INORGANIC CHEMISTRY
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2024
·
IF 4.3
Mengzeng Wu,Jingui Xu,Dongzhou Zhang,Yi Zhou,Wei Chen,Shanrong Zhang,Qifa Zhong,Dawei Fan
Layered materials have attracted extensive attention due to their exceptional physical and chemical properties. Understanding the structural evolution of such materials under high pressure is crucial for the development of new functional materials. In this study, the structure evolution of the synthesized layered rare-earth hydroxyhalide YCl(OH)2 under high pressures up to approximately 9.4 GPa was explored by using a diamond anvil cell combined with synchrotron single-crystal X-ray diffraction. Simultaneously, high-pressure Raman spectroscopy experiment was conducted to 10.3 GPa. Our findings indicate that YCl(OH)2 maintains its symmetry within the experimental pressure range. The pressure–volume data of YCl(OH)2 were fitted to the third-order Birch–Murnaghan equation of state (EoS) to derive its EoS parameters including zero-pressure unit-cell volume (VT0), isothermal bulk modulus (KT0), and its pressure derivative (K’T0): VT0 = 142.47 (1) Å3, KT0 = 38.2 (18) GPa, and K’T0 = 9.8 (1). However, the unit-cell parameters a, b, and c exhibit a distinct compressional behavior, with the a-axis being the most compressible and the b-axis being the least. Particularly noteworthy is the observation that YCl(OH)2 displays a negative linear compressibility along the b-axis within the pressure range of 0.4–5.3 GPa. Further detailed structure refinement and Raman spectroscopy analyses indicate that the anomalous behavior of the b-axis could be attributed to the formation of the O–H···O hydrogen bonding chains along the b direction. Moreover, the coordination number of Y3+ increased from 8 to 9 as the pressure reached 5.3 GPa due to the reduction of the interlayer spacing upon compression, ultimately leading to the closure of the interlayer gap.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yonghao Wang,Biao Chi,Chengliang Xiao,Dagui Chen,Yongjing Wang,Minghua Liu
In this work, a layered nanocomposite with a superior adsorption ability has been designed and prepared for the preconcentration of Eu(III), a chemical analogue of trivalent lanthanides [Ln(III)] and actinides [An(III)] in nuclear waste. This nanocomposite was obtained by fabricating magnesium silicate (MgSi) of the Talc-phase Mg 3 Si 4 O 9 (OH) 10 on graphene oxide (GO) nanosheets, in which the GO matrix can effectively avoid the agglomeration of MgSi. A hierarchical structure of GO@MgSi with interwoven nano-sized MgSi lamellae dispersedly standing on the surface of GO was observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Such a hierarchical structure effectively increases the surface area of MgSi, leading to up to date the highest adsorption capacity (344.82 mg·L −1 ) for enriching Eu(III). Powder X-ray diffraction pattern (PXRD) of Mg 3 Si 4 O 9 (OH) 10 shows that the (0 2 0) and (2 0 0) diffraction peaks disappear after the adsorption of Eu(III), indicating structural changes in MgSi lamellae after adsorption. The infrared absorption spectra (IR) and X-ray photoelectron spectroscopy (XPS) measurements confirm the structural transformations in the Si O tetrahedral and Mg OH octahedral sheet in MgSi, suggesting that MgSi lamella rather than GO sheet might play a dominant role during the adsorption process. The superior adsorption behaviors of GO@MgSi indicate that it is a highly promising and efficient candidate for Eu(III) preconcentration in aqueous solution.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
·
IF 5.018
Qiangqiang Xiao,Wenhui Yuan,Li Li,Tao Xu
Latent thermal energy storage using phase change material (PCM) is an effective way to store and transport energy. In this work, expanded graphite was modified using octylphenol polyoxyethylene ether to generate modified expanded graphite (MEG), and then a novel shape-stabilized Ba(OH) 2 ·8H 2 O/MEG composite PCM was synthesized by incorporating Ba(OH) 2 ·8H 2 O into MEG matrix. Mass fractions of Ba(OH) 2 ·8H 2 O in composite PCM were calculated from 74% to 93%. The effects of MEG on properties of PCM were investigated using scanning electron microscopy, X-ray diffraction, differential scanning calorimetry and thermal constant analyzer. The results indicated that MEG had the desired compatibility with Ba(OH) 2 ·8H 2 O. The phase separation of Ba(OH) 2 ·8H 2 O was effectively inhibited by the MEG matrix and the supercooling temperature decreased from 13 °C for Ba(OH) 2 ·8H 2 O to 2.4 °C for composite PCM with a MEG matrix density of 200 g/L. At the same matrix density, the thermal conductivity of composite PCM reached 3.58 W/(m K), 1.84 times higher than that of Ba(OH) 2 ·8H 2 O. The latent heat was approximately equal to the product of the latent heat of Ba(OH) 2 ·8H 2 O and its mass fraction. Moreover, the enthalpy loss of the composite PCM was negligible after 400 cycles, showing good thermal reliability.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Lu Qin,Peng She,Panlong Si,Suqin Liu,Gaopeng Dai,Cong Pan
