Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUT

Guangzhou, China

Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUT

Guangzhou, China
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Liang X.,South China University of Technology | Chen X.,South China University of Technology | Zhang J.,South China University of Technology | Shi T.,South China University of Technology | And 6 more authors.
Atmospheric Environment | Year: 2017

Increasingly serious ozone (O3) pollution, along with decreasing NOx emission, is creating a big challenge in the control of volatile organic compounds (VOCs) in China. More efficient and effective measures are assuredly needed for controlling VOCs. In this study, a reactivity-based industrial VOCs emission inventory was established in China based on the concept of ozone formation potential (OFP). Key VOCs species, major VOCs sources, and dominant regions with high reactivity were identified. Our results show that the top 15 OFP-based species, including m/p-xylene, toluene, propene, o-xylene, and ethyl benzene, contribute 69% of the total OFP but only 30% of the total emission. The architectural decoration industry, oil refinery industry, storage and transport, and seven other sources constituted the top 10 OFP subsectors, together contributing a total of 85%. The provincial and spatial characteristics of OFP are generally consistent with those of mass-based inventory. The implications for O3 control strategies in China are discussed. We propose a reactivity-based national definition of VOCs and low-reactive substitution strategies, combined with evaluations of health risks. Priority should be given to the top 15 or more species with high reactivity through their major emission sources. Reactivity-based policies should be flexibly applied for O3 mitigation based on the sensitivity of O3 formation conditions. © 2017 Elsevier Ltd


Liang X.-M.,South China University of Technology | Zhang J.-N.,South China University of Technology | Chen X.-F.,South China University of Technology | Shi T.-L.,South China University of Technology | And 7 more authors.
Huanjing Kexue/Environmental Science | Year: 2017

A reactivity-based anthropogenic volatile organic compounds (VOCs) emission inventory in China in 2010 was developed on the basis of ozone formation potential (OFP), using the latest VOCs emission inventory, source profiles and maximum incremental reactivity (MIR) values. The results showed that the total anthropogenic OFP was 84187.61 kt in China in 2010, of which 6 882.53 kt was from alkanes, 41496.92 kt from alkenes/alkynes, 32945.32 kt from aromatic hydrocarbons, 161.45 kt from halocarbons, and 2701.40 kt from oxygenated organics. The top 10 species in terms of OFP consisted of propene, ethene, m/p-xylene, toluene, 1-butene, o-xylene, 1,2,4-trimethyl benzene, 1,3-butadiene, m-ethyl toluene and ethyl benzene, contributing 63.95% to the total OFP but only 31.84% to the mass-based emission. Industrial sources accounted for the largest (49.29%) of the total OFP, followed by transportation sources (28.31%) and agricultural sources (22.40%). The key industrial sources with high reactivity were architectural decoration industry, oil refinery industry, storage and transport, machinery equipment industry, transport equipment industry and printing. Passenger cars, motorcycles and heavy duty vehicles were the major OFP sources of transportation. The two biomass burning sources were both the key OFP sources of agriculture. Shandong, Jiangsu, Guangdong, Zhejiang and Henan were the top five provinces with contributions of 39.65% of the total OFP in China. The reactivity-based emission inventory in this study would be of great significance for the formulation of reactivity-based ozone (O3) control strategies in China. © 2017, Science Press. All right reserved.


Sun X.,South China University of Technology | Peng R.,South China University of Technology | Li S.,South China University of Technology | Liang X.,South China University of Technology | And 8 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2017

A series of Pt-x nanoparticles with different sizes (x=1.41, 1.57, 1.79, 1.95, 2.12 and 2.32 nm) were successfully synthesized by polyol reduction method and loaded onto CeO2-rod. These Pt-x/CeO2-rod samples were tested in the catalytic oxidation of toluene. The results indicated that the catalysts activity exhibited a volcano-shaped curve with respect to Pt particle size and Pt-1.79/CeO2-rod showed the highest catalytic activity with T90=133℃. Commonly, an increased Pt particle size leads to a lower dispersion and worse catalytic performance. However, in this study, the activity of Pt/CeO2 samples first increased and then decreased with the growth of Pt particle size. Moreover, the TOF calculated by the amount of exposed Pt atoms also increased with Pt size. UV Raman, XRD and XPS results showed increasing surface oxygen vacancies concentration along with increasing Pt particle sizes. The increase of surface oxygen vacancies accelerated the lattice oxygen transfer effectively and promote the adsorption and activation process of oxygen. Therefore, it could be concluded that the catalytic oxidation of toluene activity on Pt/CeO2 catalysts was a combined effect of Pt dispersion and CeO2 surface oxygen vacancies concentration. © 2017, Science Press. All right reserved.


