JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huixin Zhou,Dingxun Ma,Lingwen Dai,Lage Wuri,Yichao Wang,Xiaozhen Liu,Xinqian Shu
Coal gangue (CG) provides an abundant source of siliceous minerals that can be converted into effective silica. This study aimed to gain a deeper understanding of the evolutionary mechanism of quartz (Qtz) and kaolinite (Kln), in the conversion process of thermal–chemical coupled activation to effective silica. The structure transformation of two types of siliceous minerals and thermodynamic calculation were used to develop a phase diagram model for the formation of effective silica, and then provide a scientific basis for the thermodynamic study of solid-phase reactions. We showed that K 2 CO 3 outperformed CaCO 3 in activation efficiency in the thermal–chemical coupled activation process, and Kln had a higher activation efficiency than Qtz. Notably, when the calcination temperature reaches 850 °C, the activation efficiency of the Kln system with added K 2 CO 3 could exceed 50 %. Characterization and analysis of the effective silica properties and structure revealed that low bioactivity effective silica existed in the minerals with (K, Ca) x Si y O z , corresponding to the Q 3 structure; while high bioactivity effective silica existed in the minerals with (K, Ca) x Al w Si y O z , corresponding to the Q 3 (1Al) structure. Finally, we used FactSage thermodynamic calculation software to further predict the phase transformation process of the solid-phase reaction. The simulation results highly matched the experimental data, providing strong support for effective silica synthesis and process optimization. This study provides theoretical basis for understanding the multi-pathway, multi-phase reaction mechanisms of siliceous minerals transforming into effective silica within CG.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Xiaoqing Wang,Jinyun Xu,Shijie Shang,Ming Li,Sijia He,Xiaoyan Wang,Bingyu Yang,Yirang He,Xiaolu Ru,Yanyan Ji,Wenju Zhu,Chunming Zheng,Xiaohong Sun
Bipolar membranes (BPMs), composed of anion exchange membrane (AEM) and cation exchange membrane (CEM), hold promise for energy and environmental applications due to their ability to dissociate water into H + and OH − under reverse bias. However, their practical voltage requirements often exceed theoretical potentials, necessitating efficiency optimization. This study introduces an innovative BPM design integrating alginate (SA)-based CEM with chitosan AEM, enhanced by polydopamine-coated halloysite nanotubes (DHNTs) loaded with phosphotungstic acid (HPW). The tubular structure of the DHNTs, modified via dopamine polymerization, improved mechanical stability and proton conductivity, while HPW coating (optimized at 10 wt %) facilitated acid-base interactions, reducing proton hopping distances. Comprehensive characterization (SEM, FTIR, XPS, TGA) confirmed successful HPW coating and structural modification. The optimized BPM exhibited enhanced tensile strength than unmodified BPM with proton conductivity of 36.56 mS/cm and low water dissociation overpotential of 1.188 V at 70 mA/cm 2 . Electrodialysis tests revealed reduced interfacial resistance (IR drop) and increased stability over 48 h, attributed to HPW's catalytic role in accelerating ion transport and minimizing energy loss. The synergy between DHNTs and HPW significantly improved hydrophilicity, mechanical robustness, and energy efficiency, demonstrating the potential of this design for sustainable electrochemical systems. These findings provide critical insights into advanced BPM development for scalable energy and environmental technologies.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
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IF 4.7
Liu Yaqing,Cui Yixin,Meng Huibiao,Long Ke,Shao Linjun,Xing Guiying
Palladium plays an important role in modern industry, agriculture and medicine. The direct discharge of palladium results in serious environmental pollution and loses of precious palladium metal. Herein, kaolin/chitosan hybrid nanofibers were successfully prepared to recover Pd 2+ cations from aqueous solution. Chitosan and kaolin mixture was first electrospun into nanofibers with citric acid as the in situ crosslinking agent and poly(ethylene oxide) as the co-spinning polymer. Then, the chitosan molecules in these hybrid nanofibers were in situ crosslinked by critic acid at elevated temperatures to endow these nanofibers with excellent solvent resistance. Their structure characterization was conducted by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and positron annihilation lifetime spectroscopy (PLAS). The adsorption performances of these fibrous adsorbents were carefully investigated and optimized (e.g. kaolin content, temperature, pH of solution and initial Pd 2+ concentration). The adsorption results demonstrated that