Photocatalytic production of H 2 O 2 is indeed a safe, sustainable and cost-effective technology, offering an environmentally friendly solution to the energy crisis through solar photocatalysis. However, it still faces challenges such as reliance on organic electron donors and pure O 2 , as well as inefficiencies in hole utilization. To overcome these limitations, a dual-channel photocatalytic system has been developed. In this study, we showcase the efficiency of the CuO/Cu(OH) 2 @g-C 3 N 4 composite, derived from CuBTC/g-C 3 N 4 via NaOH treatment, as a high-performance dual-channel photocatalyst for H 2 O 2 production. Under visible light (λ ≥ 420 nm), this composite achieves a H 2 O 2 yield of 1354 μmol/L in 120 min without any sacrificial agent, outperforming g-C 3 N 4 by 8.4 times, CuO by 13.6 times and CuO@g-C 3 N 4 by 1.9 times. Quenching experiments and electron paramagnetic resonance spectra confirmed that HO • and O 2 •− are intermediate products in the photocatalytic process, following a two-step single-electron reaction pathway. The superior activity of CuO/Cu(OH) 2 @g-C 3 N 4 in H 2 O 2 generation can be attributed to the synergistic effects of OH bonds on the CuO@g-C 3 N 4 Z-type heterojunction and Cu(OH) 2 . This research presents a straightforward and promising approach for developing highly efficient photocatalysts for energy conversion.
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RARE METALS
·
2024
·
IF 9.6
Li Zhao-Yang,Zhao Wei-Jun,Sun Yu,Zhou Bing,Feng Yue-Zhan,Liu Chun-Tai
The pressing demand for ultrathin and flexible shields to counter electromagnetic interference (EMI) has sparked interest in Ti 3 C 2 T x MXene materials due to their exceptional electrical conductivity, tunable surface chemistry, and layered structure. However, pure Ti 3 C 2 T x MXene films often lack the mechanical properties required for practical engineering applications, and traditional reinforcement methods tend to reduce electrical conductivity. This work demonstrates an effective strategy to enhance the alignment and densely packed layered structure of Ti 3 C 2 T x MXene films by regulating the acidity and alkalinity of Ti 3 C 2 T x MXene aqueous solutions. This approach simultaneously improves mechanical strength and electromagnetic interference shielding effectiveness (EMI SE). Compared with original Ti 3 C 2 T x MXene films, MXene films modified with ammonia solution (NH 3 ·H 2 O) via OH − show a significant improvement in tensile strength (27.7 ± 1.9 MPa). Meanwhile, MXene films treated with hydrochloric acid (HCl) via H + reach an even higher tensile strength of 39 ± 1.5 MPa. Moreover, the EMI SE values of the treated MXene films increase significantly, each reaching 66.2 and 58.4 dB. The maximum improvements in EMI SE values for the acid- and alkali-treated samples are 17.9% and 4%, respectively. In conclusion, the simultaneous enhancement of mechanical strength and EMI shielding efficacy highlights the potential of acid- and alkali-treated Ti 3 C 2 T x MXene films for applications in ultrathin and flexible EMI shielding materials. Graphical abstract
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Cengceng Du,Zhenyu Wang,Yiming Wang,Wenjuan Xu,Yuqiu Huo,Hongbin Sun,Guangwen Xu
Constructing an environmentally friendly and efficient electrocatalyst holds important and profound significance for energy-efficient hydrogen production. Replacing the oxygen evolution reaction with a lower potential urea oxidation reaction (UOR) may save energy in water electrolysis to produce hydrogen. The UOR is characterized by its high energy barrier, which results in slow reaction kinetics. In this study, we introduced Ba(OH)2 into Ni(OH)2 to form uniform nanosheets. Due to the introduction of Ba2+, the lattice expansion of Ni(OH)2 was triggered, leading to significant improvement in UOR activity. The catalyst achieved a current density of 100 mA cm−2 at only 1.316 V and exhibited remarkable stability over time. Density functional theory (DFT) calculations demonstrate that the Ba–Ni(OH)2 site significantly reduces the energy barrier for urea adsorption, intermediate steps, and desorption. This work provides a novel and environmentally friendly strategy for constructing energy-efficient and highly efficient catalysts through the doping of alkaline earth metals.
