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Jin Z.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Li T.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Li T.,Nankai University
Advanced Materials Research | Year: 2011

On the basis of a large number of continuous monitoring experiments for the five-line salinity of seawater, and the uncertainty of natural seawater oxidation reduction potential (ORP) is 2.2mV, the effect of seawater salinity on the equilibrium time of ORP is studied qualitatively and quantitatively. The results indicated that the greater the salinity, the longer the time of reaching to ORP equilibrium value, the longer the equilibrium time of the seawater ORP value. It is showed that the ORP equilibrium value was obtained at 30minutes, 90minutes, 120minutes, 240minutes and 300minutes from seawater with salinity as 5,20,30,35 and 40, respectively, and the equilibrium time was more than 12 hours. Accuracy and stability of the equilibrium time of seawater ORP value under different salinity can provide technical support for metrological verification of ORP sensor.

Ge M.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Li Y.,Nankai University | Liu L.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Zhou Z.,Nankai University | Chen W.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control
Journal of Physical Chemistry C | Year: 2011

Chrysanthemum-analogous Bi2O3?Bi2WO 6 composite microspheres, assembled by nanosheets, were synthesized through a one-step hydrothermal route with the aid of surfactant templates. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to clarify the structure and morphology of the Bi2O 3?Bi2WO6 microspheres. Nitrogen adsorption and desorption isotherms were conducted to examine the specific surface area and the pore nature of the as-prepared microspheres. The photocatalytic activity of the Bi2O3?Bi2WO6 composite microspheres was evaluated by using rhodamine B as a model contaminant, and over 99% of rhodamine B was degraded within 10 min under the exposure of sunlight. The Bi2O3?Bi2WO6 composite microspheres presented enhanced photocatalytic performances compared with separate Bi 2O3, Bi2WO6, and conventional P25. © 2011 American Chemical Society.

Dong M.,Nankai University | Wang X.,Nankai University | Huang F.,Nankai University | Jin Z.,Nankai University | And 3 more authors.
Advanced Materials Research | Year: 2012

The bio-toxicity of Fe0 nanoparticles on the denitrifying bacterial-Alcaligenes eutrophus was detected by the two methods of detecting inhibition of the growth of microorganisms and nitrification inhibition rate. The results showed that Fe0 nanoparticles had obvious toxicity on the growth and nitrification inhibition rate. Besides, there had distinct relationship between dose and toxicity of Fe0 nanoparticles. Meanwhile, we also studied effects of different kinds of Fe0 nanoparticles on microorganism, including bimetallic nanoparticles(nano Fe-Ni) and coated iron nanoparticles (sodium oleate-Fe0nanoparticles). We detected that the bio-toxicity of these three Fe0 nanoparticles followed the sequence of Ni-containing nanoparticles>unmodified NZVI>the sodium oleate-Fe0 nanoparticles. In conclusion, Fe0 nanoparticles had visible toxicity on the denitrifying bacterial, but we can decrease the toxicity of Fe nanoparticles by surface coating and decoration of nano-metal materials. © (2012) Trans Tech Publications, Switzerland.

Yue F.-N.,Nankai University | Yue F.-N.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Yue F.-N.,Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria | Luo S.-M.,Nankai University | And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2013

With the large amount production and application of engineering carbon nanomaterials, their potential ecological risk has attracted extensive attention. The degradation and transformation of the carbon nanomaterials in the environment directly affect the fates and eco-toxicity of the nanomaterials in the environment, and the research of the degradation and transformation processes of the nanomaterials in the environment is the key link for the determination of the environmental capacity of the nanomaterials and for the evaluation of the nanomaterials life cycle in the environment. This paper briefly introduced the chemical transformation, microbial degradation, and photodegradation of the major engineering carbon nanomaterials (carbon nanotubes and fullerene) in the environment, and summarized the environmental and structural factors affecting the degradation of the nanomaterials and the related intrinsic mechanisms. The shortcomings of the related researches and the directions of the future research were also put forward.

Guo T.,Nankai University | Guo T.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Zhang C.-D.,Nankai University | Zhang C.-D.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Zhang Q.-M.,Nankai University
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2010

Bioremediation of petroleum-contaminated saline soil was investigated via biostimulation (BS) and biostimulation-bioaugmentation (BS+BA) in a microscale simulation system. The removal of hydrocarbon and 16 PAHs, changes of soil pH, surface tension, dehydrogenase activity and microbial community structure were monitored during incubation. The results showed that soil properties were changed by the addition of humic acid, NovoGro and biological organic calcium. With the accumulation of acidic metabolites the soil pH decreased from 8.1~8.2 to 6.6~7.0 after remediation. Due to the microbial activities the surface tension of soil had decreased from 72.2 mN/m to 64.9 mN/m in BS+BA treatment and from 71.8 mN/m to 67.2 mN/m in BS treatment, respectively. Thus the bioavailability of petroleum hydrocarbons may be enhanced. The higher removal efficiency was obtained in BS+BA treatment in which 50.8% of TPH and 69.2% of total PAHs were degraded, whereas in BS treatment only 40.5% of petroleum hydrocarbon and 61.2% of total PAHs were degraded. Particularly, exotic microorganism showed high efficiency on removal of 5~6 ring PAHs. Different remediation strategies affected soil microbial activity notably, indicated by the dynamic changes of soil enzyme activity and bacterial community structure.

