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A brief review of preparation and applications of monolithic aerogels in atmospheric environmental purification

Journal of Environmental Sciences 2025年第3期149卷 209-220页

作者： Linfeng Nie Shuangde Li Mengjie Cao Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Science&Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Monolithic aerogels are promising candidates for use in atmospheric environmental purification due to their structural advantages,such as fine building block size together with high specific surface area,abundant pore structure,***,monolithic aerogels possess a unique monolithic macrostructure that sets them apart from aerogel powders and nanoparticles in practical environmental clean-up *** review delves into the available synthesis strategies and atmospheric environmental applications of monolithic aerogels,covering types of monolithic aerogels including SiO_(2),graphene,metal oxides and their combinations,along with their preparation *** particular,recent developments for VOC adsorption,CO_(2)capture,catalytic oxidation of VOCs and catalytic reduction of CO_(2)are ***,challenges and future opportunities for monolithic aerogels in the atmospheric environmental purification field are *** reviewprovides valuable insights for designing and utilizing monolithic aerogel-based functional materials.

关键词： Monolithic aerogel Environmental purification Catalysis Adsorption

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Insight into leaching rare earth from ion-adsorption type rare earth ores with citric acid:Performance,kinetic analysis and differentiation leaching

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Journal of Rare Earths 2025年第3期43卷 591-602,I0007页

作者： Mengfei Zhao Zedong Teng Xingyu Ma Xiaoliang Jiang Hualin Zhang Youming Yang Tinggang Li Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Key Laboratory of Rare Earths Jiangxi Institute of Rare EarthsGanjiang Innovation AcademyChinese Academy of SciencesGanzhou341119China CAS Key Laboratory of Green Process and Engineering Innovation Academy for Green ManufactureNational Engineering Research Center of Green Recycling for Strategic Metal ResourcesBeijing Engineering Research Centre of Process Pollution ControlInstitute of Process EngineeringChinese Academy ofSciencesBeijing100190China State Key Laboratory of Biochemical Engineering Key Laboratory of Biopharmaceutical Preparation and DeliveryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental ***,demand for bioleaching is on the rise with the advantage of being *** one of the organic acids produced by biological metabolism,citric acid was used to leach REEs and explore the performance and *** results demonstrate that citric acid exhibits higher leaching efficiency(96.00%)for REEs at a relatively low concentration of 0.01 mol/L compared with(NH_(4))_(2)SO_(4)(84.29%,0.1 mol/L)and MgSO_(4)(83.99%,0.1 mol/L).Citric acid shows a preference for leaching heavy rare earth elements,with 99%leaching efficiency in IAREO,which shows higher capacity than(NH_(4))_(2)SO_(4)and MgSO_(4)(as inorganic leaching agents).Kinetic analysis indicates that the leaching process of REEs with citric acid is controlled by both the internal diffusion kinetics and chemical reaction kinetics,which is different from inorganic leaching *** Minteq calculations confirm that RE-Citrate is the main constituent of the extract solution in the leaching process of the IAREO,thereby enhancing the leaching efficiency of REEs from the *** suggests that citric acid may be used as a promising organic leaching agent for the environmentalfriendly extraction of REEs from IAREO.

关键词： Ion-adsorption type rare earth ores Rare earths Citric acid Complexation Organic acid Differential leaching

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Preparation of Biobased Porous Hydrogels by Citric Acid Grafted Polyacrylic Acid for Rare Earth Elements Separation

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2025年第2期57卷 29-45页

作者： He, Bo Xiang, Wenchao Li, Wenjing He, Ming Yang, Liangrong Yang, Chao Yang, Guihua State Key Laboratory of Green Papermaking and Resource Recycling Qilu University of Technology China State Key Laboratory of Petroleum Molecular & Process Engineering CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences China School of Chemical Engineering University of Chinese Academy of Science China State Key Laboratory of Petroleum Molecular & Process Engineering CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences China School of Chemical & Environmental Engineering China University of Mining & Technology China State Key Laboratory of Green Papermaking and Resource Recycling Qilu University of Technology China State Key Laboratory of Petroleum Molecular & Process Engineering CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences China School of Chemical Engineering University of Chinese Academy of Science China State Key Laboratory of Green Papermaking and Resource Recycling Qilu University of Technology China

