Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 43 papers published in subject: > since this site started. |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Simultaneous removal of Cr(VI), Cd(II) and Pb(II) from aqueous solution by stabilized iron sulfide nanoparticles: Influencing factors and interactions of heavy metals | |||
ZOU Qingrong,WANG Wanyu,ZHANG Tong,LIU Yuanyuan | |||
Environmental Science and Techology 22 March 2020 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Cadmium (Cd), lead (Pb) and hexavalent chromium (Cr(VI)) often appear simultaneously in the soil and water influenced by metal smelting, chemical manufacturing and electroplating. In this study, synthetic iron sulfide nanoparticles (FeS NPs) stabilized with carboxymethyl cellulose (CMC) were utilized to remove Cr(VI), Cd and Pb from aqueous solution. Batch experiments, Visual MINTEQ model and XPS analysis were used to determine the removal efficiencies, influencing factors and mechanisms. FeS NPs suspension could remove Cr(VI), Cd and Pb simultaneously from aqueous solutions with removal capacities of Cr(VI), Cd and Pb of up to 418, 96, 585 mg per gram of stabilized FeS NPs and with final concentrations of 2.5, 0.1 and 0.1 mg/L at initial concentrations of 50, 10 and 50 mg/L, respectively. The acidic conditions significantly favored the removal of aqueous Cr(VI), while the alkaline conditions favored the removal of Cd and Pb. Oxygen would slightly inhibit the removal of Cr(VI), and there was no significant influence on that of Cd and Pb. A potential mechanism was proposed for the simultaneous removal of Cr(VI), Cd and Pb by using FeS NPs. Interactions of the three heavy metals involves the cationic bridging effect of Cd to promote the adsorption of Cr(VI), the enhanced adsorption effect to Cd by Cr-Fe-hydroxides, and the enhanced precipitation to Pb by chromate and sulfate. Therefore, FeS NPs have a high potential for the simultaneous removal of Cr(VI), Cd and Pb from the contaminated aqueous solutions. | |||
TO cite this article:ZOU Qingrong,WANG Wanyu,ZHANG Tong, et al. Simultaneous removal of Cr(VI), Cd(II) and Pb(II) from aqueous solution by stabilized iron sulfide nanoparticles: Influencing factors and interactions of heavy metals[OL].[22 March 2020] http://en.paper.edu.cn/en_releasepaper/content/4751293 |
2. Bioaccumulation and biomagnification of emerging bisphenol analogues in aquatic organisms from Taihu Lake, China | |||
Wang Qiang,Chen Meng,Zhu Lingyan | |||
Environmental Science and Techology 25 April 2017 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Due to regulations on bisphenol A (BPA) in many countries, a variety of bisphenol analogues are being widely manufactured and applied. However, there is a big knowledge gap on accumulation and biomagnification of these emerging bisphenols in aquatic organisms. The bioaccumulation and magnification of nine bisphenol analogues in aquatic organisms at different trophic levels collected from Taihu Lake, China, were evaluated. The total concentrations of the nine bisphenols in the lake waters were in the range of 49.7-3480 ng/L (average, 389 ng/L). BPA, bisphenol AF (BPAF) and bisphenol S (BPS) were the most predominant analogues in the water. The average natural logarithm bioconcentration factors (log BAFs) of BPAF, bisphenol C (BPC), bisphenol Z (BPZ) and bisphenol E (BPE) were greater than BPA, and there was a significantly positive correlation between log BAFs of the biphenols and their octanol-water partition coefficients (log Kow). The trophic magnification factors of BPAF, BPC and BPZ were 2.52, 2.69 and 1.71, respectively, suggesting that they had the potential to biomagnify in the food web. The results of this study call for further investigations on risk assessment of these emerging pollutants in the environment.????? | |||
TO cite this article:Wang Qiang,Chen Meng,Zhu Lingyan. Bioaccumulation and biomagnification of emerging bisphenol analogues in aquatic organisms from Taihu Lake, China[OL].[25 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4729307 |
3. Study the Adsorption of Humic Acid by Nano-amorphous Calcium Phosphate | |||
WEI Wei,JIANG Ling | |||
Environmental Science and Techology 18 April 2017 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this work, stabilized nano-amorphous calcium phosphate (nACP) was prepared using polyethylene glycol as stabilizer to obtain a nanosized amorphous adsorbent. The produced nACP was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron microscopy (SEM). The adsorption efficiency of the adsorbent for the removal of humic acid (HA) was evaluated under the effects of medium pH, contact time, temperature and ionic strength. The results of the study showed very good adsorption performance towards aqueous HA. The Sips modeling results revealed that the stabilized nACP adsorbent had a considerably high adsorption capacity (248.3 mg/g) for HA at 298 K. The adsorption data fitted well into pseudo-second order and Elovich kinetic models. By taking into account all results it was concluded that the nACP adsorbent leveraged its stability in combination with its high uptake capacity to offer a great promise for the removal of HA from aqueous solution. | |||
