COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Fucheng Yu,Haiyang Chen,Xin Tian,Yadong Zhou,Junpeng Cui,Cuixia Li,Jianbin Zhang,Xianxi Tang,Yangshuo Liu
A new binary composite photocatalyst consisting of ZnO hollow nanospheres and ZnCo 2 S 4 nanoparticles was prepared by a two-step method. Carbon nanospheres as templates for the preparation of ZnO hollow nanospheres were synthesized by a hydrothermal method . Using X-ray photoelectron spectroscopy (XPS), ultraviolet visible diffuse reflectance spectroscopy (UV vis DRS) and Mott Schottky curve measurements, the regulated band structure of the composite was determined, and then the type-II carrier transfer mechanism in the composite was identified. The effect of the mass ratio of ZnCo 2 S 4 to ZnO on the photocatalytic performance of the composite was investigated. With the increase in the mass ratio of ZnCo 2 S 4 to ZnO, the photocatalytic performance of the composite first increases and then decreases, and the composite sample with a mass ratio of 30% shows the best performance. Furthermore, the introduction of oxygen vacancy (V O ) defects into ZnO hollow nanospheres not only improves the photocatalytic performance of the composite but also greatly improves photocorrosion resistance. Therefore, the newly discovered ZnCo 2 S 4 /ZnO composite photocatalyst has potential practical applications.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Jing Wu,Jiabing Li,Gary Owens,Zuliang Chen
The widespread use of antibiotics, such as oxytetracycline (OTC) and levofloxacin (LEV), has led to dangerous levels of environmental contamination. In this study, functionalized iron/manganese nanoparticles (Fe/Mn NPs), which act as both adsorbent and Fenton catalyst, were green-synthesized using a reducing agent derived from a tea extract. The resulting pre-sorption/Fenton-like oxidation system effectively removed both OTC and LEV from the aqueous solution with adsorption capacities of Fe/Mn NPs for OTC and LEV of 58.8 and 192.3 mg·g −1 , respectively. In addition, Fe/Mn NPs also showed high catalytic activity, oxidizing more than 99.9 % of both OTC and LEV, while sodium persulfate (PDS) removed only 26.6 and 29.0 % of OTC and LEV, respectively. Mechanisms of PDS activation typically involve either catalyst-initiated or mediated electron transfer reactions. Fe/Mn NPs through heterogeneous catalytic and metal leaching-induced homogeneous Fenton reactions, which generated various reactive oxygen species (ROS) including 1 O 2 , ·OH, SO 4 - · and ·O 2 – . Characterization of Fe/Mn NPs before and after reaction, and the identification of specific OTC and LEV degradation products by LC-MS, helped to elucidate a potential degradation pathway, as well as the removal mechanism. Finally, the practicality of using this system for wastewater treatment was demonstrated using real wastewater samples indicating that the system has great potential for simultaneously degrading both OTC and LEV in contaminated wastewater.
研究领域:
环境科学
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纳米技术
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生物学
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产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Quan Wang,Xueqing Liu,Zhe Qiang,Zhendong Hu,Xin Cui,Huaixiao Wei,Jinjin Hu,Yuming Xia,Shuohan Huang,Jianming Zhang,Kun (Kelvin) Fu,Yuwei Chen
Photocuring-based 3D printing becomes an emerging technology in various applications owing to their advantages of high design flexibility and low cost. Developing 3D printing resins with high dielectric constant is important for enabling on-demand manufacturing of energy storage materials . Herein, we report a scalable and simple approach for preparing ultraviolet (UV) curable resin composite with high dielectric constant, through the introduction of cellulose nanocrystals (CNCs) as bio-fillers into methacrylate malate photocurable resins (MMPR). MMPR resin was synthesized by reacting methacrylic acid (MAA) with malate resin (MR), while CNCs were also grafted to MAA for allowing the uniform dispersion of fillers in the polymer matrix . Subsequently, high dielectric constant composite resin CNCs-MAA/MMPR was prepared by simply mixing CNCs-MAA with MMPR and the dielectric constant of materials can be manipulated by varying the content of CNCs-MAA particles. Specifically, with the addition of 1 wt% CNCs-MAA, the dielectric constant increases from 4.0 (MMPR) to 10.9 at 1 MHz, which can be attributed to the interfacial effect between CNCs-MAA and MMPR matrix and the abundant presence of polar groups (-OH) from CNCs surface. The prepared resin composite can be directly used for conventional 3D printing technologies. Specifically, practical use of CNCs-MAA/MMPR composites for energy storage was demonstrated, which the capacitance of MAA/MMPR resin with 1 wt% CNCs increases more than 132% compared to pristine MMPR. This work provides an industrially feasible method for preparing photocurable resin composites with high dielectric constants for 3D printing.
