Papers by Author: Xian She Feng

Abstract: One of the major toxicants for living things is copper which consists of ions form in most of the manufacturing wastewater treatment. The drain water before releasing it into the water source is desired to eliminate copper ions (Cu²⁺) by using adsorption. The bio-wastes as adsorbents applied in this work, such as a dried pineapple pulp (DPP), chitosan flake (CTS), and chitosan spray coating on dried pineapple pulp (CPP) have a surface area of about 45.34, 60.02, and 70.01 m²/g, respectively. The effective Cu²⁺ eliminated efficiency and adsorption capacity from the copper (II) sulfate in aqueous solution was high with the high surface area. At optimum operating conditions, i.e., initial feed concentration 250 mg/L, pH 6.0, temperature 30 °C, and adsorption time 1 h, the Cu²⁺ eliminated efficiency in the percentage of DPP, CTS, and, CCP was 63.89, 80.83 and 86.92%, respectively, and adsorption capacity was 31.95, 40.22 and 43.46 mg/g, respectively.

Abstract: Dried pulp waste, a manufactured solid waste by product was used as a biosorbent for the removal zinc (II) from aqueous solution. A series of experiments were conducted in a batch system to evaluate the thermodynamic parameters of the pulp waste for zinc (II) removal at an initial pH value of 6.0, ZnCl₂ concentration of 50-200 ppm and temperature 30-50 °C. Thermodynamic parameters, such as Gibbs free energy change (ΔG°), enthalpy (ΔH°) and entropy (ΔS°), evaluation of zinc (II) adsorption on pulp waste showed that the adsorption process under the selected conditions was spontaneous and endothermic nature for all concentration and temperature studied. The activation energy of zinc (II) adsorption (E_a) was determined using modified Arrhenius equation as 1.89, 3.76, 4.73 and 6.46 kJ/mol at different concentration 50, 100, 150 and 200 ppm, respectively. The sticking probability (SP*) was also evaluated.

Abstract: Artificial lung also called as oxygenator which performs a function of exchanging O2 and removing CO2 from blood. Due to its good performance at the exchange area, oxygenation, etc, hollow fiber membranes have become the main research direction of artificial lung. Polypropylene (pp) hollow fiber membranes made by the melt-spinning and cold-stretching methods (MSCS) in this study. Through the research on the membrane manufacture process and technology optimization to prepare suitable membrane for artificially lung. The performance of membrane was affected by the melt-draw ratio and spinning temperature, annealing temperature, and the proportional relations of cold stretch with hot stretch. The results of the study show that improve melt-draw ratio, select the appropriate annealing conditions and the reasonable ratio of hot stretch with cold stretch can effectively increase the air flux of pp hollow fiber membrane.