incorporation of kaolin powders into the nanofibers could enhance the adsorption capacity from 31 mg/g to 64 mg/g. Thermodynamic parameters studies revealed the endothermic and spontaneous natures of the adsorption process of Pd 2+ cations on these hybrid nanofibers. The Pd 2+ adsorption behavior of this fibrous adsorbent fitted well with the second-order kinetic model, suggesting the chemical adsorption behavior of Pd 2+ cations on this fibrous adsorbent. Moreover, this fibrous adsorbent can be easily regenerated and reused at least three times without significant loss of initial adsorption capacities. These results clearly indicate that this fibrous chitosan/kaolin hybrid absorbent holds great potential in the recovery of precious palladium cations from aqueous solution.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
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IF 1.6
Ran Maobiao,Gou Xiaoliang,Wang Pingping,Chen Shunzhang,Shu Xiaoyan,Liu Yi,Zhang Shengdong,Lu Xirui
In this study, the pollucite solidified form was hydrothermally synthesized by metakaolin, non-radioactive CsCl, and NaOH to immobilize CsCl in the radioactive molten salt waste. At 200 °C, the immobilization ratio of Cs increased with the enhancement of reaction system alkalinity by NaOH, but it was also accompanied by the formation of sodalite. Excessive Si was adverse to the crystallization of the solidified form. In addition, the proportion of Cs in the solidified form was constrained by the substitution competition between Cs + and Na + , which was affected by reaction time. The nucleation and growth of pollucite mainly occurs from 2 to 4 h, and the CsCl immobilization ratio could reach 36.27 wt .% at 6 h. The thermal weight loss rate of the solidified form within 1000 °C was less than 4 wt .%, and the normalized leaching rate of Cs was 5.05 × 10 –5 g m −2 d −1 for 14 d, showing reliable thermal stability and chemical durability. Graphical abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
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IF 4.9
Bingrui Yang,Tengfei Fan,Yixuan Mao,Jixi Chen,Botuo Zheng,Yu Sheng,Huagui Zhang
To address the increasing global plastic pollution while the reducing oil supply, the biodegradable and bio-derived poly(lactic acid) (PLA) has been developed and considered to be the most promising substitute of petroleum-based plastics. However, the severe brittleness of PLA has become the obstacle of its broad application. Blending modification with poly(butylene-adipate-co-terephthalate) (PBAT) has been proved to be an potentially feasible strategy to toughen PLA, but conflicted by the poor compatibility between PLA and PBAT. To tackle the problem, a comb-type clay-based Janus nanosheet of poly(methyl methacrylate- kaolinite- poly(butylene-adipate-co-terephthalate) (PMMA-Kaol-PBAT) was prepared by selectively grafting PMMA and PBAT separately on either sides of kaolinite Janus nanosheets (JNS). PBAT was functionalized with quaternary amine via aminolysis before being cation-exchanged onto the siloxane tetrahedral surface (STS) side of kaolinite nanosheets, while PMMA chains were grafted onto the aluminoxyl octahedral surface (AOS) side after a beforehand surface modification with the silane coupling agent KH-570. Introduced in the PLA/PBAT blend system, the PMMA-Kaol-PBAT was found to enrich at the interface, enhancing the phase compatibility with the phase separation and aggregation inhibited during the film coating and annealing process.
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WATER RESEARCH
·
2024
·
IF 11.4
Yunxuan Chen,Jun Nan
Abandoning the costly development of new membrane materials and instead directly remodeling the naturally occurring cake layer constitutes a dynamic, low-cost, long-lasting, and proactive strategy to "fight fouling with fouling". Several optimization strategies, including coagulation/modified magnetic seed loading and applying a weak magnetic force (0.01T) at the ultrafiltration end, improved the anti-fouling, retention, and sieving performances of conventional ultrafiltration process during the treatment of source water having complex natural organic matter (NOMs) and small molecule micropollutants. Two modified magnetic seeds we prepared were composite nano-seed particles (Fe 3 O 4 @SiO 2 -NH 2 (FS) and Fe 3 O 4 @SiO 2 @PAMAM-NH 2 (FSP)). Aim of the study was to regulate the formation of cake layer via comprehensive testing of the antifouling properties of optimized processes and related mechanistic studies. It was found to be essential to enhance the interception of xanthate and tryptophan proteins in the cake layer for improving the anti-fouling performance based on the correlation and redundancy analyses, while the use of modified magnetic seeds and magnetic field showed a significant positive impact on water production. Blockage modeling demonstrated