National Engineering Research Center for Organic Pollution Control and Resources Reuse

Nanjing, China

National Engineering Research Center for Organic Pollution Control and Resources Reuse

Nanjing, China

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Chen Y.,Nanjing University | Chen Y.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Pan B.,Nanjing University | Pan B.,Nanjing Forestry University | And 6 more authors.
Environmental Science and Technology | Year: 2010

A novel hybrid adsorbent D001-PEI was fabricated for selective Cu(II) removal by immobilizing soluble polyethyleneimine (PEI) nanoclusters within a macroporous cation exchange resin D001. Negligible release of PEI nanoclusters unexpectedly observed during operation may result from the porous cross-linking nature of D-001 as well as the electrostatic attraction between PEI and D001. Increasing solution pH from 1 to 6 results in more favorable Cu(II) retention by D001-PEI, and Cu(II) adsorption onto D001-PEI follows the Langmuir model and the pseudosecond-order kinetic model well. Compared to the host cation exchanger D001, D001-PEI displays more preferable adsorption toward Cu(II) in the presence of competing Mg2+, Ca2+, Sr2+ at greater levels in solution. Fixed-bed adsorption runs showed that Cu(II) sequestration on D001-PEI could result in its conspicuous decrease from 5 mg/L to below 0.01 mg/L. Also, the spent hybrid adsorbent can be readily regenerated by 6-8 BV HCl (0.2 mol/L)-NaCl (0.5 mol/L) binary solution for repeated use with negligible capacity loss. The results reported herein validate that D001-PEI is a promising adsorbent for enhanced removal of Cu(II) and other heavy metals from waste effluents. © 2010 American Chemical Society.


Song H.,Nanjing University | Song H.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Song H.,Nanjing University of Technology | Yao Z.,Nanjing University | And 8 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

In order to quickly remove nitrate from aqueous solution, a magnetic strong base quaternary ammonium anion exchange resin (MAER) has been successfully designed and synthesized. The physicochemical properties of the MAER as well as its adsorption ones for nitrate removal were investigated in detail. A series of batch experiments were carried out to evaluate the effects of several factors on removal efficiency of nitrate, such as retention time, resin amount and initial nitrate concentration. Compared to the commercial Purolite A300 and D213, the equilibrium time for the adsorption process using MAER was only around 20min, which is significantly less than that of two ones mentioned. Furthermore, the kinetic process of nitrate sorption on MAER could be well described by both pseudo-first-order and pseudo-second-order models. In addition, the results of batch experiments can be better fitted by the Langmuir and Freundlich adsorption isotherm models. Most importantly, the effects of competing ions on nitrate removal followed the order as: SO4 2->Cl->HCO3 -. These results are of significance in guiding the development of novel resins with the rapid nitrate removal rate from aqueous solution, which would improve efficiency and save energy greatly. © 2013.


Song H.,Nanjing University | Song H.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Song H.,Nanjing University of Technology | Wu Y.,Nanjing University | And 8 more authors.
Electrochimica Acta | Year: 2016

Capacitive deionization (CDI) is an emerging technology that supplies deionized water to resolve the fresh water shortage. CDI electrodes are mainly made up of carbon materials, of which the deionization performance is closely related to their physical properties and structures. Hence, a rational design of electrode material structure is essentially significant. Functionalized graphene (fG) in particular has recently been regarded as characteristic CDI electrode material. However, preparation of fG based on graphene oxide usually results in serious secondary pollution due to usage of highly poisonous chemicals, and thus still cannot meet the demand of practical application. It is feasible that environmentally-friendly activated carbon (AC) and small amounts of fGs can be combined rationally, and used as CDI electrodes. Here, sono-assembled AC/m-phenylenediamine (mPEA) or p-phenylenediaminefG inter-connected network architecture has been constructed for the first time successfully. The specific capacitances of the AC/fG composites were found to be significantly higher than that of the AC electrode owing to mesoporous generation. Also, among all the samples, the AC composite with 5 wt % mPEA-fG exhibited an ultrahigh electrosorption capacity of 12.58 mg/g (or 0.22 mmol/g) in NaCl solution. These observations indicate that fG can serve as an efficient conductive bridge to decrease the aggregation of AC particles, and improve the electron transfer with the composite electrode. This work provides an effective strategy for the environmental and economical electrode architectures for general applications in CDI and energy storage. © 2016 Elsevier Ltd. All rights reserved.


