APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Sheng Guo,Haojie Wang,Wei Yang,Hussain Fida,Liming You,Kun Zhou
In this work, a cost-effective and eco-friendly calcium-doped α-Fe 2 O 3 (Ca-Fe 2 O 3 ) with abundant oxygen vacancies was fabricated using a scalable precipitation-calcination method to activate peroxymonosulfate (PMS) for wastewater purification. Density functional theory calculations revealed that the incorporation of Ca 2+ into the α-Fe 2 O 3 structure enhances the electron transfer from α-Fe 2 O 3 to PMS, facilitating the activation of PMS. The degradation of Rhodamine B by 5%Ca-Fe 2 O 3 proceeded with a reaction constant 8 times higher than that of pristine α-Fe 2 O 3 . This can be attributed to the increased generation of 1 O 2 and O 2 • − , increased specific surface area and enhanced electrical conductivity. The applicability of the 5%Ca-Fe 2 O 3 /PMS system was investigated including its operating parameters and stability, and the intermediates involved in the reaction were identified. The 5%Ca-Fe 2 O 3 /PMS system exhibited excellent degradation efficiency in natural water samples. This work opens up new perspectives for designing highly efficient catalysts and renders iron oxides potential candidates for environmental remediation.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Meng Qiao,Xiaofei Wu,Shen Zhao,Ridha Djellabi,Xu Zhao
Due to the complicated chemical nature and toxicity of noble metal-cyanide complexes, the appropriate treatment of wastewaters contaminated with such pollutants is challenging. In this study, the simultaneous decomposition of Ag-cyanide and recovery of precious Ag from Ag-cyanide aqueous solution was investigated using a synergistic peroxymonosulfate (PMS)/g-C 3 N 4 nanosheets system under visible light (λ > 400 nm). The combination of g-C 3 N 4 (1.0 g/L) and PMS (0.5 mM) resulted in higher Ag-cyanide (0.45 mM) decomposition under visible light and Ag recovery efficiencies (74% and 68%, respectively) compared with single PMS oxidation or g-C 3 N 4 photocatalytic oxidation within 150 min. Ag species deposited on g-C 3 N 4 in the form of metallic Ag° and Ag 2 O may also further improve the decomposition of Ag-cyanide complexes. Ag species deposited on g-C 3 N 4 can enhance the separation of electron/hole charges of the photoactive g-C 3 N 4 . Quenching of reactive oxygen species (ROS) experiments and electron spin resonance (ESR) analysis showed the generation of SO 4 ·− , OH, O 2 − , 1 O 2 and e- species in this system, among them O 2 − , 1 O 2 , and e- were the most active species for the decomposition of Ag-cyanide complexes.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yaohua Wu,Yulian Li,Junyong He,Xun Fang,Peidong Hong,Mingxing Nie,Wu Yang,Chao Xie,Zijian Wu,Kaisheng Zhang,Lingtao Kong,Jinhuai Liu
In this work, 1D MnO 2 nano-needles were prepared and grown on the graphene oxide (GO) nano-sheets successfully. The morphology and structure of materials were explored. The MnO 2 nano-needles with a length of 200–400 nm were distributed uniformly on the GO nano-sheets. As a result of GO substrate, the MnO 2 /GO nano-hybrids (MnO 2 /GO) have the much larger surface area and more surface oxygen-containing functional groups than MnO 2 nano-needles, which are beneficial for enrichment and degradation of the norfloxacin (NOR). Results showed that more than 80% NOR was degraded within 20 min at the dose of 10 mM PMS and 0.8 g/L catalysts. Moreover, the optimal pH in MnO 2 /PMS and MnO 2 /GO/PMS system were both acidic condition. Furthermore, the mechanism of PMS activation by MnO 2 /GO was investigated through radical identification using quenching experiments and EPR techniques. According to this, the HSO 5 − of PMS reacted with Mn (IV)/Mn(III) to form a redox loop, and GO played an important role in the degradation process. Finally, the transformation intermediates of NOR were identified and four probable degradation pathways were speculated. This work would provide a potential contribution towards NOR removal in the environmental remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Mengjun Chen,Keyang Yin,Geping Zhang,Huizhong Liu,Bo Ning,Youyong Dai,Xiaojing Wang,Hongguang Li,Jingcheng Hao
Fullerene C60 (refers to C60 hereafter) has a unique three-dimensional architecture and intriguing physicochemical properties. It has great potential applications in materials chemistry and life science. However, a big obstacle for the widespread application of C60 lies in the limited strategies to make supramolecular structures with diverse morphologies and functions. Herein, we report a strategy to prepare C60-based, magnetic microcapsules which can be used as external antioxidants to effectively attenuate oxidative stress. The microcapsules are composed of fullerenol, a highly water-soluble C60 multiadduct, and iron ions (Fe3+) released from a rusty nail. They can be easily obtained through coordination between the hydrophilic functional groups in fullerenol and Fe3+ with polystyrene microspheres as templates. The fullerenol/Fe3+ microcapsules have good colloidal stability both in water and serum. Their biocompatibility has been confirmed by in vitro tests on HEK293 and Hela cells. Electron spin resonance measurements indicate that the fullerenol/Fe3+ microcapsules can effectively scavenge hydroxyl radicals (OH·–) produced by H2O2, which greatly improves the living environment of the cells. The fullerenol/Fe3+ microcapsules exhibit ferromagnetic properties and can respond to the external magnetic field, enabling magnetic manipulation, and/or separation in practical applications.
