CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Zhishuai Sun,Xujian Lin,Zijian Hu,Cheng Hu,Tao Ji
PBTCA effectively retards MSPPC hydration at an ultralow dosage of 0.12%. • PBTCA prolongs setting time and improves the fluidity of MSPPC pastes. • PBTCA reduces hydration heat release and delays early hydration reactions. • PBTCA provides effective retardation with less strength loss than borax. • A three-stage hydration regulation mechanism of PBTCA is proposed. Magnesium silicon potassium phosphate cement (MgO-K₂HPO₄-SiO₂, MSPPC) uses dipotassium hydrogen phosphate (DHP) as its phosphorus source and reactive silica fume (SF) as an essential component. Although MSPPC can be prepared without conventional retarders, its setting and fresh-state behavior require regulation to extend working time. To address the high dosage, strength loss, and health and environmental concerns of borax, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was evaluated as a low-dosage organophosphonic retarder. Effects of 0.06%, 0.08%, 0.10%, and 0.12% PBTCA on workability, hydration, mechanical properties, and microstructure were investigated, and a three-stage hydration-regulation pathway was proposed. PBTCA prolonged setting and delayed early hydration in a dosage-dependent manner. At 0.12%, initial setting time increased from 7.0 to 46.2 min, fluidity from 70 to 148 mm, and the hydration-temperature peak shifted from 8.46 to 42.30 min with a 5.43 °C decrease. Compressive-strength loss at 0.12% decreased from 8.58% at 3 d to 6.52% at 56 d, while all PBTCA groups showed higher flexural strength, greatest at 0.06%. Microstructural analyses showed delayed early hydration-product development without new principal crystalline phases; at 56 d, the > 200 nm pore fraction decreased from 37.70% to 30.85% at 0.12% with little change in total porosity. Compared with 2%-4% borax, 0.12% PBTCA provided comparable setting control, higher fluidity, and better strength retention at a substantially lower dosage. Mechanistically, PBTCA modifies the early ionic environment through PBTCA-Mg²⁺ interactions, while its proposed association at MgO-solution interfaces retards further MgO dissolution and MKP formation without terminating hydration.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2026
·
IF 1.7
Wu Hao,Tanaka Mai,Osawa Naoki,Kubota Masahiko,Kim Seong-Yun
In this work, a silica-based adsorbent incorporating two types of extractants was synthesized through vacuum-assisted impregnation. The synergistic adsorption behaviors of the prepared (TEHTDGA + TAMIA-EH)/SiO 2 –P composite toward 14 types of representative metal ions in simulated high-level liquid waste were systematically investigated under different contact durations, nitric acid concentrations, and solution temperatures, revealing the strong affinity of the (TEHTDGA + TAMIA-EH)/SiO 2 –P composite toward Pd(II), Ru(III), Re(VII), Mo(VI), and Zr(IV). Particularly, Pd(II) rapidly adsorbed on the composite, reaching equilibrium within 2h, with a removal efficiency exceeding 95%. Notably, the adsorption performance of the (TEHTDGA + TAMIA-EH)/SiO 2 –P composite toward Pd(II) remained stable across broad ranges of nitric acid concentration (0.1–5M) and temperature (288–323K), indicating its strong acid tolerance and thermal stability. Furthermore, the adsorbed Pd(II) was effectively eluted using 0.01M thiourea ([HNO 3 ] = 1M) in chromatographic experiments.