Rare earth elements (REEs) are essential for advanced technologies such as energy, electronics, and aerospace. Efficient separation of REEs is critical for the full utilization of natural limited resources. To obtain biobased absorbents with large adsorption capacity, high selectivity, and good reusability, a larger surface area and functionalized surface of absorbents are required. In this work, the porous PAA-CA (citric acid-grafted polyacrylic acid) hydrogels were prepared using a high internal phase emulsion templating method. The physical and chemical properties of PAA-CA were characterized by FTIR, XPS, and SEM. The influence of pH, temperature, initial concentration, and contact time on the adsorption capacity of Pr3+ (light REE) and Er3+ (heavy REE) was investigated and analyzed. The results show that PAA-CA hydrogels exhibited good adsorption performance with a better adsorption capacity for Er3+ of around 400 mg/g. The adsorption process was pH-dependent, with optimal adsorption at pH = 3–7. Kinetic studies revealed that the adsorption followed a pseudo-second-order model, while thermodynamic analyses confirmed the process was spontaneous and endothermic. PAA-CA exhibited good selectivity for Er3+ in a binary ion system, especially containing K+ or Fe3+. Furthermore, the hydrogels retained high adsorption capacities across 10 adsorption-desorption cycles, highlighting their excellent reusability. These results suggest that porous PAA-CA hydrogels are promising materials for the selective recovery of REEs from aqueous solutions. © 2025 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Grafting (chemical)

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Activating lithium storage in 2D CaSi_(2) anode via enhancing pseudocapacitive properties with oxygen modification engineering

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Nano Research 2025年第4期18卷 199-206页

作者： Yongzheng Zhang Lu Sun Kailin Yang Youwang Ye Liang Zhan Qi Wei Jianan Gu Institute of Energy Power Innovation North China Electric Power UniversityBeijing 100096China State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology InstituteBeijing 100024China

Silicon(Si)has emerged as a promising anode material for lithium-ion batteries(LIBs)due to its extremely high theoretical capacity of 4200 mAh·g^(-1).However,its practical application is limited by several critical challenges,including severe volume expansion and poor electrical ***,we employ a two-dimensional(2D)oxygen modification engineering approach to fabricate 2D oxygen-functionalized CaSi_(2)(CaSi_(2)O_(x))*** the preparation of 2D CaSi_(2) layers,O atoms are gradually incorporated onto their *** resulting 2D CaSi_(2)O_(x) layers have a thickness of 3-5 nm,closely matching the theoretical thickness of 6-10 *** used as lithium anodes,the 2D CaSi_(2)O_(x) layers exhibit exceptional electrochemical performance,maintaining stability over 3000 cycles at an ultrahigh current density of 30 A·g^(-1).By tailoring the surface properties,their pseudocapacitive charge storage mechanism is significantly enhanced,effectively overcoming the intrinsic limitations of traditional Si *** study highlights the promise of 2D surface engineering in the development of advanced materials for next-generation LIBs.

关键词： two-dimensional(2D)CaSi_(2)O_(x) Si anode volume change pseudocapacitive surface modification lithium storage

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Adsorption removal of mercury from flue gas by metal selenide:A review

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Journal of Environmental Sciences 2025年第2期148卷 420-436页

作者： Yang Zheng Guoliang Li Yi Xing Wenqing Xu Tao Yue School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringInnovation Academy for Green ManufactureChinese Academy of SciencesBeijing 100190China

Mercury(Hg)pollution has been a global concern in recent decades,posing a significant threat to entire ecosystems and human health due to its cumulative toxicity,persistence,and transport in the *** intense interaction between mercury and selenium has opened up a new field for studying mercury removal from industrial flue gas *** the advantages of good Hg^(0) capture performance and lowsecondary pollution of the mineral selenium compounds,the most noteworthy is the relatively low regeneration temperature,allowing adsorbent regeneration with low energy consumption,thus reducing the utilization cost and enabling recovery of mercury *** paper reviews the recent progress of mineral selenium compounds in flue gas mercury removal,introduces in detail the different types ofmineral selenium compounds studied in the field ofmercury removal,reviews the adsorption performance of various mineral selenium compounds adsorbents on mercury and the influence of flue gas components,such as reaction temperature,air velocity,and other factors,and summarizes the adsorption mechanism of different fugitive forms of selenium *** on the current research progress,future studies should focus on the economic performance and the performance of different carriers and sizes of adsorbents for the removal of Hg^(0) and the correlation between the gas-particle flow characteristics and gas phase mass transfer with the performance of Hg^(0) removal in practical industrial *** addition,it remains a challenge to distinguish the oxidation and adsorption of Hg^(0) quantitatively.

