ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hao Dong,Shefiu Kareem,Xiao Gong,Jian Ruan,Peng Gao,Xuedong Zhou,Xiaoqing Liu,Xiujian Zhao,Yi Xie
Lead halide perovskite (LHP) nanomaterials have attracted tremendous attention owing to their remarkable optoelectronic properties. However, they are extremely unstable under moist environments, high temperatures, and light illumination due to their intrinsic structural lability, which has been the critical unsolved problem for practical applications. To address this issue, we propose a facile and environmentally friendly ligand-free approach to design and synthesize rod-like CsPb2Br5-embedded Pb(OH)Br with excellent stability under various harsh environments such as soaking in water, heating, and ultraviolet (UV) illumination. Plate-like CsPbBr3- and Cs4PbBr6-embedded Pb(OH)Br powders are first formed by evaporating the solvent in a dispersion of ethanol (or methanol, isopropanol), Cs2CO3, and PbBr2. Upon soaking in water, the plate-like sample undergoes phase transformation from CsPbBr3 and Cs4PbBr6 to CsPb2Br5 and shape conversion from nanoplate to a microrod, leading to the formation of rod-like CsPb2Br5-embedded Pb(OH)Br. The stable Pb(OH)Br coating effectively prevents the luminescent CsPb2Br5 nanocrystals from reacting with water, leading to extremely high aqueous stability of the CsPb2Br5-embedded Pb(OH)Br. The photoluminescence (PL) intensity of the representative CsPb2Br5-embedded Pb(OH)Br sample can maintain 92.2% of the initial PL intensity value even after soaking in room-temperature water for 165 days; in the meantime, the phase and shape are preserved. The typical sample also shows outstanding stability under hot water, UV illumination, and annealing conditions. The ultrahigh aqueous stability, thermal stability, and photostability of the CsPb2Br5-embedded Pb(OH)Br nanomaterials suggest an effective, facile, and environmentally friendly technique to grow perovskite-based nanomaterials for promising practical applications in the optoelectronic field.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Jingjing Sun,Shangqing Chen,Junfeng Wang,Yi Nie
The reduce of the silicon concentration to low level (<5 mg·L −1 ) from the reverse osmosis brine wastewater is challenging and desirable for the maintain the membrane life and performance, as well as the wastewater treatment costs. This work focuses on the removal of silicon from the reverse osmosis brine wastewater by adding FeCl 3 into the plant wastewater for simultaneous Fe(OH) 3 formation and silicon adsorption. The effects of pH, FeCl 3 dosing concentration, reaction time, and temperature on the silicon removal ratio were investigated. It was demonstrated that the silicon removal ratio could reach up to 94% and its residual concentration was 3.2 mg·L −1 , which met the require of water quality in the reverse osmosis system. These results showed that Fe(OH) 3 could effectively be formed by adding FeCl 3 and realize the efficient silicon removal from the reverse osmosis brine wastewater, even when chloride ion (Cl - ), sulfate anion ( S O 4 2 - ) and nitrate ion ( N O 3 - ) were present. Moreover, the adsorption thermodynamics, kinetics and isotherms during the process of the adsorption of silicon from the wastewater by Fe(OH) 3 were studied. The calculated adsorption capacity of silicon could reach 612.74 mg·g −1 , which was much larger than those of reported adsorbents. These results showed that the silicon removal process was spontaneously exothermic and mainly controlled by the physical adsorption and the monomolecular layer adsorption. This simple and cost-effective method could be used for the silicon removal from different kinds of Si-containing wastewater.