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LANGMUIR
·
2026
·
IF 4.4
Pengfei Zhang,Hao Zhang,Xin Yan,Hongji Zhang,Xiangchao Zhang,Chunfang Du
It is crucial to achieve the valid treatment and reuse of solid waste coal gangue (CG). This work extracted Al and Fe elements from solid waste coal gangue (CG) for the synthesis of layered double hydroxides (NiAlFe-LDHs), which were then converted to layered oxides (LDOs) via calcination to activate peroxymonosulfate (PMS) for rhodamine B (RhB) degradation. NiAlFe-LDOs/SiO2 was also synthesized utilizing leached CG (SiO2) as an inorganic support through thermal treatment of NiAlFe-LDH/SiO2 under an air atmosphere. Due to the different structures and physicochemical properties, NiAlFe-LDOs and NiAlFe-LDOs/SiO2 displayed different removal performance toward organic pollutants. LDO-400 exhibited an outstanding RhB degradation efficiency of about 96% within 20 min in the PMS activation system, and it also showed excellent cycling stability with about 82% degradation efficiency after the eighth cycle. The toxicity of RhB and its degradation intermediates was simulated via ECOSAR software to evaluate the environmental safety of the degradation process. For practical application, LDO@sodium alginate (SA) gel beads were synthesized and employed in a fixed-bed reactor, which maintained a degradation efficiency exceeding 90% after 96 h of continuous operation. Other than the excellent RhB degradation efficiency of LDO-400, LDO/SiO2-400 showed a more remarkable adsorption efficiency of 95% toward tetracycline hydrochloride (TC, 50 mg·L–1) within 40 min compared with LDO-400 (54%) and SiO2 (7%). This work not only provides an effective strategy for aquatic pollutant removal but also realizes the comprehensive utilization of CG as an inorganic non-metallic raw material.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 5
·302
·
IF 5.4
Song Jinrong,Chen Junyu,Tian Rui,Li Haoyu,Bai Wanqiao,Yang Hua,Sun Xuehua
Metal nanoclusters have emerged as promising fluorescence nanomaterials, yet their practical sensing applications remain constrained by limited stability and suboptimal luminescence efficiency. We report a strategically designed nanocomposite, chitosan/silica-encapsulated gold nanoclusters (Au NCs/CSNPs), which integrates three functional components into the fluorescence sensing platform. Unlike conventional encapsulation strategies that merely serve as protective shells, our chitosan-functionalized silica matrix achieves multiple synergistic functions, where rigid confinement enhances quantum yield and photostability, chitosan-induced improvement analyte accessibility, and the tailored composite microenvironment enables analyte-specific response modulation. Remarkably, Au NCs/CSNPs exhibit opposite fluorescence responses toward two distinct contaminants, with enhancement for 2-nitroaniline (2-NA) and quenching for fluazinam (Flu), enabling selective detection with low limits of detection of 52.2 nM for 2-NA and 45.7 nM for Flu. Mechanistic studies reveal that this dual-response behavior originates from distinct pathways including excited-state rigidification for 2-NA versus static quenching coupled with the inner filter effect for Flu. The sensor demonstrates excellent selectivity and practical applicability in environmental and food matrices. This work establishes a new paradigm for nanocluster-based sensors where the encapsulating matrix is not merely protective but functionally integrated to achieve tunable multi-analyte sensing capabilities. Graphical abstract
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Additive Manufacturing
·
2022
·
IF 11.632
Wencai Dong,Chonggao Bao,Kun Sun,Haiqiang Ma,Shijia Li,Taoxin Liu,Wenqi Lu
Fused silica ceramic (SiO 2 ) was modified by polyamine (PDA), and the FTIR , TG, XPS and SEM analyses demonstrated that PDA was successfully coated on the surface of SiO 2 ceramic. Subsequently, the quartz fiber-reinforced PDA-coated silica ceramic (SiO 2 f / m -SiO 2 ) paste was prepared, and the rheological behaviors and cured depth (C d ) of the pastes and the lateral overcuring error of the green body were investigated. The results showed that the viscosities and C d of SiO 2 f / m -SiO 2 paste significantly decreased and the lateral overcuring error of the green body greatly decreased after modifying by PDA. Based on stereolithography combined with silica sol impregnation, the SiO 2 f / m -SiO 2 composites were fabricated and the influence of impregnation times on mechanical properties of SiO 2 f / m -SiO 2 composites was explored. As a result, the mechanical properties were improved along with the impregnation time increasing, and additionally, the flexural strength was 28.9 MPa and compression strength was 72.3 MPa when impregnating three times.
