DESALINATION
·
2025
·
IF 9.8
Minfu Mo,Yaling Lin,Danni Lin,Xiaojuan Ma,Yubin Hong,Lihui Chen,Dong Wang,Liulian Huang
Cellulose acetate (CA) has attracted much attention in the preparation of ultrafiltration membranes due to its green and sustainable characteristics. However, its poor performance (separation and antifouling performance, etc.) limits the application of CA-based membranes in water treatment. In this work, we prepared a cellulose acetate ultrafiltration membrane with enhanced separation performance by enhancing the dissolution process of CA. The dissolution process of CA was controlled by adjusting the ratio of mixed solvent ( N , N -dimethylacetamide (DMAC) and N -methyl pyrrolidone (NMP)), which could tune the phase conversion rate, optimizing the pore structures of the membranes. Compared to the single solvent (M0, M8), the optimal membrane (M4) exhibited a finger-like pore structure and the lowest surface roughness, which was favorable for achieving high water flux. As a result, the M4 possessed a comparable pure water flux (335.8 L·m −2 h −1 ) which was higher than M0 (1.8 times) and M8 (1.7 times), while the BSA rejection rate reached 96.4 %. Besides, the M4 showed a stable separation performance in different operation pressures, BSA concentration, and long-term experiments. This work provided a new method for the preparation of cellulose acetate ultrafiltration membrane with good separation performance and anti-fouling performance and also provides a new way for water treatment.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 29
·10206-10213
·
IF 4.39
Wenyao Zhang,Wenqi Jin,Meng Cheng,Ruonan Zhang,Zhihua Yang,Shilie Pan
Fluorine-containing compounds significantly enrich the diversity of inorganic chemical structures. Here, four alkaline-earth metal difluorophosphates with different space groups, namely NH4Mg(PO2F2)3 (Cmcm) (1), NH4Sr(PO2F2)3 (P) (2), (NH4)2Ba(PO2F2)4 (P2/n) (3) and Ba(PO2F2)2 (I2d) (4), were synthesized and their structures were determined for the first time. 4 is not only the first alkaline-earth-metal difluorophosphate, but also the first difluorophosphate reported to crystallize in the non-centrosymmetric space group I2d of the tetragonal crystal system. All of the three-dimensional (3D) structures of the title compounds consist of isolated (PO2F2)−, AE–O and NH4+ units, while the differences of the cation radius result in various arrangements of the (PO2F2)− units, which leads to diverse crystal structures and the disparate optical anisotropy of the crystals. According to the deep-ultraviolet (DUV) transmittance spectrum, 3 exhibits a short DUV cut off edge (<180 nm). Solid state 19F and 31P magic-angle spinning NMR spectroscopy was used to verify the presence of covalent P–F bonds in 3. The different size effects, as well as the coordination environments of the Mg2+, Sr2+, and Ba2+ cations, on the structures as a whole have been discussed in detail. In addition, the calculated birefringence values were observed to differ from 0.011 to 0.033 for the four compounds.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Meiwen Zhang,Yuqian Guo,Leilei Hou,Yun Cheng,Linghua Chen,Mengnan Cao,Hongjie Zhang
Efficient dissolution of cellulose is a critical initial stage in converting it into high value materials. In this study, we developed a rapid pretreatment method based on microwave-assisted deep eutectic solvent (MW-DES) technology to markedly reduce the dissolution time of dissolving pulp fibers in N -methylmorpholine-N-oxide (NMMO). Specifically, treatment with a ZnCl 2 /H₃PO₄ system under microwave irradiation at 200 W for 4 min effectively disrupted the hydrogen-bond network of cellulose. This treatment increased the specific surface area by 124% and reduced cellulose crystallinity from 64.06% to 44.63%. Owing to the synergistic pretreatment, the complete dissolution time in NMMO decreased to 12 min, a 60% reduction compared to the 30 min required following microwave-water (MW-water) pretreatment, and demonstrated a significant enhancement in dissolution efficiency. This approach provides a novel, sustainable strategy for the efficient pretreatment of dissolving pulp, thereby supporting the industrial production of Lyocell fibers.