TO cite this article:WEI Wei,JIANG Ling. Study the Adsorption of Humic Acid by Nano-amorphous Calcium Phosphate[J]. |
4. A high-throughput, computational system to predict if environmental contaminants can bind to human nuclear receptors | |||
WANG Xiaoxiang,ZHANG Xiaowei,XIA Pu,ZHANG Junjiang,WANG Yuting,ZHANG Rui,J.P.Giesy,SHI Wei,YU Hongxia | |||
Environmental Science and Techology 13 October 2016 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Some pollutants can bind to nuclear receptors (NRs) and modulate their activities. Predicting interactions of NRs with chemicals is required by various jurisdictions because these molecular initiating events can result in adverse, apical outcomes, such as survival, growth or reproduction. The goal of this study was to develop a high-throughput, computational method to predict potential agonists of NRs, especially for contaminants in the environment or to which people or wildlife are expected to be exposed, including both persistent and pseudo-persistent chemicals. A 3D-structure database containing 39 human NRs was developed. The database was then combined with AutoDock Vina to develop a System for Predicting Potential Effective Nuclear Receptors (SPEN), based on inverse docking of chemicals. The SPEN was further validated and evaluated by experimental results for a subset of 10 chemicals. Finally, to assess the robustness of SPEN, its ability to predict potentials of 40 chemicals to bind to some of the most studied receptors was evaluated. SPEN is rapid, cost effective and powerful for predicting binding of chemicals to NRs. SPEN was determined to be useful for screening chemicals so that pollutants in the environment can be prioritized for regulators or when considering alternative compounds to replace known or suspected contaminants with poor environmental profiles. | |||
TO cite this article:WANG Xiaoxiang,ZHANG Xiaowei,XIA Pu, et al. A high-throughput, computational system to predict if environmental contaminants can bind to human nuclear receptors[OL].[13 October 2016] http://en.paper.edu.cn/en_releasepaper/content/4706889 |
5. The effect of oxidation on physicochemical properties and aqueous stabilization of multiwalled carbon nanotubes: Comparison of multiple analysis methods | |||
ZHANG Luqing,WANG Minhao,FANG Jing,YANG Kun,LIN Daohui | |||
Environmental Science and Techology 27 June 2016 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Surface oxidation can alter physicochemical properties of multiwalled carbon nanotubes (MWCNTs) and influence their aqueous stabilization. Many techniques have been used to characterize the physicochemical properties and aqueous stabilization of MWCNTs. However, the relationship between the change in physicochemical property and the aqueous stabilization of MWCNTs merits more studies, and the multiple characterization techniques have not been well compared. This study systematically and comparatively investigated the effect of oxidation on the physicochemical properties and aqueous stabilization of MWCNTs using multiple analysis methods. Increased surface area, disclosed tube ends, defects on the sidewalls, disruption of the electronic structure, and removal of metal catalysts and amorphous carbon were observed for the oxidized MWCNTs (o-MWCNTs) using the multipoint Brunauer-Emmett-Teller method, transmission electron microscope observation, Raman spectroscopy, UV-vis spectroscopy, and thermogravimetric analysis. An oxidation-time-dependent increase in oxygen content of the MWCNTs was verified by the methods of elemental analysis, mass difference calculation, and X-ray photoelectron spectroscopy (XPS). Fourier transform infrared spectroscopy, XPS, and the Boehm titration were employed to study the functionalities on the MWCNT surfaces. Despite the limitations of these techniques, the results indicated that the dramatic increase in carboxyl groups was mainly responsible for the significant increase in oxygen content after the oxidation. The dissociation of the grafted functional groups increased electronegativity of the o-MWCNTs and facilitated the aqueous stabilization of o-MWCNTs through electrostatic repulsions. The oxidation affected the UV-vis absorbance of MWCNT suspensions. The absorbances at 800 nm of the stabilized MWCNT suspensions had a good correlation with the MWCNT concentrations and could be used to quantify the MWCNT suspensions. The findings of this work are expected to boost the research on carbon nanotubes and their environmental behaviors. | |||