Song H.O.,Nanjing University | Song H.O.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Zhou Y.,Nanjing University | Zhou Y.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | And 4 more authors.
Chinese Chemical Letters | Year: 2012

An anion exchange resin NDP-5 has been prepared successfully and applied on the selective removal of nitrate from SO 4 2-/NO 3 - binary co-existence system. The composition and morphology of NDP-5 were confirmed by FT-IR and SEM. The NDP-5 resin exhibits the completely different behavior on the adsorption capacity, adsorption kinetic and the effect of the completing anion in the absence or presence of sulfate, compared to D213. And, the resultants of kinetic are well fitted by the pseudo-first-order and pseudo-second-order models. These results are very important to develop novel resins with great features. © 2012 Ai Min Li.


Wang B.,Nanjing University | Wu Y.,Nanjing University | Jiang B.,Nanjing University | Song H.,Nanjing University | And 10 more authors.
Electrochimica Acta | Year: 2016

Electro-reduction is a promising method to pretreat anti-oxidative and bio-refractory wastewater. 2-Nitrotoluene (2-NT) was chosen as the probe compound to investigate the electro-reduction process. The electro-reduction of 2-NT is a diffusion-controlled process according to cyclic voltammograms of 2-NT at the Ti electrode. The reductive activation of [H] contributed to 2-NT removal and 2-toluidine formation in the electro-reduction process. The influence of several operating parameters, such as current density, electrolyte concentration, initial pH value, and initial concentration of 2-NT was investigated using a multifactor orthogonal experiment. Current density and initial 2-NT concentration were significant factors that influenced 2-NT removal efficiency. Although pH was not a significant factor for 2-NT removal efficiency, it significantly influenced the 2-toluidine formation efficiency. The kinetics of 2-NT removal followed a pseudo-first-order reaction. It was clear that the reduction of 2-NT could be enhanced by adding the current density. However, 10 mA cm−2 was selected as the working current density in subsequent experiments to reduce energy consumption. 2-Nitrosotoluene, 2-toluidine, azotoluene, and azoxytoluene were the transformation products detected in the system by gas chromatography/mass spectrometry (GC/MS) and the pathway of the reduction of 2-NT on Ti cathode was proposed. In the pretreatment of Nitroaromatic compounds (NACs) containing wastewater, the electro-reduction-oxidation process was superior to the electro-oxidation process according to the improvement of water quality. Thus, the electro-reduction-oxidation process can reach high efficiency for treatment of toxic NACs containing wastewater under mild conditions. © 2016 Elsevier Ltd


Long C.,Nanjing University | Long C.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Li Q.,Nanjing University | Li Y.,Nanjing University | And 5 more authors.
Chemical Engineering Journal | Year: 2010

The benzene and chlorobenzene is the representative of VOCs and widely exist in the industrial waste gas. In this paper, the removal characteristics of benzene and chlorobenzene vapor using a microporous hypercrosslinked polystyrene adsorbent (HPsorbent) were studied. The HPsorbent had the similar equilibrium adsorption capacities for benzene and chlorobenzene vapors with commercial granular activated carbon (GAC). The breakthrough adsorption capacities of benzene and chlorobenzene in the single and binary vapor system were also investigated. Although there exist a competitive adsorption between benzene and chlorobenzene vapors on HPsorbent, benzene and chlorobenzene removals of above 99% in the both system was attained before significant breakthrough occurred. On the other hand, a pilot-scale experiment was carried out to investigate the effectiveness of using HPsorbent to remove benzene-chlorobenzene vapors mixture from industrial byproduct hydrogen chloride gas. The results show that the hydrogen chloride gas did not have an adverse effect on the adsorption of benzene and chlorobenzene. In sum, HPsorbent should be potentially an effective adsorbent for removal of benzene-chlorobenzene vapors not only from air stream but also from hydrogen chloride gas. © 2010 Elsevier B.V.


Xu Z.,Nanjing University | Zhang W.,Nanjing University | Zhang W.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Lv L.,Nanjing University | And 3 more authors.
Environmental Science and Technology | Year: 2010

