Advances in Environmental Technologies III

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Authors: Fu Chen Ban, Ya Ling Jiang, Xiao Tong Zhao, Xue Han
Abstract: To determine the reactive brilliant orange X-GN by CuO-CeO2/γ-Al2O3 optimum operating conditions.Under oxidizing conditions by CuO-CeO2/γ-Al2O3 that based on Box-Behnken Design,s response surface optimization analysis and establish model.The optimum operating conditions for cell voltage is 17.84V, pH is 7.0 ,concentration of electrolyte dosing is 966mg/L.Under this condition, the decolorization rate up to 95.5%,the impact of various factors on the size of decolorization rate is cell voltage>pH > concentration of electrolyte dosing ;the impact of the interaction between the factors various factors on the size of decolorization rate is cell voltage & pH value> cell voltage & concentration of electrolyte dosing>pH value & concentration of electrolyte dosing .
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Authors: Yan Ping Guo, Hui Lin
Abstract: The shake flask aerobic biodegradation experiment was used to study the effect on biodegradation of 17α-ethinylestradiol (EE2) in the sediment/water system affected by mono-rhamnolipid (RL-F1) and di-rhamnolipid (RL-F2). The results showed that RL-F1 and RL-F2 had no inhibitory effect on EE2 biodegradation. The effect of RL-F1 on enhanced biodegradation of EE2 was larger than that of RL-F2. In 6 mM and 10 mM of the rhamnolipidic functioned systems, EE2 biotransformation rates affected by RL-F1 were respectively 7.6 and 8.2 times of those of RL-F2 corresponding systems. The accumulation and change rule of the intermediate metabolites M.1 with the polarity greater than EE2 and M.3 with the polarity weaker then EE2 in the biodegradation process were analyzed. In the RL-F2 systems, the time for the accumulative amounts of M.1 and M.3 up to the peak was correspondingly lagged and their output was relatively lower. The testing result of rhamnolipids in the sample showed that RL-F1 was more biodegradable than RL-F2. The bioavailability of di-rhamnolipidic micelle solubilized with EE2 was inferior to that of mono-rhamnolipid, making the organic uptake and metabolism process of microorganisms slow down.
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Authors: Ping Ning, Lei Shi, Yue Hong Yang, Yang Cheng
Abstract: The removal of chromium (VI) ions from aqueous solution by microwave-modified phosphogypsum was studied. The removal capacity of microwave-modified phosphogypsum for chromium (VI) ions was examined as a function of solution pH, contact time, adsorbent dosage. Before a series of the adsorption studies, phosphogypsum was pre-conditioned with microwave. It was observed that the adsorption of the chromium (VI) ions onto the phosphogypsum in the pH range of 2 and 11. The chromium (VI) adsorption process was described with the Langmuir and Freundlich theories, and the Freundlich model indicated the best fit to the adsorption process. Maximum adsorption capacity of microwave-modified phosphogypsum was found to be 3.126 mg g1. The results proved that the microwave-modified phoshogypsum is a suitable adsorbent for the removal of chromium (VI) ions from aqueous solution.
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Authors: Xiao Jun Hu, Miao Miao He, Yu Shuang Li, Jing Feng, Qing Bian, Yan An Chen
Abstract: The contamination of copper to the environment is more and more serious.Nowadays,the sources of copper in the soil due to natural and human activity two kinds of sources, the former is derived from the rock and soil background value, while the latter is derived from the industrial “three wastes”. We can use soil washing for extracting contaminants from the contaminated soil and it is a possible remediation method. Natural organic acids seem to be hopeful environmentally friendly for removing toxic metals from soils. Batch soil-washing experiments were conducted to investigate the behavior of copper desorption from soils by dihydroxysuccinic acid.The experimental results show that the removal of copper with dihydroxysuccinic acid was highly dependented on the initial pH and the concentration of dihydroxysuccinic acid.When the pH was rapidly rising, the removal of copper declined sharply.On the contrary, copper desorption increased adding dihydroxysuccinic acid concentration. More than 80% copper was extracted from soil by 80 mmol L-1 dihydroxysuccinic acid.
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Authors: Bin Wu
Abstract: Additives addition into Mn-Ce/TiO2 which had good low-temperature catalytic properties was studied, so as to improve its low-temperature anti-poisoning performance. Results showed that catalytic activity of Mn-Ce/TiO2 added additives V, Fe and Cu (short for Mn-M-Ce/TiO2 ) was improved all, compared with 95% NO conversion efficiency of Mn-Ce/TiO2 at temperature of 120°C, the ratio of Mn-M-Ce/TiO2 reached nearly 100%. Mn-Fe-Ce/TiO2 had the best single anti-poisoning ability, under the existence of 7% vapor, its catalytic conversion efficiency could be always kept over 90% at 120°C.The anti-SO2 poisoning ability at low-temperature reduced after adding additives Fe and Cu. catalytic conversion efficiency of Mn-Fe-Ce/TiO2 and Mn-Cu-Ce/TiO2 could be close to 90% at temperature of 180°C when water and SO2 exist simultaneously.
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Authors: Ling Liu, Xiao Jun Zhang, Jian Zhou Liu
Abstract: A facile one-step solvothermal route was developed to synthesize NiO nanoflowers (200-300 nm in diameter) with the introduction of poly(vinyl-pyrrolidone)/stearic acid (PVP/SA) mixture. The product was characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopes (FESEM), Fourier transform infrared spectrometry (FT-IR), Thermal gravimetric analyze (TGA), and Brunauer-Emmett-Teller (BET). The mesoporous NiO nanoflowers showed an excellent adsorption capacity for organic pollutants (Congo red) from waste water (about 56 mg Congo red per g NiO).
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Authors: Qiang Wu, Ruo Bing Han, Peng Fei Chen
Abstract: Uniform immobilization of BiFeO3 on silica fiber was successfully obtained by a combined impregnation method with carbon nanofibers (CNFs) template route. The physicochemical properties of the obtained material were characterized by means of X-ray diffraction, field emission scanning electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. It turned out that BiFeO3 immobilized on silica fiber can exhibit visible light photocatalytic degradation of rhodamine B (RhB) to some extents. It is expected that such kind of material would possess many potential applications in photocatalysis.
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Authors: Da Mei Yu, Yun Lin, Yi Min Zhang, Wen Juan Zhou, Dan Hua Zhao, Xiao Jun Liu, Ying Hong Wu
Abstract: A new hybrid adsorbent of calcium-alginate encapsulated BaSO4-CR (CABSC) has been prepared. The adsorption selectivity and mechanism were studied by investigating the adsorption performance of two anionic and two cationic dyes. The adsorption of two cationic dyes (EV and MB) from aqueous solutions was examined using a batch sorption technique. The effects of time, pH, temperature and ionic strength on the adsorption were examined. Besides, this material was applied in the treatment of two practical cationic dye wastewaters. Our study shows that the sorbent could be a potential candidate for utilization in dye wastewater treatment processes.
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Authors: Dan Chen, Xiao Long Ma
Abstract: We fabricated new magnetic material CuFe2O4/Zn2Cr-LDH by the combination of CuFe2O4 and layered double hydroxide (LDH) through two steps. CuFe2O4 was prepared by sol-gel method with the assistant of citric acid, which was used in synthesis of the composite via microwave hydrothermal method subsequently. The physicochemical properties of the composite was characterized by several techniques, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Vibrating sample magnetometer (VSM) and Thermogravimetry-differential thermal analysis (TG-DTA). The magnetic composite reveals several advantage of LDH structure and spinel ferrite oxide and is potential for the application of heterogeneous catalysis.
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