MnOx/TiO2催化剂催化燃烧去除废气中的正己烷

采用溶胶-凝胶法制备了MnOx/TiO2催化剂,考察了n(Mn):n(Ti)、催化剂载体、气体流量对催化燃烧去除废气中正己烷效果的影响.实验结果表明:随着n(Mn):n(Ti)的增加,正己烷去除率先增加后减小,气体流量减小正己烷去除率增大;当n (Mn):n(Ti)为7.85％、气体流量为100 mL/min时,在240℃时正己烷的去除率为90％,MnOx/TiO2催化活性最大;MnOx/TiO2的催化活性优于MnOx/SiO2;SEM和XRD表征结果表明,所制备的MnOx/TiO2是一种活性物种MnOx高度分散的纳米结构催化剂.     

以回用为目标的H/A/O组合污水处理工艺研究

应用H/A/O 组合工艺的一体化设备,对中等浓度的城市生活污水和低浓度火电厂生产废水进行处理,两者的CODCr去除率分别达到93.68%和73.60%.该法解决了传统工艺处理火电厂低浓度废水效果不佳的问题,适用于城市生活小区或中小型火电厂的污水处理.     

Composite Film Based on Whey Protein Isolate/Pectin/CuO Nanoparticles/Betanin Pigments; Investigation of Physicochemical Properties

Journal of Polymers and the Environment - The aim of this work was to preparation of edible films based on whey protein isolate/pectin (WPIP) that containing betanin pigments (BP) and copper (I)...     

瑞明电厂石灰石/石膏湿法脱硫技术分析

主要介绍了瑞明电厂石灰石／石膏湿法烟气脱硫(FGD)系统的主要设计参数及其工艺流程，并对调试和运行中发现的一些问题进行了分析和讨论。     

Annealing Effect on Pla/Eva Blends Performance

Journal of Polymers and the Environment - PLA has aroused industrial and scientific interest in recent years, mainly due to its biodegradable character. However, PLA is brittle and displays low...     

H_4SiW_(12)O_(40)/TiO_2/空心微珠光催化降解联苯胺

采用复合型光催化剂H_4SiW_(12)O_(40)/TiO_2/空心微珠(cenospheres)光催化降解联苯胺,考察了联苯胺降解效果的影响因素,并运用FTIR和GS-MS技术分析了联苯胺光催化降解过程的主要中间产物,探讨了联苯胺可能的降解路径。实验结果表明:以125 W中压汞灯为光源,在溶液pH为6.3,初始联苯胺质量浓度为10 mg/L的条件下光反应240 min,联苯胺降解率达78%,比Ti_O2/空心微珠提高了24百分点;H_4SiW_(12)O_(40)/TiO_2/空心微珠光催化降解联苯胺符合表观一级动力学特征,且反应速率常数随初始联苯胺质量浓度的增加而减小;H_4SiW_(12)O_(40)/TiO_2/空心微珠具有较好的稳定性,易于分离,可重复利用;联苯胺光催化降解过程的主要中间产物为4-氨基联苯、4-氨基苯酚、对苯二酚和1,4-苯醌。     

Influence of content and particle size of waste pet bottles on concrete behavior at different w/c ratios

The goal of this work was to study the mechanical behavior of concrete with recycled Polyethylene Therephtalate (PET), varying the water/cement ratio (0.50 and 0.60), PET content (10 and 20 vol%) and the particle size. Also, the influence of the thermal degradation of PET in the concrete was studied, when the blends were exposed to different temperatures (200, 400, 600 °C). Results indicate that PET-filled concrete, when volume proportion and particle size of PET increased, showed a decrease in compressive strength, splitting tensile strength, modulus of elasticity and ultrasonic pulse velocity; however, the water absorption increased. On the other hand, the flexural strength of concrete-PET when exposed to a heat source was strongly dependent on the temperature, water/cement ratio, as well as on the PET content and particle size. Moreover, the activation energy was affected by the temperature, PET particles location on the slabs and water/cement ratio.     

