Nanomaterials
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2021
·Vol. 11
·期 11
·3122
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IF 5.076
Rao Fu,Yinyan Gong,Can Li,Lengyuan Niu,Xinjuan Liu
The development of highly active and stable photocatalysts, an effective way to remediate environment pollution and alleviate energy shortages, remains a challenging issue. In this work, a CdIn2S4/In(OH)3nanocomposite was deposited in-situ on NiCr-LDH nanosheets by a simple hydrothermal method, and the obtained CdIn2S4/In(OH)3/NiCr-LDH heterostructure photocatalysts with multiple intimate-contact interfaces exhibited better photocatalytic activity. The photocatalytic H2evolution rate of CdIn2S4/In(OH)3/NiCr-LDH increased to 10.9 and 58.7 times that of the counterparts CdIn2S4and NiCr-LDH, respectively. Moreover, the photocatalytic removal efficiency of Cr(VI) increased from 6% for NiCr-LDH and 75% for CdIn2S4to 97% for CdIn2S4/In(OH)3/NiCr-LDH. The enhanced photocatalytic performance was attributed to the formation of multi-interfaces with strong interfacial interactions and staggered band alignments, which offered multiple pathways for carrier migration, thus promoting the separation efficiency of photo-excited electrons and holes. This study demonstrates a facile method to fabricate inexpensive and efficient heterostructure photocatalysts for solving environmental problems.
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高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Tao Wang,Jing Gu,Qun Cui,Haiyan Wang
A deep purification treatment of trace volatile organic compounds (VOCs) in the tail gas emitted from the top of oil storage tanks was performed. Metal organic framework MIL-101(Cr) (hereinafter referred to as MIL-101) was used to remove trace C4–C6 alkane mixture in the tail gas. Compared with the commercial activated carbon, adsorption and desorption processes of trace C4–C6 alkane mixture as well as the adsorption thermodynamic property of n-hexane on MIL-101 were analyzed. Results demonstrate that the adsorption isosteric heat of n-hexane on MIL-101 is 48–52 kJ/mol, 9 kJ/mol lower than that on activated carbon. Trace C4–C6 alkanes on MIL-101 were desorbed by a nitrogen purge at 393 K, and the desorption efficiency of MIL-101 was up to 98.9%, which is 35% higher than that of activated carbon (∼64.3%). After 10 adsorption/desorption cycles, the desorption efficiency of MIL-101 exceeds 97%, indicating good cycle stability. The desorption process is affected by the spatial fit between the molecular configurations of alkanes and the three-dimensional tetrahedral cage of MIL-101 or by the one-dimensional slit pore of activated carbon. For alkanes with the same carbon, n-alkanes are preferentially desorbed on MIL-101, whereas isoalkanes are preferentially desorbed on activated carbon. Rich mesopores connected with the tetrahedral cages of MIL-101 are beneficial for desorption of trace C4–C6 alkanes. It provides basic data for the deep treatment of VOCs in the tail gas of oil storage tanks.
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JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 9
·5543-5554
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IF 4.22
Huang Mengjun,Peng Di
In forensic science, the demand for the discovery and extraction of latent fingermarks at crime scenes in a fast and convenient way is still urgent. Herein, a rutile Cr- and Sb-codoped TiO 2 nanoparticle was synthesized via homogeneous precipitation and was characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, and X-ray fluorescence. Subsequently, the as-prepared nanoparticle was used to visualize latent fingermarks using a powder dusting method and to enhance the visualization of bloody fingermarks using a small particle reagent method on porous, semiporous, and nonporous substrates. Notably, the anti-ultraviolet property of this yellow nanoparticle was investigated. This intriguing property contributed to the detection of latent fingermarks on strong-fluorescence or multicolored surfaces in a negative-image manner. Moreover, two potential interaction mechanisms were proposed between hemoglobin and surfactants in bloody fingermark enhancement. This work showed that this rutile TiO 2 nanoparticle doped with Cr and Sb is a versatile eikonogen for the rapid visualization of latent and bloody fingermarks and has high sensitivity, selectivity, contrast as well as wide applicability compared with traditional developing methods.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Binbin Shao,Yufan Chen,Deli Wu,Chaomeng Dai,Yalei Zhang
