CHEMOSPHERE
·
2022
·
IF 8.943
Hongyu Lu,Chengxun Deng,Zhimin Yu,Dianya Zhang,Weiping Li,Jun Huang,Teng Bao,Xiaowei Liu
Plasma techniques to degrade pollutants are generally more efficient than conventional methods, but exist some problems such as high energy consumption, incomplete degradation of pollutants, and secondary pollution caused by highly toxic intermediates. In this study, the dielectric barrier discharge plasma (DBDP) combined with the Ti-based metal organic frameworks (MOFs) catalysts (P25/NH 2 -MIL-125(Ti)) was used to degrade fluorene in the soil. The synergistic treatment technique used in soil remediation can realize a green and promising treatment efficiency with relatively low energy consumption. Compared with DBDP system alone, the synergetic treatment system of DBDP and P25/NH 2 -MIL-125(Ti) considerably increased the degradation efficiency of fluorene in the soil to above 90% at 10 min, even with a relatively low discharge voltage (5 kV). The synergistic treatment system achieved 88.8% of fluorene mineralization at 60 min. Optical emission spectroscopy and electron paramagnetic resonance spectroscopy both showed that •OH and •O 2 − played an important role in the synergetic treatment system. Nine main intermediates were identified using gas chromatography-mass spectrometry and Fourier transform infrared analysis. The main degradation of fluorine in soil was caused by the electronic transition of the catalytic material excited by DBDP, and finally mineralized into CO 2 and H 2 O. The fluorene and its toxic intermediates were effectively removed. This study provides an insight for achieving high efficiency and environmentally friendly application perspective in soil remediation.
研究领域:
环境科学
·
土壤学
·
等离子体技术
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Lu Mao,Jiaojun Shen,Xiaoliang Ma,Zhonghui Lan,Xu Zhang
Photocatalytic degradation of 2,4-dinitrophenol in two commercial TiO2 (Degussa P25 and Hombikat UV-100) was investigated in this work. The properties of two TiO2 were systematically studied and described in detail. The observed photoactivity of Degussa P25 was 6–12 times higher than Hombikat UV-100 although the specific surface area of Hombikat UV-100 was 5.7 times more than that of Degussa P25. The photodegradation of 2,4-dinitrophenol was favored at neutral pH in Degussa P25, while its degradation was preferred at pH 3.0 in Hombikat UV-100 dispersion. The observed kinetic constant (kobs) for the photodegradation of 2,4-dinitrophenol in 20 mg/L humic acid solution was found to be 15% (Degussa P25) and 21% (Hombikat UV-100) of the values obtained from the corresponding pure aquatic solutions. The suppression effects of β-cyclodextrin on the photodegradation of 2,4-dinitrophenol over Degussa P25 (50%) was much more significant than that of Hombikat UV-100 because of the different adsorption behavior of β-cyclodextrin over two TiO2. Hydroxyl radical and valance band hole was found to be the predominant reactant during the degradation of 2,4-dinitrophenol using P25 and UV-100, respectively. Formic acid, acetic acid, oxalic acid, and were detected as advanced oxidation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wei Chao,Ying Pengzhan,Qiang Yinghuai,Xia Qingrui,Gu Xiuquan
In this study, the titanium dioxide is prepared at 353 K in one hour using a one-step method. The titanium dioxide prepared using this method consists of anatase clusters with sizes of approximately 5 nm. We find that it has a specific surface area of 504 m 2 /g, the average pore diameter of a stacking hole was 71 A, and the band gaps were approximately 3.25 eV. The photocatalytic activity and stability of the titanium dioxide prepared using this method on methyl orange and rhodamine B was as good as that of P25. This method may have a grander prospect for the industrial production of the photocatalyst due to its property of convenience and energy-saving.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Zhongyi An,Yuqun Zhuo,Chao Xu,Changhe Chen
Mn-based catalysts impregnated on TiO 2 with different crystalline phases (rutile (R), anatase (A), and P25 (P)) were studied for the oxidation of NO to NO 2 . 10%MnO x /TiO 2 (P) was the most active catalyst, giving 83% of NO conversion at 300 °C and a GHSV of 20000 h −1 . The catalyst activities were in the order MnO x /TiO 2 (P) > MnO x /TiO 2 (A) > MnO x /TiO 2 (R). The catalysts were characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, H 2 temperature-programmed reduction, and O 2 temperature-programmed desorption. Compared to anatase and rutile, P25 gave better dispersion of MnO x on the support surface, suppressed the agglomeration of catalyst particles, and also produced more Mn 2 O 3 , which was more active for the oxidation of NO. In addition, P25 enhanced the reduction of MnO x , especially for Mn 2 O 3 , and the formation of easily desorbed O 2 − generated from the Mn 3+ –O bond.
