JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2023
·Vol. 149
·期 6
·04023029
·
IF 2.2
Wenbo Zhu,Xin Qiao,Lan Ling
Nanoscale zero-valent iron (nZVI) is one of the most prevalently used engineered nanomaterials for heavy metals removal. Microplastics (MPs) have been detected extensively in the environment, such as soil, surface water, groundwater, and water treatment plant. PVC MPs and Cd coexist in a variety of environment, and Cd compounds are often used as stabilizers in PVC production, which increases the likelihood of their coexistence. In this work, the influence of aged PVC MPs on Cd2+ removal with nZVI was evaluated. Spent nZVI after reaction with Cd2+ with and without MPs was characterized with scanning transmission electron microscopy (STEM), energy-dispersive spectroscopy (EDS), scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FTIR), and Brunauer-Emmett-Teller (BET). The results showed that when MPs coexisted, the removal rate of Cd2+ with nZVI increased by up to 73.4%. Spent nZVI has more extensive oxidation, and has looser structure and higher specific surface area in a mixed contamination solution with trace MPs, resulting in high removal efficiency of Cd2+. Interaction between PVC MPs and nZVI shows positive promotion toward removal of Cd2+ with nZVI; thus, nZVI may have great potential for remediation of Cd in the water environment rich in PVC MPs.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 4
·045006
·
IF 1.068
Hongtao Cui,Li Wang,Min Shi,Yanhong Li
In this work, lepidocrocite (γ-FeOOH) nanobundles were prepared by a facile NH4F assisted epoxide precipitation route. The reactions between epoxide and [Fe(H2O)6]2+ promoted the hydrolysis and condensation of [Fe(H2O)6]2+, resulting in the formation of iron oxyhydroxide. After calcination of γ-FeOOH nanobundles at 400 °C, the produced α-Fe2O3 still kept the bundle morphology. Due to the unique chemistry of epoxide, the morphology and phase of iron oxide polymorph nanoparticles (goethite, akaganeite, lepidocrocite, magnetite) were well-controlled through controlling reaction conditions such as Fe2+ concentration, NH4F additive and reaction temperature. It is particularly interesting that NH4F working as phase controlling agent is able to control the phase development of iron oxyhydroxides. This phase control effect of NH4F is attributed to the promoted reaction rate of epoxide originating from the higher electronegativity of fluoride ions than chloride ions. Based on the results in this work and our other preliminary works, it is considered that this route can be used as a general strategy for controlling the morphology and phase of transition element compounds.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Qiqi Wei,Qiang Zhang,Jiuyan Chen,Taotao Lu,Kun Zhou,Weifeng Chen,Zhichong Qi,Deliang Li
Inorganic ligands, ubiquitous in the natural environment, can interact with iron oxide minerals. To date, our knowledge regarding the effects of inorganic ligands on the adsorption properties of antibiotics onto iron oxides is still limited. In this work, the influences of different inorganic ligands (chosen iodate , silicate, and phosphate as the model ligands) on the adsorption of tetracycline (TC) onto hematite were examined. Adsorption isotherms indicated that inorganic ligands inhibited TC adsorption. The observations were attributed to the increase of electrostatic repulsion between anionic species (i.e., TC – ) and negatively charged hematite particles as well as the competition between TC – species and inorganic ligand anions for the adsorption sites on hematite surfaces. Interestingly, the inhibitory effects of the three inorganic ligands were in the order of phosphate > silicate > iodate; the trend was stemmed from their differences in the binding affinities to hematite and the molecular size. When the background solutions contained divalent cations (e.g., Ca 2+ ), surface precipitation of Ca-inorganic ligand compounds on hematite was another important mechanism for the inhibitory effects. Furthermore, adsorption of TC onto hematite with or without inorganic ligands was strongly affected by solution pH, which was due to the combination of the amphoteric behavior of TC and highly pH-dependent surface charges of the hematite mineral. Current results highlight the critical roles of ubiquitous inorganic ligands in revealing the fate of tetracycline antibiotics in natural systems.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ACS ES&T Engineering