Wang K.,South China University of Technology | Wang K.,Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUT | Zhao J.,South China University of Technology | Fu M.,South China University of Technology | And 4 more authors.
Aerosol and Air Quality Research | Year: 2013

In recent years a number of mechanisms for the preparation of ordered mesoporous carbons (OMCs) have been proposed for different systems. However, the exact preparation mechanism for the soft template method remains unclear, which seriously inhibits the further design and development of OMC materials on the molecular level, as well as better understanding of the related structure-activity relationship and their wider application. To clarify the mechanisms involved in the preparation of OMCs via the soft-template method, experimental and molecular simulation studies were performed in this work. First, OMCs were prepared using a triblock copolymer Pluronic F127 as the template and phenolic resin as the carbon source. These OMCs were characterized using X-ray diffraction (XRD), N2 adsorption-desorption and transmission electron microscopy (TEM), and the results show that the OMCs have well-ordered 2D-hexagonal structures and narrow pore size distributions. Additionally, the dissipative particle dynamics (DPD) method was carried out to investigate the phase behavior and self-assembly process of the F127/phenolic resin/ethanol system. The simulation results show that F127 could self-assemble a series of stable micellar structures at different concentrations, such as spherical, cylindrical, lamellar, body-centered cubic and cubic perforative ones. These micellar structures, similar to the template used in the experiment, controlled the structure of phenolic resin in ethanol solution, while the introduction of phenolic resin did not affect the selfassembled structure of F127. An investigation of the dynamic formation process involved in production of the cylindrical micelles indicates that the system transformed from a homogeneous state into the typical stable micellar structures due to their amphiphilic properties, which explains why cylindrical and uniform mesopores of OMCs were experimentally obtained. This work deepens our understanding of the mechanisms involved in the preparation of OMCs on a mesoscopic level. It also demonstrates that the DPD method is effective for studying the self-assembly of polymer systems, and provides useful guidance for the fabrication of novel materials. © Taiwan Association for Aerosol Research.


Wu Z.,South China University of Technology | Zhang L.,Guangdong Polytechnic | Guan Q.,Kunming University of Science and Technology | Ning P.,Kunming University of Science and Technology | And 3 more authors.
Chemical Engineering Journal | Year: 2014

In order to prevent the reunion of reduced graphene oxide (rGO) during storage, α-zirconium phosphate (ZrP) was used as the modifier, and a peculiar adsorbent of ZrP-pillared rGO (rGO-ZrP) was prepared. The features of rGO-ZrP were characterized by using Fourier transform infrared (FTIR), scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersion X-ray (EDX) spectrometer, atomic force microscopy (AFM) and X-ray diffraction (XRD) measurements. Then, rGO-ZrP was employed as the adsorbent and the adsorption characteristics of rGO-ZrP toward methylene blue (MB) were evaluated under laboratory conditions. The results showed that rGO-ZrP possessed a higher BET specific surface area relative to rGO. The maximum adsorption quantity of MB onto the new prepared rGO-ZrP was ~1.38. g/g at 30. °C. With the increase of storage day, the BET specific surface area and the maximum adsorption capacity of rGO-ZrP approximately remained unchanged. Under the maximum adsorption capacity, the adsorption quantity of MB onto rGO-ZrP was dependent on the initial concentration of MB, and higher temperature could facilitate the adsorption process. The efficiency of rGO-ZrP almost remained constant during the first six cycles of adsorption-desorption process. In addition, the fluorescence spectra implied that the adsorption of MB onto rGO-ZrP was a π-π stacking adsorption process, and the pillared structure of rGO-ZrP greatly enhanced the noncovalent adhesion. In conclusion, rGO-ZrP could serve as a promising adsorbent for the removal of MB in waste water. © 2014.


Liao Y.,South China University of Technology | Liao Y.,Xinjiang University | He L.,South China University of Technology | Man C.,Stevens Institute of Technology | And 10 more authors.
Chemical Engineering Journal | Year: 2014

Ceria nanorods with various aspect ratios were successfully synthesized by a convenient hydrothermal method without any templates or surfactants. The samples were characterized by TEM, HRTEM, XRD, N2 adsorption/desorption, XPS, Raman and H2-TPR. The results showed that the diameter and length of the ceria nanorods were determined by the concentration of NaOH solution and the hydrothermal reaction time, respectively. In addition, the diameter-dependent catalytic activity for abatement of toluene had been found over the nanorods with various aspect ratios. The thinner nanorods presented higher catalytic activity owing to the existence of more Ce3+ ions and more oxygen vacancy sites on the surface. Over the thinnest nanorods, the most active catalyst, three consecutive runs in toluene oxidation and a longstanding oxidation test running at 380°C for 100h were also carried out. © 2014 Elsevier B.V.


