响应曲面法分析零价铁对普施安蓝H-5R脱色的影响因素

该文分别从零价铁（zVI）投加量、粒径、pH值、盐浓度、摇床摇速对偶氮染料普施安蓝H-5R进行脱色速率研究,并通过响应曲面进行试验优化。结果表明在初始染料溶液浓度为200mg／L时,最适投加量为1．5g／L,脱色速率随着粒径和摇床摇速增大而升高,中性和偏酸条件下pH影响不大,高浓度盐可以增加染料的脱色。响应曲面法（RSM）结果还表明不同影响因素之间存在相互作用,从而影响染料脱色。     

钙钛矿SrNiO3光催化降解染料的研究

用柠檬酸络合法制备钙钛矿型复合氧化物SrNiO3,并以其为光催化剂对水溶性染料进行光催化降解实验.讨论了光催化反应时间、催化剂投加量、光照强度、pH值、以及外加氧化剂(H2O2)等因素对光催化活性的影响.实验结果表明:在催化剂投加量0.4 g,降解时间180min,pH值为2,光照强度200 W,H2O2的投加量5 mL时,大红染料的降解率可达99.47%.     

联吡啶铁树脂相可见光光催化剂降解甲基紫性能的研究

采用将氮配位的联吡啶铁键合到商品树脂上的方法,制备联吡啶铁树脂相可见光仿生光催化剂。以太阳光作光源,以甲基紫溶液的脱色为模型反应,研究联吡啶铁树脂相可见光光催化剂的光催化脱色性能,考察了pH值、温度、光照、H2O2用量、催化剂投加量等因素对降解率的影响。     

含钛炉渣制光催化剂催化降解罗丹明B废水的研究

用含钛炉渣制备了光催化剂GN,通过催化降解罗丹明B废水,分析了催化剂投加量,废水pH值等因素对脱色率的影响.实验结果表明:催化剂GN具有较高的光催化活性,选取适当的催化剂投加量以及合适的废水pH值有助于罗丹明B的降解,GN最佳投加量为0.25g·L-1,适宜的废水pH值为2.当罗丹明B废水浓度为25mg·L-1时,在最佳条件下,光催化反应1h后,罗丹明B废水的降解率达95％以上.     

纳米TiO2薄膜对活性深蓝ST-2GLN染料的光催化降解研究

采用溶胶-凝胶（Sol—Gel）法,以钛酸正丁酯为前驱体,以不锈钢表面为基底,用提拉法镀膜,在400℃下高温煅烧2h．制备出纳米TiO,薄膜光催化剂。在以波长为254nm、8W的紫外灯为光源、光源到溶液的距离为2cm的条件下。对活性深蓝ST-2GLN模拟染料废水进行光催化降解试验。探讨了光照时间、初始质量浓度、TiO2提拉层数、初始pH值和H2O2的投加量等因素对脱色率的影响。结果表明：初始质量浓度为80mg／L、TiO2提拉层数为4层、pH值为7．0的条件下,H2O2（30％）的投加量为3．0mL,经2h的光照,脱色率达到87％。光催化降解活性深蓝ST-2GLN染料的动力学研究表明．其降解过程是一个一级反应过程,反应速率常数为0．0132min一。     

石墨烯/TiO_2-CeO_2催化剂的制备和光催化氧化法处理染料废水

采用溶胶凝胶和水热法制备的石墨烯/TiO2-CeO2催化剂光催化氧化处理染料废水活性艳红X-3B,结果表明掺杂Ce和石墨烯的TiO2比纯的TiO2光催化效果更高,当石墨烯负载量为2.5%,Ce的掺杂量4%时,催化剂的催化效果最佳,在此条件下考察了催化剂的投加量、染料初始pH以及光照时间对活性艳红X-3B的降解效果的影响,得出催化剂的最佳投加量为0.05g,初始pH为4,光照时间时间为3h,废水脱色率可达99.15%。     

AgCl光催化降解活性艳红K-2BP染料的研究

以300W高压汞灯为光源,研究了AgCl对染料废水进行光催化氧化的可行性,以及溶液初始pH值、催化剂的投加量和光照时间等因素对光降解反应的影响.结果表明,在实验条件下,AgCl对活性艳红K-2BP染料有明显的降解效果.AgCl在光照条件下使有机物分解,酸性条件比碱性条件有利于活性艳红的降解,当催化剂用量为0.5 mmol/L时,10 min光照,染料废水降解率达69.9%.     