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高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Meilin Lv,Gang Liu,Xiaoxiang Xu
Strong visible light absorption and high charge mobility are desirable properties for an efficient photocatalyst, yet they are hard to be realized simultaneously in a single semiconductor compound. In this work, we demonstrate that these properties coexist in homologous compounds ZnnIn2O3+n (n = 4, 5, and 7) with a peculiar layered structure that combines optical active segment and electrical conductive segment together. Their enhanced visible light absorption originates from tetrahedrally or trigonal-bipyramidally coordinated In atoms in Zn(In)O4(5) layers which enable p–d hybridization between In 4d and O 2p orbitals so that valence band minimum (VBM) is uplifted with a reduced band gap. Theoretical calculations reveal their anisotropic features in charge transport and functionality of different constituent segments, i.e., Zn(In)O4(5) layers and InO6 layers as being for charge generation and charge collection, respectively. Efficient photocatalytic hydrogen evolution was observed in these compounds under full range (λ ≥ 250 nm) and visible light irradiation (λ ≥ 420 nm). High apparent quantum efficiency ∼2.79% was achieved for Zn4In2O7 under full range irradiation, which is almost 5-fold higher than their parent oxides ZnO and In2O3. Such superior photocatalytic activities of these homologous compounds can be understood as layer-by-layer packing of charge generation/collection functional groups that ensures efficient photocatalytic reactions.
研究领域:
材料化学
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光催化
·
半导体物理
·
能源材料
·
无机化学
·
表面科学
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 47
·20561-20571
·
IF 7.139
Tianyu Ai,Jing Li,Shuai Nie,Yansheng Yin,Jinlin Lu,Shuo Bao,Ling Yan
Transition elements doping metal oxide is of great significance for developing gas sensors with high performance. To achieve this goal, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons are successfully synthesized by a facile N, N-dimethylformamide assisted hydrothermal method and characterized by several physical techniques. The morphology of α-Fe 2 O 3 is evolved by introducing Mn elements. The performance of the α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons as H 2 gas sensors are studied and compared. The Mn/α-Fe 2 O 3 -5 polyhedrons sensor exhibit the best performance at optimum operating temperature of 300 °C. The response and recovery times are 10 s/24 s for H 2 with a concentration of 200 ppm, which is much faster in contrast to those recently reported H 2 gas sensors. Furthermore, α-Fe 2 O 3 rod and Mn-doped α-Fe 2 O 3 polyhedrons show abnormal n-p transition sensing behavior with the change of operating temperature. This work provides a facile method for synthesizing α-Fe 2 O 3 based sensing materials for various sensors applications.
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RSC Advances
·
2015
·Vol. 5
·期 26
·19859-19864
·
IF 3.84
Junjun Li,Lin Zhang,Jin Gu,Yuping Sun,Xiaosheng Ji
To retain the hydroxyl group of poly(vinyl alcohol) (PVA), ammonium persulfate (APS) was used to initiate the polymerization of hydrogen on the PVA chain. Rather than hydroxyl-based cross-linking, the generated PVA macromolecule radicals were cross-linked with N,N′-methylene bisacrylamide (MBA) to prepare PVA membranes. The PVA membranes were shown to be successfully cross-linked via FT-IR characterization, as well as measurements of swelling degree and gel fraction. With increasing the content of cross-linker, the swelling degree of the membranes decreased, and the gel fraction increased. The pervaporation performance of the membrane was investigated by separating 95 wt% ethanol aqueous solutions. The cross-linked PVA membrane containing 0.5 wt% cross-linker yielded a high permeate water content (99 wt%) and a total flux of 353 g m−2 h−1 at 40 °C. As the feed temperature increased, the total flux increased, while the permeate water content decreased. The cross-linked membrane exhibited good durability over long-term operation.
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SOLVENT EXTRACTION AND ION EXCHANGE
·
2020
·
IF 1.988
Sherif M. Ibrahim,Yan Zhang,Yun Xue,Suliang Yang,Fuqiu Ma,Guoxin Tian
The extraction of Nd(III), Gd(III), and Er(III), which represent light, middle, and heavy lanthanides, respectively, from chloride solutions has been carried out by using N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA, HA) diluted in kerosene as the organic phase. The results from the slope analysis method indicate that the extraction of Ln(III) with HDEHDGA is mainly governed by the cation-exchange reaction mechanisms in the low pH region (pH 1.2–2.7). The obtained data reveal that the extracted species in the organic phase might be LnA3∙HA(1~2), which consist of a core of 1:3 LnA3 complex and one additional neutral HA molecule for light Ln(III) or two for heavy Ln(III) associated with the core in the outer coordination sphere. The dependency on the temperatures indicates that the extraction of Ln(III) with HDEHDGA is exothermic and is mainly driven by the exothermic enthalpies crossing the whole Ln(III) series. The extraction of the whole Ln(III) series (except for Pm(III)) and Th(IV) has also been evaluated. HDEHDGA provides remarkable extraction capability with considerable separation factors (SF) for adjacent light Ln(III) pairs (SFCe/La = 6.8, SFPr/Ce = 3.3, SFNd/Pr = 2.5, and SFSm/Nd = 3.5), but relatively poor selectivity for the adjacent heavy Ln(III) pairs. It also presents very good selectivity/extractability for Th(IV) over the light Ln(III) ions (SFTh/La = 1362 and SFTh/Ce = 200). These properties make HDEHDGA a promising extractant for separating Th(IV) from light Ln(III) ions and for separating light Ln(III) ions from each other, which coexist significantly in some Rare Earth (RE) minerals, especially monazite and bastnaesite.
