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Search Results: 1 - 10 of 34442 matches for " ZHOU Lixiang "
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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
Abstract:

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

Cadmium transport mediated by soil colloid and dissolved organic matter: A field study
Cadmium transport mediated by soil colloid and dissolved organic matter: A field study

Zhaoli LI,Lixiang ZHOU,
Zhaoli Li
,Lixiang Zhou

环境科学学报(英文版) , 2010,
Abstract: This study investigated the potential role of soil colloids and dissolved organic matter (DOM) in transporting Cd through in situ undisturbed paddy soil monoliths. Brilliant Blue was used as a tracer to assess the effect of preferential flow on Cd down migration. Experimental results showed that deep penetration of Cd and Brilliant Blue into the soil profile took place due to the preferential flow through macropores, mainly earthworm channels, with much of chemicals thus bypassing the soil matrix. Dye trace...
Effect of biosurfactant on the sorption of phenanthrene onto original and H2O2-treated soils

PEI Xiaohong,ZHAN Xinhua,ZHOU Lixiang,

环境科学学报(英文版) , 2009,
Abstract: The objective of this study was to examine the effect of biosurfactant on the sorption of phenanthrene (PHE) onto the original or H2O2-treated black loamy soil (typic isohumisols) and red sandy soil (typic ferralisols). The sorption isotherms were performed with the original and “soft” carbon-removed soils in the presence and absence of biosurfactant (200 mg/L). The sorption and degradation of biosurfactant were investigated. The result showed that organic matter played an important role in PHE sorption onto the black loamy and red sandy soils, and the PHE sorption isotherms on the “soft” carbon-removed soils exhibited more nonlinearity than those on the original soils. The values of partition coefficient (Kd) on the original black loamy soil with or without 200 mg/L biosurfactant were 181.6 and 494.5 mL/g, respectively. Correspondingly, in the red sandy soil, Kd was 246.4 and 212.8 mL/g in the presence or absence of biosurfactant, respectively. The changes of Kd suggested that biosurfactant inhibited PHE sorption onto the black loamy soil, but facilitated PHE sorption onto the red sandy soil. The nonlinearity of PHE sorption isotherm was decreased in the presence of biosurfactant. Site specific sorption might occur during PHE sorption onto both the original and the “soft” carbon-removed soils in the presence of biosurfactant. It was noted that biosurfactant could also be sorbed onto soils. The maximal sorption capacity of the red sandy soil for biosurfactant was (76.9 ± 0.007) μg/g, which was 1.31 times that of black loamy soil. Biosurfactant was degraded quickly in the two selected soils, and 92% of biosurfactant were mineralized throughout the incubation experiment for 7 d. It implied that biosurfactant should be added frequently when the remediation of polycyclic aromatic hydrocarbon (PAH)-contaminated soils was conducted through PAH desorption approach facilitated by biosurfactant.
Enhancing sewage sludge dewaterability by bioleaching approach with comparison to other physical and chemical conditioning methods

Fenwu Liu,Jun Zhou,Dianzhan Wang,Lixiang Zhou,

环境科学学报(英文版) , 2012,
Abstract:
Influences of Extracellular Polymeric Substances on the Dewaterability of Sewage Sludge during Bioleaching
Jun Zhou, Guanyu Zheng, Xueying Zhang, Lixiang Zhou
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102688
Abstract: Extracellular polymeric substances (EPS) play important roles in regulating the dewaterability of sludge. This study sought to elucidate the influence of EPS on the dewaterability of sludge during bioleaching process. Results showed that, in bioleaching system with the co-inoculation of Acidithiobacillus thiooxidans TS6 and Acidithiobacillus ferrooxidans LX5 (A. t+A. f system), the capillary suction time (CST) of sludge reduced from 255.9 s to 25.45 s within 48 h, which was obviously better than the controls. The correlation analysis between sludge CST and sludge EPS revealed that the sludge EPS significantly impacted the dewaterability of sludge. Sludge CST had correlation with protein content in slime and both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers, and the decrease of protein content in slime and decreases of both protein and polysaccharide contents in TB-EPS and Slime+LB+TB layers improved sludge dewaterability during sludge bioleaching process. Moreover, the low sludge pH (2.92) and the increasing distribution of Fe in the solid phase were another two factors responsible for the improvement of sludge dewaterability during bioleaching. This study suggested that during sludge bioleaching the growth of Acidithiobacillus species resulted in the decrease of sludge pH, the increasing distribution of Fe in the solid phase, and the decrease of EPS content (mainly including protein and/or polysaccharide) in the slime, TB-EPS, and Slime+LB+TB layers, all of which are helpful for sludge dewaterability enhancement.
Determination of COD by spectrophotometry with self-prepared digestion solution
自配消解液分光光度法测定污水中的COD

Zhou Jun,Yang Xinping,Zhou Lixiang,
周俊
,杨新萍,周立祥

环境工程学报 , 2009,
Abstract: 以自配消解液代替ThermoFisher公司AQ4001COD测定系统的专用消解液,比较了自配消解液分光光度法与国家标准重铬酸钾法(GB 11914-1989)测定化学需氧量(COD)的差异。对比试验表明,自配消解液分光光度法测定COD的结果精确度和准确度高,与国家标准方法无显著性差异。自配消解液分光光度法测定水样COD值的相对标准偏差;低量程(30~150 mg/L)为1.38%~2.53%,中量程(0~1 500 mg/L)为0.47%~3.63%,高量程(2 000~15 000 mg/L)为0.17%~3.53%,在国家标准方法测试水样COD值的允许误差范围内。除制革废水外,自配消解液可以代替AQ4001COD测定系统的专用消解液,适用不同量程范围内污水COD的测定。自配消解液分光光度法具有试剂使用量少、速度快、经济、二次污染小等优点,值得在环境科学领域及废水水质监测中推广应用。
A STUDY ON THE FOLDING OF CREATINE KINASES FROM HUMAN AND RABBIT MUSCLE AT LOW pH
人肌和兔肌肌酸激酶在低pH条件下再折叠的研究