✓ 已验证
产品关联
DOI
PubMed
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 1
·194-199
·
IF 3.069
Wenda Wang,Xuerong Fan,Qiang Wang,Jin Xu,Lili Wang,Lipeng Liu,Xueming Bao
In this communication, acrylamide (AM) polymerisation to poly(acrylamide) was initiated by horseradish peroxidase (HRP) and acetylacetone (ACAC) without hydrogen peroxide (H2O2). Electron spin resonance (ESR) spectroscopy showed that free radicals of ACAC and AM were present in the reaction. Gel Permeation Chromatography (GPC), FT-IR, 1H-NMR and relative viscosity indicated that the product was PAM. Furthermore, the enzymatic cycling mechanism of the HRP–ACAC–H2O2 ternary system was also explained.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Mengmeng Dou,Jin Wang,Boru Gao,Ce Xu,Fan Yang
β-Lactam antibiotics are generally used for disease prevention in humans and animals. The antibiotics, which have been excreted into the surrounding environment, have caused serious concerns. In this study, mesoporous carbon nitride (MCN) was synthesized using a template-free method. The photocatalytic degradation of the two typical β-lactam antibiotics, amoxicillin (AMX) and cefotaxime (CFX), was performed using MCN. Considering the complexity of the actual environment, four factors that may influence the photocatalytic degradation of AMX and CFX were studied, containing the initial antibiotics concentration, catalyst dosage, pH and humic acid (HA). The possible mechanism of photocatalysis was presented using ESR spectroscopy and free radical trapping experiments. Furthermore, rational photocatalytic degradation pathways were proposed through the combination of LC-Q-TOF-MS/MS and density functional theory (DFT). Toxicity Estimation Software Tool (TEST) was used to predicate the toxicity of the byproducts. This study identified the catalytic activity difference between AMX and CFX firstly and elucidated their degradation mechanisms. The new findings are very meaningful for optimizing the conditions of photocatalytic degradation of β-lactam antibiotics. In addition, the results of wastewater test and stability experiments indicated that MCN has excellent performance. Therefore, MCN is a promising treatment material for the elimination of the antibiotic activity and mineralization of antibiotics under visible light.
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 3
·937-947
·
IF 7.704
Feng Liu,Weifang Zhang,Le Tao,Boyuan Hao,Jing Zhang
The coexistence of multiple-component contaminants, such as Cr(VI) and As(III) in acid mine drainage, brings more difficulties in the wastewater treatment. This study developed a novel strategy for simultaneous redox conversion and removal of Cr(VI) and As(III) in solution. By employing iron oxide encapsulated in a hydrothermal carbon sphere (HCS@Fe3O4), the synergistic photocatalytic reduction of Cr(VI) and oxidation of As(III) were markedly accelerated under simulated solar light irradiation. The transformed Cr(III) and As(V) were readily removed by forming Cr(OH)3 and FeAsO4 precipitates. The Fe(III)/Fe(II) cycle in the system, which was greatly reinforced by photocatalysis in the presence of HCS@Fe3O4, has been demonstrated to be critical in the redox of Cr(VI) and As(III). It can keep sufficient Fe(II) in solution to both directly reduce Cr(VI) and promote the generation of ˙OH for the oxidation of As(III). These findings provide an effectively synergistic conversion and removal strategy for implications in multiple-contaminated water treatment.