·
2022
·
IF 0
Ting Zhang,Zhelun Pan,Dinggui Song,Hong Huang,Jiang Yu,Yichan Wen,Junlin Lu,Zhenfeng Bian,Xufang Qian
The high reactivity of Fe(0) with Cr(VI) makes it the best choice for Cr(VI) removal. Interstitial compound Fe3C was produced during the carbothermic reduction of mesoporous phenolic resin/ferric ions to form Fe(0)/Fe3C nanoparticles embedded in mesoporous carbon (Fe(0)/Fe3C@MesoC). Fe3C accelerates the electrochemical corrosion process of α-Fe(0) in solution, and the positive/negative equipotential interface that is formed by iron–carbon (Fe–C) microelectrolysis of Fe(0)/Fe3C@MesoC induces the capture of Cr(VI) anions and Cr(III) cations as a result of this process. Cr(VI) was completely reduced to Cr(III) by the Fe(0)/Fe3C@MesoC catalyst with a high electron efficiency (40.5%) relative to nanosized zero-valent iron (1.9%) and Fe@MesoC (32.7%). Surface ferrous ions are the principal reactive species responsible for Cr(VI) reduction (at least 64%); Fe(0)/Fe3C and undetectable surface ferrous ions account for a small part of Cr(VI) reduction (around 28%), and only 8% of Cr(VI) ions are reduced by active hydrogen (H*). The proposed structure of Fe(0)/Fe3C@MesoC provides new insight into iron–carbon material preparation and application in in situ chemical reduction.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
LUMINESCENCE
·
2016
·Vol. 31
·期 8
·1448-1455
·
IF 1.452
Lingcan Kong,Keyu Lu,Guangyuan Ma,Yuyang Yao,Xia Ling,Wenwei Liu
One strong fluorescent Bodipy-containing derivative was synthesized and characterized using 1 H NMR, electrospray ionization mass spectrometry and elemental analysis. Its electrochemical and photophysical properties were investigated. In addition, the Bodipy derivative could be used as an on–off fluorescent probe for the detection of Fe 3 + ions based on the inner filter effect because the absorption band of the Fe 3 + ion overlaps the excitation band of Bodipy very well upon irradiation with UV light. Furthermore, the Bodipy-based sensor has obvious advantages including simplicity, rapid response, high selectivity, sensitivity and a detection limit of 1.2 μ mol/L, and has been demonstrated in real water samples including tap water, mineral water and water from Lake Tai. Moreover, the fluorescent probe could also be used as a probe for the determination of Fe 3 + in cellular and bacterial imaging. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
分析化学
·
生物成像
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 6
·期 8
·2100004
·
IF 7.848
Xiaocheng Hu,Yimou Fu,Yide Liu,Binhong Liu,Shaoxing Qu
Adhesion appears in nature as a kind of clinging strategy for living creatures to survive in a complex environment. Nevertheless, the artificial counterpart applications are limited by many factors, such as slow responding rate and high driving voltage. In this paper, a novel magnetic adhesion achieved by the actuation of Ecoflex embedded with iron particles is presented, which is demonstrated by a magnetic suction cup (MSC) that can switch the adhesion state within 500 ms. Compared with suction cups made of the dielectric elastomer in existing literature, the present work's driving voltage is safe for humans. Furthermore, a mechanical model is developed and verified to optimize the design of the MSCs. By applying an altering magnetic field, the adhesive force varying with time exhibits complex waveforms such as sinusoidal wave, triangle wave, square wave, and even pulse wave can be achieved. For some situations that large adhesion force is not necessarily considered while the adhesion requires to be accurately and quickly controlled, such as transfer printing and intelligent sensing, the magnetic adhesion demonstrated in this article will enrich the future available applications.