Wu Z.,Guangdong Polytechnic | Wu Z.,South China University of Technology | Zhang L.,Guangdong Polytechnic | Guan Q.,Kunming University of Science and Technology | And 7 more authors.
Materials Research Bulletin | Year: 2015

Abstract Au-Co supported on mesoporous silica materials SBA-15 was prepared with about 15 wt.% cobalt then deposition-precipitation with 2 wt.% Au. The results showed that while SBA-15 provided the long ordered arrangement of the channels for support, mixtures of cobalt oxides and gold nanoparticles are dispersed in the mesoporous channels. The sample exhibited excellent catalytic activity for toluene combustion, a complete decomposition (about 100%) of toluene had been achieved at the reaction temperature over 573 K and space velocity 30,000 h-1. The kinetics showed that the activation energy of the sample was 96.06 kJ/mol (22.96 kcal/mol) and frequency factor was 1.05 × 1010 s-1, respectively. All these results indicate that while mesoporous materials give a high surface area support for metals, cobalt offers active supports for gold particles, which might be a combined way to overcome the shortcomings of low specific area for reducible transition metal oxides and low activity for inert oxides. Crown Copyright © 2015 Published by Elsevier Ltd.


Liao Y.,South China University of Technology | Liao Y.,Xinjiang University | Fu M.,South China University of Technology | Fu M.,Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUT | And 13 more authors.
Catalysis Today | Year: 2013

Nanorod-structured Mn-Ce mixed oxides with various content of Mn were synthesized successfully. The resulting materials were characterized by SEM, TEM, HRTEM, EDX, XRD, BET, XPS, Raman, O2-TPD and H2-TPR. Mn-Ce mixed oxides nanorods with high content of Mn displayed the best catalytic activity and high stability. The formation of the solid solution between manganese and cerium oxides, giving rise to more Mn4+ and oxygen vacancies, was crucial in maintaining the high activity and stability, involving the participation of the induced mobile lattice oxygen. Thus, the catalytic activity of the single metal oxide with certain morphology could be further enhanced by doping the active component to form the mixed oxides that kept with the unchanged shape, despite of their lower surface area. © 2013 Elsevier B.V.


Lu M.,South China University of Technology | Huang R.,South China University of Technology | Wu J.,South China University of Technology | Wu J.,Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control SCUT | And 6 more authors.
Catalysis Today | Year: 2015

FeOx/SBA-15 catalysts were prepared via impregnation and utilized for toluene removal in dielectric barrier discharge (DBD) plasma at atmospheric pressure and room temperature. Toluene removal was investigated in the environment of various mixed N2/O2 plasmas, showing that toluene removal efficiency and COx selectivity were greatly increased by FeOx/SBA-15 and that the organic intermediates were greatly reduced by catalysts. In pure N2 plasma, the bulk oxygen in the catalyst was involved in the toluene oxidation, and the 3%FeOx/SBA-15 catalyst showed the optimal toluene oxidation activity. The catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR) and O2 temperature-programmed desorption (O2-TPD), showing that toluene oxidation was closely related to the highly dispersed nature of iron on the SBA-15 surface, the reduction temperature of Fe2+ and the oxygen adsorption ability of the catalyst. The pathways of toluene decomposition in the combination of FeOx/SBA-15 with a non-thermal plasma (NTP) system were proposed based on the identified intermediates. © 2014 Elsevier B.V. All rights reserved.


Peng R.,South China University of Technology | Sun X.,South China University of Technology | Li S.,South China University of Technology | Chen L.,South China University of Technology | And 7 more authors.
Chemical Engineering Journal | Year: 2016

The present work elucidated the shape effect of Pt/CeO2 catalysts toward catalytic oxidation of toluene. CeO2 nanorods, nanoparticles, and nanocubes, dominantly exposed {1 1 0}, {1 1 1}, and {1 0 0} facet, respectively, were employed to immobilize Pt nanoparticles with tunable size by the adsorption method. The catalytic oxidation of toluene was evaluated. Their catalytic performance shows significantly support-shape-dependent behaviour, and the Pt/CeO2-r sample exhibits the best catalytic activity due to the best reducibility and highest concentration of surface oxygen vacancies. Furthermore, two types of TOFs based on the Pt dispersion and the concentration of surface oxygen vacancies were calculated, and the results suggest the oxygen vacancies on ceria surface control the reaction rate. In addition, in-situ UV Raman spectroscopy demonstrates that the supply of active oxygen controls the reaction rate and the surface oxygen vacancies play the role to replenish active oxygen species from gaseous phase and accelerate oxygen cycle for the toluene oxidation. © 2016 Elsevier B.V.

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