PW_(12)/PANI/ZnO复合材料光催化降解亚甲基蓝

以PW12/PANI/ZnO为光催化剂。在紫外灯辐射下,研究了模拟染料废水亚甲基蓝溶液的光催化降解的反应,讨论了催化剂投加量、染料浓度、溶液的pH值对亚甲基蓝降解率的影响。结果表明,亚甲基蓝溶液光催化降解的最佳条件为:pH=3,催化剂投加量为0.012 5 g,染料浓度为5 mg/L,经30 W紫外灯照射90 min后,其降解率为85.84%。     

SnWO4/g-C3N4复合光催化剂降解亚甲基蓝溶液

采用溶剂热法制备SnWO_4/g-C_3N_4复合光催化剂,在可见光降解亚甲基蓝实验中研究复合催化剂的光催化性能。考察催化剂投加量、亚甲基蓝溶液初始浓度、溶液pH值、盐效应对光催化性能的影响及SnWO_4/g-C_3N_4复合光催化剂的重复利用性。实验结果表明,在催化剂投加量1.0 g·L~(-1)、亚甲基蓝溶液初始浓度15 mg·L~(-1)和溶液pH值7.08时,在可见光条件下反应3 h,亚甲基蓝溶液脱色率达到94.2%;NaCl对光催化降解亚甲基蓝具有抑制作用,加入10 mmol·L~(-1)的NaCl溶液后亚甲基蓝的脱色率降为76.0%;复合光催化剂循环使用5次后,暗吸附后光照3 h,亚甲基蓝溶液的总脱色率仍可达到78.7%,重复利用性良好。     

纳米TiO2光催化降解直接冻黄染料的研究

以纳米TiO2作为光催化剂,紫外灯为光源,对印染废水中的直接冻黄G染料进行了光催化降解实验.讨论了COD的初始浓度、光照时间、纳米TiO2投加量、初始pH值和外加催化剂Fe3＋的用量等五个因素对COD和色度去除率的影响.正交实验结果表明：初始pH值和光照时间是影响光催化氧化反应的关键因素;在初始COD为144.67mg/L、Fe3＋投加量为6.72mg/L、纳米TiO2投加量为100mg/mL、pH6的条件下,经6h的照射,COD的去除率达到80%,色度的去除率达到98.5%.     

Green catalysts for Fenton-like oxidation of Procion Red MX-5B: Influence of the activation method and the reaction parameters on dye removal

The catalytic activities of the iron catalysts over activated carbon supports prepared by different activation methods in the heterogeneous Fenton-like oxidation of Procion Red MX-5B were investigated. The activated carbons were prepared from walnut shells by applying physical and three chemical activation methods, including HNO₃, ZnCl₂, and KOH activations to obtain various catalyst supports. KOH-activated carbon catalyst was assessed to be the most efficient one. Under the optimum reaction conditions, 47.5% COD removal, 51.6% degradation, and 91.6% decolorization efficiencies were achieved in the presence of this catalyst. In the kinetic study, the activation energy was evaluated as 47.36 kJ/mol.     

The effect of dyes and dyeing on the mechanical properties of polymeric materials

The effect of reactive and disperse dyes and dyeing on the mechanical properties of cotton and polyester fibers, respectively, has been studied. It is observed that reactive dye (Procion Brilliant Red MX-2B) and disperse dye (Dispersol Red B-2B) caused a decrease in the tensile strength of the fiber which was often accompained by a decrease in the extensibility and general improvement in the tensile stiffness of the fibers. A linear relationship exists between percent disperse dye on the fiber and the square root of time of dyeing for poly(ethylene terephthalate) fibers in the initial region of dye uptake.     