研究领域:
湿法冶金
·
稀土元素分离
·
溶剂萃取
·
无机化学
·
核化学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiangtao Meng,Tao Wang,Lei Ren,Jing Wang,Yuanyuan Zhang,Jingkuan Li,Fei Wang
Stage-matched framework reveals fuel-N pathway shifts. • Microwave shifts NH 3 and HCN release to lower temperature regions. • Microwave enriches amines and nitrile precursors in tar at lower temperatures. • Microwave promotes early char deoxygenation and condensation. • Polar O/N activation couples char-N reconstruction with tar-N evolution. Microwave-assisted pyrolysis shows promise for the clean conversion of N-rich biomass, yet its mechanism for regulating nitrogen migration remains unclear. Deashed sewage sludge and protein-derived amino acid models were employed to contrast microwave and conventional pyrolysis. This comparison utilized a reaction-stage-referenced framework based on the characteristic release regions of N-containing gases. Microwave heating did not change the basic nitrogen release pattern, with NH 3 as the dominant product and HCN as the secondary product, but substantially altered the temperature-dependent progression of the fuel-N conversion pathway. Under the present microwave experimental configuration, substantial fuel-N conversion was observed within the measured 190–300 °C range, occurring at lower measured temperatures than under conventional pyrolysis and accompanied by marked changes in O/N-containing structures. Amine intermediates were enriched in tar, and the tar-N fraction increased from about 44% to 87%, driving NH 3 release to lower temperatures. At 300–500 °C, these intermediates further underwent dehydrogenation, cyclization, and nitrilation under microwave effects, forming nitriles and low-carbon mono‑nitrogen compounds and enhancing HCN release around 300 °C. As a result, the characteristic NH 3 and HCN release regions were recorded at lower measured temperatures in the microwave system than in the conventional system. Meanwhile, microwave heating promoted early char deoxygenation and condensation, as reflected by protein-N conversion to pyrrolic-N, pyridinic-N, and nitrile-N, removal of C O and O-C=O groups, reduced interlayer spacing, and enhanced microcrystalline stacking. Tar evolved from heterocyclic and long-chain N-containing compounds toward light aromatics, oxygenated species, and low-carbon nitriles. A three-phase network is proposed wherein tar acts as an intermediate pool connecting char-N reconstruction with NH 3 /HCN release. This study provides mechanistic insights into fuel-N migration during microwave and conventional pyrolysis of N-rich sewage sludge. Download: Download high-res image (180KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Linlin Wang,Yafei Guo,Wenhui Zhao,Pengfei Wang,Zonglin Liu,Ting-Feng Yi
A unique 3D hierarchical network consisting of 0D carbon dodecahedra and 1D carbon nanotubes is successfully constructed via in-situ growth. • Phosphorus doping serves as a versatile modulator to induce 1D morphology formation and optimize the electronic density of iron active centers. • The optimized N, P co-doped Fe-N-C catalyst exhibits an outstanding half-wave potential of 0.884 V in alkaline media. • The assembled zinc-air battery achieves a remarkable operational lifespan exceeding 1300 h with superior structural integrity. Developing highly efficient and durable non-precious metal electrocatalysts for oxygen reduction reaction (ORR) remains a critical challenge for the practical application of zinc-air batteries (ZABs). Herein, we successfully synthesized a robust N, P-codoped Fe-N-C catalyst featuring a unique 0D/1D intertwined architecture through a phosphorus-induced heteroatom-modulation strategy. By utilizing FePc-encapsulated ZIF-8 as a precursor, the in-situ growth of 1D carbon nanotubes from 0D carbon dodecahedrons was achieved, constructing a 3D hierarchical conductive network. Experimental and mechanistic analyses reveal that P-doping serves as the key morphology director. It not only induces the formation of structural-stable 1D nanotubes to enhance electron transfer but also modulates the electronic density of Fe centers to elevate electro-oxidation resistance. Consequently, the optimized catalyst exhibits a superior half-wave potential (E 1/2 ) of 0.884 V (vs. RHE) in alkaline media. Remarkably, the as-assembled ZAB achieves an exceptional stability of over 1300 h, demonstrating the superior structural integrity and durability of the 0D/1D network. This research offers a strategic design for engineering high-performance and stable Fe-N-C catalysts through synergistic 0D/1D architecture construction. Phosphorus-induced modulation facilitates the in-situ growth of 1D nanotubes from 0D dodecahedrons, constructing an integrated 0D/1D hierarchical Fe-N-C structure. This structural engineering optimizes the electronic environment of Fe sites for enhanced ORR kinetics (E 1/2 = 0.884 V) and endows practical zinc-air batteries with an outstanding stability exceeding 1300 h. Download: Download high-res image (283KB) Download: Download full-size image