研究领域:
催化化学
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 38
·14194-14201
·
IF 8.067
Lilai Sun,Lu Han,Na Li,Pengbo Wang,Mingyue Wang,Xudong Luo,Xibao Li
Cu2O has begun to show its charm and gain popularity in various photoelectrochemical (PEC) processes, but fast charge recombination and photochemical instability always limit its PEC water splitting activity and stability. Furthermore, H2O wetting on the Cu2O photocathode is the premise for PEC reaction, while research on carrier separation, photostability and still wettability has not been brought to the forefront. Herein, a self-polymerized dopamine coating is employed to directly anchor TiO2 (P25) on the surface of a Cu2O film electrode; nanoscale particles facilitate polydopamine (PDA) conformal assembly on Cu2O polyhedra. A ternary Cu2O/PDA/TiO2 composite photocathode is obtained and shows boosted PEC activity and stability. The advantages of this unique design are mainly reflected in three aspects: (1) the married heterojunction of TiO2/Cu2O provides a persistent driving force for charge separation by PDA natural adhesive properties; (2) the conversion of hydrophobicity–hydrophilicity is achieved to improve the wettability of the Cu2O film electrode assisted by conformal PDA coating; (3) the improvement of PEC stability is due to the inhibition of Cu2O photocorrosion covered by the PDA shelter. This advance bodes well for the development of the PEC field founded on multifunctional PDA.
研究领域:
材料科学
·
能源科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yarui Wang,Chengzhuo Yu,Sen Wang,Jin Xu,Fanglan Geng,Silong Wang,Jitao Lv,Lixia Zhao,Yawei Wang
Humic acids (HA) released during algal bloom poses a key challenge for efficient photocatalytic degradation of Microcystin-LR (MC-LR) due to their scavenging function on active species. Herein, MIL-101(Fe)/TiO 2 -P25 (M/P) was constructed to diminish the inhibitory effect of HA on the photocatalytic degradation of MC-LR. Results showed that MC-LR could be efficiently removed assigning to the photogenerated holes (h + ) and superoxide radical (O 2 •− ) oxidation under visible light irradiation, where the carboxy groups of D -glutamic acid (Glu) and methyl- D -aspartic acid (MeAsp), and Adda side chain related to MC-LR biotoxicity were selectively destroyed to achieve MC-LR detoxication. More importantly, HA exerted non-inhibitory effect on MC-LR removal by M/P. The counteracting mechanisms were studied. Firstly, the location of TiO 2 in the pore structure of MIL-101(Fe) could occupy the adsorption sites of HA, and decrease the HA adsorption on M/P. Furthermore, XPS analyses suggested the coordination of unsaturated Fe metal sites on the surface of M/P hybrids complexed with –OH and –COOH of HA, which could accelerate the electron transfer and reduce hole consumption. Thus, the inhibitory effect of HA was alleviated during photocatalytic MC-LR treatment. This work offers a possible way to remove MC-LR in an abundant HA matrix water system efficiently.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Dongxue Lei,Xiaowen Xie,Yongjie Xiang,Xiongfei Huang,Fei Xiao,Jianping Cao,Guangqing Li,Dennis Y.C. Leung,Haibao Huang
The elimination of volatile organic compounds (VOCs) via vacuum ultraviolet (VUV) photolysis is greatly limited by low removal efficiency and gaseous byproducts generation, while photocatalytic oxidation of VOCs suffers from catalytic deactivation. Herein, a coupled process of gaseous VUV photolysis with aqueous photocatalytic oxidation with P25 as the catalyst was firstly proposed for efficient aromatic VOCs removal (VUV/P25). The removal efficiency of toluene reached 86.2% in VUV/P25 process, but was only 33.6% and 58.1% in alone gaseous VUV photolysis and aqueous ultraviolet photocatalytic oxidation (UV/P25) process, respectively. Correspondingly, the outlet CO 2 concentration in VUV/P25 process reached 132 ppmv. Toluene was firstly destructed by high-energy photons generated from gaseous VUV