研究领域:
材料科学
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能源技术
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Zhixia Wang,Hang Song
s A series of quaternary N-alkyl tropinium cationic surfactants (TILS) were synthesized and characterized. The effect of temperature, hydrophobic chain length and anions on their properties were studied. By changing the structure of anion, the krafft point was significantly reduced (from 313.15 K to below 273.15 K) and wide temperature window was obtained. The critical micelle concentration ( CMC ) value of TILS based on electrical conductivity method was found to be decreased about 4-5 times by increasing hydrophobicity of anions. At lower temperature and longer hydrophobic chain, TILS had lower CMC value and better surface activity. The thermodynamic properties of micellization Gibbs free energy Δ G mic , enthalpy Δ H mic and entropy T Δ S mic of micelles were obtained by Mass action model. The result indicates that the micellization process of the TILS was spontaneous and more stable with the increase of anionic hydrophobicity. In addition, with the increase of hydrophobic side chain length, the driving force of surfactant micellization may be enthalpy driven at higher temperature and entropy driven at lower temperature. The micro-environment of TILS solution with different concentrations was studied by UV spectrophotometry with curcumin as a probe and the change of micro-environment was used to determine the CMC of TILS. The CMC values were similar obtained by two methods.
研究领域:
化学
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材料科学
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界面科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Jingzhen Wang,Linlin Zang,Libin Wang,Yutong Tian,Zhiyu Yang,Yumei Yue,Liguo Sun
Photocatalytic degradation is an effective technique for removing antibiotics from contaminated water . The kernel of photocatalytic degradation lies in the design and preparation of high-performance and recyclable catalysts. Herein, magnetic porous cobalt ferrite/reduced graphene oxide (CF/rGO) balls were prepared by calcination of spherical composites obtained via modified microfluidic method for effective photocatalytic degradation of oxytetracycline (OTC). The strong interfacial interaction between rGO and cobalt ferrite nanoparticles in porous balls enhanced electron transfer , charge separation and light absorption . Porous spherical structure was favorable for light harvesting. The catalyst could rapidly and efficiently absorb OTC. These characteristics were beneficial to the enhancement of photocatalytic efficiency. The optimized sample (CF/rGO-0.2) exhibited an excellent apparent rate constant (0.0410 min −1 ) for OTC degradation under visible light irradiation, which was 3.73 times that of CF/rGO-0 (0.0110 min −1 ). CF/rGO-0.2 had excellent stability in cycle experiments and could be quickly recovered by magnets. The trapping experiments showed that hole (h + ) and superoxide radicals (·O 2 - ) acted an extremely important role in degradation of OTC, thus suggesting a possible photocatalytic reaction mechanism. This work provides a potential photocatalyst for antibiotic removal from water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Zhiran Hou,Wei Wang,Ningning Dong,Pei Chen,Lifa Ge,Fatang Tan,Xinyun Wang,Xueliang Qiao,Po Keung Wong
In this study, a dual-oxidant advanced oxidation process (AOP) system containing calcium peroxide (CaO 2 ) and peroxymonosulfate (PMS) was developed for the first time to efficiently degrade refractory organic pollutants . It was found that the system with 0.1 g/L CaO 2 and 0.3 g/L PMS could degrade more than 91% of 50 mg/L tetracycline (TC) within 4 min at room temperature, and the degradation process much followed the pseudo second-order kinetic model. The presented AOP system exhibited strong anti-interference capabilities towards coexisting inorganic anions (Cl − , SO 4 2– , NO 3 – , HCO 3 – and HPO 4 2– ) and humic acid (HA), even at high concentrations. Moreover, the system could efficiently work in a wide pH (3−12) range, suitable for natural waterbodies and various organic pollutants. The results of quenching experiments and electron paramagnetic resonance (EPR) tests demonstrated that singlet oxygen ( 1 O 2 ) was the dominate reactive oxygen species (ROS) responsible for organics degradation. A synergistic mechanism of the dual-oxidant system was confirmed by a series of comparative experiments, where CaO 2 continuously provided OH − and H 2 O 2 , and then combined with PMS to produce predominant 1 O 2 and inferior O 2 •– , respectively. Further, the possible pathways of TC degradation were deduced based on analyses of the intermediates.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2022