Experimental Study on Photocatalytic Activity of Cu2O/Cu Nanocomposites Under Visible Light

Cu₂O/Cu nanocomposites (NCs) are synthesized using a two-step hydrothermal method, their different phase compositions are obtained by adjusting the reaction time, and then, they are used as photocatalysts to degrade dye Procion Red MX-5B (PR), methylene blue (MB) and methyl orange (MO) under visible-light. Experimental results indicate Cu₂O/Cu NCs exhibit a much higher photocatalytic activity than pure Cu₂O, they remain almost unchanged in their phase compositions in the long photocatalytic reaction process, except for partial oxidation of particle surface. They still exhibit a high photocatalytic activity even at the end of four photocatalytic reaction cycles. It can therefore be concluded that Cu₂O/Cu nanocomposites are good candidates for processing of pollutant water.     

响应面法优化碱催化酯交换反应制备生物柴油工艺研究

根据中心组合试验设计原理，通过30个试验，其中有6个样本的中心点，以甲酯含量作为响应值。考察反应时间、催化剂用量、反应温度和醇油摩尔比对碱催化酯交换反应的影响，确定碱催化酯交换反应制备生物柴油的二阶多项式模型。试验结果很好地拟合模型及对99％以上的差异做了解释，优化工艺参数的反应时间为45min、催化剂用量为1．5％、反应温度50℃、醇油摩尔比为7．5，试验值在95％的置信区间符合预测值。结果表明，RSM优化的模型适合于碱催化酯交换反应制备生物柴油工艺，能够预测不同条件下碱催化酯交换反应得到甲酯含量。     

Porous epoxies by reaction induced phase separation of removable alcohols: Control of spheroidal pore size by mass fraction,cure temperature,and reaction rate

The mechanical behavior of acrylonitrile butadiene rubber (NBR) – organo modified layered silicate was modeled using Design of Experiments (DoE). Response surface methodology (RSM), a DoE tool was used to optimize the formulations for optimal performance of the nanocomposites. A Box‐Behnken design with three factors and three levels was used to model the relationship between mechanical properties and levels of ingredients. The factors studied for the design are silica content, nanoclay loading and vulcanization system. The nanocomposites were evaluated for tensile strength, modulus, elongation at break and hardness. The effect of heat aging on mechanical properties was also studied. The predicted properties of the nanocomposites are in good agreement with the experimental results, which confirmed the prognostic ability of response surface methodology. The model equations were used to generate response surfaces and contour plots to study the interaction between the variables. The contour plots were overlaid within the applied constraints to identify the required combination of variables that gives the optimum performance for the nanocomposites. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Dyeing of chemically modified cellulose. VII. Dyeability of cellulose bearing aromatic amino,nitro, and acrylamidomethyl groups

The effect of introducing aromatic amino, nitro, and acrylamidomethyl groups in the cellulose molecules on the dyeing properties of two direct dyes (Chlorantine Fast Red 6BLL and Solophenyl Orange T4RL) as well as two reactive dyes, (Procion Brilliant Red M5B and Procion Brilliant Orange MG) was investigated. The extent and rate of dyeing for cellulose bearing aromatic amino groups were lower than those of nonmodified cellulose irrespective of the dye used. In addition, the extent of dyeing decreased as the amount of aromatic amino groups increased. The opposite held true for cellulose bearing acrylamidomethyl groups, particularly with direct dyes where increasing these groups caused a substantial enhancement in the dye uptake. On the other hand, subjecting cellulose to nitration reaction prior to dyeing diminished significantly its dyeability with the dyes.     