photolysis, resulting in its incomplete oxidation to form soluble intermediates including acids, aldehydes, esters. These soluble intermediates would be further degraded and mineralized into CO 2 in subsequent aqueous UV/P25 process. Notably, the concentrations of intermediates in VUV/P25 were much lower than those in VUV photolysis, indicating the synergy effect of VUV photolysis and UV/P25 process. The stability tests proved that VUV/P25 process maintained an excellent toluene degradation performance and P25 did not suffer from catalytic deactivation. In addition to toluene, the VUV/P25 system also achieved the efficient and sustainable degradation of styrene and chlorobenzene , suggesting its good application prospect in industrial VOCs treatment. This study proposes an efficient and promising strategy for deep oxidation of multiple aromatic VOCs in industries.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 24
·期 2
·315-320
·
IF 1.174
Yao Zhenxing,Wang Mingquan,Sun Shaohua,Jia Ruibao,Li He
Carbon tetrachloride (CCl 4 ) is a kind of toxic and persistent groundwater contaminant. Considering keeping drinking water safe, a novel kind of N-doped graphene (NGS)-P25 TiO 2 photocatalyst was prepared by a facile one-step hydrothermal method for the removal of CCl 4 from contaminated water. Simultaneously, nitrogen-doping and the reduction of graphene oxide, and loading of P25 were finished during the same process. The photocatalytic efficiency of resulted NGS-P25 nanoparticles was studied for the degradation of CCl 4 . The results indicated that NGS-P25 exhibited the highest photocatalytic activity under UV light irradiation, outperforming graphene-P25, bare P25 or NGS. The effects of NGS-P25 dosage, irradiation time, CCl 4 concentration and pH on CCl 4 photocatalytic degradation efficiency were discussed in detail. Accordingly, the optimum experimental conditions were obtained. Moreover, the high performance photocatalyst of NGS-P25 can be extended to environmental pollution control and remediation towards various pollutants.
研究领域:
环境科学
·
材料科学
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Nannan Geng,Wei Chen,Hang Xu,Mingmei Ding,Zongli Xie,Anqi Wang
Because of the unique advantages, ultrasound (US) has become a popular technology for water organic treatment. In order to compensate for the disadvantages of expensive equipment and large energy input caused by US, researchers combine US with iron-based sono-catalyst to realize the rapid and efficient degradation of pollutants. Aiming at the ultrasonic hot spot and sonoluminescence effect, in this work, Z-type heterojunction sono-catalyst Fe II -MIL-88B/GO/P25 (Fe II -MGP) was synthesized for TC-HCl removal. The physicochemical properties of the material were characterized by SEM, XRD , XPS and BET. The addition of GO contributed to the formation of the Z-Scheme heterojunction. At the optimal reaction conditions determined by influential factor experiments (ultrasonic power of 100 W, sono-catalyst dose of 0.3 g/L, H 2 O 2 dose of 20 mM and pH 5), in only 7 min, 83.3 % of TC-HCl was removed, and the TOC degradation efficiency reached 52.2 %. The contrast experiment demonstrated that the US/Fe II -MGP/H 2 O 2 system had the best pollutant removal performance. After three repeated experiments, the removal efficiency decreased by only 6 %. ∙OH was identified as the major radical from the quenching experiments and technical EPR. UV–vis and Mott-Schottky measurements suggested that the possible carrier transfer paths followed the Z-Scheme heterojunction model.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 6
·3049-3056
·
IF 2.961
Xu Bozheng,Wang Liying,Li Xuesong,Yang Xijia,Lü Wei