Li Jinping,Hob Lixiang,Zhou Haimeng,
李锦平
,侯立向,周海梦

生物物理学报 , 1994,
Abstract: The confonnational stabal of cleatjne the from human and rabbit muscle at acidic pHun examined by the intrinsic proch fluoascence and far--ultlaviolet cellular dichIDism(far--UV CD). The adults we obtained show that at low iohic singtin, by adding HCl, tonative ha and rabbit creatine kinals ash proteins tended to adopt almost an fillly tmfolded confonnational state in the vicely of PH 2.0. Their tryptophan fluorescenceemission had a lhawh at the indicating a complete exposure of the nyptophan asiduesto the solvent. Thed far--UV CD spectla shoal partly disonled secondary str uperthg, butthe se dena Proteins retained soak secondary strucks. However, at high ionic strength andlow PH an in inte confonnational state (molten-globule state) which was fnSt discoverby Goto et al un also olived in our pat experiment . This intointe had a secondary thestructute similar to that of the nahve enzyme. The tryptophan fluorescence spectla were similar,with a mhanum at 335nm to that of the native on, indicating that the protein is almostrefolded complmp. Hoal, the intenSity of fluorescence elnjssion was much lower than thato f native enzyme, indicating that this state is more mobile and adulting in dynamicfluo quenching. The present adults support Goto's discovery. It is suggeStal thatmolten-globule state opt be an nounal folding lute-iate state of proteins.
Dynamics of dissolved organic matter in terrestrial ecosystem and its environmental impact
陆地生态系统中水溶性有机物动态及其环境学意义

WANG Genmei,ZHOU Lixiang,
王艮梅
,周立祥

应用生态学报 , 2003,
Abstract: Dissolved organic matter (DOM), the most active organic carbon pool in terrestrial ecosystem, has a greater effect on the mobilization, translocation, and ecological toxicity of many inorganic and organic pollutants in environment. The DOM concentration in farmlands varies from 10 to 80 mgC.L-1, while most of wetlands contain 25-50 mgC.L-1 of DOM, which is similar to the leachate from forest soils. However, soil DOM can be increased to above 200-1000 mgC.L-1 in the rhizosphere or in the plots amended with organic manures. Generally, soil DOM containing a great deal of lower molecular weight fractions or hydrophilic fractions is more mobile and readily biodegradable, compared to the DOM with larger molecular weight or hydrophobic fractions. However, soils with lower pH and higher amount of oxides can adsorb DOM more strongly, and as a result, the mobile DOM in the soils will be reduced. Liming, water-logging, dry-wet recycling and higher temperature can increase the concentration of soil DOM. Furthermore, DOM can enhance the dissolution and translocation of inorganic and organic pollutants, due to the formation of DOM-pollutant complex, resulting in environmental risks. It was suggested that the dynamics of DOM in terrestrial ecosystem and the transportation flux and model of DOM or its associated pollutants from terrestrial to aquatic ecosystem should be considered in future research.
Application of plant polyphenols in environmental protection and agricultural production
植物多酚在环境保护与农业生产中的应用

FU Meiyun,ZHOU Lixiang,
付美云
,周立祥

应用生态学报 , 2004,
Abstract: Plant polyphenols,the secondary metabolites in plant,contain many phenol-hydroxyl groups.They can bind with protein,alkaloids and polysaccharides,and consequently,exhibit an astringent property.Plant polyphenols can also bind with metal ions to form polyphenol-metal complexes,which are probably soluble or precipitated,depending on the type of plant polyphenols.Up to now,about 600 plant polyphenols have been found.Plant polyphenols can be applied widely in environmental pollution control and agriculture production.
Effects of dissolved organic matter in landfill leachate on soil Cd-and Pb bioavailability
渗滤液溶解性有机物对土壤Cd、Pb有效性的影响

FU Meiyun,ZHOU Lixiang,
付美云
,周立祥

应用生态学报 , 2006,
Abstract: A pot experiment was conducted to study the effects of dissolved organic matter (DOM) in landfill leachate on ryegrass growth and its uptake of soil Cd and Pb. Fresh sample and Shuige leachate were collected from the municipal waste landfills established 0 and 12 years, respectively. The results showed that after the landfill leachate added, the average concentration of DOM remained in soil was 1.39 (fresh sample) and 1.47 (Shuige) times higher than the control (CK). The bioavailability of Cd and Pb in the soils treated with the two leachates was fluctuated in early period, and then raised. Compared with CK, the bioavailability of soil Cd was increased by 4.81% (fresh sample) and 48.97% (Shuige), and that of soil Pb was enhanced by 7.22% (fresh sample) and 18.99% (Shuige). The total concentrations of plant Cd and Pb in the treatments of fresh sample and Shuige were 19.59% and 104.4%, and 36.03% and 44. 66% higher than CK, respectively, while the total biomass of ryegrass was decreased by 14.03% to approximately 52.24%, in compared with CK. It could be inferred that the dissolved organic matter (DOM) in landfill leachate, especially in that from the landfills established for a longer time, could enhance the bioavailability of soil heavy metals and their accumulation in plant, and thus, suppress the growth of plants.
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