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Small
·
2025
·
IF 12.1
Shaojian Jiang,Yuhang Liu,Ruidong Yang,Lijun Zhang,Wenke Liu,Kai Deng,Hongjie Yu,Hongjing Wang,Liang Wang
Since formaldehyde oxidation reaction (FOR) can release H 2 , it is attractive to construct a bipolar hydrogen production system consisting of FOR and hydrogen evolution reaction (HER). Although copper-based catalysts have attracted much attention due to their low cost and high FOR activity, the performance enhancement mechanism lacks in-depth investigation. Here, an amorphous-crystalline catalyst of amorphous nickel hydroxide-coated copper dendrites on copper foam (Cu@Ni(OH) 2 /CF) is prepared. The modification of Ni(OH) 2 resulted in hydrophilic and aerophobic states on the Cu@Ni(OH) 2 /CF surface, facilitating the transport of liquid-phase species on the electrode surface and accelerating the release of H 2 . The Open circuit potential (OCP) and density functional theory (DFT) calculations indicate that this core–shell structure facilitates the adsorption of HCHO and OH − . In addition, the catalytic mechanism and reaction pathway of FOR are investigated through in situ FTIR and DFT calculations, and the results showed that the modification of Ni(OH) 2 lowered the energy barrier for C─H bond breaking and H─H bond formation. In the HER//FOR system, Pt/C//Cu@Ni(OH) 2 /CF can provide a current density of 0.5 A cm −2 at 0.36 V and achieve efficient and stable H 2 production. This work offers new ideas for designing electrocatalysts for bipolar hydrogen production system assisted with formaldehyde oxidation.
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Science China-Chemistry
·
2010
·Vol. 53
·期 7
·1497-1501
·
IF 0
Ma Hong,Nie Xin,Cai JiaYing,Chen Chen,Gao Jin,Miao Hong,Xu Jie
The catalytic oxidation of biomass-derived polyhydroxyl compounds provides an efficient and green route for biomass resource utility. Gold nanocrystals supported on Mg(OH) 2 were synthesized by sol-immobilization method, characterized by XRD, TEM, UV-vis DRS, and tested in the selective oxidation of 1,2-propanediol to lactic acid. The gold particle size and the ratio of Au to 1,2-propanediol strongly influenced the catalytic activity. Over Au/Mg(OH) 2 with the majority of gold particles concentrated in 14–18 nm, excellent catalytic performance with 94.4% conversion and 89.3% selectivity to lactic acid has been achieved under 0.3 MPa O 2 at 60 °C for 6 h.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 46
·45431
·
IF 1.86
Ya Liu,Peng Qian,Yang Yu,Li Xiao,Yongliang Wang,Shufeng Ye,Yunfa Chen
Heavy metal ions such as Cu 2+ and Pb 2+ impose a significant risk to the environment and human health due to their high toxicity and non-degradable characteristics. Herein, Al(OH) 3 -polyacrylamide chemically modified with dithiocarbamates (Al-PAM-DTCs) was synthesized using formaldehyde, diethylenetriamine, carbon disulfide, and sodium hydroxide for rapid and efficient removal of Cu 2+ and Pb 2+ . The synthesized adsorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis, scanning electron microscopy–energy dispersive X-ray spectroscopy analysis, and transmission electron microscope measurements. Al-PAM-DTCs showed rapid removal of Cu 2+ (<30 min) and Pb 2+ (<15 min) with high adsorption capacities of 416.959 mg/g and 892.505 mg/g for Cu 2+ and Pb 2+ respectively. Al-PAM-DTCs also had high capacities in removing suspended solids and metal ions simultaneously in turbid bauxite suspensions. FTIR, thermodynamic study, and elemental mapping were used to determine the adsorption mechanism. The rapid, convenient, and effective adsorption of Cu 2+ and Pb 2+ indicated that Al-PAM-DTCs has great potential for practical applications in purification of other heavy metal ions from aquatic systems. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45431.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Peng-Fei Qiu,Xiu-Niang Tan,Zai-Yin Huang,Yan Zhou
The low conductivity of many traditional metal–organic-framework (MOF)-based electrode limits their developments in the field of electrochemical energy storage and still of great challenge. The controllable preparation of various kinds of nanomaterials using thiol-functionalized MOF shows great prospects. In this work, a thiol-functionalized metal–organic framework sheet structure ( Co-MOF/NF ) on nickel foam was successfully prepared by in situ interfacial growth synthesis, which was transformed into its derivatives S-doped β-Co(OH) 2 nanoflowers Co-x/NF ( x = 1, 2 and 6) in different concentrations of KOH solutions through ion etching/exchange reaction. The pristine thiol-functionalized Co-MOF/NF and its derivatives Co-x/NF ( x = 1, 2 and 6) nanoflower-like arrays could be used as positive electrode materials for effective supercapacitors. Among them, the transformation of the nanoflower-like Co-1/NF electrode exhibits excellent electrochemical properties with high areal capacitance (1925 ± 23 mF/cm 2 at 1 mA/cm 2 ), good rate performance, excellent conductivity and decent cycling stability. The Co-1//AC ASC device provides a high energy density of 0.176 mWh/cm 2 (92.6 Wh/kg) at a power density of 0.745 mW/cm 2 (392.1 W/kg). And this Co-1//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This study provides a new strategy for the pristine thiol-functionalized MOF and its conversion nanostructures for energy storage applications.