the ability to form a mature cake layer during the initial filtration stage swiftly. This mitigated the risk of irreversible fouling caused by pore blockage during the early stage of coagulation-ultrafiltration. Morphologically, the reconstructed cake layer exhibited elevated surface porosity, an internal cavity channel structure, and enhanced roughness that can promote increased water flux and retention of water impurities. These optimized the maturity of the cake layer in both time and space. Density Functional Theory (DFT), Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, and Modified Extended Derjaguin-Landau-Verwey-Overbeek (MDLVO) calculations indicated aggregation behavior of matter on the cake layer to be enhanced effectively due to magnetic seed loading. This is mainly due to the strengthening of polar interactions, including hydrogen bonding, π-π* conjugation, etc., which can happen between the cake layer loaded with FSP and the organic matter. Under the influence of a magnetic field, magnetic force energy (VMF) significantly impacts the system by eliminating energy barriers. This research will provide innovative strategies for effectively purifying intricate source water through ultrafiltration while controlling membrane fouling.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Qing Sun,Xiaofang Hu,Hang Wang,Hanhu liu,Yuanyuan Lin,Jian Zhang,Xiongbo Dong,Jiawei Sheng
Oxygen vacancies are prevalent in metal compounds and play a significant role in the activation of peroxomonosulfate (PMS) to mitigate water pollution. However, how to easily construct these oxygen vacancies and elucidate the mechanism of PMS activation by oxygen vacancies are still pending research and solution. This study presents the synthesis of a NiCoAl-LDH/Kaolin (NiCoAl-LDH/Kao) hybrid catalyst with quasi-2D layer structures morphology and abundant oxygen vacancies (OVs) for activating peroxymonosulfate (PMS). We proposed an intriguing phase transformation from NiCo-carbonate hydroxide (CH) to NiCoAl-layered double hydroxide (LDH), and elucidated the morphological evolution mechanism from nanorod to nanosheet structures through alkaline etching. The NiCoAl-LDH/Kao-PMS system exhibited excellent rapid kinetics and removal efficiency of norfloxacin (NOR), degrading 92.0 % of NOR within 10 min and achieving a final degradation rate of 97.2 %, along with remarkable reusability performance of the NiCoAl-LDH/Kao catalyst. Furthermore, reactive oxygen species including sulfate radical (SO 4 − ), hydroxyl radical ( OH), superoxide anion (O 2 − ) and singlet oxygen ( 1 O 2 ) were found to be involved in the degradation process of NOR, and the degree of activity of the active groups from strong to weak is 1 O 2 , SO 4 − , O 2 − and OH. The activation mechanism and conceivable degradation pathways of NOR were experimentally studied and proposed, and the toxicity of degradation intermediates was evaluated. The facile preparation method for NiCoAl-LDH/Kao nanocomposite holds potential for large-scale manufacturing in organic pollutant remediation, while also providing new insights on the indispensable role of OVs in heterogeneous catalysis.
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APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Dongyue Wang,Huaming Yang
The increasing prevalence of antimicrobial resistance (AMR), particularly among Gram-negative organisms, has led to a significant challenge in treating infections with antibiotics. Despite the long-term efforts to explore antibacterial agents or drugs, potentiating antibacterial activity while minimizing toxicity to human health remains a significant challenge. In this study, zinc-kaolinite composites were prepared using the calcination method to achieve effective and selective antibacterial activity while maintaining non-toxicity to mammalian cells. The interfacial interactions between kaolinite and zinc ions resulted in the immobilization of the latter by cation-π interaction and polar interactions. This led to a disordered structure and different geometrical configurations at the interface, with the spatial coefficient of the zinc ions changing from 0.64 to 2.08. Furthermore, the interfacial interactions regulate the intrinsic mobility and dissolution rates of zinc ions in solution, resulting in the controlled release of zinc ions. Moreover, a well-oriented structure and steady-flow rheological behaviors enable zinc-kaolinite composites to search for bacteria, thereby achieving selective antibacterial activity. The release behavior of zinc ions at the site of the bacterial surrounding environment significantly reduces toxicity and side effects. The comprehensive investigation of interfacial interaction and antibacterial performance provides new perspectives for the development of metal ion-based antibacterial materials in public health environments.