Structural Fe(II/III) hydroxides on the shell of nano-zerovalent iron (nZVI) are reactive sites for As(III) adsorption. Well-controlled structural Fe(II) hydroxides (SFH) is prepared to serve for As(III) removal in present study. With oxygen As(III) removal by SFH occurred efficiently but the removal efficiency was greatly reduced under anoxic conditions. The mineral transformation from SFH to lepidocrocite probably contributed to the robust removal efficiency of As(III). It is found that Cu(II), Cr(VI) and NO 2 − in aqueous solution could act as oxidants and promote the mineral transformation of SFH. A more efficient As(III) removal was therefore observed without oxygen. The removal efficiency decreased in the order O 2 /SFH ≈ Cu(II)/SFH > Cr(VI)/SFH ≈ NO 2 − /SFH at near neutral pH. The removal efficiency was less dependent on the initial pH for O 2 /SFH and Cu(II)/SFH systems than Cr(VI)/SFH and NO 2 − /SFH systems. Distribution of As on solid phases was able to describe the removal mechanism of As(III), and the results showed that the mineral transformation promoted the precipitation process and inhibited outer-sphere complexation, thus leading to enhanced As removal. With Cu(II), Cr(VI) and NO 2 − , the generation of oxidants from SFH transformation drove As(III) oxidation, and contributed to total As removal.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Qinzhi Wang,Zhan Shi,Zhi Wang,Yijian Zhao,Jianuo Li,Huifan Hu,Yaowen Bai,Zhihao Xu,Hui Zhangsun,Li Wang
Acid orange II (AO II), a typical azo pigment, is strictly controlled by legislation and prohibited in foodstuffs. Herein, we prepared gold nanoparticles decorated amino-functionalized Cr-based metal-organic frameworks [NH 2 -MIL-101(Cr)@Au] via an in-situ reduction method as a surface-enhanced Raman scattering (SERS) substrate for simultaneous adsorption and detection of AO II. Gold nanoparticles are uniformly dispersed on the surface of NH 2 -MIL-101(Cr) owing to its three-dimensional (3D) structure and the interaction between –NH 2 and Au ions , providing more SERS-active “hot spots”. These NH 2 -MIL-101(Cr)@Au nanocomposites exhibited selective and high adsorption performance (419.85 mg g −1 ) for AO II, and could be used as superior SERS substrates for the detection of AO II with a low limit of detection (LOD) of 0.05 mg L −1 and wide detection range of 0.05–50 mg L −1 using portable Raman spectrometer. Furthermore, this SERS assay has been successfully used to determine AO II in orange juice and chili powder with good sensitivities.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Haoyang Xu,Yifan Cheng,Xuen Guo,Yang Wang,Zhiqiang Zhang,Chaoqun Mu,Zhixian He,Yao Wang,Juanqin Xue,Liang Zhang
Photocatalytic reduction technology enables the transformation of highly toxic Cr(VI) into the less hazardous Cr(III), offering an environmentally friendly and sustainable approach to water treatment. This study innovatively proposes a synergistic strategy of "oxygen vacancy engineering–heterostructure construction–biomass loading" to fabricate a three-dimensional OV-Bi 12 GeO 20 /Nb 2 O 5 /CTS composite photocatalyst. The incorporation of oxygen vacancies (OVs) into Bi 12 GeO 20 via a straightforward hydrothermal approach reduces its bandgap from 3.16 eV to 1.50 eV, thereby improving visible light absorption and extending the lifespan of photo-generated charge carriers. Under identical reaction conditions, the photocatalytic reduction efficiency of Bi 12 GeO 20 is only 24.376 %, while that of OV-Bi 12 GeO 20 reaches 67.255 %. Further construction of I-type heterojunction with Nb 2 O 5 further enhances the carrier separation efficiency, and the photocatalytic efficiency of OV-Bi 12 GeO 20 /Nb 2 O 5 is increased to 94.525 %. OV-Bi 12 GeO 20 /Nb 2 O 5 is immobilized onto chitosan (CTS) via a glutaraldehyde cross-linking strategy. Owing to its abundant hydroxyl and amino functional groups, CTS demonstrates strong adsorption capacity for Cr(VI). After 5 cycles of use, its photocatalytic performance remained at approximately 98.35 % of the initial level. Experimental and mechanistic analyses reveal that OVs function as e − traps, promoting the separation of photo-generated charge carriers, while the I-type heterojunction facilitates the efficient reduction of Cr(VI) by enabling directed charge migration.