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WATER RESEARCH
·
2025
·
IF 12.4
Yuanna Zhang,Wenjun Sun,Wenxuan Yin
The widespread application of UV/H 2 O 2 is limited by the empirical operational practices, which can lead to excessive energy, chemical input and the generation of uncontrollable by-products. This study presents a precise regulation approach based on the characteristics of free radical generation/reaction and the chemical transformation of organics, assessed through a pilot experiment. The findings indicated that increasing H 2 O 2 dosage was more effective than increasing UV dose in enhancing •OH generation and pollutant removal. As the H 2 O 2 dosage and UV dose increased, the relative influence of water quality on pollutant removal gradually diminished. Dissolved organic matter (DOM) in the water quality background accounted for the largest proportion of •OH scavenging (76.4 %) and the most complex component. Moreover, changes in operating conditions were accompanied by the uncontrollable production of low-molecular-weight (LMW) DOM. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) revealed the chemical transformation of LMW DOM at the molecular level. Higher H₂O₂ dosages triggered more extensive oxidative degradation, resulting in more complex effluent compositions. Considering treatment efficiency, energy consumption, and effluent product composition, H₂O₂ dosages of 5–10 mg/L and UV doses of 350–450 mJ/cm² were identified as optimal. This research contributes to the efficient purification of organic micropollutants in water using UV/H 2 O 2 technology with low energy consumption, minimal chemical input, and relatively controllable by-products.
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FUEL
·
2024
·
IF 6.7
Xiao Chen,Rongrong Li,Zhengwen Hu,Ying Zhong,Deng Hu,Changhai Liang
The selective activation of targeted bonds within renewable biomass-derived furanic compounds for the production of high-value alkyl diols holds significant importance for biomass upgrading, necessitating well-defined catalysts and clearly defined catalytically active sites. Herein, 1,5-pentanediol is synthesized through the selective hydrogenolysis of furfural-derived tetrahydrofurfuryl alcohol utilizing Ni-Co/La(OH) x bimetallic catalysts. The La(OH) x with abundant defect sites polarizes Ni-Co alloy for heterocracking of H 2 , as well as leads to expose more interfacial NiCo-O V -La 3+ sites. By harnessing the synergistic interplay between the alloy sites and the interfacial sites, the optimized Ni 4 Co 1 /La(OH) x bimetallic catalyst markedly enhances the adsorption of –OH groups in tetrahydrofurfuryl alcohol and facilitates the selective assault of active H species on the C-O-C bonds within tetrahydrofuran rings. This approach markedly elevates the selective hydrogenolysis of tetrahydrofurfuryl alcohol to 1,5-pentanediol, attaining an exceptional selectivity of 88.6 % with a conversion of 98.1 % for tetrahydrofurfuryl alcohol. Furthermore, the Ni 4 Co 1 /La(OH) x bimetallic catalyst demonstrates exceptional performance in the one-pot hydrogenation-hydrogenolysis of furfural to 1,5-pentanediol, exhibiting a low activation energy of 17.77 kJ/mol and a high turnover frequency of 192.1 h −1 . Notably, the Ni 4 Co 1 /La(OH) x bimetallic catalyst showcases remarkable stability. This outcome provides invaluable insights for the advancement of a sustainable process to produce diol monomers from renewable resources with a low carbon footprint.
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