Applied Mechanics and Materials Vol. 700

Abstract: Biotrickling filter (BTF) inoculated with Ralstonniapickettii L2 was established to treat waste gas containing chlorobenzene (CB). Results revealed BTF could achieve more than 80% removal efficiency of CB under the conditions of <0.6 g·m^-3 inlet concentration and >30 s empty bed residence time (EBRT). The mass ratio of carbon dioxide produced to the mixture of benzene, toluene, and oxylene (BTo-X) removed was approximately 2.10, indicating that 89.5% mineralization of the incoming CB vapor. The degradation of CB in the BTF followed Michaelis-Menten kinetic model, and the maximum specific degradation rate (rmax) was 76.3g·m^-3·h^-1. AWCD values indicated that the microganisms in the BTF showed the high microbial metabolic activities. Real-time PCR indicated that Ralstoniapickettii L2 could still maintain its stability andactivity in the BTF under different conditions.

Abstract: To reduce costs and obtain excellent performance, acrylic modified lignin sulfonate instead of butyl methacrylate stearyl methacrylate was prepared to oil absorption resin. And 1, 4-butylene glycol dimethacrylate as a crosslinking agent, 2,2’-azo-bis-(2-methylpropionitrile) as the initiator, with butyl acrylate to product the high lignin oil-absorbing resin, selected the best scheme for preparing by the orthogonal method, and the different concentrations of lignin and the best resin properties determined by SEM and its oil absorption test. Experimental results show that the resin has the high oil absorption properties,the maximum absorption of 20 times, and the suction speed is fast that 90min to reach saturation; It also has other characteristics,such as inexpensive cost, lightweight, easy recycling and disposal, reusable and so on.

Abstract: Cu/H-Sep and Cu-Fe/H-Sep samples were prepared by the incipient wetness impregnation method. These catalysts were characterized by means of XRF, XRD, BET, XPS, and H₂-TPR techniques, and their catalytic activities were performed by the SCR of NO with propylene. The results show that the Cu-Fe/H-Sep catalyst exhibited the best performance in the C₃H₆-SCR of NO. After investigation by H₂-TPR, XRD and XPS, the result showed that the higher reducibility, more amount of isolated Cu²⁺, higher dispersion of copper species, and stronger metal-support interaction were responsible for the excellent catalytic activity of Cu-Fe/H-Sep.

Abstract: The sisal cellulose was dissolved in ILs under optimal conditions of 150°C and 400W. The structure of sisal cellulose was changed from cellulose I to cellulose II, accompanied with the decrease of crystallinity through XRD, FT-IR analysis. According to the result of GPC, molecular weight distribution became more uniformly and narrow. This is because intra-and inter-hydrogen bond existed in cellulose were destroyed during the dissolution process in ILs. And the regenerated cellulose possessed better properties than the former, which could broaden the application fields of natural cellulose.

Abstract: The article mainly regards the soil of sugarcane fields in Guangxi as the research object. The study will discuss the changes of the sugarcane soil after vinasse application, including physical and chemical properties of soil, heavy metals content, soil microorganism and soil enzyme activities. The results showed that, vinasse application can reduce soil pH, improve the total N,P,K content; decrease the soil heavy metals, showing a significant impact on Cd. In addition, the influences to the number of culturable bacteria in the soil were more obvious than to the number of fungi and actinomycetes. And the activity of invertase in soil was also improved, which was advantaged of the carbon cycle in the soil. In short, vinasse can be used as a kind of liquid fertilizer to improve soil fertility and protect micro ecological environment of the soil.

Abstract: The effects of a solid waste containing Cr (VI) (SWCC) detoxified with orange peel (OP) and pineapple peel (PP) on the development of seeds were investigated. The results show that PP does better than OP. In the composites of PP, SWCC and soils, all the tested seeds (peanut, maize, green Chinese cabbage, soybean and garlic) grow if SWCC content is lower than 10%. The seeds, however, indicated variant resistance to SWCC, and garlic behaved best. It is possible to grow vegetables or plants with the composites of biomass, SWCC and soils, but it is also necessary to optimize the proportions for each of the kinds.

Abstract: Three activated carbon fibers, namely Sample A, B, and C, were used as electrodes for Ca²⁺ removal by capacitive deionization in this study. The physical properties of ACFs were comprehensively investigated with regard to surface area, pore volume, pore size distribution, specific capacitance, and contact angle. An internal correlation was intended to reveal between the ACF properties and their CDI performance. Pseduo-first-order adsorption kinetics model could successfully depict the Ca²⁺ removal with different ACF electrodes. Based on the fitting parameters, Sample B with the highest pore volume, specific capacitance, and hydrophilicity exhibited the highest equilibrium electrosorption capacity (9.977 mg-Ca²⁺/g-ACF). However, Sample A with the highest average pore diameter (2.4 nm) has the highest rate constant (0.074/min). Even though the abundant micropores with diameters less than 2 nm created large specific surface area in Sample C, its uptake of Ca²⁺ was not as good as that of Sample A.

Abstract: Mesoporous chitosan-silica composite sorbent has been successfully synthesized by a simple and facile template-free hydrolyzing route from single cheap silica precursor of sodium silicate. The overall decolorization efficiency and capacity for sugar juice between pure chitosan and composite sorbent are very close in field pilot-scale, while much lower quantity of chitosan (only 10 wt.%) is used to build the composite sorbent. The success of increased purification performance and sorption capacity of sugar juice is ascribed to the appropriate pore structure of the composite sorbent with high surface area (395 m²/g), large pore size (7.73×10^-9 m) and high percentage of accessible free amine groups of chitosan (70 %).

Abstract: Alumina microfiltration membrane was prepared with solid particle sintering method by changing the content of TiO2. The membrane flux, rejection to PEG10000 and rupture strength were tested. The results showed that: when the firing temperature is 1400°C, PVA is 2%, TiO2 is 1%, alumina microfiltration membrane flux reached 1.93m3/m2·h, PEG10000 retention rate is 13.5%, and the flexural strength is 74.38MPa.

Abstract: The paper expounded theoretically the requirements for choosing the auxiliaries in wine corks bleaching with hydrogen peroxide. Then, the analysis to the imported auxiliary CATALOR was described by chemical and instrumental means. In the end, ammonium bicarbonate was selected as the bleaching auxiliary according to the results both theoretical and experimental analysis, and its application process parameters were proposed.