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产品关联
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Bing Li,Qian Zuo,Zhiyi Deng,Jianhua Cheng,Ping Li,Jinhua Wu
Surface passivation caused by Fe-Cr precipitates limits the application of milli-sized zero-valent iron (mFe 0 ) in filter tanks for Cr(VI) removal. A mFe 0 -based column was established using sand as dispersing media, coupled with a micro-electric field (MEF, 1.2 mA/cm 2 ), to accelerate iron corrosion and enhance Cr(VI) sequestration. A control column without MEF was employed for comparison. Surface analysis verified that the MEF induced mFe 0 particles into three-electrodes with bipolar charges and facilitated electron transfer from iron-core to surrounding O 2 /H 2 O. Ferrous ions from iron corrosion afterwards reduced Cr(VI) and precipitated into secondary minerals (e.g., magnetite, lepidocrocite, and green rust). These minerals effectively sequestered Cr(VI) in their matrices through adsorption-reduction/precipitation on Fe 0 and sand surfaces. Compared to the mFe 0 column, the MEF-mediated mFe 0 (MEF-mFe 0 ) column demonstrated a 2.5-fold increase in kinetic rate constant and a 10-fold decrease in Cr(VI) migration rate, leading to a 9.5-fold augment in Cr(VI) sequestration capacity and a 3.7-fold extension in longevity. Under different hydraulic retention times and influent concentrations, the MEF-mFe 0 column outperformed the mFe 0 column with 6.0 to 9.6-fold higher Cr(VI) sequestration and 3.5 to 5.7-fold longer lifespan. Our study revealed that MEF-assistance represented a promising approach to enhance mFe 0 activation for subsequent Cr(VI) sequestration from water.
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产品关联
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Xiaorui Wang,Lingxing Zan,Hongling Zhang,Kun Tian,Dan Zhu,Jian Li,Qiang Weng,Cuicui Wang,Qingbo Wei,Wenlin Zhang,Xiangyang Hou,Feng Fu
s Rationally regulating the inevitable dynamic evolution of the catalyst surface structure towards high efficiency for water electrolysis remains a significant challenge. Here, the ternary cobalt-iron-chromium double hydroxide (DH) was synthesized on nickel foam as a monolithic catalytic electrode (CoFeCr-DH/NF) for the oxygen evolution reaction (OER) via a simple electrodeposition technique. The optimized Co 0.7 Fe 0.3 Cr-DH/NF electrode exhibited remarkable catalytic activity and stability. The overpotential at the current density of 100 mA cm −2 is only 281 mV, far exceeding those of other monolithic catalytic electrodes. Furthermore, we elucidated the variations in the valence states of metals during the OER process and found the electrochemical oxidation of Co 2+ to Co 3+ and leaching of Cr. Importantly, Cr-leaching can induce surface reconstruction, which not only optimizes the surface electronic structure to enhance the intrinsic activity but also increases the surface irregularity to enlarge the electrochemically active surface area, thereby significantly improving the OER performance. Theoretical calculations revealed that OER preferentially occurred at the adjacent Cr-leached Co sites and confirmed that the Cr-leached trimetallic CoFeCr-DH performs an outstanding OER performance.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xiaoqi Liu,Yanyun Zhang,Yan Liu,Ting'an Zhang
In this paper, a novel grafted zeolite/Fe 3 O 4 /chitosan (ZMC-MAH-TEPA) adsorbent was greenly synthesized and evaluated for the removal of Cr(VI) and Ag(I) in single and bi-component solutions. The characterization data of XRF , XRD, FT-IR, VSM, TGA , BET and SEM showed the successful fabrication of the adsorbent with abundant -NH 2 and -NH- as well as great recovery properties (11.70 emu/g). The effects of experimental parameters, including pH value, initial concentration, temperature, time, and coexisting ions on single and bi-component adsorption, were investigated. The results demonstrated that the adsorption capacities increased with the enhanced shaking time and concentration until equilibrium was reached. The optimum pH value was 3 for Cr(VI) adsorption and 5 for Ag(I) adsorption. The maximum adsorption capacities for Cr(VI) and Ag(I) ions, obtained by the Langmuir model, were 50.75 and 70.12 mg·g −1 in single metal solutions and 45.45 and 58.94 mg·g −1 in bi-component metal solutions (Cr(VI)/Ag(I) = 1:1), respectively. Additionally, the adsorption mechanism of Cr(VI) and Ag(I) was explained in terms of electrostatic interaction and hydrogen bonding between metal ions and -NH 2 and -NH- in ZMC-MAH-TEPA. Taken together, this study provides a clean approach to synthesizing chitosan-based adsorbents for the efficient removal of Cr(VI) and Ag(I) ions.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Kangkang Yang,Qilu Yao,Wei Huang,Xiangshu Chen,Zhang-Hui Lu
In this work, a series of Ni 1-x M x (M = Cr, Mo, W) nanoparticles (NPs) have been successfully synthesized via a simple surfactant-aided co-reduction method and employed as highly efficient and cost effective catalysts for hydrogen generation from aqueous solution of ammonia borane (NH 3 BH 3 , AB) at room temperature . It is found that the as-synthesized NiM NPs (M = Cr, Mo, W) exhibit much higher catalytic performance for the hydrolysis of AB as compared to that of pure Ni NPs. In addition, among all the Ni 1-x M x (M = Cr, Mo, W) NPs, the Ni 0.9 Cr 0.1 , Ni 0.9 Mo 0.1 , and Ni 0.8 W 0.2 NPs show the highest catalytic activities with the turnover frequency (TOF) values of 10.7, 27.3 and 25.0 mol H 2 (mol metal min) −1 , respectively. Remarkably, these optimized NiM catalysts can also perform efficiently in the hydrolysis of hydrazine borane (N 2 H 4 BH 3 , HB). The present low-cost and high-performance of the NiM catalysts system may encourage the practical application of AB and HB as the promising chemical hydrogen storage materials .
