SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Penghui Yang,Junyu Chen,Cong Luo,Jiayao Wan,Zhen Du,Xiaoshan Li,Fan Wu,Liqi Zhang
Calcium-based adsorbents hold great promise for large-scale CO 2 capture. However, CaO pellets suffer fragmentation when stored in moist air, limiting their application. Numerous studies demonstrate that the presence of water significantly affects the structural integrity of adsorbent pellets. However, most of these studies focus on high-temperature conditions, while limited attention to moist air conditions. This study investigated the effect of different hydration pathways on the structural integrity of CaO pellets and revealed the fragmentation mechanism under moist air. Multiscale characterizations showed that CaO pellets exposed to moist air or liquid water underwent severe fragmentation, primarily caused by liquid-water hydration reactions. FT-IR and TGA results confirmed the presence of residual water in the fragmented pellets, while Rietveld refinement showed a significant drop in crystallinity and rise in microstrain. These changes compromised the structural integrity of pellets. In contrast, the pellets undergoing high-temperature steam hydration retained structural integrity, showing high crystallinity and low microstrain. Based on this, a hydrothermal shell-core strategy was proposed to enhance the anti-fragmentation performance of CaO pellets. A dense Ca(OH) 2 shell formed via high-temperature steam hydration isolated the CaO core from moist air, significantly enhancing structural integrity. Pellets with over 60 % hydration conversion retained 74.07 % structural integrity after 48 h of exposure to moist air (30 °C and 85 % RH), three times higher than unhydrated pellets, while CO 2 capture capacity of the revised pellets surpassed 0.6 g CO 2 /g adsorbent. These findings provide both mechanistic basis and design strategy for the production, transportation, and storage of calcium-based adsorbent pellets in moist environments.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124082
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IF 7.5
Yanjuan Zhang,Yadong Ning,Yu Wang,Zhanhe Zhang,Zhengyan Liu,Zhihui Yu,Jingkui Qu
Continuous Mg 2+ accumulation during hydrochloric acid leaching of nickel laterite ore causes magnesium loss and increases the burden of saline wastewater treatment. In this study, magnesium was recovered from Mg-rich leachate as reactive MgO by precipitation using milk of lime followed by calcination. Simulated MgCl 2 -rich solutions revealed the concentration-dependent precipitation behavior. At low Mg 2+ concentrations, Mg(OH) 2 formed mainly through direct precipitation and produced dense lamellar precursors. At Mg 2+ concentrations of 30 g/L and above, CaMg 2 Cl 6 ·12 H 2 O was detected as a transient chloride-containing double salt during the early precipitation stage, and honeycomb-like porous Mg(OH) 2 precursors were obtained after washing. Calcination of the precursor produced MgO with improved citric acid activity (CAA). The optimized process was validated using purified Mg-rich leachate, achieving a stoichiometry-based Mg precipitation efficiency of 95.47% and producing MgO with approximately 98 wt% purity. The synthesized MgO showed CAA of 22.52 ± 1.19 s, a specific surface area of 60.75 m 2 /g, and Fe removal performance comparable to commercial MgO, supporting its potential internal reuse as a pH adjustment reagent in hydrochloric acid leaching processes.
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RENEWABLE ENERGY
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2026
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IF 9.1
Chao Song,Xianglei Liu,Xinrui Wang,Qingfeng Zhang,Enda Ci,Shushan Lv,Yongliang Li
Direct solar-driven thermochemical energy storage offers a promising pathway to bridge the mismatch between intermittent solar availability and continuous thermal energy demand, owing to its high energy density and long storage duration. However, existing thermochemical energy storage reactors are usually constrained by intermittent operation, limited controllability, and low solar-to-chemical conversion efficiency. Here, we demonstrate continuous and efficient direct solar-driven thermochemical energy storage via a funnel-shaped falling-particle reactor. By dynamically regulating particle residence time, the reactor enables optimized matching between solar energy transport, reaction kinetics, and particle flow, providing a flexible operating window to balance conversion and throughput. Under direct solar irradiation, the reactor achieves a system efficiency of 26.63%–34.20% and a calcium carbonate conversion of 74.4%–95.5%. Numerical analysis further suggests that a 25% reduction in thermal losses, which is a reasonably achievable target through insulation upgrades and optical optimization, could increase the system efficiency to 40.72%. This work opens new routes for the design of direct solar-driven thermochemical energy storage reactors that enable continuous, efficient, and tunable operation, and promotes their scalable applications.