研究领域:
环境科学
·
废水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xuan Liu,Chang’an Wang,Tao Zhu,Qiang Lv,Defu Che
In this paper, the simultaneous removal of SO 2 and NO x catalyzed by Fe-Mo mixed oxides at varying Mo/Fe atomic ratios was reported for the first time with the aim of reducing H 2 O 2 consumption and elucidating the roles of Fe and Mo species in the catalytic process. Fe-Mo mixed oxides with varying Mo/Fe atomic ratios were synthesized and the catalytic performances were systematically studied. The catalyst with Mo/Fe atomic ratio of 2.0 exhibited the highest activity, with which removal efficiencies of 89.4 % for NO x and 100 % for SO 2 can be attained at extremely low H 2 O 2 dosage. Products analysis revealed that SO 2 was mainly removed via wet scrubber, while the adequate oxidation resulting from OH radicals was the prerequisite for NO x removal. The redox pair of Fe 2+ /Fe 3+ played a significant role in decomposing H 2 O 2 , while Mo species had double effect on catalytic activity. Higher Mo content resulted in abundant oxygen vacancies and stronger surface acidity, which favored OH formation. However, the excessive Mo content involved severe surface Mo enrichment and remarkably reduced the active sites of Fe species. The H 2 O 2 /Fe-Mo catalyst system showed excellent stability and had a promising prospect for simultaneously removing SO 2 and NO x in coal-fired flue gas.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 10
·B201
·
IF 2.859
Yang Fan,Zijuan Yang,Xinhua Cao,Peifang Liu,Sen Chen,Zhen Cao
Hierarchical macro-mesoporous Ni(OH)2 were prepared by hydrothermal treatment of Ni(NO3)2 with dicyandiamide. This Ni(OH)2 nanostructure can be transformed to mesoporous NiO via calcination at 300°C. The structure, morphology and textural properties of the as-synthesized Ni(OH)2 and NiO were characterized. The electrochemical property and electrochemical sensing performance toward glucose detection were investigated. Owing to the unique macro-mesoporous structure, the Ni(OH)2 nanostructure could provide amperometric sensing of glucose with wide linear range (0.01–8.3 mM), high sensitivity of 243 μA mM cm−2 and low detection limit of 1 μM. Moreover, this glucose sensor also exhibited excellent stability, good selectivity and reproducibility.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Binglin Guo,Yihao Gao,Yongyue Li,Xin Sun,Shuailin Chen,Meicheng Li
Ni(OH)2 has low production cost and high theoretical specific capacity, while on account of the poor electronic conductivity, it shows inferior electrochemical performance including cycling stability and rate capability. This work focuses on a composite material that is in situ grown Ni(OH)2 nanosheets on reduced graphene oxide (rGO), and employing the fewer-defect rGO to build a three-dimensional conductive network provides outstanding conductivity. The specific capacitances (Cm) of the Ni(OH)2/rGO (NHG) electrode are 2776 F·g–1 at 2 A·g–1 and even 1570 F·g–1 at 50 A·g–1, demonstrating remarkable rate capability. It indicates that the combination of the nano grown Ni(OH)2 and rGO conductive substrate shortens the ion diffusion path and increases the electron transfer rate; hence, the composite rate capability has been significantly improved. The composite materials and active carbon were combined to be an asymmetric supercapacitor, which had a high energy density of 39.24 Wh·kg–1 at 1962 W·kg–1. After 10,000 cycles at 5 A·g–1, the capacity retains 91.4%.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yufen Gu,Bobo Guo,Zao Yi,Xianwen Wu,Jiao Zhang,Hua Yang