In the present study, a novel approach was developed to remove dimethyl phthalate (DMP), a representative phthalic acid ester (PAE) pollutant, from an aqueous solution using a macroporous OH-type strong base anion exchange resin D201-OH. As compared to the traditional catalyst aqueous NaOH, D201-OH displayed much higher catalytic efficiency for DMP hydrolytic degradation. Almost 100% of DMP was hydrolyzed to far less toxic phthalic acid (PA) in the presence of D201-OH, while only about 29% of DMP was converted to PA in the presence of NaOH under the identical amount of hydroxyl anions in the reaction system. More attractively, the hydrolysis product PA also can be simultaneously removed by the solid basic polymer D201-OH through a preferable anion exchange process, while NaOH induced hydrolysis products were still left in solution. The underlying mechanism for the hydrolytic degradation and simultaneous ion exchange removal process was proposed. Fixed-bed column hydrolytic degradation and ion exchange removal tests indicate that DMP can be completely converted to PA and subsequently removed from water without any further process, with pH values of the effluent being around 6 constantly. The exhausted D201-OH was amenable to an efficient regeneration by 3 bed volumes (BV) of NaOH solution (2 mol/L) for repeated use without any efficiency loss. The results reported herein indicated that D201-OH-induced catalytic degradation and removal is a promising approach for PAEs treatment in waters. © 2010 American Chemical Society.


Wang J.,Nanjing University | Li H.,Nanjing University | Li H.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Shuang C.,Nanjing University | And 6 more authors.
Microporous and Mesoporous Materials | Year: 2015

A series of magnetic anion exchange resins (ND-1, ND-2 and ND-3) with different pore structure were prepared for ibuprofen (IBU) adsorption by using different amount of cyclohexanol as porogen in this work. For adsorption kinetics, resins with larger pore structure showed faster adsorption rates and higher equilibrium adsorption capacities because the internal diffusion process was facilitated by the increase of pore diameter and pore volume. As for adsorption isotherms, the experimental data was better fitted by Freundlich model especially for the resins with broader pores, suggesting that heterogeneous interactions took place in pores. The counter ion released by resin was measured, and ratios of equilibrium adsorption capacity to the counter ion were between 1.22 and 1.56, which confirmed that adsorption process was predominantly attributed to ion exchange while other interactions also existed. Hence, the co-existent anion reduced the adsorption amount of IBU onto resin by competing adsorption in ion exchange process, and the optimal pH ranged from 6 to 8. Resins with more open structure showed better regeneration abilities, of which the adsorption amounts witnessed no significant decrease during 7 circles of use, indicating the advantages of larger pore canal in the adsorption and regeneration behavior. © Elsevier Inc. All rights reserved.


Song H.,Nanjing University | Song H.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Zhou Y.,Nanjing University | Zhou Y.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | And 4 more authors.
Desalination | Year: 2012

An anion exchange resin (NDP-2) was synthesized for selective nitrate removal in the binary co-existence systems. The characterization of NDP-2 have been performed by FT-IR, SEM and BET surface area analyses. The results showed that the amounts of nitrate sorbed onto NDP-2 were the highest compared to D201 and Purolite A 300 (A 300) resin at equilibrium, and its sorption behavior followed the Langmuir adsorption isotherm model well. Furthermore, both the pseudo-first order and the pseudo-second order kinetic models showed well fitting about the process of nitrate sorbed onto NDP-2 resin. Attractively, NDP-2 resin demonstrated the more preferable absorption toward nitrate than the commercial D201 and Purolite A 300 in the presence of competing ions, such as SO 4 2-, Cl - and HCO 3 -, in aqueous solution. Therefore, NDP-2 resin would be a promising adsorbent to improve removal of nitrate from contaminated drinking water resources. © 2012 Elsevier B.V.


Xu Z.,Nanjing University | Zhang W.,Nanjing University | Zhang W.,National Engineering Research Center for Organic Pollution Control and Resources Reuse | Pan B.,Nanjing University | And 2 more authors.
Environmental Technology | Year: 2011

To study the adsorptive separation efficiency, adsorption and desorption performances of diethyl phthalate (DEP) were investigated with a functional polymer resin (NDA-702). A macroporous polymer resin (XAD-4) and a coal-based granular activated carbon (AC-750) were chosen for comparison. The kinetic adsorption data obeyed the pseudo-second-order rate model, and the adsorption processes were limited by both film and intraparticle diffusions. Adsorption equilibrium data were well fitted by the Freundlich equation, and the larger uptake and higher selection of NDA-702 than AC-750 and XAD-4 was probably due to the microporous structure, phenyl rings and polar groups on NDA-702. Thermodynamic adsorption studies indicated that the test adsorbents spontaneously adsorbed DEP, driven mainly by enthalpy change. Continuous fixed-bed runs demonstrated that there no significant loss of the resin's adsorption capacity and there was complete regeneration of NDA-702. The results suggest that NDA-702 has excellent potential as an adsorption material for water treatment. © 2011 Taylor & Francis.

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