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2019
·
IF 4.511
Shilei Wang,Qiaomu Huang,Xiangyu Liu,Zhao Li,Hao Yang,Zhong Lu
The integration of nanomaterials with clinical therapeutic instruments is a promising approach to improve the effects of nanomaterials. We reported an efficient synergistic antibacterial strategy formed through the combination of Ag/ZnO nanocomposites with a light-emitting diode (LED) curing light, which is a commonly used small instrument in dental clinics. The as-designed integration depicted a significantly enhanced bactericidal effect on facultative anaerobic oral pathogen Streptococcus mutans (S. mutans) both in planktonic and biofilm phases over a very short irradiation time (≤5 min). Further study showed that the combination of LED and Ag/ZnO nanocomposites induced more ·OH and ·O2– generation, which is responsible for the enhanced antibacterial activity. Moreover, this combination could destroy S. mutans biofilm by killing the bacteria embedded within biofilm, inhibiting exopolysaccharide production and down-regulating the biofilm-related gene expression. Therefore, it is proposed that this combination could be applied in dental clinics to realize dental caries prevention and dental restoration simultaneously.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Xu Yan,Ziyang Wu,Peipei Yang,Yanli Mao,Biao Liu,Yong Zhao,Hao Shen,Dongliang Wang
In this article, novel Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction was synthesized by a facile ion-exchange method with thioacetamide as sulfur source. Multiple techniques were employed to analyze the structure and chemical composition of prepared samples. The photocatalytic performance of the Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction samples was investigated by the photodegradation of methyl orange under visible light. The Bi 2 S 3 /Bi 4 O 5 I 2 heterojunction of S/BOI-2 sample presented the highest activity constant among all samples. Additionally, the photocatalytic mechanism is proposed according to the trapping experiments and electron spin resonance (ESR) results.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Dongya Li,Jie Zan,Liping Wu,Shiyu Zuo,Haiming Xu,Dongsheng Xia
The g-C3N4–Cu2O (CNCu2O-G) with a p-n heterojunction structure in the presence of glutamate was successfully developed through hydrothermal synthesis and high-temperature calcination. When addition the glutamate, the surface morphology of the heterojunction was regulated, and its specific surface area increased by a factor of approximately 1.5, and reaction sites were increased. Additionally, the charge recombination rate of the heterojunction was reduced, and the absorption band was red-shifted to 460 nm, leading to stronger heterostructure contact interfaces, thus the visible-light utilization efficiency was enhanced. The catalytic performance of the CNCu2O-G was very stable, with no significant change in the photocatalytic efficiency of CNCu2O-G after six recycles, the Fourier transform infrared patterns and X-ray diffraction of CNCu2O-G exhibited no significant changes after the photocatalytic reaction. Furthermore, electron paramagnetic resonance and free-radical removal experiments indicated that the holes and superoxide radicals were dominant species during the reaction.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Shahzad Afzal,Xie Quan,Sen Lu
Ceria based catalysts have been widely applied in ozonation of organic pollutants in wastewater treatment. Ceria with different exposed facets have not been used in catalytic ozonation. In this study, ceria nanorods (R-CeO 2 ), nanocubes (C-CeO 2 ) and nanooctahedra (O-CeO 2 ) with different exposed facets (110) + (100), (100) and (111)) respectively were used in catalytic ozonation of p-nitrophenol. Two calcination temperatures 300 and 500 °C were selected for comparative catalytic activity. Ceria nanoparticles (NP-CeO 2 ) were also prepared for comparative catalytic activity. Approximately 86%, 71%, 68%, 64%, 60% and 40% TOC was removed by ozonation catalyzed by R300-CeO 2 , C300-CeO 2 , CeO 2 -NP, O300-CeO 2 , R500-CeO 2 and ozonation alone respectively. Nanorod calcined at 500 °C (R500-CeO 2 ) showed lower catalytic activity as compared to R300-CeO 2 . O 3 was also rapidly decomposed by R300-CeO 2 as compared to other catalysts and single ozonation. Inorganic hydroxyl radical scavengers and several characterization techniques were applied for investigating the underlying mechanism of catalytic ozonation. Hydroxyl radicals, surface peroxide and surface atomic oxygen as reactive oxygen species were generated for enhancing the catalytic activity. Furthermore, irrespective of surface area, the difference in catalytic activity of ceria nanoshapes were assigned to the differences in the abundance of surface basic sites, defects densities/oxygen vacancies (OVs) and coordination number of surface atoms. This study provides an insight to use other metals with variety of exposed facets for catalytic ozonation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xinshan Rong,Haifei Chen,Jian Rong,Xiaoying Zhang,Jing Wei,Shuang Liu,Xiangtong Zhou,Jicheng Xu,Fengxian Qiu,Zhiren Wu
In this report, environmental and energy issues were deal with a Z-scheme photocatalytic system toward the synthetic ammonia by N 2 photofixation. Different from traditional double-charge-transfer model, a direct all-solid-state Z-scheme system of modified TiO 2 (MT) loaded with ZnFe 2 O 4 (ZFO) was obtained by solvothermal-calcination method, in which calcination temperature is crucial for the mesoporous structure and formation of Z-scheme TiO 2 /ZnFe 2 O 4 . At ambient temperature and pressure, the MT/ZFO photocatalyst presented the ammonia generation rate of about 1.48 μmol/L/min, which is higher than that of single MT or ZFO. The photocatalytic activity enhancement of ammonia generation was attributed to the Z-scheme charge transfer model with a more negative reduction potential in the conduction band of ZnFe 2 O 4 . Combining the commonly TiO 2 and ZnFe 2 O 4 by a special method shows a desirable Z-scheme photocatalytic system, which can be extended to the fabrication of other Z-scheme photocatalyst according to the various application need.
✓ 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）