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Journal of Building Engineering
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2026
·
IF 8.1
Zhaoyang Sun,Cuiyi Chen,Bin Xu,Zixuan Yang,Binmeng Chen
Four HPMC samples are synthesized with molecular weight ranging from 35 to 450 kDa. • Long-chain HPMC causes τ s to peak then drop, while τ d rises monotonically. • Longer-chain HPMC enhances flocculation but deteriorates floc structure. • τ s is governed by competing polymer-bridging and steric-hindrance effects. • τ d increases with HPMC dosage and chain length via stronger polymer interactions. Hydroxypropyl methylcellulose (HPMC), one of the most commonly used viscosity-modifying admixtures (VMAs), is extensively employed in fresh cement-based materials. Indeed, the chain length of HPMC greatly influences the rheological behavior of cement pastes. Here, four HPMC samples with distinct molecular weights ( M w ) from 35 to 450 kDa were chemically synthesized to systematically elucidate how chain length governs the rheology of cement pastes and to reveal the underlying mechanisms. Results show that HPMC with shorter chains (H1, H2, and H3 with M w < 220 kDa) induces a monotonic increase in both τ s and τ d with increasing dosage. In contrast, long-chain HPMC (H4 with M w = 450 kDa) causes τ s to rise from 29 to 114 Pa and then decrease beyond 0.3%, reaching 59 Pa at 0.5%, while τ d continues to increase from 45 to 148 Pa. This divergence in τ s suggests a dual role of adsorbed HPMC: longer chains (H4) may simultaneously intensify interparticle attraction through polymer bridging and enlarge particle separation via steric hindrance, the latter eventually overriding the former at higher dosages. The continuous increase in τ d is attributed to the strengthened polymer-polymer interactions with increasing chain length and concentration, promoting the formation of a more rigid polymer network in the interstitial solution that resists applied shear stress. Overall, this work establishes a systematic mechanistic framework describing how HPMC chain length modulates the rheology of cement paste.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124480
·
IF 7.5
Lucheng Li,Ziwenqi Yang,Zehua Zhu,Yuan Han
Excessive phosphorus input drives eutrophication, threatening aquatic ecosystems and water security. However, efficient phosphorus removal and facile adsorbent recovery remain key challenges in wastewater treatment. To remove phosphorus from water while efficiently recovering adsorbents, this study proposes an innovative chitosan-based adsorption dynamic membrane (ADM) system, aiming to achieve simultaneous phosphorus removal and adsorbent recovery, thereby integrating environmental protection with resource recovery. In this study, system performance was enhanced through the optimization of key operational parameters. The results showed that a higher Ca-PAC-CTS concentration increased filtration resistance, accelerated dynamic membrane formation, and improved adsorbent recovery efficiency. Increasing the flow rate facilitated the rapid development of transmembrane pressure and reduced effluent turbidity, thereby contributing to more effective pollutant removal. The optimal operating conditions were determined as a flow rate of 4.8 L/h, a Ca-PAC-CTS concentration of 1.0 g/L, and a hydraulic retention time of 5 min, under which phosphorus removal and adsorbent recovery efficiencies both exceeded 80%. Overall, this study highlights the potential of ADM systems for efficient phosphorus capture and adsorbent recovery, providing support for the development of sustainable and low-carbon technologies in wastewater treatment.
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PROGRESS IN ORGANIC COATINGS
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2026
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IF 7.9
Xin Yu,Qinghe Gao,Guoxuan Li,Zhigang Lei,Chao Wang,Li Zhang,Huijuan Qian,Mingliang Zhu,Jin Huang,Conying Lu,Zhichao Zhang
Microbiologically influenced corrosion (MIC) induced by sulfate-reducing bacteria (SRB) severely threatens the service of metal materials, and traditional purely passive barrier coatings fail to withstand the continuous attack of biofilms. Herein, a ternary composite material (LDH-ZIF@CaO₂) composed of CoAl-LDH, ZIF-67, and CaO 2 was synthesized and incorporated into epoxy resin to construct an anti-corrosion coating that integrates active antibacterial and anti-corrosion properties. The study reveals that this composite possesses typical microenvironment responsiveness: in the acidic environment generated by microorganism metabolism, the Co ions released from the system can catalyze H₂O₂ (produced by CaO₂ hydrolysis) to undergo a Fenton-like reaction, generating highly oxidizing hydroxyl radicals (•OH) and singlet oxygen ( 1 O₂). This achieves highly efficient eradication of SRB and biofilm detachment. Electrochemical impedance spectroscopy (EIS) tests indicate that when the CaO₂ loading is 200 mg, the coating exhibits the optimal anti-corrosion performance, maintaining high compactness and high impedance characteristics even after 30 d of immersion, the impedance value is 10 8 Ω cm 2 , which is 2 orders of magnitude higher than that of epoxy resin systems. Furthermore, this paper thoroughly elucidates that the excessive addition of CaO₂ (400 mg) leads to filler agglomeration, internal gas pressure, and oxidative degradation of the resin matrix caused by excessive free radicals, which conversely accelerates coating failure. This study provides a new theoretical basis and strategy for designing microenvironment-responsive, anti-MIC coatings.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Nan Xiao,Qi Jiao,Jieqing Shen,Hengti Wang,Xin Yang,Lian Wang,Yongjin Li