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IF 5.436
Ruo-Qin Jia,Ying-Jun Chen,Lu-Yang Zuo,Yu-Jie Jin,Bo Li,Li-Ya Wang
Photocatalytic degradation of pollutants is an effective environment purification strategy. Metal–organic frameworks (MOFs) have attracted extensive attention in the field of photocatalysis owing to their structural diversity, uniform cavity, and large specific surface area. However, poor electrical conductivity, light absorption, and water stability restrict their development. The tailorable structure of MOFs may effectively overcome these limitations. Herein, three Cu-based MOFs (complexes 1–3) with one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) structures, respectively, were successfully prepared by introducing different uncoordinated ligands and adjusting the ligand/metal salt ratio. Among them, complex 1 with a 1D chain was constructed as a typical J-type aggregation by π–π stacking interactions between adjacent naphthalene rings. This intermolecular aggregation mode enhances strong exciton coupling between conjugated rings, reduces the transition energy, expands the intrinsic light absorption edge, and provides a channel for electron transport, thus improving the charge-separation efficiency. As expected, complex 1 with a 1D chain structure exhibited excellent Fenton-like catalytic activity. The apparent reaction rates were 3.2 and 2.0 times higher than those of 2D and 3D MOFs, respectively.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Lu-Lu Wang,Shun-Feng Jiang,Jing Huang,Hong Jiang
Oxygen-containing functional groups in functionalized biochar (BC) play an important role in its environmental applications. Herein, we introduced oxygen atoms into BC by copyrolysis of sawdust and magnesium carbonate basic pentahydrate (MgCO 3 ) 4 ·Mg(OH) 2 ·5 H 2 O for the preparation of O-enriched porous BC (OPBC). OPBC800 (OPBC pyrolyzed at 800 °C) exhibited ultrahigh activity to activate ferrate (K 2 FeO 4 ) for the oxidation of sulfadiazine (SDZ, 100% removal of SDZ in 2 min at pH = 5). We found that SDZ molecules can be rapidly adsorbed by the hierarchical porous structure of OPBC and were expediently oxidized by in situ generated Fe(IV) and Fe(V) active species on the surface of OPBC. The degradation mechanism of SDZ involved is quite different from the well-confirmed mechanism in which only active species in the solution play a role. Electrochemical impedance spectroscopy showed that O-doping in OPBC improved the electron-donating ability and expedited the electron transfer to ferrate, thus enhancing the catalytic activity of OPBC. This provides a new functionalization method for BC and provides more information about the activation of ferrate.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Chi Zhang,Wei Xiong,Yi Li,Li Lin,Xinyi Zhou,Xinyan Xiong
Viruses transmitted by water have raised considerable concerns for public health. A novel memory photocatalyst of g-C 3 N 4 /WO 3 /biochar was successfully developed for effective inactivation of human adenoviruses (HAdVs) in water, in which WO 3 as an electron-storage reservoir and biochar as an electron shuttle is employed to synergistically improve photocatalytic activity of g-C 3 N 4 . The tertiary composite exhibited continuous photocatalytic performance for HAdVs inactivation without regrowth in water under light-dark cycles, i.e., ∼3.9-log inactivation under 6-h visible light irradiation and an additional ∼1.1-log inactivation under the following 6-h dark. The enhanced virucidal mechanism was attributed to the heterojunction formation and especially the electron-transfer pathway switching via biochar incorporation, contributing to electron transfer and storage in the light phase and then electron release in the dark phase, along with obviously increased generation of the virus-killing •OH radicals under light-dark cycles.
