Abstract: Biomophic titanium oxide with nanocrystalline was successfully synthesized using napkin template, which everybody uses. Unique biomorphic microstructures were characterized by field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM) and nitrogen absorption-desorption techniques. TiO2 material was characterized by repetitious networks consisting of the fibers with diameter of 1-6μm. The results showed that the products were composed by polycrystalline TiO2 nanoparticles with diameter of ca. 5-8 nm and the high specific surface area (81.0 m2·g-1) of sample,which were believed to result from the X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and the Brunauer-Emmett-Teller (BET) method. While the concentration of acid black solution was 20 mg/L, catalyst amount 0.1 g/L, the reaction had a higher photocatalytic performance following irradiation with a visible light by xenon lamp, the decoloring rate can reach over 100% after 250 min.
Abstract: Previous studies predominantly degraded organic matter in simulated water samples containing one or two organic components, while a few literatures reported organic matter degradation in natural and actual sewage water samples. This is likely due to the ingredient of surface water or actual sewage coexisted with many kinds of organic pollutants being complex. The relationship among coexisting organic materials is complex during photocatalytic degradation. Moreover, the coexistence of many kinds of inorganic pollutants in natural or actual sewage water samples is also common. Thus, the influence of coexisting inorganic pollutants on degradation is also worthy of study. This work explored these influences of TiO2-bentonite composite catalysts. 8.6%~11.5% sodium dodecyl benzene sulfonate (SDBS) in surface water or clothes laundering drain water was degraded by 3‰ TiO2-bentonite within 6h under 6W ultraviolet light. Under the same conditions, 86.5% of the SDBS in aqueous solution was degraded. The difference was obvious, but the causes were complicated. For example, the influence of , , and on the degradation was discussed. The results show that the influence of on the above degradation was obvious, while and was not obvious. In addition, and were captured by resulting a decrease of degradation speed. Competition of , and SDBS for surface active sites decreased the efficiency of the degradation. Based on these results, pretreatment such as filtering, deposition and impurity removal before actual sewage is degraded could improve the degradation efficiency. Further study, such as on the reasons for efficiency reduction, on new pretreatment methods and on the application of multi-treatment measures, is needed to conduct.
Abstract: Five types of TiO2-bentonite catalyst, #1, #2, #3, #4, and #5, were prepared separately using hydrochloric acid, nitric acid and perchloric acid by the sol-gel method. The original concentration of sodium dodecyl benzene sulfonate (SDBS) in the aqueous solutions was 20 mg/L. The amounts of SDBS degraded by #1, #2, #3, #4 and #5 under a 6 W ultraviolet lamp were compared, the influences of #1 and #2 on the chemical oxygen demand (COD) of the aqueous solutions studied. And the influences of the initial pH on the degradation of SDBS and on the COD of aqueous solutions were investigated. The results showed as the following. (1) When the catalyst input was 0.5‰ and the solutions were irradiated with a 6 W ultraviolet lamp, 81.0%, 90.5% 47.5%, 39.5% and 26.5% of the SDBS in the aqueous solutions was degraded within 2 hours by catalysts #1, #2, #3, #4 and #5, respectively. The COD was reduced by 8.81% and 50.84%by catalysts #1 and #2, respectively. (2) Under an ultraviolet lamp, 94.5% and 99.3% of the SDBS in the aqueous solutions was degraded and 33.59% and 96.93% of the COD was reduced within 6 hours by catalysts #1 and #2, respectively. TiO2-bentonite catalyst #2 was the best based on the effects on the degradation of SDBS and on the reduction of the COD of aqueous solutions. Using nitric acid was better than using hydrochloric acid or perchloric acid for the preparation of TiO2-bentonite. (3) Under the same conditions (20 mg/L SDBS, 20°C, ultraviolet light irradiation time of 2 h, electromagnetic mixing, 0.5‰ input of TiO2-bentonite #2 ), 90.3% and 90.5% of SDBS was degraded by TiO2-bentonite #2 at pHs 6 and 8, respectively. The optimal pH range for SDBS degradation was 6~8. The COD was reduced by 59.5% and 63.5% pHs 4 and 6, respectively. The optimal pH range for the COD reduction was 4 ~ 6. The pH had a clear effect on SDBS degradation and the COD of the aqueous solutions.
