Advanced Materials Research Vol. 800

Abstract: This article of mine water as the research object, using different coagulants (PAC, FC, AC) and coagulation tests of the mine water, to determine the removal of turbidity and organic matter most good coagulant PAC. Determine the optimal dosage of 16 mg / l, the mine water effluent turbidity removal efficiency of more than 90%, chemical oxygen demand COD_Cr removal rate reached more than 60%.

Abstract: Pd catalysts and Ce_0.5Zr_0.5O₂ mixed oxides (CZ) was prepared by co-precipitation technique and their physicochemical properties were characterized by specific surface area measurements (BET), scanning electron microscope (SEM), and X-ray diffraction (XRD) techniques. CeO₂-ZrO₂ solid solutions supported with Pd are investigated as catalysts for reduction of NO. The research presented in this paper is focused on the intrinsic structure of CeO₂-ZrO₂ solid solution and catalytic behavior of NO over Pd/Ce_0.5Zr_0.5O₂ mixed oxides catalyst. The incorporation of ZrO₂ into the CeO₂ framework strongly promotes the reduction of Ce⁴⁺ in the bulk of the support. The surface area of Ce_0.5Zr_0.5O₂ was 32 m²/g after calcination in air at 1000 °C for 5 h. XRD results revealed the existence of Zr-rich phase in CZ sample. The experimental results show that the best Pd/Ce_0.5Zr_0.5O₂ catalyst yielded 97.75% NO conversion at typical reaction temperatures (280-320 C) and the high gas hourly space velocity of 15,000 h¹. The effect of the calcination temperature was also investigated, and the optimal calcination temperature was 400-500 C.

Abstract: Phenol was selected as the target contaminant and the simulant phenol contaminated soil was treated with Potassium Ferrate Oxidation Method in Chemical leaking accidents. Potassium ferrate is very suitable for disposing the refractory toxic organic in the contaminated soil in a short time, and with no secondary pollution on the environment. When the reaction time was 10min in the oscillating condition; initial system pH 5.0~9.0 (adjusted by 2% sulfuric acid); potassium ferrate dosage was 25mg^.ml^-1; potassium ferrate was added into the reactor in batches and pH was adjusted to neutral, the degradation efficiency of phenol reached up to 95% and the whole reaction process was done in 10 min.

Abstract: The application of effect in substitute salt DT in the low-salt dyeing of reactive dyes on cotton fabric is discussed in the research. The optimum content of DT is measured by analyzing the degree of color-fixation, K/S value etc. Compared with the traditional treatment using the agent of sodium sulfate, adding substitute salt DT in reactive dyeing is more degradable and eco-friendly to the nature.

Abstract: A phosphate-based ionic liquid, 1-ethyl-3-methylimidazolium diethylphosphate ([EMI[DE), was synthesized and used to dissolve sugarcane bagasse cellulose under microwave radiation. The original and regenerated cellulose were both characterized by X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The results showed that cellulose had a more porous and less crystalline structure after regeneration, whereas chemical composition had no change. Thermal stability of the regenerated cellulose was somewhat lower, corresponding to the decreased crystallinity. In short, the treatment with [EMI[DE led to desirable structural modification on sugarcane bagasse cellulose via physical process. This is of great benefit to the subsequent downstream processes, such as enzymatic hydrolysis and ethanol fermentation.

Abstract: As an air pollutant, the emission and monitoring of SO₂ gas have been widely concerned. In the paper, the characteristics of domestic and imported portable SO₂ gas analyzers based on nondispersive infrared (NDIR) absorption technique have been tested. The performance of the analyzers has been discussed detailedly. The results reveal that domestic portable SO₂ gas analyzer can provide excellent performance like imported instrument. In additon, all the analyzers have been in comparison with the continuous emission monitoring system (CEMS) for monitoring the SO₂ emission of a power plant. The results demonstrate that domestic portable SO₂ gas analyzers can be used to evaluate and supervise CEMS operating situation. Based on the comparison results and domestic demand, we also give some suggestion for the future technique research and instrument development.

Abstract: Along with the rapid development of China and its eye-catching economic take-off, industrial production has brought about increasingly enormous negative impact. Industrial residues (coal ash, iron-ore slag, phosphorous slag and ganister sand) have accumulated in large quantities, thus severely contaminating the environment and greatly restricting the sustainable economic development. This paper conducts research on microstructure of the industrial wastes that are massively applied in domestic architectural material industry, such as coal ash, (S95S105) slag powder, S75 phosphorous slag, micro-bead (ultra-fine coal ash) and the micro ganister sand so as to analyze its size distribution and particle appearance and introduce its functions and effect in concrete and other cement products.

Abstract: The iron-rich schorl was took as the research objects in this paper and the high temperature phases transformation of the schorl were discussed. The preparation and infrared properties of the schorl glaze, of what is the melting temperature lower than 800°Cwere studied and also the law of improving water quality by the schorl glaze were tested and analyzed. The results showed that the schorl can be decomposed into mullite and iron oxide when the temperature higher than 800°C; the far-infrared emissivity of the glaze prepared by the schorl mixed with more than 40wt% low temperature frit reached 0.885; the property of schorl glaze is weaker than the material supported on porous ceramics modified by schorl in improving water quality (pH value).

Abstract: Based on the chemical mass balance (CMB) model, the heavy metals deposited in the bottom sediment of Hongfeng Lake were mainly apportioned to Houliu River and Maiweng River. The results of source apportionment of heavy metals enriched by man-made effluents showed that H_g was from the estuary area of Maiweng River; T_i and A_s pollutants were mainly from Maiweng River and Houliu River. The concentration of C_d was significantly impacted by its surrounding land use types because of its limited transportation distance.

Abstract: Mercury in the flue gas in coal-fired power plant as the research object using halogen compound as the modified material, the fly ash was modified by chemical immersion method，Study on adsorption agent, the adsorption temperature, modified material and loading on mercury adsorption of flue gas in coal-fired power plants. Experiments showed that, iodine adsorption properties of modified fly ash was the most significant, with the increase of the sorbent dosage, Hg removal efficiency increased, fly ash adsorption amount of change was not obvious, between 80-140°C temperature range, fly ash on mercury existed mainly physical adsorption, the mercury removal efficiency decreased with the increase of temperature, chemical adsorption occurred at 160°C, mercury removal efficiency increased.