TO cite this article:ZHANG Luqing,WANG Minhao,FANG Jing, et al. The effect of oxidation on physicochemical properties and aqueous stabilization of multiwalled carbon nanotubes: Comparison of multiple analysis methods[J]. |
6. Sulfate reduction using an autotrophic biocathode under different initial pH values | |||
TENG Wenkai,ZHANG Renduo,LIU Guangli,LUO Haiping | |||
Environmental Science and Techology 08 June 2016 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper, the aim is to investigate the effect of initial pH of wastewater on the autotrophic sulfate-reducing biocathode. Experiments were conducted using double-chamber microbial electrolysis cell (MEC) under fed-batch mode. Sulfate removal in the MEC increased from 2.4% to 56% with initial pH values from 2.0 to 6.0. The maximum sulfate reductive rate of 57 ± 4.6 mg L-1od-1 was achieved with initial pH 6.0. The sulfate reductive rate reached 31 ± 0.85 mg L-1od-1 with initial pH 3.0, indicating that the autotrophic biocathode MEC could be used to remove sulfate under an acidic condition. High-throughput sequencing analyses showed that Proteobacteria accounted for more than 50% of the bacterial community on the biocathode. As important sulfate-reducing bacteria (SRB) belonging to Proteobacteria, Desulfovibrio sp. occupied 46% to 66% of the cathode biofilm with initial pH values from 3.0 to 6.0. Desulfovibrio simplex was proved to be acid tolerant and grew dominantly on the biocathode when the initial pH was 3.0. The autotrophic biocathode MEC should be a valuable alternative to remove sulfate in wastewater. | |||
TO cite this article:TENG Wenkai,ZHANG Renduo,LIU Guangli, et al. Sulfate reduction using an autotrophic biocathode under different initial pH values[OL].[ 8 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4696179 |
7. Potential methane production rates and its carbon isotopic composition from ornithogenic tundra soils in coastal Antarctica | |||
Bao Tao,Zhu Renbin,Bai Bo,Xu Hua | |||
Environmental Science and Techology 02 June 2016 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Methane (CH4) is one of important greenhouse gases with chemical activity. The determination of isotopic compositions for CH4 emitted from the soils helps us to understand its production mechanisms. CH4 isotope measurements have been conducted for different types of global terrestrial ecosystems. However, no isotopic data of CH4 have been reported from Antarctic tundra soils. In this paper, the ornithogenic soil profiles were collected from four penguin colonies, and potential CH4 production rates and its δ13C were investigated based upon laboratory incubation experiments. The mean CH4 production rates are highly variable in these soil profiles, ranging from 0.7 to 20.3 μgCH4-C kg-1 h-1. These ornithogenic soils had high potential production rates of CH4 under ambient air incubation or under N2 incubation, indicating the importance of potential CH4 emissions from penguin colonies. Most of soil samples had higher δ13C-CH4 under N2 incubation (-39.28%~-43.53%) than under the ambient air incubation (-42.81%~ -57.19%). Highly anaerobic conditions were conductive to the production of CH4 enriched in 13C, and acetic acid reduction under N2 incubation might be predominant source for soil CH4 production. Overall the δ13C-CH4 showed a significant negative correlation with CH4 production rates in ornithogenic tundra soils under N2 incubation (R2=0.41, p<0.01) or under the ambient air incubation (R2=0.50, p<0.01). Potential CH4 production from ornithogenic soils showed a significant positive correlation with total phosphorus (TP) and NH4+-N contents, pH and soil moisture (Mc), but the δ13C-CH4 showed a significant negative correlation with TP and NH4+-N contents, pH and Mc, indicating that the deposition amount of penguin guano increased potential CH4 production rates from tundra soils, but decreased the δ13C-CH4. The CH4 emissions from the ornithogenic soils affect carbon isotopic compositions of atmospheric CH4 in coastal Antarctica. | |||
TO cite this article:Bao Tao,Zhu Renbin,Bai Bo, et al. Potential methane production rates and its carbon isotopic composition from ornithogenic tundra soils in coastal Antarctica[OL].[ 2 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4694055 |
8. Effects of the Extracts of Phragmites australis on the Growth of Alternanthera philoxeroides | |||