Optimization of Rubber Wood Drying by Response Surface Method and Multiple Contour Plots

By adopting the central-composite experiment design, the response surface methodology was used to optimize operating conditions of rubber wood drying. The independent variables are initial moisture content of rubber wood, and three drying environment parameters namely, temperature, relative humidity, and air velocity. The investigating responses are final moisture content, drying time, and energy consumption. The restriction of the optimization is the designated final moisture content, which is not greater than 16%. The third-order polynomial models with transformed responses were developed from experiment data to generate 3-D response surfaces and contour plots. The analysis of variance (ANOVA) was performed to identify the significant parameters affecting the rubber wood drying. Drying temperature and holding relative humidity are those two influential operating parameters that significantly control the final moisture of rubber wood and affect the drying time and energy. The multiple contour plots of drying responses show that the optimum operating regions are located mainly at high temperature drying zone. The high temperature drying practice can save energy and drying time by 44 and 25% respectively, in comparison to the conventional temperature drying.     

Optimization of Rubber Wood Drying by Response Surface Method and Multiple Contour Plots

Abstract

By adopting the central-composite experiment design, the response surface methodology was used to optimize operating conditions of rubber wood drying. The independent variables are initial moisture content of rubber wood, and three drying environment parameters namely, temperature, relative humidity, and air velocity. The investigating responses are final moisture content, drying time, and energy consumption. The restriction of the optimization is the designated final moisture content, which is not greater than 16%. The third-order polynomial models with transformed responses were developed from experiment data to generate 3-D response surfaces and contour plots. The analysis of variance (ANOVA) was performed to identify the significant parameters affecting the rubber wood drying. Drying temperature and holding relative humidity are those two influential operating parameters that significantly control the final moisture of rubber wood and affect the drying time and energy. The multiple contour plots of drying responses show that the optimum operating regions are located mainly at high temperature drying zone. The high temperature drying practice can save energy and drying time by 44 and 25% respectively, in comparison to the conventional temperature drying.     

响应面法优化以重组大肠杆菌发酵生产类人胶原蛋白过程

In order to improve the production of human-like collagen Ⅲ (HLC Ⅲ) by fed-batch culture of recom-binant Escherichia coli BL21, the Plackett-Burman and Box-Behnken design were applied to optimize the fermen-tation process parameters.Three variables (induction time, inoculum age and pH), which have significant effects on HLC Ⅲ production, were selected from eight variables by Plackett-Burman design.With the regression coefficient analysis in the Box-Behnken design, a relationship between HLC Ⅲ production and three significant factors was obtained, and the optimum levels of the three variables were as follows: induction time 3.2h, inoculum age 12.6 h and pH 6.7.The 3D response surface plots and 2D contour plots created by the Box-Behnken design showed that the interaction between induction time and pH and that between innoculum age and pH were significant.An aver-age 9.68 g·L~(-1)HLC Ⅲ production was attained in the validation experiment under optimized condition, which was 80% higher than the yield of 5.36 g·L~(-1) before optimization.     

Derivative cathodic stripping voltammetry in the simultaneous determination of three textile dyes in aqueous solutions

Reactive dyes, such as Procion Yellow, Procion Red, and Procion Blue, were simultaneously determined in aqueous ternary solutions using derivative cathodic stripping voltammetry following adsorption on a hanging mercury drop electrode. An electrochemical cell containing Britton–Robinson buffer solution at pH 8 was used as the supporting electrolyte. The following experimental conditions were established: ?0.100 V deposition potential, 80 s deposition time, 50 mV pulse amplitude, 50 mV s^?1 scan rate, and 0.40 mm² maximum mercury drop size. A linear response was observed over the 0.630 × 10^?3 to 1.050, 1.441 × 10^?3 to 1.572, and 0.198 to 1.570 mg l^?1 ranges for Procion Yellow, Procion Red, and Procion Blue respectively. The detection limits were 0.210 × 10^?3, 0.480 × 10^?3, and 0.066 mg l^?1 respectively, with a relative standard deviation (n = 3) of 1.22%. The accuracy of the method was evaluated by derivative spectrophotometry, certifying the results as a function of proximity. All results were similar, indicating that derivative cathodic stripping voltammetry may be efficiently applied for the simultaneous determination of textile dyes in aqueous ternary solutions.