研究领域:
环境科学
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病毒学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Yanzhuo Zhang,Jing Zhao
The goal of this work was to elucidate the ability of biochar materials prepared by different methods to degrade antibiotics by activating peroxymonosulfate (PMS). S atom was doped into biochar using diphenyl disulfide (DD), sodium thiosulfate (ST), and thiourea (TU) as S precursors. The different doped materials were used to activate PMS and tested for the ability to degrade tetracycline hydrochloride, sulfadiazine sodium salt, and levofloxacin hydrochloride. The average degradation efficiencies of DD-doped hydrothermal + pyrocarbon (DD-HPBC), TU-doped hydrothermal + pyrocarbon (TU-HPBC), and ST-doped hydrothermal + pyrocarbon (ST-HPBC) were 83.76%, 86.74%, and 93.60%, respectively, all higher than the degradation efficiency of the undoped material. When sodium thiosulfate-doped pyrocarbon (ST-PBC), hydrochar (ST-HBC), and hydrothermal + pyrocarbon (ST-HPBC) were used to activate PMS, the highest degradation efficiencies were achieved, with average rates of 71.59%, 78.22% and 97.20%, respectively. ST-HPBC exhibited the highest concentration of environmentally persistent free radicals (EPFRs), 9.47 × 10 18 spin/g, among all biochar materials. Given this high concentration of EPFRs, use of ST-HPBC to activate PMS resulted in a very high rate of antibiotic degradation, and the concentration of EPFRs was positively correlated with the degradation efficiency. Increase of specific surface area, the thiophene S (-C-S-C-) ratio, and concentration of EPFRs in S-doped biochars promoted the degradation of antibiotics. For PMS activated by biochar, reactive oxygen species (ROS) degraded antibiotics in the order of sulfate radical (SO 4 •- ) > singlet oxygen ( 1 O 2 ) > hydroxyl radical (•OH) > superoxide radical (•O 2 − ). This work provides new insight into the application of S-doped sludge biochar materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Toxics
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2022
·Vol. 10
·期 10
·555
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IF 4.472
Tingting Liu,Fanyu Yang,Liming Wang,Liang Pei,Yushan Hu,Ru Li,Kang Hou,Tianlong Ren
The application of semiconductor photocatalysts with narrow band gaps is hindered by the rapid recombination of electron–hole pairs and limitation of multiple reactive oxygen species (ROS) synchronous generation. A n–n-type direct Z-scheme heterostructured photocatalyst was constructed based on the staggered band alignment of bismuth tungstate (Bi2WO6) and indium zinc sulfide (ZnIn2S4) to reveal the synergistic effect of charge separation and multiple ROS synchronous generation on boosting photocatalytic performance. Under irradiation, electrons in the conduction band (CB) of Bi2WO6and holes in the valence band (VB) of ZnIn2S4recombined at interface to prolong the lifetime of electrons in the CB of ZnIn2S4and holes in the VB of Bi2WO6. Meanwhile, the multiple ROS synchronously generated to oxidize pollutant due to the strong redox ability of electrons of ZnIn2S4and holes of Bi2WO6, which was determined by the CB potential of ZnIn2S4and VB potential of Bi2WO6. The results provided valuable insights for the application of photocatalysts with a narrow band gap in the field of water pollution control.Keywords:photocatalysis;direct Z-scheme heterojunction;charge separation;redox ability;photoelectrochemical property
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Huiqin Ma,Weiyi Yang,Shuang Gao,Wanrong Geng,Yunli Lu,Chunliang Zhou,Jian Ku Shang,Tuo Shi,Qi Li
The internal polarizations of polar photocatalysts could be enhanced through unit cell structure modulations to improve their photocatalytic performances. In this work, a simple, robust and low-cost NaOH etching process is developed to treat ultrathin Bi 2 WO 6 nanosheets after their creation, resulting in a higher degree of polyhedron distortion (∼141 %) and an enhanced piezoelectricity (∼260 % the maximum effective piezoelectric coefficient d 33 ). Compared with pristine ultrathin Bi 2 WO 6 nanosheets, these etched samples demonstrate an improved charge carrier separation and transfer behavior due to their enhanced internal polarization with the assistance of richer oxygen vacancies, which largely enhance their piezocatalysis (∼4.6 times), photocatalysis (∼14.3 times) and especially coupled photopiezocatalysis (∼33.9 times) performances as demonstrated in their sulfamethoxazole (SMX) degradation performances. ·O 2 – , 1 O 2 and h + are proven to be main reactive oxygen species (ROSs) during their photopiezocatalytic process and they could also work well in the real water matrix.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）