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
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
Small
·
2024
·Vol. 20
·期 52
·2408373
·
IF 13
Xiaotong Zhou,Songliang Liu,Huaifang Teng,Kun Ma,Weixin Miao,Xuejing Cui,Xin Zhou,Luhua Jiang
Reasonable construction of high activity and selectivity electrocatalysts is crucial to achieve efficient ethanol oxidation reaction (EOR). However, the oxidation of ethanol tends to produce CO species that poison the active centers of the EOR electrocatalysts. Herein, a unique amorphous CrO x -protected defect-rich ultrafine Pd nanowires (CrO x -Pd NWs) is developed. On the one hand, the CrO x layer can act as a protective layer to maintain the structure of the nanowire. On the other hand, it can play the role of OH regulator to optimize the adsorption energy barrier of intermediate species in Pd nanowire, thereby enhancing the ability of the catalyst to resist CO poisoning. The CrO x -Pd NWs exhibit excellent EOR performance with 3.64 times higher mass activity and 50 mV lower CO electro-oxidation potential than commercial Pd black. The results show that the CrO x layer promotes the dissociation of H 2 O into OH ads , while the CrO x transfers electrons to neighboring Pd atoms optimizing the electronic configuration of Pd, thus selectively oxidizing ethanol to acetate and preventing the formation of toxic * CO. This work provides an effective strategy for the synthesis of nanowire materials with oxide/metal interfaces and offers new ideas for the design of catalysts that can efficiently drive EOR.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Genyan Hao,Tao Zhao,Qiang Fang,Yunzhen Jia,Dandan Li,Dazhong Zhong,Jinping Li,Qiang Zhao
Exploring Earth-abundant and efficient electrocatalysts to replace Ir and Ru for the acidic oxygen evolution reaction (OER) is essential to reduce the cost of clean hydrogen production. Here, we show that trace amounts of electronegative non-metallic element fluorine (F)-doped Co3O4 nanoneedles improve the activity and stability of Co3O4. The F-doped Co3O4 nanoneedles supported on carbon paper (F-Co3O4/CP) exhibit an overpotential of 350 mV at 10 mA cm−2 for the acidic OER. In addition, their performance remains consistent after continuous operation for 80 h. Detailed investigations reveal that introducing an anion promotes the enrichment of OH on the surface of Co3O4 and prevents acid corrosion, thereby enhancing the intrinsic OER activity and stability. Theoretical calculations further indicate that F doping can effectively improve electron transfer and optimize the energy barrier for the formation of *OOH intermediates, which significantly improves OER performance. This study provides guidance for designing efficient and stable non-noble metal acidic water oxidation catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 19
·3919-3924
·
IF 3.879
Suli Wu,Yanhui Ning,Jie Chang,Wenbin Niu,Shufen Zhang
Oleic acid together with sodium hydroxide (NaOH) was widely used to control the size, phase and morphology of NaYF4 UCNCs. However, reports are scarce about the modulation of the luminescence intensity and color output of NaYF4 UCNCs by using different amounts of NaOH. Here, we synthesized NaYF4:Yb3+, Er3+ nanocrystals by a hydro/solvent thermal method using oleic acid as ligand with different amounts of NaOH and systematically investigated their upconverted fluorescence spectra. The results indicated that the emission intensity of NaYF4 : Yb3+,Er3+, especially the green emission at 540 nm was dramatically increased as NaOH decreased. The enhancement factors of 540 nm emissions were 48, 42 and 32 for samples prepared with 0 g, 0.2 g and 0.4 g NaOH (the corresponding pH of the reaction solution were 5.9, 6.9 and 7.4), respectively, compared with that of the product prepared with the usually used 0.7 g NaOH (the corresponding pH was 8.3). Importantly, the ratio of green to red (RGR) increased from 0.4 to 5.9 when the pH decreased from 8.3 to 5.9. That is to say, the color output was tuned from orange yellow to nearly pure green. This resulted from the high energy vibration of OH−, which led to nonradiative relaxation from green emission levels (2H11/2 and 4S3/2) to the red emission level (4F9/2) and nonradiative relaxation from the red emission level (4F9/2) to the no emission level (4I11/2) of Er3+.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
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
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 7
·1-11
·
IF 5.3
Zhao Zhihua,Yao Longqi,Zhang Shuaiwen,Shi Qingsheng,Rahmatullah Abu Bakker Md,Wu Lan
Industrialization and agricultural demand have both improved human life and led to environmental contamination. Especially the discharge of a lot of poisonous and harmful gases, including ammonia, ammonia pollution has become a pressing problem. High concentrations of ammonia can pose significant threats to both the environment and human health. Therefore, accurate monitoring and detection of ammonia gas are crucial. To address this challenge, we have developed an ammonia gas sensor using In(OH) 3 /Ti 3 C 2 T x nanocomposites through an in-situ electrostatic self-assembly process. This sensor was thoroughly characterized using advanced techniques like XRD, XPS, BET, and TEM. In our tests, the I/M-2 sensor exhibited remarkable performance, achieving a 16.8% response to 100 ppm NH 3 at room temperature, which is a 3.5-fold improvement over the pure Ti 3 C 2 T x MXene sensor. Moreover, it provides swift response time (20 s), high response to low NH 3 concentrations (≤ 10 ppm), and excellent long-term stability (30 days). These exceptional characteristics indicate the immense potential of our In(OH) 3 /Ti 3 C 2 T x gas sensor in ammonia detection. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Man Zhao,Liwu Qiang,Meng Bai,He Xiao,Li Zhang,Junming Zhang,Tianjun Hu,Baoliang Lv,Shengxiang Wang,Jianfeng Jia
Rational design of Ni-based electrocatalysts for methanol electrooxidation reaction (MOR) and in-depth understanding of their catalytic mechanism remain a challenge. Herein, carbon dots/graphene heterostructure is constructed to load Ni(OH) 2 and the role of carbon dots focuses on regulating distribution and electronic property of Ni(OH) 2 . Regulation mechanism of carbon dots on Ni(OH) 2 for optimizing MOR activity are revealed by in-situ Raman, in-situ FTIR, operando electrochemical impedance spectroscopy, X-ray absorption fine structure (XAFS) spectroscopy, and so on. It’s found carbon dots could disperse Ni species and regulate their distribution configuration. Appropriate amount of carbon dots promotes the formation of highly dispersed CDs&Ni(OH) 2 type. Because of strong interaction between Ni(OH) 2 and CDs, coordination environment and local electronic structure of Ni in Ni-CDs/G can be regulated by carbon dots, leading to phase-ratio variation of α-Ni(OH) 2 /β‑Ni(OH) 2 and d-band center shift of Ni(OH) 2 . For the best Ni-4CDs/G electrocatalyst, more formed α-Ni(OH) 2 lead to d-band center downshift from the E F level and optimized its adsorption of methanol. Ni-4CDs/G shows the specific activity of 299.2 mA cm −2 and mass activity of 3756.5 mA mg −1 at peak current. In water splitting test, lower initial overpotential of 140 mV is found in methanol electrolysis than that in water electrolysis. This opens a new door to regulate the metal-based electrocatalysts by CDs and will inspire more people to explore CDs-based materials for electrocatalytic application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenhui Fang,Tingting Tang,Min Li,Shixian Xin,Ying Wu,Yutao Cao,Zhize Yu,Wei Cui,Zengxi Li,Hong Zhao
Designing catalysts at atomic level fine-tune the electronic structure of surface-active site for efficient water splitting, is a highly desirable approach but also poses significant challenges. This study focuses on the synthesis of a series of electronically tunable metal single-atom (M−SAs) catalysts: M 9 @S-Ni(OH) 2 (M=Pt, Mn, Fe or Cu). Experimental results reveal that introduction of trace S-heteroatoms and metal atoms into Ni(OH) 2 lattice can effectively modulate the electronic structure of M 9 @S-Ni(OH) 2 through modulation of p-d and d-d orbital hybridization, resulting in exceptional performance in water electrolysis. Among M 9 @S-Ni(OH) 2 , Pt 9 @S-Ni(OH) 2 and Fe 9 @S-Ni(OH) 2 exhibit excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance, respectively, the overpotential requiring only 7 mV and 269 mV, respectively, at current density of 10 mA cm −2 . (−) Pt 9 @S-Ni(OH) 2 ||Fe 9 @S-Ni(OH) 2 (+) presents a high current density of 531.07 mA cm −2 at cell-voltage of 1.80 V in overall-water splitting (OWS), which is 14.07 times higher than that of the commercial (−) Pt/C||IrO 2 (+) (37.86 mA cm −2 ) system. This work achieves the development of cost-effective and stable electrocatalysts, offering a solution for large-scale and sustainable water-hydrogen conversion.
研究领域:
催化
·
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiahua Cheng,Linya Fei,Xiaoqing Zhou,Beibei Lu,Zhihui Zhang,Le Chen,Guojian Ji
UiO-66 and its functionalized derivatives (UiO-66-X, X = -OH, -NO 2 , -NH 2 ) were successfully synthesized via a solvothermal method, and their structural integrity and functionalization were confirmed. Hydrogen adsorption experiments and Grand Canonical Monte Carlo (GCMC) simulations demonstrated that UiO-66-OH exhibited the highest hydrogen adsorption capacity. At 300 K and 1 bar, its experimental adsorption capacity reached 0.0301 wt%, representing increases of 29.18 %, 3.44 %, and 19.92 % compared to UiO-66, UiO-66-NH 2 , and UiO-66-NO 2 , respectively. At 77 K and 20 bar, its simulated adsorption capacity reached 2.352 wt%, surpassing UiO-66-NH 2 (2.229 wt%) and UiO-66-NO 2 (1.927 wt%). This superior performance is attributed to optimized pore structure and enhanced functional group interactions, providing new insights for optimizing hydrogen storage in UiO-66 materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
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
危险品化学品经营许可证（带存储）