Journal of Materials Research and Technology-JMR&T
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2024
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IF 6.2
Yahao Geng,Shan Zhang,Yuying Wang,Shuochao You,Jing Cui,Guiyong Xiao
Hydroxyapatite (HAP), as an inorganic material with the biocompatible and bioactive, widely exists in hard tissues such as teeth and bones of mammals. However, the inherent brittleness of traditional HAP severely limits its clinical applications in load-bearing. HAP ultralong nanofibers with good flexibility can overcome this problem due to their high aspect ratio. In this work, the highly ordered HAP nanofibers are successfully synthesized by the calcium oleate precursor solvothermal method. The effects of ratio of PO 4 3− and CO 3 2− on the microstructure, orientation degree, and properties are researched. The results show that the arrangement of HAP nanofibers first changes from loose state to ordered dense structure, then to ordered loose form, and finally to disordered nanofibers with the increase of the PO 4 3− /CO 3 2− ratio. Meanwhile, the chemical composition, crystallinity, and thermal stability also change because of various PO 4 3− /CO 3 2− . In addition, the formation mechanism of highly ordered HAP nanofibers is explored as well in this work. Besides, the HAP ultralong nanofibers prepared by solvothermal method can be designed into advanced functional materials with highly ordered structures, which is expected to overcome the limitation of its difficult application in the load-bearing field.
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Surfaces and Interfaces
·
2026
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IF 6
Xinxiong Wang,Yunpeng Liu,Aiting Xu,Qiao Zhang,Guangxing Yang,Lianpeng Tong,Feng Peng
The conversion of CO 2 into value-added chemicals using solar energy represents an ideal pathway to address the energy and environmental crises. However, the application of photocatalytic CO 2 reduction is still being hindered by the low CO 2 mass transfer and rapid charge carriers’ recombination. In this study, a Ga 2 O 3 /La 2 O 2 CO 3 composite heterojunction (GaO/LaOCO) with a surface rich in La(OH) 3 was constructed, successfully achieving both enhanced CO 2 adsorption and charge-separation efficiency. The composite undergoes a surface reconstruction of La(OH) 3 to La 2 (CO 3 ) 3 , resulting in a surface CO 3 2− layer that is conducive to CO 2 chemical adsorption and activation. In addition, band structure analysis confirms the formation of an energy-level alignment favorable for directional charge transfer. Under simulated sunlight, the prepared composite exhibits optimal photocatalytic CO 2 reduction activity without sacrificial agents and photosensitizers, achieving a CO production rate of 15.33 μmol g −1 over 5 h, along with good cycling stability. This enhanced activity originates from the synergy between surface La(OH) 3 for CO 2 enrichment/activation and Ga 2 O 3 for efficient electron transport. This work provides a strategy for enhancing photocatalytic CO 2 reduction performance by tailoring catalyst surface properties and interfacial structures.
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RSC Advances
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2020
·Vol. 10
·期 42
·24764-24771
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IF 3.119
Yu Wei,Yan Xia
A dual emission metal–organic framework (IRMOF-10-Eu) was prepared and used as a ratiometric fluorescent sensor for CO32− detection. IRMOF-10-Eu had good stability and excellent luminescence in aqueous solution. IRMOF-10-Eu showed dual fluorescence emission from the ligand and Eu3+ with single excitation. Upon treatment with CO32−, the fluorescence ratio (I624/I358) of the probe displayed significant change. The relative fluorescence intensity ratio (I624/I358) and CO32− concentration had a linear relationship in 50–300 μM range with a low detection limit of 9.58 μM. And the luminescence probe of CO32− showed a fast detection time. The possible mechanism was investigated. CO32− changed the structure of IRMOF-10-Eu and interrupted the energy transfer process. Thus, the fluorescence emission intensity of the ligand was increased and Eu3+ was decreased with the addition of CO32−. IRMOF-10-Eu was used to detect CO32− in seawater, which showed good prospect in practical application. Subsequently, a highly selective and sensitive probe, IRMOF-10-Eu, may pave an efficient way for CO32− detection in seawater.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
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IF 2.4
Jia Xu,Xun Wang,Jiazheng Qin,Ziwei Hu,Ruyi Lin,Yong Ma,Dan Li,Lingzong Meng
The solid–liquid phase equilibria of the quaternary system Na+, Cs+//Cl–, CO32––H2O and its subsystem Na2CO3–Cs2CO3–H2O at 308.15 K were studied by the isothermal dissolution method. The phase diagram of the system Na2CO3–Cs2CO3–H2O is composed of two single-salt crystallization fields of Na2CO3·H2O and Cs2CO3·H2O, two solubility univariant curves, and one invariant point. The dry-salt phase diagram of the quaternary system consists of three invariant points, seven univariant curves, and five crystallization regions corresponding to Na2CO3·H2O, NaCl, solid solution [Cs1–x(Na·H2O)x]Cl, Cs2CO3·H2O, and double salt CsCl·2NaCl·2H2O. The areas of crystallization zones decrease according to the above order. The Jan̈ecke index of H2O, pH, and refractive index of the liquid phase in the quaternary system change regularly with the Jan̈ecke index of Cs+. These results on the phase diagram of the quaternary system can supply theoretical references for cesium salt separation from carbonate-type brine.