基于Mn-Ce/TiO2的低温选择性催化还原NO研究

采用浸渍法制备了Mn-Ce/TiO2催化剂,考察了不同Ce含量、温度、O2浓度、NH3/NO比对催化剂活性的影响。结果表明,Mn-Ce/TiO2催化剂具有较好的低温SCR活性。     

Investigation on Miscibility of Sodium Alginate/Pullulan Blends

Miscibility studies of Sodium alginate (NaAlg)/Pullulan have been carried out in different percentage of blend components. The ultrasonic velocity, viscosity, density and refractive index were measured at 30 and 40 °C. Further the blend films of NaAlg and Pullulan were prepared by solution casting method and characterized by differential scanning calorimetric (DSC), fourier transition infrared spectroscopic (FTIR), and scanning electron microscopic (SEM) methods. Using the viscosity data, interaction parameters were computed to determine the miscibility. The data suggest that the blend is miscible in the entire composition range. The change in temperature had no significant effect on the miscibility of NaAlg/Pullulan blends. The miscibility is confirmed by SEM, DSC, ultrasonic velocity, density, and refractive index methods. The specific interactions of hydrogen bonding type of the blends were investigated by FTIR.     

On the Curing of ESO/MTHPA/DEH 35 and ESO/MTHPA/DEH 35/TIN

Journal of Polymers and the Environment - Epoxidized soybean oil (ESO) compounds were cured with methyl tetrahydrophthalic anhydride (MTHPA) as hardener and 2,4,6-tris (dimethylaminomethyl) phenol...     

Mechanical and Physical Properties of Green Biocomposite Based on Medium Density Fiberboard Sanding Powder/Polyethylene/Nanoclay

Medium density fiberboard (MDF) sanding powder is an industrial waste that has not been yet used as a raw material to produce composites. In this study, the influence of nanoclay particles on the flexural and impact strengths and the withdrawal strength of green biocomposites (based on MDF sanding powder/polyethylene/nanoclay) were investigated. For this aim, medium density fiberboard sanding dust and polyethylene were used as the lignocellulosic and thermoplastic material, respectively. In addition, maleic anhydride grafted polyethylene was used in three weight percentages (0, 3 and 6 %) as a coupling agent and compatibilizer, and Cloisite^®15A was used in four weight percentages (0, 2, 4 and 6 %). To prepare samples, wood-plastic granules were produced by using a twin-screw extruder followed by the hot pressing method. The mechanical and physical properties were measured according to the CEN/TS15534:2007 and ASTM-D256 technical specifications. The results showed that the coupling agent improved the mechanical and physical properties of biocomposites; however, its effect might be affected by the nanoclay particles. Furthermore, the ultrastructure of the biocomposites was surveyed with SEM.     

Novel LLDPE/Cellulose Microfiber/Nanoclay Nanocomposites Based on In Situ Nanoclay Fabrication Simultaneously with Wastewater Treatment

Journal of Polymers and the Environment - This article presents a unique approach for paper wastewater treatment simultaneously with in-situ intercalating clay and using the cellulose fiber/in situ...     

有机钙硫氮协同控制技术研究

有机钙硫氮协同脱除技术是一种极具应用前景的污染物综合控制技术。分析了有机钙硫氮协同脱除的机理及影响因素,介绍了该技术在国内外的研究发展状况。     

Study on Biodegradable Starch/OMMT Nanocomposites for Packaging Applications

The thermoplastic starch (TPS) and nanocomposite(TPS/OMMT) was prepared with 15% carbamide, 15% ethanolamine and different contents of organic activated montmorillonite (OMMT) by twin-screw extruder with a 130 °C barrel temperature. Fourier transforms infrared spectroscopy and wide angle X-ray diffraction shown that the alkylamine in dodecyl benzyl dimethyl ammonium bromide could react with MMT via cation exchange reaction. After treated, the d(001)space distance of MMT increased from 1.5 to 1.7 nm. Scanning electron microscope revealed that the lower contents of OMMT could disperse well in the matrixes of TPS. The carbamide, ethanolamine and the OMMT could destroy the crystallization behavior of starch, but only the OMMT restrained this behavior for long-term storing. Mechanical properties investigation indicated that the tensile strength and modulus of TPS/OMMT nanocomposites were better than those of TPS, while the elongation at break was descended with the increasing of OMMT contents. When the content of OMMT was 4%, the tensile strength and modulus of TPS was improved from 4.2 and 42 MPa to 6.0 and 76 MPa, respectively.     

