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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 | |||
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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. Selective removal and recovery of Fe(III) by garlic residue gel adsorption | |||
Xue Jiehao,Zhang Yangzhong,Meng Yeping,Zhou Hongyu,Huang Ying,Liu Junyou,Yin YanLi,Huang Kai | |||
Environmental Science and Techology 31 October 2018 | |||
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Abstract:Removal of iron in hydrometallurgical processes is a quite popular challenge, and the traditional methods such as precipitation may cause severe secondary pollution and resources waste. In present study, we attempted a cheap and effective technique to remove the iron ions by adsorption onto garlic residue gels. A simple chemical modification method to modify the peel by calcium hydroxide was proposed. Results showed that the optimal equilibrium pH is about 2.5 for 90 % adsorption without the hydrolysis of Fe(III). Adsorption equilibrium was attained within 60 min. The adsorption process can be described well by Langmuir model and pseudo-second-order kinetic equation, respectively. The maximum adsorption capacity for Fe(III) ions was found to be 1.4 mol/kg. The sulfenic acid, pectic acid, polyphenolic and alliin components contained in the garlic peel are inferred to be the main ligands responsible for the uptake of Fe(III) ions onto the gel. The simulated solutions referring to the hydrometallurgical process of nickel and copper were prepared to test the selective removal behavior of Fe(III), and the possibility of recovery and reuse of the adsorbed iron was also discussed. The present work may help to recycle and reuse the huge amount of iron resources in the real hydrometallurgical processes, and also bring a more ecofriendly, cleaner and shortened process for many traditional hydrometallurgical processes. | |||
TO cite this article:Xue Jiehao,Zhang Yangzhong,Meng Yeping, et al. Selective removal and recovery of Fe(III) by garlic residue gel adsorption[OL].[31 October 2018] http://en.paper.edu.cn/en_releasepaper/content/4746268 |
3. Removal of uranium from aqueous solution by graphene oxide | |||
YU Jing,WANG Jianlong | |||
Environmental Science and Techology 29 April 2017 | |||
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Abstract:In this paper, the adsorption of uranium by graphene oxide was investigated. The effect of pH, contact time, concentration of uranium and temperature on the adsorption capacity of uranium was determined. The graphene oxide (GO) was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and infrared spectra (FTIR). FTIR spectra indicated that carboxyl and alkoxy groups existed on the surface of GO, which involved in uranium adsorption. The adsorption kinetics of U(VI) followed pseudo first-order kinetic model. The adsorption isotherm conformed to Tempkin model. The adsorption process is spontaneous and exothermic. | |||
TO cite this article:YU Jing,WANG Jianlong. Removal of uranium from aqueous solution by graphene oxide[OL].[29 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4730928 |
4. 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 | |||
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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 |
5. Study the Adsorption of Humic Acid by Nano-amorphous Calcium Phosphate | |||
WEI Wei,JIANG Ling | |||
Environmental Science and Techology 18 April 2017 | |||
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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]. |
6. 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 | |||
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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 |
7. Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation | |||
TENG Long,XIE Bihuang,LI Xuchun | |||
Environmental Science and Techology 09 September 2016 | |||
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Abstract:The sulfite/UV process is an promising alternative to remediation of a wide variety of recalcitrant contaminants such as halogenated organic compounds by producing powerfully reducing species, hydrated electron (eaqˉ). This study was intended to assess the efficiency of the process and to optimize the system. Selecting monochloroacetic acid (MCAA) as the simple model compound, energy efficiency of the reductive dehalogenation by the process was assessed based on the degradation kinetics of MCAA. The energy efficiency was analyzed by taking into account both of the electric energy input and chemicals consumption. The energy efficiency generally increased with increasing UV dose while showing a parabolic profile with respect to S(IV) dosage. Thus, the process could be optimized by controlling UV dose and S(IV) dosage in tandem, and several optimization approaches were also proposed and discussed. The process still shows effects in reducing MCAA in the realistic surface water, and the efficiency EE/O for reductive dehalogenation was estimated to be about18.6 kWh m-3 order-1 by the sulfite/UV process, suggesting that the process was efficient and promising in destroying many recalcitrant contaminants. | |||
TO cite this article:TENG Long,XIE Bihuang,LI Xuchun. Efficiency assessment and optimization of the sulfite/UV process for reductive dehalogenation[OL].[ 9 September 2016] http://en.paper.edu.cn/en_releasepaper/content/4704345 |
8. 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 | |||
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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]. |
9. 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 | |||
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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 |
10. The Effect of Degree of Sulfonation of Sulfonated Poly(arylene ether sulfone) Membranes on the Microbial Fuel Cell Performance | |||
Bi Huiping,Ran Dongqin,Hu Zhaoxia,Chen Shouwen | |||
Environmental Science and Techology 03 June 2016 | |||
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Abstract:A series of sulfonated poly(arylene ether sulfone) (SPAES) membranes with different of degree of sulfonation (DS) are prepared for microbial fuel cell (MFC) applications. The performance of the MFCs equipped with SPAES membranes is investigated in details. During the start-up stage, the need time of reaching stable state and maximum anodic potential for the MFCs decreases with the increase of DS of the SPAES membranes. However, the power density of MFCs with SPAES(5-5), SPAES(4-6), SPAES(3-7) is very close after 14 days, which should be resulted from the combining effects of the exchange of H+ to Na+ in the SPAES membrane and the fouling of the membranes. The DS affects the anti-fouling activity of SPAES membranes, and higher DS leads to lower anti-fouling activity. The MFC equipped with SPAES(3-7) membrane (DS=30%, IEC=1.31 mmol g-1) is considered the better choice for the long-term operation. | |||
TO cite this article:Bi Huiping,Ran Dongqin,Hu Zhaoxia, et al. The Effect of Degree of Sulfonation of Sulfonated Poly(arylene ether sulfone) Membranes on the Microbial Fuel Cell Performance[OL].[ 3 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4695751 |
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