Papers by Keyword: Phosphorus

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Authors: Da Ming Ban, Yang Min, Yong Hang Zhang, Ou Zhao
Abstract: A solid phase Bisphenol-A Bis(Diphenyl Phosphate) (BDP) , Poly Phenoxyl Bisphenol-A Phosphate(S-BDP)was synthesized from phenyl dichlorophosphate and bisphenol-A by bulk polymerization. The influence factors on the yield and molecular weight of S-BDP were investigated by the means of orthogonal design. The structure of S-BDP was characterized with Fourier Transform Infrared Spectroscopy (FTIR). The molecular weight was determined by Gel Permeation Chromatography (GPC). Thermal stability of S-BDP was studied by Thermal Gravimetric Analysis (TGA). The results review that S-BDP was synthesized successfully and its structure is similar to BDP. Thermal decomposition temperature is much higher than commercial available flame retardant.
Authors: Wen Xia Xie, Kun Jie Zhu, Hui Na Du
Abstract: As a supplementary theory of ecological system research, ecological stoichiometry has been applied to many research fields of wetland ecosystems at home and abroad. This article reported carbon nitrogen phosphorus element stoichiometry of soil, vegetation, among different components and after artificial disturbance in wetland ecosystems. Research showed that wetland ecological stoichiometry characteristics have important influences on the change and their interaction of carbon nitrogen phosphorus in the whole system and the internal mechanism of the carbon nitrogen phosphorus balance of wetland ecosystems. At the same time, it has provided an important reference for the management and protection of wetland ecological system.
Authors: Yi Xin Xu, Hua Yong Zhang, Xiang Xu, Jing Zhao, Fei Li
Abstract: Eco-exergy which is a thermodynamic indicator is applied to assess the ecosystem health status of QiXing Lake. And effects of nitrogen and phosphorus on ecosystem health status have been investigated. The results indicate that the ecosystem which contains macrophytes has the better health status than that does not contain macrophytes when they have the same concentration of nitrogen or phosphorus. The ecosystem health status decreased as the concentration of total nitrogen increased when the ecosystem contains macrophytes. However, the ecosystem health status has not significant change as the concentration of total nitrogen increased when the ecosystem does not contains macrophytes. It has the same law for total phosphorus.
Authors: Hai Lin, Zhi Ying Zhao, Le Yong Jiang, Wei Wei
Abstract: In this study, the zeolites were treated by NaCl and FeCl3 as an active agent, combined with calcination modification. We studied the ammonia nitrogen (NH3-N) and phosphorus (P) removal of the modified zeolites. The results showed that concentration of NaCl and FeCl3 affected NH3-N and P removal of Secondary sewage effluent greatly. The optimal concentrations of NaCl and FeCl3 were 2.0% and 0.4%. At this condition, the NH3-N and P removal rate of zeolites reached the peak. Application experiments revealed that NH3-N removal rate reached 80.9%, P removal rate reached 83.4%, and COD removal rate reached 96.0%, when the dosage of modified zeolites was 3.0g/L and adsorption duration was 2h for Secondary sewage effluent with 6.0mg/L NH3-N concentration and 1.5mg/L P concentration. After the treatment, the NH3-N and P concentration met Reclaimed Water Quality Standards. The adsorption capability of modified zeolites was better when the pH ranged from 3 to 6. The reason of using NaCl+FeCl3 was that Na+ could exchange the NH3-N in the effluent; Fe3+was able to combine with PO43- in the sewage and formed precipitate; and Fe3+ could also oxidize the organic pollutants.
Authors: Su Chen, Lei Chao, Ning Chen, Lin Shan Wang, Xin Liu, Li Na Sun
Abstract: In this experiment, water hyacinth presents a good purification effect in five kinds of eutrophic waters with initial total nitrogen (TN) and total phosphorus (TP) concentrations in between 8.34~20.45 mg/L and 0.78~1.51 mg/L. After two weeks of purification, TN and TP concentrations of eutrophic waters are reduced to 1.78~5.68 mg/L and 0.25~0.312 mg/L, and TN and TP removal rates are 72.22~78.65% and 67.95~79.34%. Water hyacinth’s TN removal rate decreases as TN initial concentration increases; TP removal rate increases as TP initial concentration increases. Water hyacinth’s average total biomass in eutrophic water has increased by 0.944~1.084 kg/m2, and the average bio-dry-weight has increased by 0.0470~0.0547 kg/m2. The average total biomass and average bio-dry-weight of water hyacinth increase as the eutrophication deepens.