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Polymers
·
2022
·Vol. 14
·期 11
·2169
·
IF 4.967
Jun Yin
To prepare anti-fouling and self-cleaning membrane material, a physical blending modification combined with surface grafting modification has been carried out; first, poly (2-hydroxyethyl methacrylate) grafted silica nanoparticles (SiO2-g-PHEMA NPs) were synthesized using surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP) and used as a blending modifier to fabricate a polyethersulfone (PES)/SiO2-g-PHEMA organic–inorganic membrane by the phase-inversion method. During the membrane formation process, hydrophobic PES segments coagulated immediately to form a membrane matrix, and the hydrophilic SiO2-g-PHEMA NPs migrated spontaneously to the membrane surface in order to reduce interfacial energy, which enhanced the hydrophilicity and anti-fouling properties of the PES/SiO2-g-PHEMA membrane. Importantly, the membrane surface contained abundant PHEMA segments, which provided active sites for further surface functionalization. Subsequently, the carboxyl-terminated fluorocarbon surfactant (fPEG-COOH) composed of hydrophilic polyethyleneglycol segments and low-surface-energy perfluorinated alkyl segments was synthesized via the esterification of fPEG with succinic anhydride. Lastly, the PES/SiO2-g-PHEMA/fPEG membrane was prepared by grafting fPEG-COOH onto surface of the PES/SiO2-g-PHEMA. Thus, a versatile membrane surface with both fouling-resistant and fouling-release properties was acquired. The PES/SiO2-g-PHEMA/fPEG membrane has a large oil–water flux (239.93 L·m−2·h−1), almost 21 times that of PES blank membrane and 2.8 times of the PES/SiO2-g-PHEMA membrane. Compared with the unmodified PES membrane, the flux recovery ratio increased from 45.75% to 90.52%, while the total flux decline ratio decreased drastically from 82.70% to 13.79%, exhibiting outstanding anti-fouling and self-cleaning properties. Moreover, the grafted fPEG segments on the membrane surface show excellent stability due to the presence of stable chemical bonds. The grafted segments remain at the surface of the membrane even after a long shaking treatment. This suggests that this PES/SiO2-g-PHEMA/fPEG membrane material has potential for application in oil/water separation.Keywords:modified polyethersulfone membrane;oil–water emulsion separation;fouling-resistance;self-cleaning;carboxyl-terminated fluorocarbon surfactant
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Surfaces and Interfaces
·
2022
·
IF 6.137
Yucheng Liu,Zhi Huang,Wei He,Mingyan Chen,Wenwen Tu,Meng Zhu,Dong Gan,Shumeng Liu
ABSTRACT In this work, bimetallic MIL53(Fe-Co) nanorod was modified by SiO 2 -COOH nanoparticles to obtain a novel MOF with low aggregation, and then intercalated into the reduced graphene oxide (RGO) layer crosslinked by polydopamine (PDA) to form a super-hydrophilic membrane with selective adsorption. The composite material was characterized by various analytical techniques. Owing to the low agglomeration of bimetallic MIL53(Fe-Co) and improved layer spacing of RGO , the stable composite membrane exhibited a water contact angle of approximate 0°, with the dye solution flux of 1721.46 L·m −2 ·h −1 ·bar −1 for methylene blue (MB) and 1834.88 L·m −2 ·h −1 ·bar −1 for malachite green (MG), the dye solution flux was increased by 31 and 33 times compared with M0, respectively. Meanwhile, the rejection rates of MB and MG were 99.46% and 99.4% with an excellent tolerance to a wide range of pH. Furthermore, the composite membrane shows a huge adsorption capacity in treating dye solution with high concentration and large volume for reusability due to the improvement of hydrophilicity. It also performed excellently in the field of separating oil/water emulsion with the flux of 539.79 L·m −2 ·h −1 ·bar −1 and rejection of 98.12%. In conclusion, the composite membrane with extraordinary hydrophilicity, strong adsorption capacity, and superior anti-fouling performance with low costs endows possibility of massive manufacture in commercial production for wastewater separation and purifications.