关键词： Non-conventional pollutants Adsorbents Metal selenides Flue gas Mercury removal

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Upcycling of polyethylene terephthalate to 1,4-cyclohexanedimethanol in water

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Science China Chemistry 2025年第5期68卷 2101-2109页

作者： Shuhui Fang Zhiwen Gao Xinrui Shi Min Zhang Wei Zhang Yue Liu State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular EngineeringEast China Normal University Engineering Center for Sustainable Carbon Science and Technology East China Normal University Institute of Eco-Chongming

The recycling of waste polyethylene terephthalate（PET）, an extensively used polymer as plastic and fiber materials, has become an urgent topic due to the rapid generation and accumulation of plastic waste into the environment. Current chemical recycling approaches to depolymerize and convert PET into 1,4-cyclohexanedimethanol（CHDM）, an important chemical in the production of advanced polyesters, predominantly use organic solvents, such as alcohols or dioxane. Herein, we developed an environmentally friendly and economically viable pathway for converting PET to CHDM using water as the solvent. In this process, PET is sequentially hydrolyzed in water, hydrogenated to 1,4-cyclohexane dicarboxylic acid（CHDA）, and then reduced to CHDM. The PET conversion rate is self-enhanced in aqueous medium via acid-catalyzed hydrolysis by the generated CHDA intermediate. A Pd-based catalyst（e.g., Pd/C） selectively hydrogenates the arene ring of the PET monomer, terephthalic acid intermediate, and a Ru-Sn/C bimetallic catalyst reduces its COOH to CH2OH group. At optimized reaction conditions, a complete conversion of PET and 80.1% yield of CHDM are obtained. Alternatively, this approach can also efficiently produce CHDA from PET, with a yield up to 86.4%.

关键词： polyethylene terephthalate (PET) 1,4-cyclohexanedimethanol (CHDM) hydrogenation hydrogenolysis

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Dodecylamine-mediated synthesis of caron-supported platinum-ruthenium alloy nanoparticles with ultrafine sizes towards high-efficiency methanol oxidation electrocatalysis

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Progress in Natural Science:Materials International 2025年第1期35卷 215-221页

作者： Liang Chu Zheng Rong Mengyuan Ma Feng Guo Shaonan Tian Jun Yang School of Electronics and Information & Institute of Carbon Neutrality and New Energy Hangzhou Dianzi University State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

For fully leveraging the advantages of PtRu alloys as electrocatalysts to catalyze methanol oxidation reaction（MOR）, we herein report an ambient-temperature method for directly synthesizing carbon-supported PtRu alloy nanoparticles with ultrafine sizes in an organic medium towards high-efficiency MOR. This strategy involves the dodecylamine（DDA）-mediated extraction of Pt and Ru ions from water to toluene, and then mixing them with carbon substrate, followed by NaBH4reduction in the same organic medium. Profiting from their ultrafine sizes of ca. 1.68 nm, the as-prepared PtRu nanoparticles supported on carbon substrate show a mass activity of 0.93 A mg-1and a specific activity of 10.56 mA cm-2, respectively, both of which are much higher than those of the commercial PtRu/C catalyst.

关键词： Carbon substrate Dodecylamine-mediated extraction Methanol oxidation reaction PtRu alloy nanoparticles Ultrafine size

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A phenylboronic-acid functionalized liquid photonic crystal reagent for convenient and reliable detection of glucose

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Nano Research 2025年第2期18卷 699-707页

作者： Yanxuan Zhao Huimin Zhu Jianping Ge State Key Laboratory of Petroleum Molecular&Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Institute of Eco-Chongming Shanghai 202162China