For carbon fiber-reinforced polymer composites (CFRPCs), the final properties strongly rely on the interfacial adhesion which is related not only to the fiber surface roughness but also to interaction between the components. Therefore, simultaneously improving fiber surface roughness and optimizing its reactivity via convenient method is of great value for high performance CFRPCs. Herein, by arraying NPA (calcium carbonate as the core while calcium norbornene dicarboxylate as the shell) nanoparticles on acidized carbon fiber felt (HCFF) surface, the hybrid carbon fiber felt (HCFF@NPA) with both rough surface and high reactivity was synthesized, and its strengthening effect for polydicyclopentadiene (PDCPD) was investigated. The results indicated that HCFF@NPA could form a robust interface with PDCPD matrix, which was ascribed to the rough hybrid fiber surface and copolymerization of norbornene units on NPA with DCPD monomers. The obtained PDCPD/HCFF@NPA composites exhibited significantly enhanced interlaminar shear strength and flexural strength of 24.1 ± 0.3 MPa, 243.4 ± 4.0 MPa as compared with those of 10.8 ± 0.2 MPa, 145.2 ± 14.7 MPa for the pristine PDCPD/CFF sample. This work paves a novel pathway for designing hydride fibers with nanoparticles and high-performance fiber-reinforced polymer composites.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Jia Wang,Yi-Fan Qiao,Lei He,Wen-Cui Li,Danhui Sun,Zihao Wang,Xiang Zeng,An-Hui Lu
The conversion of biomass-derived ethanol into C 6–12 alcohols offers a sustainable route for producing fine chemicals such as plasticizers and surfactants, but is hindered by challenges in enhancing and matching complex reaction rates that involve dehydrogenation/hydrogenation and C-C coupling. Herein, we design a hydroxyapatite-supported multifunctional catalyst system (Cu/HAP+Y/HAP) that efficiently converts ethanol into C 6–12 alcohols, achieving selectivity of 71.8% and yield of 38.1% at 250 ℃, which is superior to that of reported catalysts in the literature. The introduction of Y 3 + increased the C-C coupling rate to 26.9 mmol·g Cat. −1 ·h −1 on HAP, matching the Cu 0 enhanced hydrogenation/dehydrogenation rates of HAP. Specifically, by combining physical structure and chemical state analysis, we reveal that the active hydrogen generated at Cu 0 sites migrates to HAP and Y 3+ sites, thereby promoting surface-mediated hydrogenation of the C C bond in butenal to butanal. The resulting butanal is subsequently generated into long-chain aldehydes by self-coupling or cross-coupling at the Y 3+ site and the HAP basic site, and finally hydrogenated to form C 6–12 alcohols. This study develops an efficient strategy for the targeted conversion and valorization of ethanol by precisely matching the rates of dehydrogenation/hydrogenation, coupling through catalytic system engineering, providing a valuable reference for catalyst design in high-value chemical conversion.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Qi Wan,Na Li,Hao Zhang,Yingwei Li,Junrong Yu,Yan Wang,Zuming Hu
Aramid paper, as a high-performance specialty paper, has attracted significant attention in the fields of national defense, military industries, and aerospace. However, its insufficient interfacial bonding strength and limited heat resistance substantially restrict its broader application. Herein, a series of modified poly(m-phenylene isophthalamide) (SPMIA) polymers were synthesized by introducing sulfonic acid groups (-SO₃H) into the molecular chains. The modified polymer was subsequently processed into precipitated fibers, which were then blended with chopped fibers and fabricated into paper via wet-forming and hot-pressing. During the wet‑forming and hot‑pressing of precipitated fibers and chopped fibers, the abundant sulfonic acid and amide groups form a stronger and denser hydrogen‑bond network. The resulting original paper exhibited a tensile strength of 72 MPa, a breakdown strength of approximately 101 kV/mm, and significantly enhanced thermal stability, with a char residue of about 32 % at 700°C. More significantly, the structural design of the precipitated fiber polymer structure enables the resulting paper to undergo multiple cycles of dissolution, fiber recovery, and paper re-preparation.Importantly, the prepared aramid paper achieved three efficient dissolution-regeneration cycles, with no significant decline in the tensile strength or breakdown strength of the regenerated paper, and the intrinsic viscosity of the solution for redissolving paper remained stable, demonstrating excellent potential for SPMIA paper recycling and reuse. This study provides a novel strategy and methodological foundation for developing green and sustainable high-performance aramid paper materials.