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Junqing Ye,Gen Li,Fengzhang Ye,Wei Xie,Qun Chen
In this study, a non-noble bimetallic-supported metal oxide catalyst, CuxFe1/ZrO2 rich in oxygen vacancies, was synthesized via dry ball milling for the direct synthesis of N,N′-diphenylurea (DPU) from CO2 and aniline. The optimal Cu5Fe1/ZrO2 catalyst achieved 12.7% aniline conversion with near-100% DPU selectivity (99.9%). Comprehensive characterizations revealed that abundant oxygen vacancies enhance metal–support interaction and serve as primary sites for CO2 adsorption and activation. Combined temperature-programmed desorption of NH3 and CO2 (CO2/NH3-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies elucidated a synergistic acid–base catalytic mechanism. Lewis basic Cu/Fe sites activate CO2, while Lewis acidic Zr4+ sites adsorb and activate aniline, promoting the formation of the key C6H5NH–(CO) intermediate. The catalyst maintained high performance over five cycles, demonstrating excellent stability. This work offers an effective strategy for designing robust non-noble catalysts for CO2 valorization into value-added chemicals.
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RSC Advances
·
2026
·Vol. 16
·期 21
·19213-19224
·
IF 6.1
Jingdong Nong,Zhonghua Sun,Weiyou Zhou,Zhong Wu,Junfeng Qian,Qun Chen,Mingyang He
A series of Cu-modified Ni–Al2O3 catalysts with various Cu/Ni ratios (xCu/Ni–Al2O3) were prepared, and systematically characterized using BET, XRD, SEM, H2-TPR, H2-TPD, TG, and XPS. The catalyst exhibited excellent catalytic performance in the selective hydrogenation of N,N-dimethylaniline to N,N-dimethylcyclohexylamine in a continuous fixed-bed reactor. When the Cu/Ni molar ratio was 0.1, the active components were highly dispersed on the Al2O3 support, which possessed a high specific surface area and well-developed porous structure. Furthermore, the catalyst demonstrated strong hydrogen desorption capacity and enhanced thermal stability. Synergistic electronic interactions between Ni and Cu improved the adsorption and activation of both reactant and H2 molecules. The incorporation of Cu near the Ni active sites effectively modulated the selectivity toward the desired product N,N-dimethylcyclohexylamine. Under the optimal reaction conditions: H2 pressure of 5 MPa, reaction temperature of 130 °C, liquid hourly space velocity 0.1 h−1 and hydrogen-amine volume ratio of 5500 : 1, the 0.1Cu/Ni–Al2O3 catalyst achieved superior performance, with a N,N-dimethylaniline conversion rate of 99.5% and a selectivity for N,N-dimethylcyclohexylamine of 97.6%.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shuai Wang,Yuqi Chen,Shuyan Zheng,Yanan Yuan,Kexin Du,Min Cui,Yue Wu,Ping Li,Wei Hu,Jingui Wang,Yingshu Guo,Zexing Wu,Yanli Zhao
The incorporation of sp-hybridized nitrogen arisen from graphdiyne (GDY) into the catalyst structure significantly improves the electrocatalytic efficiency of zinc–air batteries by modulating the electronic properties of the active sites, thereby accelerating reaction kinetics and enhancing conductivity. This work highlights the efficacy of the Co–N-GDY catalyst, where sp-N moieties in GDY serving as anchoring centers for cobalt species, which demonstrates exceptional performance in the oxygen reduction reaction, achieving a half-wave potential of 0.85 V, along with high oxygen evolution reaction performance that surpasses that of commercial Pt/C + IrO2-based batteries. The Co–N-GDY catalyst also exhibits commendable cycling stability with minimal fluctuation in voltage difference, indicating its suitability for practical applications in advanced energy storage systems. These findings underscore the importance of developing cost-effective and durable M–N–C catalysts to enhance the commercial viability and sustainability of zinc–air battery technology.
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高影响因子
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