers
Xiaonan Tang,Yueyun Li,Runhai Chen,Fanlian Min,Juanjuan Yang,Yunhui Dong 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Loofah fiber, an economical adsorbent material, was first developed for the methyl green (MG) removalfrom aqueous solutions. The loofah fibers were characterized by SEM, FTIR, N2-BET and the potentiometric titration. The pH, contact time and temperature were examined extensively. The adsorption of MG on loofah fiber increasedvery quickly in the pH range 3.0 to 7.0, remaining a high level at pH>7.0. The kinetics of adsorption of MG on theloofah fiber was proved to coincide with pseudo-second-order kinetic models (r2>0.99) very well. Langmuir isothermwas demonstrated to fit the experimental data better than Freundlich isotherm model. Monolayer adsorption capacityincreased with the increase of temperature. Thermodynamic constants were evaluated, and the results indicated thatMG adsorption onto loofah fiber was feasible, spontaneous and endothermic. The high removal efficiency of MG onloofah fiber suggested that the loofah fiber was suitable material in MG pollution cleanup.
Stability criterion and its calculation for sail-assisted ship
Yihuai Hu,Juanjuan Tang,Shuye Xue,Shewen Liu 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
Stability criterion and its calculation are the crucial issue in the application of sail-assisted ship. However, there is at present no specific criterion and computational methods for the stability of sail-assisted ship. Based on the stability requirements for seagoing ships, the stability criterion of the sail-assisted ships is suggested in this paper. Furthermore, how to calculate the parameters and determine some specific coefficients for the ship stability calculation, as well as how to redraw stability curve are also discussed in this paper. Finally, to give an illustration, the proposed method is applied on a sail assisted-ship model with comments and recommendations for improvement.
Stability criterion and its calculation for sail-assisted ship
Hu, Yihuai,Tang, Juanjuan,Xue, Shuye,Liu, Shewen The Society of Naval Architects of Korea 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
Stability criterion and its calculation are the crucial issue in the application of sail-assisted ship. However, there is at present no specific criterion and computational methods for the stability of sail-assisted ship. Based on the stability requirements for seagoing ships, the stability criterion of the sail-assisted ships is suggested in this paper. Furthermore, how to calculate the parameters and determine some specific coefficients for the ship stability calculation, as well as how to redraw stability curve are also discussed in this paper. Finally, to give an illustration, the proposed method is applied on a sail assisted-ship model with comments and recommendations for improvement.