Authors: Alexander Mattausch, M. Bockstedte, Oleg Pankratov
Abstract: We investigated the the interstitial configurations of the p-type dopants boron and aluminum and the n-type dopants nitrogen and phosphorus in 4H-SiC by an ab initio method. In particular, the energetics of these defects provides information on the dopant migration mechanisms. The transferability of the earlier results on the boron migration in 3C-SiC to the hexogonal polytype 4H-SiC is verified. Our calculations suggest that for the aluminum migration a kick-out mechanism prevails, whereas nitrogen and phosphorus diffuse via an interstitialcy mechanism.
Authors: Wei Lan Lin, Jin Chuan Gu, Yu Heng Wang, Wen Yuan Wang
Abstract: adsorption is a good method to remove phosphorus. In the experiment, lithium silica fume is used as the adsorption material, adsorption isotherms ,kinetics and dosage effects were examined. It shows that the adsorption kinetics data are consistent with the pseudo-second-order equation and the adsorption is easy to happen. Freundlich isotherm equation is fit for description of the adsorption. The maximum adsorption capacities on lithium silica fume is 1.166 mg/g. When dosage get to 12 g/l and the concentration of phosphorus solution is 2 mg/l, the removal rate reach to 95% at 308k.
Authors: Mei Na Liang, Hong Hu Zeng, Yi Nian Zhu, Ze Long Xu, Hui Li Liu
Abstract: The activated carbon was prepared firstly by soaking sugarcane bagasse in 0.39% AlCl3 solution, and then by carbonization in a charcoal kiln at 400oC for 2 days and activation in a muffle furnace at 900°C for 100 minutes. The adsorption removal of phosphorus from aqueous solution by the prepared activated carbons was studied in a batch adsorption system. The amount of phosphorus adsorbed per unit mass of adsorbent decreased from 1.13 to 0.33 mg/g and the removal percentage of phosphorus increased from 22.64 to 99.27% with increasing adsorbent dosages from 100 to 1500 mg in 50mL solution of the initial phosphorus concentration of 10mg/L. With increasing phosphorus concentrations from 1 to 30 mg/L, the amount of phosphorus adsorbed increased from 0.06 to 1.11 mg/g and the percent adsorption decreased from 91.93 to 57.34%. The dynamical data fit very well with the pseudo-second-order kinetic model (R2>0.9962) and the Langmuir model agreed well with the experimental data (R2>0.9648).
Authors: Juan Ting Wang, Yan Zhen Yu, Long Long Gao
Abstract: Spherical steel slag filter material with high porosity, large specific surface area was made by using steel slag as the main raw material, adding binder and pore forming agent. The influences of PH, phosphorus concentration and adsorption time on the adsorption effect of steel slag filter material were investigated. The adsorption characteristics of steel slag filter on phosphorus were studied based on adsorption isotherm model and adsorption kinetics model. Adsorption results were used to fit Langmuir and Freundlish formula. The correlation of Freundlish model was significant and the correlation coefficient was 0.92907.
Authors: Xiao Li Wang, Hui Juan Wang
Abstract: The Equilibrium Phosphorus Concentration (EPC0) of Hohhot dust (HD) of Inner mongolia was measured to examine whether the HD acted as sources or sinks of soluble reactive phosphorus (SRP) to the Yellow River water column. The modified Langmuir isotherm equation was modified to describe phosphorus (P) adsorption on the HD in Yellow River water. The EPC0 was higher than P concentration in the overlying water, which indicates that the HD acted as sources of phosphate. In addition, solid concentration (Cs) effect existed obviously in P adsorption experiment and the hysteresis got bigger as Cs increased.
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