One decisive factor for the photocatalytic performance of ZnSn(OH) 6 (ZSO) is nanoparticle morphology. However, the mechanism of the well-defined morphology preparation remains unknown, which leads to the systematic investigation of various parameters in the hydrothermal method . Here, shell-like hollow Archimedean ZSO nanocubes were prepared by a hydrothermal method under suitable conditions, with a uniform particle size distribution and superior dispersion. The effects of hydrothermal time, temperature, pH and surfactant on the microscopic morphology and photocatalytic degradation of methylene blue (MB) dye were investigated. The enhanced photodegradation efficiencies ( η ) of MB were 97.7%, 96.3%, 89.6%, and 96.2% for 8 h-ZSO, 120 ℃-ZSO, 2.85-ZSO, and Hexadecyl trimethyl ammonium Bromide-ZSO (CTAB-ZSO), respectively, which strongly depended on the morphology, leading to differences in physicochemical properties, such as bandgap and charge transfer resistance. The results suggested that a single change in hydrothermal time, temperature, pH, or surfactant can effectively improve the microscopic morphology and photocatalytic performance of ZSO, which may pave the way for the ingenious design of other high-performance photocatalysts . A growth mechanism was proposed for shell-like hollow ZSO prepared in an alkaline environment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Fan Xiao,Ming Cao,Yingbo Chen
The synthesis of ultra-thin, uniform and continuous polyamide (PA) membranes is a crucial prerequisite for enhancing their desalination performance. Research has indicated that effectively slowing down the interfacial polymerization (IP) reaction and promoting the interface stability are key strategies for achieving ultra-thin, uniformly nano-structured membranes with excellent performance. Herein, we have demonstrated the successful design of a continuous and uniform PA membrane, ranging from 10 to 20 nm, by utilizing the UiO-66-(OH) 2 n-hexane dispersion as a transition layer to regulate IP reaction and enable efficient water-salt separation. The results showed that the presence of the transition layer facilitated a bidirectional diffusion-contact reaction between the two monomers, resulting in improved interface stability and alleviating the occurrence of severe IP that may lead to heterogeneous membrane structures. As a result, the PA active layers formed through this approach exhibited superior thinness and uniformity compared to those produced via traditional IP methods. Moreover, the transition layer enabled uniform pre-polymerization of UiO-66-(OH) 2 at the reaction interface by pre-exposing it to down-diffusing acyl chloride monomers. This ensured the continuity of membrane structure while creating additional free volume within the membrane. This work presented a scalable method for manufacturing ultra-thin, defect-free, homogeneous, and high-performance nanofiltration membranes.
研究领域:
材料科学
·
膜技术
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Ebrahim Ataeivarjovi,Yubing Liu,Zhigang Tang,Hao Ding,Dong Guo,Xiaofei Song,Guoxun Ben,Mengyue Zhou
The desorption process of CO2 absorbed by the hot-potash-alkali method was studied in this paper. In a traditional hot-potash-alkali process, the temperatures of KHCO3 aqueous solutions are high, moisture vaporization is serious, and energy consumption is high. We proposed that membrane desorption can be used instead of heating desorption and conducted relevant research. PDMS-PTFE-PVDF/PET was used as a composite membrane. The water evaporation considerably declined, and the decomposition conversion rate reduced to 25.5% as the equilibrium liquid-phase concentration decreased. Results show that the PDMS-PTFE-PVDF/PET composite membrane loaded with 1 wt % TiO(OH)2 nanoparticles can be used for membrane desorption, while the decomposition conversion rate of the KHCO3 aqueous solution decreased by only 4.2% after 10 cycles, and the effect was considerably improved. The comprehensive capture energy consumption was about 65% lower than that of the absorption-heating desorption process on account of the positive effect of TiO(OH)2 nanoparticles. Brief calculation, which is based on CO2 concentration tested by a gas analyzer and the linear fitting of the Arrhenius equation, demonstrates that the reaction activation energy can be reduced (Supporting Information).