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Ruixue Shi,Tianbao Liu,Jing Lu,Xiangjing Liang,Andrei Ivanets,Junqin Yao,Xintai Su
Biochar derived from municipal sludge can be applied to adsorption. But it usually requires activation and pickling due to the generation of impurities such as metal oxide particles, which is uneconomical. Here, a facile strategy, acidification-one-step calcination, was developed and sludge-based Fe–C materials with good Cr(VI) removal effect were obtained by regulating the amount of hydrochloric acid . The results show that the adsorption capacity of Fe/C-5 (the best sample) for Cr(VI) was 150.84 mg g −1 . According to the Langmuir isotherm and pseudo-second-order kinetic model, the removal of Cr(VI) by Fe/C-5 is spontaneous and endothermic chemisorption process. In addition, Fe/C-5 has good ability to remove Cr(VI) under the interference of coexisting ions, and has good cycle stability. The removal of Cr(VI) by Fe/C-5 is considered to be synergistic process of adsorption and reduction. The Fe atoms were highly dispersed in Fe/C-5 and tightly bonded with C atoms, which not only strengthened the Cr(VI) adsorption by electrostatic attraction, but also activated the C atoms in the biochar material, so that the C atoms can reduce Cr(VI) to Cr(III) under acidic conditions. This may be due to the fact that acid pretreatment converted the iron in municipal sludge in the form of Fe–O/OH to free Fe 3+ and entered the C lattice during the calcination process. In this work, Fe–C materials with excellent Cr(VI) adsorption capacity were prepared by one-step calcination method, which has important reference significance for the resource utilization of municipal sludge.
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高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Wen Lu,Chen Wang,Wenhui Song,Zhixiong Zhang,Chengde Xie,Jianjun Wang
The heavy metal ion hexavalent chromium (Cr(VI)) in wastewater significantly threatens public health. Heterojunction photocatalysts typically demonstrate high reduction efficiency in water for Cr(VI) contamination. Overcoming the drawbacks of single metal organic frameworks (MOFs) or covalent organic frameworks (COFs), MOF@COF heterostructures inherit the advantages of large porosity, high surface area, and multiple active sites of single components. Herein, we report novel hybrid UiO-66-NH2@HDU-25 heterojunctions based on a condensation reaction. The optimal ratio of UiO-66-NH2@HDU-25 presented significantly superior photocatalytic activity to most reported MOFs and COFs due to heterojunction formation, which promoted charge separation. Under identical conditions, the optimally formulated UiO-66-NH2@HDU-25 could remove over 99% of Cr(VI), approximately 1.8 and 2.6 times the original UiO-66-NH2 and HDU-25 levels. Furthermore, the UiO-66-NH2@HDU-25 (8 : 1) heterojunction demonstrated favorable reusability and stability over five reaction cycles. Various experiments and density functional theory (DFT) calculations investigated the charge carrier transport pathways and possible photocatalytic mechanisms. The Z-scheme mechanism for the photocatalytic Cr(VI) reduction by UiO-66-NH2@HDU-25 was proposed and validated. This work aims to open new horizons for preparing novel photocatalyst heterojunctions with excellent visible light responsiveness for environmental water remediation.
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