While transparent photoanode is highly desired for energy devices, its performance is still far from expectation. In the present work, a facile strategy was developed to prepare transparent TiO 2 films as photoanodes of quantum dot–sensitized solar cells (QDSSCs). Different TiO 2 nanoparticles (P25, rutile, anatase) were dispersed in C 16 H 36 O 4 Ti included solution and spin-coated on FTO glass, which is followed by sintering. The as-prepared TiO 2 films were used as photoanodes of QDSSCs. It has been shown that QDSSCs assembled by TiO 2 film prepared by P25 and N-butyl titanate slurry achieved the best performance. The transparency could be controlled by coating times, and the three-layer TiO 2 film showed the best performance with 2.70% of power conversion efficiency. Our work simplified the preparation process of TiO 2 slurry, shortened the preparation time, and realized the control of the crystal type proportion ofTiO 2 . It provides a new method for preparing transparent TiO 2 thin film for QDSSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Chenfan Gong,Hao Wang,Jian Zhang,Chengguang Yang,Xianni Bu,Haiyan Yang,Jiong Li,Peng Gao
Hydrogenation of CO2 to ethanol is an efficient process for the utilization of CO2 along with the production of value-added chemicals. However, CO2 hydrogenation to ethanol is a complicated reaction, requiring the catalyst to activate CO2 efficiently and accurately regulate the C–C coupling to achieve a high ethanol selectivity simultaneously. Herein, we report the synthesis of RhFeOx catalysts supported on TiO2 with different crystal phase compositions (anatase, rutile, and P25), which were applied for the selective CO2 hydrogenation to ethanol. The RhFeOx/P25 catalyst presented a high dispersion of Rh nanoparticles on the P25 support with abundant Rh0–Rhδ+–OV–Ti3+ (OV: oxygen vacancy) interfacial sites over the anatase/rutile junction. The optimized RhFeOx/P25 catalyst exhibited a high ethanol space–time yield of 18.7 mmol gcat–1 h–1 and a high Rh turnover frequency of 544.8 h–1 with 90.5% ethanol selectivity. An in-depth investigation via various ex situ and in situ characterizations as well as H2/D2 exchange and C2H4 pulse hydrogenation experiments demonstrated that the Rh0–Rhδ+–Ov–Ti3+ interfacial sites played a crucial role in the conversion of CO2 to ethanol. The surface Rh0 sites facilitated the CO2 activation and hydrogenation, while the Rh0–Rhδ+–Ov–Ti3+ interfacial sites boosted the C–C coupling to produce ethanol. The high-performance RhFeOx/P25 catalyst also provides an attractive route for highly efficient ethanol synthesis via CO2 hydrogenation.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jingtao Bi,Qingqing Tao,Jie Ren,Xin Huang,Ting Wang,Hongxun Hao
Heterojunction with same elements but different types of semiconductors is a special material which is convenient for fabrication and industrialization. In this work, a series of α/γ-Fe 2 O 3 isoelement heterostructures with different crystal contents (γ-Fe 2 O 3 , 10 % α-Fe 2 O 3 /90 % γ-Fe 2 O 3 , 33 % α-Fe 2 O 3 /67 % γ-Fe 2 O 3 , 55 % α-Fe 2 O 3 /45 % γ-Fe 2 O 3 , 78 % α-Fe 2 O 3 /22 % γ-Fe 2 O 3 and α-Fe 2 O 3 ) were constructed by hydrothermal method combined with controlled partial annealing process. Physicochemical analyses including XRD, TEM , XPS , BET, UV-Vis, PL spectra and ESR analyses were applied to investigate the advantages of isoelement α/γ-Fe 2 O 3 compared with the pure single-crystalline Fe 2 O 3 . Benefiting from the enlarged specific surface area and staggered band structure, the fabricated heterostructure with 78 wt% α-Fe 2 O 3 content exhibited more efficient separation of charge carriers and thus superior photodegradation efficiency than pure Fe 2 O 3 under visible-light irradiation. Different from TiO 2 -based P25 heterostructures, Fe 2 O 3 system possesses narrower bandgap and cannot efficiently consumed the excited holes. As a result, the accumulated h + would inhibit the further separation of excitons with photocatalysis proceeding and thus induce insufficient driving force for the increment of photocatalytic ability like P25. The results presented in this work would be conducive to the rational design of staggered heterostructures.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）