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
Nanomaterials
·
2021
·Vol. 11
·期 11
·3122
·
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.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 10
·3380-3386
·
IF 3.842
Lixian Han,Jie Liu,Zhengjun Wang,Kun Zhang,Hui Luo,Bo Xu,Xing Zou,Xiao Zheng,Bin Ye,Xibin Yu
Monodisperse ZnSn(OH)6 (ZHS) microcrystallites (MCs) with two morphologies have been prepared through a facile preparation method without complicated steps, or advanced experimental conditions or equipments. The morphology and compositional characteristics of the 3D hierarchitectures (HAs) of ZHS MCs were investigated by various techniques such as XRD, FESEM, TEM, UV-vis spectra, BET, XPS and EPR. In the reaction system the morphology evolution from cube to sphere was controlled by adding a different concentration of NH4OH. Meanwhile, the formation mechanisms of the two ZHS MCs were studied via a series of time-dependent experiments. Interesting, ZHS MCs were self-assembled from irregular-shaped nanoparticles (5–10 nm). The XPS and EPR tests demonstrated oxygen vacancy defects existed in the ZHS MCs. The gas sensors based on ZHS presented a good sensor performance towards HCHO. However, the gas sensors based on of ZHS spherical MCs exhibited a higher response, shorter recovery time and good reproducibility towards HCHO than those of ZHS cubic MCs. More importantly, the best gas sensing properties were found coming from the ∼600 nm spherical ZHS MCs owing to more oxygen vacancy defects, lower band gap energy, and larger active surface area.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 10
·106011
·
IF 2.07
Jie Yang,Bo Ruan,Wang Ni,Lung-Chang Tsai,Ning Ma,Dean Shi,Tao Jiang,Fang-Chang Tsai
Carbon dots (CDs) has been widely applied in LED diodes, sensing and bioimaging. However, the fluorescence property of CDs is limited because of the solid-state aggregation-caused quenching (ACQ). Metal-organic frameworks (MOFs), due to their high surface area, porosity and tunable pore size, are considered suitable hosts to inhibit the ACQ of CDs. Herein, the Zr-MOFs (UiO-66-(OH)2) is chosen as a host to encapsulate CDs. The dual-emitting CDs@MOFs system is constructed, which overcomes the problem of solid-state aggregation-caused quenching of carbon dots to gain the blue-emitting CDs@UiO-66-(OH)2. With the volume of CDs increased, the fluorescence of CDs@UiO-66-(OH)2 has changed simultaneously. When the volume reaches 3 ml, CDs@UiO-66-(OH)2 begin to cause fluorescence quenching. The correlated color temperatures (CCT) of CDs@UiO-66-(OH)2 are transformed from cold light to warm light. That can be further researched in electroluminescent diodes, ion-sensor, environmental monitoring, biological imaging and developments in other related biochemical fields.
研究领域:
材料科学
·
生物成像
·
传感技术
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 16
·3382-3390
·
IF 8.928
Ting Feng,Jing Ding,Haiyan Li,Wei Wang,Bohua Dong,Lixin Cao
Graphical In hot water : CeO 2 /A−Fe(OH) 3 composites synthesized by a secondary water bath at 100 °C exhibit superior photocatalytic activity. A−Fe(OH) 3 increases specific surface area, passivates the surface of CeO 2 , and reduces the activation energy of water oxidation. This work provides a new insight into exploring amorphous cocatalysts to enhance photocatalytic O 2 evolution activity and augment the possibility of overall water splitting based on CeO 2 . Noble-metal-free composites with good photocatalytic property are of great interest. Here, CeO 2 nanorods composites loaded with amorphous Fe(OH) 3 cocatalyst were designed and prepared via a secondary water bath at 100 °C. The as-synthesized CeO 2 /amorphous Fe(OH) 3 composites exhibited superior light photocatalytic activities compared to pure CeO 2 , especially the sample with a loading time of 60 min. The photocatalytic oxygen generation rate could reach to 357.2 μmol h −1 g −1 , and the average apparent quantum yield (AQY) was 24.67 %, which was a 5.5-fold increase compared to the CeO 2 sample. The improvement of photocatalytic performance could be ascribed to three main reasons: First, loading the amorphous Fe(OH) 3 enlarged the specific surface area and passivated the surface of the pristine CeO 2 . Second, the amorphous Fe(OH) 3 ,which acted as a cocatalyst, provided many active sites, and reduced the reaction activation energy. Thirdly, the maximum interface with intimate contact between CeO 2 and amorphous Fe(OH) 3 cocatalyst accelerated the photogenerated charge separation efficiency and thus improved the photocatalytic performance of CeO 2 in photocatalytic water oxidation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）