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LUMINESCENCE
·
2021
·Vol. 37
·期 1
·58-71
·
IF 2.464
Zheng Chang,Chao Zhang,Binghua Yao
A novel dual-sensitization electrochemiluminescence (ECL) immunosensor for the detection of tumour protein prostate specific antigen (PSA) at trace level using Ru(bpy) 3 2+ -doped chitosan/SiO 2 nanoparticles (Ru(bpy) 3 2+ /chitosan/SiO 2 NPs) as the first signal enhancers was fabricated. Due to chitosan with excellent pore forming capacity, these nanoparticles possess porous structures and better photopermeability, and therefore have higher luminescence efficiencies compared with Ru(bpy) 3 2+ /SiO 2 NPs reported in previous publications. Conversely, chitosan with good biocompatibility and high hydrophilicity was electrochemically decorated onto a Nafion/multiwall carbon nanotubes (Nafion/MWNTs) modified electrode surface and used as the second sensitizing matrix to seize large amounts of prostate specific capture antibody (Ab 1 ). The chitosan-decorated Nafion/MWNTs composites exhibited a 5.5-times higher ECL intensity than the unadorned Nafion/MWNTs films. Also, without additional reagents, such as (3-aminopropyl)triethoxysilane (APTS), the one-step functionalized Ru(bpy) 3 2+ /chitosan/SiO 2 NPs provided a large number of active arms to connect with PSA-detected antibodies (Ab 2 ) through the amino groups in chitosan. After a sandwich immunoreaction, the PSA antigen and Ru(bpy) 3 2+ /chitosan/SiO 2 NPs-labelled Ab 2 were sequentially captured onto the Ab 1 /chitosan/Nafion/MWNTs-modified electrode surface. The ECL signal increases were linearly related to the PSA antigen concentrations and ranged from 0.01 pg·mLl −1 to 10.0 pg·mLl −1 . Under the optimized experimental conditions, the immunosensor displayed excellent sensitivity and selectivity. The detection limit was as low as 3.4 fg·mLl −1 , equivalent to, or better than, those of the reported ECL immunosensors for PSA.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 32
·期 2
·478-485
·
IF 3.543
Abdallah Rusul Mohammed,Al-Haddad Raad M. S.
Core–shell nanoparticles (CSNPs) have attracted attention in biomedical applications as they have highly useful materials with modified characteristics, such as high stability, dispersibility, higher permeability to certain target cells and reduction in consumption of precious materials. Synthesis of core–multishell nanoparticles with suitable sizes, structural characteristics and absorption using simple methods continues to be a challenge. In this study, \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\) CSNPs were synthesized in three stages to control their size and the potential for tuning their properties. Field emission scanning electron microscope images confirmed that \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\) CSNPs have a small particle size of about 22.5 nm, average crystalline size in X-ray diffractometer analysis was 22.8 nm, stability was about − 49.1 mV, and synthesis with magnetic and optical properties improved their biocompatibility. Treatment of CAL-51 and HBL-100 cell lines by \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\) CSNPs under NIR laser and alternating magnetic field generated enough heat to increase cell death.
