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Search Results: 1 - 10 of 23038 matches for " Jianru Liang "
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Template-Free Hydrothermal Synthesis of β-FeOOH Nanorods and Their Catalytic Activity in the Degradation of Methyl Orange by a Photo-Fenton-Like Process  [PDF]
Zhihui Xu, Jianru Liang, Lixiang Zhou
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2013, DOI: 10.4236/ojinm.2013.34010

The rod-shaped form of crystalline β-FeOOH (akaganeite) was prepared by the template-free hydrothermal method with urea as the homogeneous precipitant. X-ray diffraction, field-emission scanning electron microscope and Fourier transform infrared spectrum were used to characterize the resulting products. The degradation of methyl orange (MO) was studied using the prepared nanostructure materials in a photo-Fenton-like process. MO degradation was effectively achieved by hydroxyl radicals that were generated in the heterogeneous catalysis process. Specific surface area of the prepared β-FeOOH was an important factor affecting the efficiency of MO degradation, which depended on the synthesis conditions such as the reaction temperature, the initial concentration of urea and FeCl3.6H2O as well as the n(urea)/n(Fe3+) ratio. The photodegradation efficiencies slightly decreased with the increase of initial pH in the range of 4.5 - 9.5, which indicated the prepared β-FeOOH catalyst can well overcome the drawback of a narrow pH range of homogeneous Fenton reaction. β-FeOOH catalysts loading and H2O

Advances in Arabidopsis research in China from 2006 to 2007
Yan Liang,JianRu Zuo,WeiCai Yang
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0274-1
Les fonctions du langage au travail
Jianru YE
Studies in Literature and Language , 2011, DOI: 10.3968/j.sll.1923156320110303.130
Abstract: The language at work was an area neglected by linguistics. However, with the development of economy and the advancement of technology for the past ten years, the language at work has undergone profound changes and plays an increasingly important role. In this article we will analyze the functions of language at work and better understand the instrumental , cognitive and social functions of language at work. At the same time through study the language at work make us to rethink profoundly on the existing theories and methods of modern linguistics. Key words: Language in trvail; Functions RésuméLe language au travail était un domaine oublié par la linguistique. Mais depuis une dizaine d’années, avec les développements économiques et les progrès technologiques, le langage au travail a connu de profonds changements et joue un r?le de plus en plus important. Dans cet article, on essayera d'analyser les fonctions du langage au travail et de mieux saisir les fonctions instrumentale, cognitive et sociale du langage dans l’entreprise. En même temps, la prise pour objet d’étude du langage au travail nous oblige à réfléchir de nouveau sur les théories et les méthodes existant de la linguiste moderne. Mots-clés: Langue au trvail; Les fonctions
Les Nouvelles Perspectives pour les études du Langaga au Travail
Jianru YE
Canadian Social Science , 2013, DOI: 10.3968/3286
Abstract: Avec le développement de science, de technologie et d’économie, le langage est devenu de plus en plus important dans les entreprises. Les études du langage au travail émergent aux yeux des chercheurs. Cependant, il est difficile de progresser en utilisant les théories et les méthodes existant dans la linguistique et la sociolinguistique quand on fait des recherches de ce domaine. Face aux nouveaux problèmes apportés par des nouveaux objets d’études, avec de nouvelles perspectives et une nouvelle méthodologie, nous essayons de renover et développer un peu les théories linguistiques. Mots-clés: Socio linguistique; Langage au travail
Interactive effect of dissolved organic matter and phenanthrene on soil enzymatic activities

Xinhua Zhan,Wenzhu Wu,Lixiang Zhou,Jianru Liang,Tinghui Jiang,

环境科学学报(英文版) , 2010,
Abstract: The investigation of dissolved organic matter (DOM) on urease, catalase and polyphenol oxidase activity in a phenanthrene (Phe)-contaminated soil was conducted under laboratory incubation conditions. Values of soil enzymatic activity depended mainly on incubation time. In the initial 16 days, urease activity increased, and was followed by a decrease. In the initial 8 days, catalase activity decreased and then increased. Variation of polyphenol oxidase activity was just the reverse of catalase activity. After 30 days of incubation, no pronounced difference among treatments with Phe, Phe and DOM, and control were detected in urease, catalase and polyphenol oxidase activity. Phe might inhibit urease and catalase, and stimulate polyphenol oxidase. DOM could improve inhibition of Phe in soil urease and catalase activity during the initial period of applying DOM. Nevertheless, DOM had no significant effect on polyphenol oxidase activity in the Phe contaminated soil. There was a negative correlation between catalase and polyphenol oxidase (r = -0.761~(***)), and catalase and urease (r = -0.554~(**)). Additionally, a positive correlation between polyphenol oxidase and urease was also detected (r = 0.701~(***)). It is implied that the formed DOM after application of organic wastes into soils may counteract the inhibition of polycyclic aromatic hydrocarbons in soil enzyme activities.
Effects of iron/potassium molar ratio on mass of biogenic Fe(Ⅲ) hydroxysulfate precipitates in the FeSO4-K2SO4-H2O system and their environmental implications