ZHANG Zhen | |||
Environmental Science and Techology 13 May 2016 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper, we investigated the effects of ethanol extracts of Phragmites australis on the growth of Alternanthera philoxeroides, which would be helpful to control A. philoxeroides. The results showed that: 1) The ethanol extract of P. australis had allelopathic inhibition on A. philoxeroides (Synthetical response index of allelopathy<0), with that from stem of P. Australs showing strongest allelopathic effect on A. philoxeroides. 2) The ethanol extract of P. Australs decreased the bud number of ramets, root-top ratio and chlorophyll content, but increased the node number, plant height, leaf area, succulent degree and relative electric conductivity of A. philoxeroides. 3) The concentration of the ethanol extract of P. australis had little effect on the indexes of A. philoxeroides. | |||
TO cite this article:ZHANG Zhen. Effects of the Extracts of Phragmites australis on the Growth of Alternanthera philoxeroides[OL].[13 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4690286 |
9. Fate and Removal of Various Antibiotic Resistance Genes in Typical Pharmaceutical Wastewater Treatment Systems | |||
Zhai Wenchao,Mao Daqing,Luo Yi | |||
Environmental Science and Techology 25 December 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The high levels of antibiotic residues in pharmaceutical wastewater treatment plants (PWWTPs) make these plants the hotspots for the proliferation of antibiotic resistance genes (ARGs). This study investigated the fate and removal of 11 subtypes ARGs for sulfonamide, tetracycline, β-lactam and macrolide resistance in each stage of two full-scale PWWTPs in northern China. The levels of typical ARG subtypes in the final effluents ranged from (2.56±0.13)×10^1 to (2.36±0.11)×10^7copies/ml. The absolute abundance of ARGs in effluents accounted for only 0.03%-78.1% of influents of the two PWWTPs, while the majority of the ARGs were transported to the dewatered sludge with concentrations from (2.65±0.43)×10^5 to (4.27±0.03)×10^10copies/g dry weight (dw). The total loads of ARGs discharged through dewatered sludge plus effluent was 1.01-14.09 folds higher than that in the raw influents, suggesting the proliferation of ARGs occurred in the wastewater treatment. The proliferation of ARGs mainly occurs in biological treatment process, such as aeration tank, anoxic tank, sequencing batch reactor (SBR) and bio-contact oxidation, facilitates the proliferation of various ARGs, implying significant replication of certain subtypes of ARGs may be attributable to microbial growth. Chemical oxidation seems promising to remove ARGs, with removal efficiency ranged from 29.3% to 85.7%, while the partial correlation analysis showed significant correlations between antibiotic concentration and ARG removal. Thus the high antibiotic residues within the PWWTPs may have an influence on the proliferation, fate and removal of the associated ARG subtypes. | |||
TO cite this article:Zhai Wenchao,Mao Daqing,Luo Yi. Fate and Removal of Various Antibiotic Resistance Genes in Typical Pharmaceutical Wastewater Treatment Systems[OL].[25 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4673578 |
10. Fe-modified activated carbon fiber and its application for Fenton degradation of Rhodamine B | |||
TANG Dandan,CHEN Long,ZHANG Gaoke | |||
Environmental Science and Techology 01 December 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:An efficient Fe-modified activated carbon fiber (ACF-Fe) was successfully prepared as a heterogeneous catalyst for Fenton egradation of Rhodamine B by in situ physical and chemical activation method. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis confirm the existence of the Fe3O4 nanoparticles in the ACF-Fe catalyst. N2 adsorption-desorption analysis shows the specific surface area of the ACF-Fe could reach 432 m2/g. It is a typical microporous material. The catalytic activity of the ACF-Fe catalyst was evaluated by the degradation of Rhodamine B (RhB 100 mg/L) in the presence of hydrogen peroxide (H2O2) in the dark. The removal rate of RhB was over 95 % and the COD removal percentage was over 75 % by ACF-Fe/H2O2 Fenton system. Moreover, the catalyst still showed good catalytic property after being recycled for five times. Finally, a possible catalytic mechanism was proposed. | |||
TO cite this article:TANG Dandan,CHEN Long,ZHANG Gaoke. Fe-modified activated carbon fiber and its application for Fenton degradation of Rhodamine B[OL].[ 1 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4666728 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
|
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated