NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 1
·109-119
·
IF 3.925
Debin Ji,Yao Liu,Xuepeng Wang,Zhiqiang Qiao,Jialiang Yang,Ziheng Bai,Shuxia Guan,Zhandong Li,Hongjun Wu,Yongde Yan
Nuclear energy is widely used as an efficient energy. However, the production of a large amount of uranium-containing wastewater is considerably harmful to the environment. Adsorption is a commonly used method for removing uranium ions from water. In this study, carbon nanotubes (CNTs) were first modified with polyethyleneimine (PEI), and then Ni–Al-layered double hydroxide (LDH) was anchored to CNT-PEI (CNT-P) by using the co-precipitation method to obtain CNT-P/LDH (NO3−). The experimental results indicated that the adsorption process was consistent with Langmuir kinetic adsorption and Sips adsorption isotherm models at the pH of 6. The fit result of the Sips adsorption isotherm model indicated that the adsorption capacity of CNT-P/LDH was 646.6 mg g−1. XPS analyses showed that the adsorption of uranium on CNT-P/LDH mainly involved three aspects. Tests were conducted for different salinities, and the results showed a uranium removal rate of >95% at a salinity of 3.5%.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiang Lv,Yi Gao,Yueshuai Cui,Chen Wang,Gangchui Zhang,Fang Wang,Peijin Liu,Wen Ao
The ignition and combustion properties of n -Al/CuO/kerosene nanofluid fuels are examined, with a focus on the formulation effects of the n -Al/CuO nano-thermite. The DSC data shows the addition of CuO facilitates the exothermic process of n -Al particles, which then promote the n -Al/CuO/kerosene droplets to evaporate. There are two exothermic peaks on the DSC curve of n -Al/CuO (5 %) at 249.3 ℃ and 463.8 ℃, respectively. The burning of n -Al/CuO/kerosene droplets consists of four stages: ignition, d 2 -law combustion, vapor flame extinguishment, and agglomerate burning. During the agglomerate burning stage, n -Al/CuO (5 %)/kerosene shows the minimum ignition delay at 0.057 s and the highest emission spectral intensity. Droplet combustion conforms well to the d 2 -law, and the maximum combustion rate is found for n -Al/CuO (20 %)/kerosene, at 1.287 mm 2 s −1 . The particle size of combustion residues is uniform, and the overall appearance smoothens as the CuO content increases. A new nanofluid fuel with better ignition and combustion properties than traditional nanofluid fuels is proposed.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Qinglong Luo,Mingzhe Dong,Quan Li,Zhijian Wu,Zhong Liu,Jun Li
The selective extraction of lithium from brine by lithium aluminum layered double hydroxides (Li/Al-LDHs) adsorption is used industrially. To maintain the structural and performance stability of the Li/Al-LDHs adsorbent, the Li/Al-LDHs adsorbent can be doped with some high electron density metals such as Fe(III) and regenerated by dilute Li-containing aqueous solution. In this study, we use Fe(III) doping and FeOOH nanocomposite to stabilize the structure of Li/Al-LDHs. The nanocomposites of Li/Al-LDHs, Fe dopped Li/Al-LDHs (Fe-Li/Al-LDHs), and FeOOH were synthesized by the phase-separated sol–gel method and granulated by using crosslinked alginate polymers. The nanocomposites and granulated nanocomposites were characterized by SEM, TEM, XPS, FT-IR, and XRD analyses. The adsorption–desorption performance of the granulated nanocomposites was evaluated with a single LiCl solution and the brine from Da Qaidam Salt Lake. The isotherms, kinetics, and thermodynamics parameters and Arrhenius parameters of the lithium adsorption of the granulated nanocomposites were obtained. At the 80% mass loading of the nanocomposites in the granulation, the granulated nanocomposites statically adsorbed 9.46 mg/g lithium and dynamically 8.18 mg/g lithium from Da Qaidam Salt Lake brine. The Fe(III) doping and nanocomposite with FeOOH reduced the dissolution of the Li/Al-LDHs in the granulated nanocomposites and did not negatively affect the adsorption capacity of the granulated nanocomposites.
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Yuewen Shao,Jie Wu,Zhiyuan Zheng,Mengjiao Fan,Kai Sun,Félix Mérimé Bkangmo Kontchouo,Lijun Zhang,Shu Zhang,Guangzhi Hu,Xun Hu
Production of cyclopentanone (CPO) from biomass-derived furfural is attractive but challenging, as deep hydrogenation or ring-opening of furan ring in furfural over Co-based catalysts hinders the formation of the targeting products. In this study, alloying Co with Fe species in Co–Fe–Al catalysts is proposed for selective conversion of furfural to CPO in water. The formation of CoFe alloy in Co–Fe–Al catalyst weakened the interaction between Co species and the alumina carrier, lowered the adsorption/activation of H 2 , suppressed the formation of especially Brønsted acidic sites, facilitated the electron transfer from Co 0 to Fe species, increased the activation energy for hydrogenation of furfural (from 17.2 kJ mol −1 over Co–Al to 33.4 kJ mol −1 over 1.5Co-1.5Fe-1.0Al), and weakened the adsorption of C C and C–O–C functionalities in furan ring of furfuryl alcohol (FA) on metallic sites. These factors together suppressed deep hydrogenation of furan ring in FA or ring-opening of FA to diols, producing CPO and CPL with total yield of 91.5%, which was attributed to the synergy between hydrogenation and Brønsted acidic sites. In addition, the presence of Fe in Co–Fe–Al catalysts also enhanced the structural stability of Co species, preventing the phase transformation and aggregation of Co species, and rendering the catalyst with superior reusability .
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Junjie Yu,Hui Xu,Dongsheng Wang,Hongyan Sun,Ruyuan Jiao,Yang Liu,Zhiyuan Jin,Shuo Zhang
Most studies on the interaction between coagulation and NOM (natural organic matter) currently focus on pollutant removal and coagulant species distribution, while studies on floc aging are lacking. Investigation onto the effects of floc aging could guide further processes that utilize flocs, such as densadeg sludge recirculation, floc predeposition for ultrafiltration, sludge condensation, and other traditional sludge reflux processes. In this study, flocs generated by Al 13 and AlCl 3 in microparticle- and nanoparticle-containing water were investigated, and the effect of floc aging on NOM was quantified based on several organic matter characterization techniques. Flocs absorb and release organics during aging. The flocs generated from micro-SiO 2 have a significant absorbing effect for LWM-N (low-molecular-weight neutral substances) and protein-like substances, while the absorption of NOM by flocs generated from nano-SiO 2 is insignificant. HS (humic substances) with high aromaticity are released during floc aging. From the molecular perspective, the molecules released during floc aging are those with higher double bond equivalents and higher aromaticity, while the absorbed molecules are those with lower double bond equivalents and lower aromaticity. 2D-COS (two-dimensional correlation spectroscopy) demonstrated that the flocs generated by Al 13 and AlCl 3 had the same organic release patterns but different intensities, while the flocs generated in the micro-SiO 2 and nano-SiO 2 systems had different organics release patterns. Abundant aluminum hydrolysates with low polymerization and amorphous Al(OH) 3 would be produced from AlCl 3 during the coagulation process and then undergo hydroxyl‑bridging reaction and crystallization during floc aging, thus releasing more HS with high aromaticity into the supernatant; in comparison, prehydrolyzed Al 13 produces a more stable floc and releases less HS during aging. The flocs produced by nano-SiO 2 and Al-based coagulants release higher aromaticity HS into the water than those produced by micro-SiO 2 , which may be related to the formation of more highly polymerized degree hydrolysates and nanocrystalline Al(OH) 3 in the nano-SiO 2 system. The flocs generated in water with micro-SiO 2 may contain a large amount of Al-OH and have a loose structure, thus further absorbing NOM, such as protein-like substances and LWM-N. In contrast, the flocs generated from nano-SiO 2 possess abundant adsorbed water and a denser structure; thus, organic matter cannot be absorbed stably.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Man Wang,Jun Wang,Mengjun Li,Xinru Wang,Yating Sima,Qiang Wu
Hexagonal Zn–Al hydrotalcite (Zn–Al LDHs) has become a research hotspot in the field of photocatalysis due to efficient photocatalytic performance, low cost and non-toxicity. In this research, In 2 S 3 /Zn–Al LDHs composites were firstly synthesized by one-pot method with InCl 3 and TAA as raw materials. The crystalline structure, surface morphology , chemical composition, together with optical properties of the samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FT-IR), UV–Vis diffuse reflectance spectrometry (DRS), and Photoluminescence spectra (PL). The photocatalytic performance of the composite photocatalyst was investigated by degradation of tetracycline (TC) under visible-light irradiation. The photochemical properties and cyclic stability of the photocatalyst were further explored. Experimental results display that the photocatalytic efficiency of In 2 S 3 /Zn–Al LDHs (1:2) was remarkably superior to that of pure In 2 S 3 and Zn–Al LDHs. In 2 S 3 /Zn–Al LDHs (1:2) composite showed high photocatalytic activity for TC degradation (92.2% within 30 min). The modification of Zn–Al LDHs by In 2 S 3 prompted the separation of photogenerated electron-hole pairs and thus improved the photocatalytic performance. It can be inferred that the efficient photocatalytic performance of In 2 S 3 /Zn–Al LDHs composites could remove many hazardous pollutants in wastewater.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Liwei Sun,Meilin Yin,Zhen Li,Shaokun Tang
To alleviate environment issues derived from CO 2 emission, developing effective and economical methods for CO 2 capture has attracted much attention for decades. Metal-organic frameworks possess high porosity and stability, which is favorable to the adsorption of small molecules. Herein, an aluminum-based MOF, aluminum terephthalate [MIL-53(Al)], was synthesized with H 2 O and N , N′ -dimethylformamide as co-solvent via microwave-assisted method for CO 2 adsorption. The parameters including pre-mixing mode, microwave temperature, microwave power and reaction time were varied to study their influences on crystal structure, morphology and CO 2 adsorption capacity of MW-MIL-53(Al). Wherein, MW-MIL-53(Al) prepared with pre-mixing mode of stirring at 130 °C, 200 W and 3 h presents high crystallinity and rod-like morphology. The synthesized MW-MIL-53(Al) possesses relatively high BET surface area (961 m 2 /g), pore volume (0.46 cm 3 /g) and thermal stability (up to 480 °C), and its CO 2 adsorption capacity is 2.16 mmol CO 2 /g adsorbent under 25 °C and 0.1 MPa, which is higher than CS-MIL-53(Al) synthesized via conventional solvothermal method at 130 °C for 48 h.
✓ 已验证
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Lincai Peng,Xin Huangfu,Yao Liu,Huai Liu,Junhua Zhang
The processing of C6 sugars to alkyl levulinate (AL), a versatile biomass-derived building block, can be readily implemented via the straightforward acid-catalyzed reaction in alcohol medium while it remains a challenge to produce AL from C5 sugars in the one-pot procedure over a monolithic catalyst. In this contribution, a budget and multifunctional natural lignocellulose welded Zr–Al bimetallic hybrid (ZrAl@CS-MSA) has been successfully constructed with crude corn stalk as a sustainable support. The becoming Lewis and Brønsted acid sites of ZrAl@CS-MSA catalyst guarantee a high AL yield of 54.3% from xylose via a one-pot process in a renewable n -butanol medium. Experimental findings revealed that the sulfonic group of ZrAl@CS-MSA plays a significant role in the xylose dehydration, furfuryl alcohol etherification and alcoholysis reactions while Zr species is in charge of the transfer hydrogenation of furfural. The Al species enclosed in ZrAl@CS-MSA can regulate its Brønsted and Lewis acidity, accelerating the etherification and alcoholysis reactions as well as alleviating the over hydrogenation of AL. This work opens a green, sustainable and reliable avenue for producing C5 sugar-based AL using natural lignocellulose-related multifunctional catalysts.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Ru-Kun Ding,Xiao-Song Zhang,Lan Li,Jian-Ping Xu,Li-Na Kong,Xiao-Kai Gong,Hao Yin,Zhao-Wei Zhang,Qian Li,Long Liu
Lead halide perovskites have received extensive attention due to their excellent photoelectric and photonic properties. However, low stability is an obstacle to material production and optoelectronic applications. In this research study, CsPbBr3/Cs2SiF6:Mn4+ rivet nanostructured perovskites coated with ZnS and self-passivation layers have been synthesized. The rivet nanostructured perovskites are applied in tunable white light-emitting diode (WLED) devices and tunable flexible white electroluminescent (EL) devices. The red and green dual-wavelength tunable luminescence in the rivet nanostructured perovskites has been obtained via Cs ion sharing. Upon the addition of ZnS and a self-passivation aluminum layer coating on the surface of the rivet perovskites, the photoluminescence (PL) intensity and the stability increased by 588.7 and 323.6%, respectively. In addition, a series of spectrally tunable WLED devices with an InGaN blue LED chip and flexible white EL devices is fabricated using the CsPbBr3/Cs2SiF6:Mn4+/2ZnS/Al rivet nanostructured perovskites. The tunable WLED devices can produce standard white light and cold and warm white light. The tunable EL devices produce luminescence even at 60° bending. By studying the temperature-dependent PL spectra of CsPbBr3/Cs2SiF6:Mn4+/nZnS/Al rivet nanostructured perovskites, the energy transfer mechanism at cryogenic and room temperatures is analyzed. At the same time, the protection principle of the self-passivation coating on the CsPbBr3/Cs2SiF6:Mn4+ rivet nanostructured perovskites is discussed.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 9
