Applied Mechanics and Materials Vols. 395-396

Abstract: The cytotoxicity of Desacetylcinobufotalin (DEBF) and apoptosis induced by DEBF was measured. Additionally the mechanism of Apoptosis induced by DEBF was studied through Western blot. The results show DEBF displayed the marked inhibition effect to HepG2 cells and the IC₅₀ value is 0.0279μmol/ml. The expression of Bax was significantly increased and the expression of Bcl-2 was markedly decreased, compared to the control. The data suggest DEBF had significant antitumor activity through induction apoptosis via mitochondria pathway.

Abstract: The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment. The results show the optimum adsorption time is 100 min, the best adsorption temperature is 50 °C, and pH value is 10. When the concentration of cesium ions is 160 mg/L, the adsorption capacity can be up to 9.217 mg/g.

Abstract: In this study, a new catalytic oxidation technology, microwave/Fe₃O₄ system, was used to treat volatile organic carbons (VOCs) and dichloromethane (DCM) was selected to simulate industrial emissions of VOCs. This system comprises a household microwave oven modified as the reaction chamber, which was fitted with a vertical, cylindrical quartz reactor comprising a catalytic packed column filled with granular Fe₃O₄, a microwave catalyst of iron (II, III) oxide. Experimental results showed that the destruction and removal efficiency (DRE) of DCM by microwave alone was close to zero, but with the microwave/Fe₃O₄ system, the temperature of the catalytic packed column increased rapidly and reached thermal balance within 10-15 min. Analysis of the rear gas after combustion showed that most of DCM was thermal oxidized into CO₂ and H₂O. The successful application of the proposed microwave/Fe₃O₄ system to thermal destruction of DCM promises a new technology for treatment of VOCs.

Abstract: Objective: Optimizing the extraction of total alkaloids from Caulophyllum robustum. Methods: The taspine which is a type of alkaloids of Caulophyllum robustum is selected as the target index. First, developing the HPLC analysis protocol; second, using orthogonal design method to optimize the hydrochloric acid leaching protocol; third, using cation exchange column to isolate the alkaloids and examining the optimal conditions. Results: the optimal conditions of hydrochloric acid leaching protocol is using 7 column volume of 1% hydrochloric acid for 3 times. The materials are loaded onto the LSD001 cation exchange column with optimal pH 4 and flowrate 2ml/mL, the elution buffer is 10 column volume 5% hydrochloric acid. After desalting, the yield of alkaloids is 1.35% which includes 6.83% of taspine.

Abstract: In this work, one activated carbon (AC) was modified with H₂O₂, (NH₄)₂S₂O₈ saturated solution and H₂SO₄/(NH₄)₂S₂O₈ mixture respectively. The oxygen groups on ACs surface were characterized by Boehm titration. The textures of the ACs were investigated by N₂ adsorption at 77 K. The influence of surface oxygen groups on methane adsorption on ACs has been studied. The results of Boehm titration showed that the concentration of acidic oxygen functional groups on the AC surface increased after modification. N₂ adsorption data showed that the specific surface area S_BET and the micropore volume V_mic of AC were changed lightly after modification. It was observed that there was, in general, a positive correlation between the methane saturated adsorption capacity and the S_BET of ACs while a negative correlation between methane saturated adsorption capacity and the total surface acidic groups. The methane saturated adsorption capacity was determined by the ACs surface chemistry when the microporosity parameters of two samples were similar. AC with a higher amount of oxygen surface groups, and consequently with a less hydrophobic character, had lower methane adsorption capacity.

Abstract: Amine-functionalized mesporous silicas ((referred as NH₂MS)) were synthesized by grafting with ethylenediamine. The obtained materials have been characterized by N₂ adsorption desorption measurement (BET). Adsorption behaviors of the adsorbent for lead (containing effects factors, kinetics, isotherms, thermodynamics) were investigated. The result indicated that the obtained particles possessed mesoporous structrure. The Pb (II) adsorption isotherm and kinetic data fit Freundlich model and the pseudo second-order kinetic model respectively. the adsorption of Pb (II) onto NH₂-MS was an enothermic nature.

Abstract: Organics in laboratory wastewater were treated by ultrasonic/Fenton method. COD degradation of laboratory wastewater was studied, which was affected by some factors such as ultrasonic frequency, ultrasonic power, the dosage of H₂O₂ and Fe²⁺, and the initial pH. Orthogonal experiment was carried out. The results of degradation by ultrasonic/Fenton method were compared with those results when ultrasonic or Fenton was used to degrade organics respectively. The results show that ultrasonic/Fenton can effectively degrade the organic pollutants in laboratory wastewater, and the degradation efficiency is higher than that of each process alone. The optimal conditions are as follows: frequency is 45kHz, power is 120W, the concentration of H₂O₂ is 0.71mmol/L, the concentration of Fe²⁺ is 0.03mmol/L and pH is 3 in the experiment when COD of 50mL laboratory wastewater is 21972mg/L.

Abstract: In this paper, the quality evaluation indexes of cellulose ether (CE) modified dry-mixed mortar are proposed by the comparison of properties of contrast mortar. The technical indexes of CE modified mortar include water retention, anti-sliding value, time difference of final set and the tensile bond strength ratio which give a good guidance for the application effect evaluation of cellulose used in dry-mixed mortar.

Abstract: The effect of soil water stress on the physiology of Sophora japonica Golden stem was studied in order to reduce the irrigation water. The results showed that the growths of the plants were suppressed after treated with flooding for 15 days, which was embodied in the decreasing of qP, ETR, Fv/Fm and the content of pigment, the increasing of the content of MDA and qN. The growth and appearance of plants were suppressed after flooded for 23 days. The drought stress suppressed the growth of plants, which was embodied in the decreasing of qP, ETR, Fv/Fm, the content of pigment, the water content of leaves, the increasing of the content of MDA, qN after treated for 19 days. The qP, ETR, content of pigment were increased after treated with slight drought or middle drought for 19 days. The best irrigation method for Sophora japonica Golden stemin the landscape land was the content of water in the soil between 18% and 30%, which did not affect the growth or landscape effects. The application of S. japonica Golden stem in the landscape and architecture should be avoided in the place which would be flooded for more than 15 days

Abstract: With the rapid increasing happening frequency of red tide in China, the urgent pollution issue of paralytic shellfish poisoning (PSP) toxins in aquatic products is becoming more serious and attacking greater attention. Thus, the routine monitoring of PSP toxins in aquatic products need to be vigorously enforced. In this study, the LC-MS-MS method for eight PSP toxins was developed and applied for the quantitative analysis in sea foods from different areas of China. The result showed the proposed method can completely meet the need for their routine monitoring purpose.