Abstract: Development of circular economy is a certain choice for economic sustainable development, to establish a circular eco-industrial park for comprehensive utilization of coal gangue in coal enterprise is a new exploration for circular economy. In order to make vast and efficient use of existing and newly increased coal gangue to resolve the serious environmental and ecological problems, the preparation of coal gangue glued stone was investigated. The glued stone products could be used for backfill material; In order to produce the coal gangue glued stone, we heated the coal gangue in the rotary kiln, and the flue gas waste heat could be recovered and used for thermal power generation, and the power is back to the circular eco-industrial park. The mining wastewater could be used for power generation, domestic water and production water after compound purification treatment. Associated effects and synergistic effects of the different industries that integrated and connected with each other could get the double wins between the economic development and the environmental protection.
Abstract: A composite adsorbent La/Fe/FA for reactive turquoise blue KN-G (RTB KN-G) and reactive brilliant blue KN-R (RBB KN-R) removal from aqueous solution was prepared by loading lanthanum (III) and iron (III) onto waste coal fly ash (FA). The adsorption behavior of RTB KN-G and RBB KN-R on La/Fe/FA was investigated systematically. The results show that the initial dye concentration, contact time, pH value and temperature are all the important factors influencing the adsorption. The adsorption of La/Fe/FA for two reactive dyes at different temperatures were very fast and can establish sorption equilibrium at 30min, and agreed well with pseudo-second-order kinetics. The equilibrium adsorption data could be described by the Langmuir isotherm equation well, and obtained maximum adsorption capacities at 25°C were 56.28 mg/g for RTB KN-G and 116.82mg/g for RBB KN-R, respectively. The rise of temperature was not conducive to adsorption. The results show that the La/Fe/FA adsorbent displays high effective adsorption for reactive dyes and will have potential as a promising application in the field of water pollution control and recycling utilization of resources.
Abstract: Adsorption-catalytic oxidation of terephthalic acid (TA) from waster water using modified diatomite adsorbent was studied in this paper. Two diatomites were chosen for adsorbents and TA was used as a model compound. The process consists of physic adsorption of TA and catalytic oxidation of TA. The concentration of TA was determined by UV spectrometry. The results indicate that adsorption capacity of diatomite increased with the decrease of pH value of waster water. The equilibrium adsorbed amount of modified diatomite increased with the increase of metal content in the initial metal content range from 0 to 5% for both of Ni, Fe and Cu modified diatomite, and then the equilibrium adsorbed amount decreased after 5% metal content for Ni modified diatomite and in general kept constant for Fe and Cu modified diatomite. The maximum amount of TA adsorbed at the equilibrium stage was 4.40mg/g for Ni-5/RD. The adsorption capacity of raw and modified diatomite decreased obviously with the increase of cycle number in the initial first-fourth of cycle and then decreased very slowly in the 5th-10th of cycle. The Qe of Ni-5/RD, Fe-5/RD, Cu-5/RD and RD in the 10th cycle were 3.12, 2.44, 1.87 and 0.12mg/g, respectively. The result indicated that the modified could be repeatedly used and maintained the adsorption/regeneration performance stably through many batches of operation.
Abstract: Catalytic oxidization has been studied for elimination of indoor formaldehyde. It was found that manganese dioxide (MnO2) is the most effective catalyst among all the tested catalysts at room condition. In the present investigation, the formaldehyde removal efficiency of several commercially available MnO2 catalysts was studied with typical method. Studies showed that the efficiency of MnO2 can be affected by the particle size, the dispersity and the work hours.
Abstract: The energy consumption of window accounts for nearly half of buildings. The purpose of this study is to compare the environmental impact of plastic windows and aluminum alloy windows production, including resource and energy consumption, waste emission. The result shows that energy consumption of plastic window production is only 0.24 times of aluminum alloy window production, and the overall environmental impact of the former is 30% of the later. This study is a quantitative description of energy consumption and environmental impact of two windows production pattern, which intends to fill the blank in LCA field of windows in China.
Abstract: Based on life cycle assessment, analysis of energy consumption and other environment load by steel production in Chinese typical iron and steel industry was carried out. The process accounted for the most environment load was found by studying the different processes in steel production route. The results indicate that the most important process is blast furnace (BF) which is the major factor of CO2 and CO emissions, and contributes most to globe warming potential (GWP) and photochemical ozone creation potential (POCP).
Abstract: Although outer wall thermal insulation technology is an effective measure for building energy-saving, the production of thermal insulation materials causes serious impacts on environment. In the present investigation the resource, energy consumption and environmental emission of the two kinds of thermal insulation materials were analyzed, from the acquisition of raw materials to production process based on Life Cycle Assessment (LCA). The result show that life cycle energy consumption of rock wool board is 415MJ per functional unit, proximately twice of EPS board’s (220MJ). Overall, environmental impact indicators caused by rock wool board is more serious than EPS.