Photonic crystal sensing is an emerging technique that directly indicates the physicochemical changes with the change of structural ***,there are still challenges in material synthesis,ease of use,and reproducibility of detection for traditional photonic crystal(PC)***,a phenylboronic-acid functionalized SiO2 liquid photonic crystal(PBA-LPC)reagent was developed for reliable detection of glucose *** is convenient to prepare/use the LPC reagent because people only need to mix the responsive substance or the analyte solution with the LPCs in synthesis/*** sensing was based on the mechanism that the mixing of PBA-LPC reagent with glucose could release H+cations from PBA,which inhibited the deprotonation of the silanol group,weakened the particle surface charge,and blue-shifted the reflection of *** PBA LPC reagents responded to the glucose in different concentration ranges depending on the dosage of PBA,which ensured both a broad range detection and an accurate detection within a specific ***,it reported reproducible results due to the precise introduction of PBA and its sufficient interaction with ***,the PBA-LPC reagent showed a selective response to glucose and good anti-interference capability against the presence of NaCl,CaSO_(4),KH_(2)PO_(4),and Vitamin *** to these properties,the PBA-LPC reagent could serve as a new material for blood sugar tests and it also demonstrated the great potential of LPCs in sensing applications.

关键词： phenylboronic-acid liquid photonic crystal detection reagent glucose sensing

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Synthesis ofδ-MnO_(2)via ozonation routine for low temperature formaldehyde removal

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Journal of Environmental Sciences 2025年第1期147卷 642-651页

作者： Guijun Fan Yacong Guo Shaohua Chai Le Zhang Jian Guan Guojun Ma Ning Han Yunfa Chen State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Science and Technology on Particle Materials Institute of Process EngineeringChinese Academy of SciencesBeijing 361021China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Petrochemical Engineering&Environment Zhejiang Ocean UniversityZhoushan 316022China

Nowadays,it is still a challenge to prepared high efficiency and low cost formaldehyde(HCHO)removal catalysts in order to tackle the long-living indoor air ***,δ-MnO_(2)is successfully synthesized by a facile ozonation strategy,where Mn^(2+)is oxidized by ozone(O_(3))bubble in an alkaline *** presents one of the best catalytic properties with a low 100%conversion temperature of 85℃for 50 ppm of HCHO under a GHSV of 48,000 mL/(g·hr).As a comparison,more than 6 times far longer oxidation time is needed if O3 is replaced by O_(2).Characterizations show that ozonation process generates a different intermediate of tetragonalβ-HMnO_(2),which would favor the quick transformation into the final productδ-MnO_(2),as compared with the relatively more thermodynamically stable monoclinicγ-HMnO_(2)in the O_(2)***,HCHO is found to be decomposed into CO_(2)via formate,dioxymethylene and carbonate species as identified by room temperature insitu diffuse reflectance infrared fourier transform *** these results show great potency of this facile ozonation routine for the highly activeδ-MnO_(2)synthesis in order to remove the HCHO contamination.

关键词： δ-MnO_(2) Ozone oxidation HCHO oxidation In-situ DRIFTS

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Microfluidic reactors for paired electrosynthesis:Fundamentals,applications and future prospects

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Green Energy & Environment 2025年第3期10卷 471-499页

作者： Hao Xue Zhi-Hao Zhao Menglei Yuan Guangjin Zhang Queen Mary University of London Engineering School Northwestern Polytechnical University710129Xi'anChina State Key Laboratory of Solidification Processing and School of Materials Science and Engineering Northwestern Polytechnical University710072Xi'anChina CAS Key Laboratory of Green Process Engineering Institute of Process EngineeringChinese Academy of Sciences100190BeijingChina Center of Materials Science and Optoelectronics Engineering University of ChineseAcademy of Sciences100049BeijingChina

Paired electrosynthesis has received considerable attention as a consequence of simultaneously synthesizing target products at both cathode and anode,whereas the related synthetic efficiency in batch reactors is still undesirable under certain ***,laminar microfluidic reactor offers prospective options that possess controllable flow characteristics such as enhanced mass transport,precise laminar flow control and the ability to expand production scale *** this comprehensive review,the underlying fundamentals of the paired electrosynthesis are initially summarized,followed by categorizing the paired electrosynthesis including parallel paired electrosynthesis,divergent paired electrosynthesis,convergent paired electrosynthesis,sequential paired electrosynthesis and linear paired ***,a holistic overview of microfluidic reactor equipment,integral fundamentals and research methodology as well as channel extension and scale-up strategies is *** established fundamentals and evaluated metrics further inspired the applications of microfluidic reactors in paired *** work stimulated the overwhelming investigation of mechanism discovery,material screening strategies,and device assemblies.

关键词： Paired electrosynthesis Microfluidic reactor Laminar flow Scaling-up strategy

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