·1764-1772
·
IF 3.756
Zhenzhen Cui,Lei Zhao,Ting Wang,Jiangyan Cao,Yufang Qiao,Chaojie Pi,Zhaohui Fang,Jianbei Qiu,Xuhui Xu,Xue Yu
The up-conversion features of lanthanide-doped nanocrystals endow them with promising application potential in optical encoding, optical temperature sensing, bioimaging, diagnostics, and therapeutics. Here, tailoring the local structure to enhance the up-conversion luminescence intensity was achieved through chemical substitution with Al in KYbF4: Er3+ up-conversion nanoparticles (UCNPs). Moreover, the as-explored KYb0.98-xAlxF4: 0.02 Er3+ exhibits a superior temperature-dependent up-conversion performance. Herein, the relative sensitivity of the 2H11/2/4S3/2 thermally coupled levels (TCLs) and 4F9/2/4S3/2 non-thermally coupled levels (NTCLs), particularly below the room temperature, was evaluated. This indicates the potential application of the as-explored UCNPs with improved up-conversion performance as an optical temperature sensor for low temperature detection.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 11
·1396
·
IF 2.881
Min Zhang,Dong Peng,Feifei Peng,Anwei Huang,Kaiqiang Song,Qingbing He,Changqing Yin,Jinsong Rao,Yuxin Zhang,Haitao Chen,Dalong Cong,Zhongsheng Li
The Al coatings were electrodeposited on the Cu substrate from AlCl3-EMIC ionic liquid (AlCl3:EMIC = 2:1 molar ratio) containing three cyanopyridine additives with different positions of the substituent group on the pyridine ring, which were 2-cyanopyridine, 3-cyanopyridine, and 4-cyanopyridine. The effects of cyanopyridine additives on the deposition potential, morphology, brightness, and corrosion properties of Al coatings were investigated. It was considered that the deposition potential of Al shifted to more negative overpotentials, the quality of Al coatings was promoted, and the corrosion property was improved by the cyanopyridine additives to a varying degree. Especially in the presence of 4-cyanopyridine, the flattest mirror bright Al coating was obtained, which had the smallest homogeneous nanocrystal grain size and strongest Al (200) crystallographic orientation. The average roughness Ra value was as low as 31 nm compared to that in the absence of cyanopyridine additives, which was 417 nm. Furthermore, the corrosion current density of the bright Al coating was three orders of magnitude lower than the rough Al coating, which resulted from the dense nanocrystal structure.Keywords:bright Al;electrodeposition;ionic liquids;cyanopyridine;additives
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 24
·7889
·
IF 3.623
Lixiang Zhu,Meishuai Zou,Xiaodong Zhang,Lichen Zhang,Xiaoxuan Wang,Tinglu Song,Shuo Wang,Xiaodong Li
The main problem for the application of hydrogen generated via hydrolysis of metal alloys is the low hydrogen generation rate (HGR). In this paper, active Al alloys were prepared using a new coupled method-melting-mechanical crushing-mechanical ball milling method to enhance the HGR at room temperature. This method contains three steps, including the melting of Al, Ga, In, and Sn ingots with low melting alloy blocks and casting into plates, then crushing alloy plate into powders and ball milling with chloride salts such as NiCl2and CoCl2were added during the ball milling process. The microstructure and phase compositions of Al alloys and reaction products were investigated via X-ray diffraction and scanning electron microscopy with energy dispersed X-ray spectroscopy. The low-melting-point Ga-In -Sn (GIS) phases contain a large amount of Al can act as a transmission medium for Al, which improves the diffusion of Al to Al/H2O reaction sites. Finer GIS phases after ball milling can further enhance the diffusion of Al and thus enhance the activity of Al alloy. The hydrogen generation performance through hydrolysis of water with Al at room temperature was investigated. The results show that the H2generation performance of the Al-low-melting point alloy composite powder is significantly higher than the results reported to date. The highest H2generation rate and H2conversion efficiency can reach 5337 mL·min−1·g−1for the hydrolysis of water with 1 g active alloy.Keywords:aluminum alloys;melting-crushing-ball milling;hydrogen generation performance;hydrogen storage
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）