BAI Shuangyou,LIANG Jianru,ZHOU Lixiang,

环境科学学报 , 2010,
Abstract: In the FeSO4-K2SO4-H2O biological oxidation system facilitated by Acidithiobacillus ferrooxidans, secondary ferric hydroxysulfate minerals are able to be synthesized including schwertmannite, potassium jarosite, and their mixture. In our system, the initial concentrations of ferrous iron were designed as 20, 40, 80 and 160 mmol·L-1 and the Fe/K molar ratios for each ferrous iron concentration treatment were designed as 3 to 200. The results show that treatment with lower initial Fe2+ levels such as 20 mmol·L-1 or 40 mmol·L-1 only produces a small amount of the precipitate with no more than 0.38 g produced after 72 h of reaction. With the increase of initial Fe2+ and the decrease of Fe/K molar ratios in the solution, the total amount of the precipitate formed by Acidithiobacillus ferrooxidans is greatly increased. For example, 4.48 g of jarosite are precipitated from 250mL of solution when the initial Fe2+ is 160 mmol·L-1and Fe/K is 3. The XRD pattern indicated that the precipitate is gradually transformed to crystallized jarosite from poorly-crystallized schwertmannite, exhibiting a close relationship between the mass produced and the mineral phase. For example, the amount of the precipitates formed as crystalline jarosite is much higher than that as poorly-crystallized schwertmannite. Therefore, the amount of biogenic minerals formed in the biological oxidation system depends, to a great extent, on the initial Fe2+ concentration and Fe/K molar ratio. This phenomenon is of potential significance in the removal of soluble Fe and SO2-4 from acid mine drainage.
Effects of storage time and recycling of resting Acidithiobacillus ferrooxidans cells on biogenic schwertmannite formation

BAI Shuangyou,LIANG Jianru,LIAO Yuehua,ZHOU Lixiang,

环境科学学报 , 2011,
Abstract: Schwertmannite biosynthesized by resting Acidithiobacillus ferrooxidans (A.ferrooxidans) with FeSO4 has high purity and specific surface area. It plays an important role in the removal of toxic heavy metals or metalloid in water environmental. To provide the optimum parameters for schwertmannite scale production, the effects of storage time of resting A.ferrooxidans cells and reuse of the recycling cells on the strain growth and its ability in facilitating Fe2+ oxidation and mineral formation were investigated through the flask experiments. The results indicated that the fresh resting A.ferrooxidans cells harvested within 30 d could completely oxidize 144 mmol L-1 Fe2+ to Fe3+ after 48 h in the system with initial pH 2.50. In the presence of excess SO42-, about 41.99% of the ferrous iron was transformed into the brown-red schwertmannite, and mineral weight reached 1.34 g in 250 mL system. Compared to fresh resting A.ferrooxidans cells, the Fe2+ oxidation percentage by the relatively aged resting A.ferrooxidans cells stored for 45 d at 4 °C was decreased by 5.61%, and the schwertmannite weight was decreased by 35.07%. Furthermore, the reuse of resting A.ferrooxidans cells resulted in a significant reduction of Fe2+ oxidation with only 1/7 of the Fe2+ oxidation ability of fresh resting cells, which was contributed to the oxidation ability decline of the reused cells itself and the cell density decrease of A.ferrooxidans due to absorption or wrapping by minerals. Therefore, the newly-prepared resting A.ferrooxidans cells should be used in time or its storage time should not exceed 30 d in the acidic solution at 4 °C. The resting A.ferrooxidans cells could be recycled and used for the biosynthesis of schwertmannite, but its efficiency was only about 15% of newly-prepared resting cells.
A 200-ka carbon isotope record from the South China Sea
Jianru Li,Pinxian Wang
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2032-1
Abstract: A stacked ocean carbon isotope (δ 13C) record of 200 ka is established on the basis of planktonic foraminifer (Globigerinoides ruber) δ 13C data from 8 sites in the South China Sea (SCS). The δ 13C record from the SCS displays a trend similar to that from the Pacific and Atlantic oceans mainly responding to long eccentricity and precession cycles, with all the three δ 13C minima occurring at glacial terminations. Thus, the changes of the oceanic carbon reservoir in glacial cycles should not be considered as a response only to ice-sheet variations, but could have been driven also by low latitude processes, such as the monsoon.
Characterization and As (Ⅲ) adsorption properties of schwertmannite synthesized by chemical or biological procedures

LI Zheying,LIANG Jianru,BAI Shuangyou,ZHOU Lixiang,

环境科学学报 , 2011,
Abstract: An amorphous ferric hydroxysulfate named schwertmannite,as a novel material,has played an important role in transference and passivation of toxic heavy metals. In this study,schwertmannite was synthesized by two different procedures:chemical oxidation of ferrous iron by H2O2 and bacterial oxidation of ferrous iron by resting Acidithiobacillusferrooxidans cells in ferrous sulfate solution. The components,structures and surface areas of the minerals were analyzed and characterized by XRD,SEM,Ic and BET. In ad...
Removal of As(Ⅲ)in simulated groundwater through adsorption by biosynthesized or chemosynthesized schwertmannite

LI Zheying,LIANG Jianru,BAI Shuangyou,ZHOU Lixiang,

环境科学学报 , 2011,
Abstract: 施氏矿物作为一种具有良好应用前景的高砷吸附材料已倍受人们关注。采用静态吸附实验对生物、化学成因施氏矿物去除模拟地下水中As(III)进行了研究。结果表明,在25℃,初始As(III)浓度为0.2mg/L,施氏矿物投加量为0.25g/L时,生物成因施氏矿物吸附3h后溶液中As(III)含量降低到10μg/L以下(地下水饮用标准),吸附最佳pH范围为6~10,化学成因施氏矿物在pH7~8,则需吸附平衡12h后溶液中As(III)含量才能达到10μg/L以下。当介质中存在PO43–和SiO32-时,生物成因施氏矿物表现出对As(III)专性吸附能力强于化学成因施氏矿物。等温吸附实验(25℃)表明,生物成因施氏矿物对As(III)的最大吸附量为101. 9mg/L,比化学成因施氏矿物(82.1mg/L)高出约24.1%,表现出更优异的吸附性能。
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