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Advanced Composites and Hybrid Materials
·
2026
·Vol. 9
·期 1
·72
·
IF 21.8
Wang Aoxuan,Fang Yuan,Wang Xianfeng,Zheng Dapeng,Yang Haibin,Cao Xiangpeng,Zhang Zuhua,Xing Feng
With the increasing use of aluminum-rich (Al-rich) supplementary cementitious materials (SCMs), clarifying the roles of aluminum in C-A-S-H gels and in surplus Al-rich phases is critical for assessing chloride resistance. An Al-rich C-A-S-H material was synthesized under precise stoichiometric conditions and exposed to accelerated chloride ingress for up to 120 days. The evolution of phase assemblage, gel chemistry and physicochemical properties was monitored during the exposure. A time-dependent model was developed to describe chloride ingress and binding. Chloride ion binding in the Al-rich C-A-S-H occurred through both chemical solidification in Friedel’s salt and physical adsorption, with physical adsorption on C-A-S-H surfaces being dominant, accounting for approximately 60–70% of total bound chloride. The Al-rich phase primarily acted as a “reservoir,” releasing Ca 2+ and Al 3+ which facilitated the formation of Friedel’s salt and promoted the subsequent formation of C-A-S-H gel. Furthermore, the subsequent re-incorporation of aluminum into the C-A-S-H gel under chloride leading to a partial transformation from cross-linked to non-cross-linked silicate chains. This structural evolution is accompanied by a marked micromechanical degradation, with the Young’s modulus decreasing from 11.1 to 6.9 GPa under highly accelerated, severe exposure conditions. Overall, these results provide a time-resolved mechanistic picture of how C-A-S-H gel and surplus Al phases co-evolve under chloride attack, offering a new basis for the durability design of SCM-rich cementitious composites.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·Vol. 61
·期 22
·15926-15939
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IF 4.4
Feng Yu,Sun Jun,Xu Ruonan,Zhang Wenchao,Liu Baicen,Yue Dong,Yao Yuanhang
The advancement of dielectric capacitors toward achieving high-energy storage density requires polymer-based dielectric materials with both high breakdown strength ( E b ) and high dielectric constant ( ε r ). However, the inherent trade-off between E b and ε r limits further enhancement of energy storage density. In this study, a design approach involving inorganic fillers with gradient dielectric matching is proposed for a double core–shell structure. Barium calcium zirconate titanate (BZCT) nanofibers are utilized as fillers within a double core–shell structure (BT + SiO 2 ), embedded into a polyetherimide (PEI) matrix through electrostatic spinning with an oriented arrangement. This results in the fabrication of BZCT nanofibers PEI-based composite dielectrics with parallel double core–shell structure, demonstrating exceptional energy storage performance. Specifically, the composite dielectric (0.5%-10% BZCT@BT@S/PEI) achieves a charge/discharge efficiency ( η ) of 93.29% and a discharge energy density ( U e ) of 6.97 J/cm 3 with BT and BZCT contents of 0.5% and 10%, respectively. The results show that BZCT enhances the ε r of the composite dielectric, while the double core–shell structure of BT + SiO₂ leads to a gradient change in ε r . This strategy not only can reduce the electric field( E ) distortion caused by the dielectric mismatch between the PEI matrix and BZCT, but also the double core–shell structure shows a relatively significant synergistic effect, successfully increasing the E b of the composite dielectric, with simulation results supporting the design rationale behind the double core–shell structure. This investigation introduces an insight for designing energy storage composite dielectrics. Graphical abstract The alternative text for this image may have been generated using AI.
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Polymers
·
2026
·Vol. 18
·期 7
·863
·
IF 5.8
Fangzhou Yin,Kai Ma,Xingyu Gan,Laibo Li,Haiming Zhang,Lingchao Lu
Polymer cement-based coatings (PCC) have great potential in protecting underground structures, while their flame -retardancy is limited by the flammability of the polymer components. Developing multifunctional inorganic fillers that can enhance both mechanical properties and flame retardancy is crucial for improving the safety and durability of the coatings. In this study, an ettringite (AFt) modified by amphiphilic group and aluminum hydroxide (AH) was subjected to surface functionalization treatment and then incorporated into the PCC to enhance the overall performance of the material. The tensile strength and bond strength of the coatings modified by amphiphilic group with AFt were increased by 27.7% and 22.4%, respectively. Meanwhile, the flame burn time, flameless burn time, and carbonization length were reduced by 89.1%, 80.6%, and 90.2%, respectively, and the limiting oxygen index (LOI) increased by 28.9%. The amphiphilic groups act as molecular bridges that couple the inorganic modified AFt with the organic VAE phase, thereby strengthening the organic–inorganic interface and promoting a more integrated polymer–cement network. Meanwhile, the well-dispersed inorganic phases provide endothermic dehydration and a protective residue during heating, jointly improving the mechanical reliability and fire safety of the PCC.
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高影响因子
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