Biodegradable Nanocomposite Film Based on Gluten/Silica/Calcium Chloride: Physicochemical Properties and Bioactive Compounds Extraction Capacity

Journal of Polymers and the Environment - In this study, a biodegradable wheat gluten (WG) film containing calcium chloride and nano silica (WG/CaCl2/SiO2) was prepared and the physicochemical...     

A flexible environmental reuse/recycle policy based on economic strength

Environmental policies based on fixed recycling rates may lead to increased environmental impacts (e.g., landfilled wastes) during economic expansion. A rate policy is proposed, which is adjusted according to the overall strength or weakness of the economy, as reflected by overall packaging demand and consumption, production and imports-exports. During economic expansion featuring rising consumption, production or exports, the proposed flexible policy suggests a higher reuse/recycle rate. During economic slowdown a lower rate results in lower impacts. The flexible target rates are determined in terms of annual data, including consumption, imports-exports and production. Higher environmental gains can be achieved at lower cost if the flexible policy is applied to widely consumed packaging products and materials associated with low rates, or if cleaner recycling technology is adopted.     

UV/草酸铁络合物光解对硫磷的研究

研究了紫外光（UV）/草酸铁络合物对对硫磷的光解作用,结果表明,UV/草酸铁络合物能快速有效地光解对硫磷,且较UV/TiO2的光解效果好。对硫磷光解率随着其初始浓度的增加而降低;pH为3-5时其光解速率最快;[Fe(Ⅲ）]与[OX^2-]之比（OX^2-代表草酸根）和溶液中的溶解氧对其光解有显著影响。     

Nanocomposite Film Based on Gluten Modified with Heracleum persicum Essence/MgO/Polypyrrole: Investigation of Physicochemical and Electrical Properties

In this study, the wheat gluten film was prepared. Heracleum persicum essence, magnesium oxide nanoparticles and polypyrrole were used to modify the structure of the wheat gluten film. Physicochemical properties of the prepared films such as thickness, solubility, moisture absorption ability, antioxidant properties, and electrical conductivity of the films were investigated. Also, the mechanical, structural and thermal properties of the films were investigated by techniques such as SEM, FTIR, XRD, TGA, DTA and tissue analysis. SEM images showed that the essence and polypyrrole strengthened the gluten film structure and made it more resistant to the passage of gases. FTIR spectra confirmed the electrostatic interactions between gluten and essence and polypyrrole. XRD spectra showed the amorphous structure of gluten film and its composites. The results of thermal analysis showed that polypyrrole greatly increased the thermal resistance of the film and the nanoparticles had little effect on the thermal resistance. Thickness, solubility, moisture content and ability to absorb moisture were further affected by the essential oil. The antioxidant and electrical conductivity of the film was greatly increased in the presence of all three additives of essence, magnesium oxide nanoparticles and polypyrrole. The gluten–essence–MgO–PPy (Glu–E–MgO–PPy) composite film had the most antioxidant properties. Glu–E–MgO–PPy film with important electrical conductivity and antioxidant properties has the potential to be used as an active and intelligent film in the packaging of perishable food products.

     

Co、Ce共掺杂TiO2-SiO2/NiFe2O4磁性介孔微球的光催化性能

以NiFe2O4纳米粒子作磁性载体、十二烷基磺酸钠和聚乙烯吡咯烷酮作模板剂、Co和Ce作掺杂离子、钛酸丁酯作钛源,制备得到(Co,Ce)-TiO2-SiO2/NiFe2O4磁性介孔微球.通过震动样品磁场计、SEM、紫外-可见漫反射吸收光谱、程序升温氧脱附等方法对磁性介孔微球的结构和光吸收性质进行了表征.(Co,Ce)-TiO2-SiO2/NiFe2O4是具有中空结构和超顺磁性的介孔微球,初始吸收边明显向可见光区域拓宽,增强了在可见光区域的吸收和表面吸附氧浓度.实验结果表明,(Co,Ce)-TiO2-SiO2/NiFe2O4能有效地将氨基甲酸酯类化合物光催化降解成无毒的NH+4和NO-3无机产物等.