Xia H.,Nankai University | Jin Z.,Nankai University | Li T.,Nankai University | Li T.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2010

Three nanoiron-based particles, Fe, Fe/Ni and sodium oleate-coated Fe, were synthesized by liquid-phase reduction methods and then integrated with denitrifying bacteria to remove nitrate from groundwater. Batch experiments were carried out to examine the removal rate of nitrate and the final nitrogen transfomation products in these particle-bacteria systems. Also, the total RNA content in these systems was measured to evaluate the toxicity of nanoiron-based particles on the integrated bacteria. The results showed that almost 100% removal of nitrate was reached within 6 days in the Fe/Ni nanoparticle-bacteria system, and the ratio of ammonium to TN was 69% in the final products. Both nano-scale Fe and sodium oleate-coated Fe particle-bacteria systems took 9 days to complete 100% removal of nitrate, producing 52% and 16% ammonium, respectively. The total RNA of the integrated bacteria decreased in content by 93%, 40% and 34% in the Fe/Ni, Fe and sodium oleate-coated Fe nanoparticle-bacteria systems respectively, which suggested the toxicity of these nanoparticles to denitrifying bacteria should be in the sequence: nano-scale Fe/Ni > nano-scale Fe > sodium oleate-coated Fe.

Liu C.,Nankai University | Liu C.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Wang J.,Nankai University | Feng J.,Nankai University | Peng S.,Tianjin Research Institute of Water Transport Engineering
Marine Pollution Bulletin | Year: 2013

Suspended particles (SP) are increasing dramatically in Bohai Bay, China and may affect the growth and composition of phytoplankton assembly. To determine the effects of SP on the growth of two dominant phytoplankton species, Phaeodactylum tricornutum Bohlin and Gymnodinium sp., we cultured and tested their growth characteristics under SP concentrations ranging from 0gL-1 to 0.8gL-1. Our results show that the increase in the SP concentrations results in significant decrease in the maximum cell densities and the maximum specific growth rates of these two species. The half maximal inhibitory concentration (IC50) of SP to P. tricornutum and Gymnodinium sp. were 1.07gL-1 and 0.68gL-1 respectively, indicating the inhibitory effect of SP on Gymnodinium sp. was greater than on P. tricornutum. These results suggest that SP inhibits the growth of the two algal species and P. tricornutum is more tolerant to SP than Gymnodinium sp. © 2013 Elsevier Ltd.

Wang J.,Nankai University | Wang J.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Tian P.,Nankai University | Tian P.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | And 11 more authors.
Bioresource Technology | Year: 2016

This study investigated the performance of nano spinel nest-like oxygen-deficient Cu1.5Mn1.5O4 doping activated carbon (AC) as air cathode in microbial fuel cell (MFC). The Cu1.5Mn1.5O4 was synthesized via hydrothermal method and subsequent annealed. The maximum power density (MPD) of MFC with oxygen-deficient Cu1.5Mn1.5O4 modified cathode was 1928 ± 18 mW m−2, which was 1.53 times higher than the bare cathode. The electrochemical studies showed that Cu1.5Mn1.5O4 doping AC exhibited higher kinetic activity and lower resistance. The mechanism of oxygen reduction for the catalyst was a four electron pathway. The oxygen deficient of Cu1.5Mn1.5O4 played an important role in catalytic activity. So Cu1.5Mn1.5O4 would be an excellent promising catalyst for ORR in MFC. © 2016

Zhou W.,Nankai University | Jia X.,Nankai University | Jia X.,Tianjin Key Laboratory of Environmental Remediation and Pollution Control | Chen L.,Nankai University | And 5 more authors.
Materials Letters | Year: 2016

In this paper, sphere-like NiS was synthesized by solvothermal method. Furthermore, the electrocatalytic performance of NiS was tested as counter cells (CEs) of Dye-sensitized solar cells (DSSCs). Resulting from the inherent catalytic property and charge transfer ability, NiS exhibited excellent electrocatalytic performance towards I-/I3- redox reaction. And the power conversion efficiency of NiS CE (PCE=7.39%) was better than that of commercial Pt CE (PCE=7.06%). © 2015 Published by Elsevier B.V.

Li N.,Nankai University | Jin Z.-H.,Nankai University | Jin Z.-H.,Key Laboratory of Environmental Processes and Criteria | Li T.-L.,Nankai University | And 4 more authors.
Huanjing Kexue/Environmental Science | Year: 2011

Nanoscale zero-valent iron (NZVI) was synthesized by reduction in liquid phase, and autotrophic denitrifying bacteria were domesticated from activated sludge by self-made chemostat. Compared the denitrifying effects of adding NZVI only with that of adding booth NZVI and bacteria in nitrate culture fluid, including investigation of three forms of nitrogen(NO3 --N, NO2 --N, NH3/NH4 +-N) by spectrophotometer, and investigating the variety of pH in nitrate culture fluid by pH meter. Combining acridine orange (AO) dyed fluorescence photomicrograph, proved that biofilm has a leading role both in corrosion process of NZVI and in process of biotic denitrification of NZVI-bacteria system. Based on this, compared denitrifying effect in the circumstance of adding NZVI and bacteria separately with that in the circumstance of adding biofilm-NZVI composite which was made with glucose providing nutrition. Result shows that in the circumstance of adding NZVI and bacteria separately, NO3 --N in the system can be removed completely within 10 days, there are 37% of NO3 --N was transformed into ammoniacal nitrogen, the rest 63% of NO3 --N should have left solution in the form of gaseous denitrifying products. In the circumstance of adding biofilm-NZVI composite, NO3 --N in the system can be removed completely within 5 days, there are 28% of NO3 --N be transformed into ammoniacal nitrogen, the rest 72% of NO3 --N should have left solution in the form of gaseous denitrifying products. Experimental result also shows biofilm-NZVI composite has a greater abundance of microorganism and is more active in denitrification, it is suitable for removing the nitrate pollutant in groundwater.

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