研究领域:
仿生学
·
材料科学
·
机器人学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Xinrui Cheng,Guoqiang Xi,Yue-Wen Fang,JiaQi Ding,Jianjun Tian,Linxing Zhang
Ferroelectric thin films with switchable polarization and anomalous photoelectric effects have received extensive attention recently. However, the improvement of photoelectric performance is accompanied by the weakening of ferroelectricity . Here, both chemical and interlayer design are used to regulate the polarization and optical properties of BiFeO 3 -based ferroelectric films. We achieved an improvement in both ferroelectricity and bandgap by chemical composition. The remanent polarization has been enhanced to 73.8 μC/cm 2 from 0.2 μC/cm 2 , ascribed to the structural transition. The band gap of Eu-BiFeO 3 films has been reduced to 2.23 eV from 2.42 eV due to the unique energy level from Eu 4 f , indicating the enhanced visible-light-absorbing capability. We have designed a "sandwich" interfacial structure of homogeneous Eu-BiFeO 3 films. A clever combination between optimal ferroelectricity and narrow band gap with near Eu contents of BFO films would generate an interfacial layer with a homogeneous gradient component, which should favor the switching of ferroelectric domains. The results show that the remanent polarization improved by 17 % to 86.2 μC/cm 2 while the band gap has also improved. Intriguingly, the short-circuit current density ( J sc ) and open circuit ( V oc ) of the photovoltaic signal of the optimal films are 89.0 nA and 0.412 V, respectively. This provides a simple and intelligent way to design the ferroelectric-photoelectric thin films and lays the foundation for optical information storage devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Linquan Sun,Xukun Zhang,Lina Wang,Hongdong Yu,Fancheng Meng,Tao Qi,Yihe Peng
A fluoride-free solvent extraction method for niobium separation in leached sulfuric mother liquor of ilmenorutile was proposed in this paper. The extraction system comprising trioctyl tertiary amine (N235) and 4-methyl-2-pentanone (MIBK) demonstrated good extraction efficiency and selectivity of niobium over titanium and iron impurities in sulfuric acid–oxalate solutions. Details of extraction, scrubbing, and stripping processes were investigated herein, and its practical effectiveness in both batch and multi-stage simulated counter-current modes was verified. Over 73.8% niobium was extracted under optimum conditions, and only 2.8% titanium and 1.7% iron were co-extracted. The recovery of niobium reached 99.1% in the four-stage simulated counter-current extraction tests. In the three-stage simulated counter-current stripping tests, the stripping efficiency of niobium reached 99.7% with 2.0 mol/L HNO 3 . Qualified niobium oxide products were prepared. The enthalpy change, entropy change, and the standard Gibbs free energy change (Δ H o , Δ S o , and Δ G o , respectively) corroborated the exothermicity, orderliness, and spontaneity of the reaction. The possible composition of the extraction complex was [NbO(C 2 O 4 ) 2 (H 2 O) 2 ] − , as supported by a Fourier transform infrared spectroscopy and ultraviolet–visible spectrophotometry. The extraction mechanism was inferred to be the outer-sphere complexation through physical binding which was the association of R 3 NH + in N235 with the [NbO(C 2 O 4 ) 2 (H 2 O) 2 ] − . A preliminary mass balance indicated that 203.92 g Nb 2 O 5 was generated from 1000 g raw material ilmenorutile.
研究领域:
冶金学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2023
·
IF 2.5
Chenchen Ma,Zihan Ma,Ziyuan He,Xianjian Wang,Longhao Zhao,Xuegang Chen
Novel hydrophilic polymers consisting of fluorene modified by alkoxyl chain were designed and synthesized via radical polymerization from acrylic acid (PAAF) or acrylamide (PAMF) in the presence of azobisisobutyronitrile. All of these polymers were good water-soluble. The photophysical behaviors of the polymers and the selectivity and sensitivity to detection metal ions were studied by UV-visible and fluorescence spectroscopy technique, and some color changes were visible to the naked eye appeared. The PAMF fluorescent probe showed good selectivity and sensitivity to detection Fe3+ (2.4 × 10−7 mol/L) and PAAF exhibited good selectivity and sensitivity to detection Fe2+ (1.5 × 10−6 mol/L) and Cu2+ (5 × 10−7 mol/L) in water.