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Advanced Healthcare Materials
·
2024
·Vol. 13
·期 23
·2400993
·
IF 10
Qiao Yu,Wenjie Wang,Ningyue Deng,Baihai Su,Weifeng Zhao,Changsheng Zhao
Ideal hemostatic materials for the emergency rescue of war and traffic accident sufferers are essential to significantly control hemorrhage, reduce patient discomfort, and improve the survival ratio. However, most hemostats absorb blood quickly in contact with the wound; and then, adhere to blood clots, resulting in breaking scabs and tearing the wound when the materials are removed. Herein, an effective Janus amphipathic hemostatic dressing (Fiber@Gel/Ca 2+ /KL) with a fiber layer (polylactic acid/carboxymethyl chitosan) and a hydrogel layer (polyvinyl alcohol, carboxymethyl chitosan, Ca 2+ , and kaolin) is reported. Such a composite dressing unidirectionally drains the excessive serum from its hydrophobic side (fiber layer) to its hydrophilic side (hydrogel layer), so-called self-pumping, thereby further concentrating coagulated factors (including red blood cells and platelets). Further, Ca 2+ diffused from the hydrogel layer subsequently activates platelets and coagulation cascade. Besides, the Fiber@Gel/Ca 2+ /KL exhibits specific blood-clot anti-adhesion property on the fiber layer, making the dressing easily and safely peel off from the wound. It is believed that this novel hemostatic dressing with good hemostatic performance, easy clots removal, and excellent biocompatibility is expected to be used as a safe and efficient hemostatic dressing in clinical applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Yunxuan Chen,Jun Nan,Mingqi Guo,Yibo Zhang,Jinghui Wang,Qi Wang,Rui Fang
Finding alternative solutions of water source containing short-term relative high turbidity and large organic content is a pressing need in view of the inherent limitations of traditional inorganic coagulants. Requirement of significant dosage increase for conventional iron and aluminum salt coagulants can create several challenges including dose adjustment, suboptimal performance and high concentration of residual metal ions. In this study, acrylamide monomer (AM) and methacryloyloxyethyltrimethylammonium chloride (DMC) were grafted onto starch and carboxymethyl starch to obtain novel cationic and amphoteric starch-modified coagulants. Concurrently, the obtained coagulants were comprehensively evaluated under varying simulated water quality conditions to analyze their turbidity and organic matter removal efficiencies. Polymerized aluminium chloride (PACl) was used as the reference coagulant to evaluate the roles of polymer charge density, total charge, and molecular chain length in the coagulation mechanism for further illustration of their efficacy. In comparison to the traditional coagulant PACl, the modified coagulant was found to be more effective in enhancing flocculation and aggregation behavior, lowering of energy barriers, and enhancing adsorption energy by using the Density Functional Theory (DFT) calculations and Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory based investigation of the mechanism. Moreover, these behaviors were mainly attributed to significant exchange of charge density between coagulant and the pollutants. Additionally, in order to facilitate accurate and efficient treatment of water having diverse qualities, quadratic polynomial equation based mathematical model was constructed for quantitative analysis and model prediction. Findings of this study point towards an effective and precise approach to coagulation technology and thereby enabling sustainable and efficient purification of turbid source water containing large organic matter.
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ACS Nano
·
2024
·
IF 15.8
Guoqiang Zhao,Xiaoyu Tao,Tongsen Guo,Liangjie Fu,Huaming Yang
Solution-phase epitaxy is a versatile method to synthesize functional nanomaterials with customized properties, where supports play a central role as they not only serve as nucleation templates but also greatly affect the local electronic structures. However, developing functional supports remains a great challenge. Herein, inspired by the commonly observed epitaxy of minerals in the natural environment, we report using calcination-modified kaolinite as the support for the epitaxial growth of hexagonal CoO nanoparticles (h-CoO NPs), which enables over 40 times higher mass-specific activity toward H2O2 electrochemical activation than the counterpart without the support. High-resolution electron microscopy, magic-angle spinning nuclear magnetic resonance, and X-ray absorption fine structure results prove that the Al sites in kaolinite play a crucial role in the formation of h-CoO NPs. Moreover, the five-coordinate Al (AlV) sites produced by the dehydration of kaolinite are indispensable for forming the epitaxial interface. Theoretical calculations reveal that the local electron densities around AlV sites are lower than those of general six-coordinate Al sites, which render AlV sites with strong adsorption capability that facilitates the nucleation of h-CoO NPs. Also, the AlV sites induce the electron transfer from h-CoO to the kaolinite support that results in the upshift of the Co 3d band center and hence improve the H2O2 activation kinetics. Our results demonstrate the superiority of nanoclay as functional supports and could offer a more benign strategy to the solution-phase epitaxy production of functional nanomaterials for diverse applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
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IF 4.9
Guangjian Tian,Wenjun Wang,Zhou Wang,Haidong Wang,Chuyu Zhu,Yi Zhang
Silicates with the antibacterial hemostatic effects used in wound healing that could be served as antibiotic alternatives to traditional biomedicines. Mixed silicates containing two or more silicates with different morphologies exhibit an accelerated antibacterial hemostatic effects (e.g., the antibacterial rate toward kaolinite-montmorillonite against E. coli and S. aureus reached a maximum value of 59.14 ± 1.46 % and 91.83 ± 0.85 %, the blood clotting index and the hemostatic time toward kaolinite-montmorillonite reached a maximum value of 4.06 ± 1.56 % and 165.67 ± 6.13 s), that could be attributed to the individual silicate’s intrinsic antibacterial hemostatic effects arising from the silicate’s surface/edge charge and the constructed three-dimensional micro-architectural characteristics arising from the individual silicate’s loose stack state in mixed silicates. Besides, those ineffective antibacterial hemostatic effects were attributed to the unsuccessful three-dimensional micro-architectural construction originated from the silicate’s unreasonable mass ratio. The current findings illustrated that mixed silicates with an accelerated antibacterial hemostatic effects could be used in wound healing with taking into account biomedical functional module collocation and actual scenario orientation.
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