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ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Zhihuan Zhao,Pengfei Yang,Xiao Zhang,ShashaYang,Jianying Lin,Jimin Fan,Bing Zhang
MoS 2 /C@SiO 2 spheres were successfully synthesized by a one-step hydrothermal method using silica as the template, sodium molybdate as the Mo source and glucose as the carbon precursor. In this paper, the antitumor ability of MoS 2 /C@SiO 2 and C@SiO 2 nanospheres was evaluated through the photothermal effect induced by near infrared (NIR) spectroscopy and the drug loading and release behaviors of the model drug doxorubicin (DOX). The photothermal conversion efficiency (η) of MoS 2 /C@SiO 2 of 42.5% was 1.2 times that of C@SiO 2 (34.7%), which indicated its significant photothermal effect. The drug loading of MoS 2 /C@SiO 2 of 46.5% was much higher than that of C@SiO 2 (12.4%); it was 3.75 times that of C@SiO 2 . The cumulative drug release of MoS 2 /C@SiO 2 and C@SiO 2 under a simulated acidic tumor environment and NIR irradiation was 58.9% and 27.29%, respectively. Moreover, the cell viability assays verified that MoS 2 /C@SiO 2 -DOX had excellent antitumor ability under the co-stimulation of endogenous (pH) and exogenous (NIR) compared with C@SiO 2 -DOX. The experimental results showed that the survival rate of cancer cells in MoS 2 /C@SiO 2 -DOX under coordinated treatment was only 19.4%, while that of C@SiO 2 -DOX was 24.6%.
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Molecular Catalysis
·
2020
·
IF 3.687
Jia-Qin Wu,Ding-Lin Wang,Xiao-Mei Xu,Neng-Bing Long,Rui-Feng Zhang
Novel nano-composites were prepared by coating epoxy resin-based cationic polymer in nano-thickness via in-situ curing on the wall of macroporous SiO 2 with pore size of 0.5∼1 μm. By changing the thickness of polymer coating the porosity and specific surface area varied in range of 90.4∼83.9 % and 115∼74 m 2 /g, respectively. Through electrostatic adsorption phospholipase A 1 (PLA 1 ) was efficiently immobilized on the nano-composited support, the loading amount of PLA 1 on the nano-composited support reached to a maximum of 138.6 mg/g support , the specific activity of the immobilized PLA 1 reached as high as 21,300 U/g protein . The immobilized PLA 1 was applied for the highly efficient synthesis of DHA/EPA-rich phosphatidylcholine . The incorporation of DHA/EPA reached as high as 74.8 % and the yield of phosphatidylcholine (PC) was 83.1 % within 20 h at 60 °C using PC/ethyl esters mass ratio of 1:6. After 12 cycling reuses the immobilized PLA 1 still retained 57.8 % of the incorporation of DHA/EPA.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiang Hou,Jiangfeng Chu,Cong Liu,Jinnan Wang,Aimin Li,Tong Lin,Corvini Philippe François-Xavier
Photocatalytic denitrification has attracted great attention owing to its high efficiency and environmentally friendly features. However, selectively photocatalytic reduction of high concentration nitrate to N 2 is still a challenging problem due to the competition of photons between nitrate and photocatalysts. Herein, the Ag/SiO 2 core encapsulated in the crystalline TiO 2 shell (Ag/SiO 2 @ c TiO 2 ) was constructed for improvement of photocatalytic denitrification. Finite difference time domain (FDTD) simulation demonstrated that strong light scattering improved light harvesting via optical confinement. Meanwhile, surface plasmon resonance and electron sink effect of Ag not only enhanced the photogenerated electrons density but also promoted charge carriers separation of Ag/SiO 2 @ c TiO 2 . More importantly, e cb − of TiO 2 -shell could be immediately transferred to Ag to keep the balance between Ag 0 and Ag + , which contributed to the good stability of Ag/SiO 2 @ c TiO 2 . 95.8% nitrate ( C 0 = 2000 mg/L) was removed by 5 wt%Ag/SiO 2 @ c TiO 2 with N 2 selectivity of 93.6% within 4 h. Even after five cycles, 5 wt%Ag/SiO 2 @ c TiO 2 still remained high photocatalytic denitrification efficiency (92.2%). Notably, since TiO 2 -shell prevented the reaction between Ag and Cl − , more than 92% nitrate could be removed within 5.3 h in the presence of high concentration Cl − .
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危险品化学品经营许可证（带存储）