研究领域:
高分子化学
·
分析化学
·
材料科学
·
传感技术
·
荧光光谱学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Ruixia Han,Zhe Wang,Jitao Lv,Zhe Zhu,Guang-Hui Yu,Gang Li,Yong-Guan Zhu
Microbially mediated iron redox processes are of great significance in the biogeochemical cycles of elements, which are often coupled with soil organic matter (SOM) in the environment. Although the influences of SOM fractions on individual reduction or oxidation processes have been studied extensively, a comprehensive understanding is still lacking. Here, using ferrihydrite, Shewanella oneidensis MR-1, and operationally defined SOM components including fulvic acid (FA), humic acid (HA), and humin (HM) extracted from black soil and peat, we explored the SOM-mediated microbial iron reduction and hydroxyl radical (•OH) production processes. The results showed that the addition of SOM inhibited the transformation of ferrihydrite to highly crystalline iron oxides. Although FA and HA increased Fe(II) production over four times on average due to complexation and their high electron exchange capacities, HA inhibited 30–43% of the •OH yield, while FA had no significant influence on it. Superoxide (O2•–) was the predominant intermediate in •OH production in the FA-containing system, while one- and two-electron transfer processes were concurrent in HA- and HM-containing systems. These findings provide deep insights into the multiple mechanisms of SOM in regulating microbially mediated iron redox processes and •OH production.
研究领域:
环境科学
·
微生物学
·
地球化学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Yuan Liu,Yun Ji,Peng Wang,Xiao Wu,Ya Yang
The photocurrent produced by the synergy of pyroelectric and photovoltaic effects in ferroelectric materials exhibits great potential for photodetection. Photocurrent generated by various ferroelectric materials exhibits a different behavior with the ambient circumstance especially the temperature, making it a long-term topic. Here, we report a remarkable promotion in the photocurrent of a photoelectric device based on ferroelectric (K0.5Na0.5)(Nb0.94Sb0.06)O3-Bi(Ni0.33Nb0.67)O3 (KNNS-BNN) materials via temperature modulation. When compared with the photocurrents obtained at room temperature, by lowering the atmospheric temperature to 14.8 °C, the peak photocurrent is increased by 219%, and by raising the temperature to 46 °C, the platform photocurrent is improved by 69.9%. The enhanced photocurrents are mainly ascribed to temperature-controlled conductivity and energy band structure of the KNNS-BNN materials. Working as a self-powered photodetector, the responsivity of the device reaches 4.01 × 10–6 A W–1. This work provides new possibilities for high-performance ferroelectric photodetectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 45
·455405
·
IF 3.551
Xiaolin He,Chaoqun Shang,Qingguo Meng,Zhihong Chen,Mingliang Jin,Lingling Shui,Yongguang Zhang,Zhang Zhang,Mingzhe Yuan,Xin Wang,Krzysztof Kempa,Guofu Zhou
Hematite is recognized as an excellent photocatalyst for photoelectrochemical photoanodes for water oxidation because of its favorable band gap, excellent anti-photocorrosion and structural stability in alkaline solution. However, slow charge transport and fast carrier recombination in the bulk and at the hematite photoanode/electrolyte interface, have limited its applications for water splitting. Herein, we report a highly efficient hematite/ferrhydrite (Fh) core–shell photoanode system, consisting of hematite (α-Fe2O3) semiconductor nanorods which dramatically enhance light harvesting, and ferrhydrite as the hole-storage shell. Our integrated hematite/ferrhydrite core–shell photoanode shows 2.7 times increased photo-current density under simulated sun light irradiation.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）