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JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 8.8
Te Tu,Jiaqi Zhang,Mengni Xiao,Feihong Liang,Enyu Wang,Lanlan Wu,Long Ji,Shuiping Yan
A novel strategy is proposed to lower CO 2 regeneration energy in DAC. • Monovalent-selective AEMs capable of selectively separating HCO 3 − and CO 3 2− were prepared. • The optimized membrane exhibited a superior HCO 3 − /CO 3 2− perm-selectivity of 24.2. • Specific energy consumption for CO 2 regeneration was reduced by 59.3% compared to commercial AEMs. • The fabricated AEMs exhibited both high HCO 3 − /CO 3 2− perm-selectivity and total carbon permeability. Direct air capture (DAC) is an emerging technology for reducing atmospheric CO 2 content directly, but its current deployment is limited by the high energy demand in CO 2 regeneration. As an energy-conserving alternative, bipolar membrane electrodialysis (BPMED) exploits pH differentials to drive CO 2 regeneration without external thermal inputs or pressurized environments. In this work, we propose a new strategy to construct anion exchange membranes (AEMs) with high carbon loading capacity, enabling preferential permeation of bicarbonate (HCO 3 − ) over carbonate (CO 3 2− ) to significantly reduce specific electrical energy consumption for CO 2 regeneration in BPMED. AEMs were synthesized in a single-casting-process fabrication that integrates the dual advantages of electrostatic regulation and self-crosslinking, achieved through the incorporation of trimethylamine and sulfamerazine (SF) into 2,6-dimethyl-1,4-phenylene oxide (BPPO). The resulting membranes exhibited low water uptake (<12.6%), minimal linear expansion rate (<3.5%), and an area resistance as low as 2.7 Ω cm 2 . The perm-selectivity ( P CO 3 2 ‐ HCO 3 ‐ ) declined with increasing applied current density. At 5 mA/cm 2 current density, the optimized AEM (BPPO-SF-0.12) exhibited a HCO 3 − permeability of 0.21 mmol/(cm 2 ·h) and a CO 3 2− permeability of 0.04 mmol/(cm 2 ·h), yielding a perm-selectivity value of 24.2, substantially higher than that of the commercial membrane (1.0). In BPMED-based CO 2 regeneration, BPPO-SF-0.12 achieved the highest CO 2 regeneration ratio of 45.3%, and its energy consumption was only 240 kJ/mol, corresponding to a 59.3% reduction relative to the commercial membrane (590 kJ/mol). These findings substantiate the efficacy of the proposed strategy, revealing that AEMs with elevated carbon loading concurrently augment CO 2 regeneration ratio and energy performance. Such results establish a practical framework for energy-minimal CO 2 liberation via BPMED technology. Download: Download high-res image (318KB) Download: Download full-size image
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Qing Hao,Huan Zhou,Mengli Zhang,Si Wu,Junfang Yang
Rare-earth ore concentrate is calcined at high temperature by the alkaline method, and the associated elements fluorine and phosphorus are enriched in the form of sodium fluoride and sodium phosphate in water elution. To separate and recover fluorine and phosphorus from the aqueous solution, the solid–liquid equilibrium behaviors of the quaternary systems Na+//F–, CO32–, PO43–-H2O and their two sub-ternary systems NaF-Na3PO4-H2O and Na2CO3-Na3PO4-H2O at 313.15 K were studied via the isothermal solubility phase equilibrium method. Solubility data, liquid density and pH, two complete isothermal phase diagrams of the ternary system, and one complete isothermal phase diagram of the quaternary system were obtained. The results showed that two double salts NaF·2Na3PO4·19H2O and Na3PO4·3Na2CO3·8H2O occurred in the respective ternary systems. Five solid species of one anhydrous salt of NaF, two hydrous salts of Na2CO3·H2O and Na3PO4·12H2O, and two double salts of Na3PO4·3Na2CO3·8H2O and NaF·2Na3PO4·19H2O were found in the quaternary system. The phase diagram of the quaternary system consisted of three invariant points, five crystallization regions, and seven univariate curves. Na3PO4 easily combined with NaF to form double salt NaF·2Na3PO4·19H2O, which occupied a larger phase region in the quaternary phase diagram. The increase in Na2CO3 will lead to the decrease in the solubility of Na3PO4 and NaF in the system.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Kuo Zhou,Xingfan Wang,Junfang Yang,Fenli Jin,Huan Zhou
The solubility equilibrium of Li+, Na+//Cl–, CO32– −H2O quaternary systems at 323.15 K and 348.15 K was studied via the isothermal solubility equilibrium method, and the complete phase diagrams were obtained including the properties of liquid density and pH. Solid species of LiCl·H2O, Li2CO3, NaCl, and Na2CO3·H2O are found in the quaternary system at 323.15 K and 348.15 K, and one double salt of Li2CO3·Na2CO3 is found at 348.15 K. The liquid phase of two invariant points and five univariant curves at 323.15 and three invariant points and seven univariant curves at 348.15 K in the quaternary system is determined. Li2CO3 covers the largest solid phase region and is hardly influenced by temperature; Li2CO3–NaCl is a stable salt pair, and its cosaturated solubility is the least at the diagonal line of Li2CO3–NaCl.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Yan Kang,Liu Liping,Zhao Hongxing,Tian Lei,Xu Zhifeng,Wang Ruixiang
To overcome the problem of arsenic separation and enrichment from an alkaline leaching solution in arsenic-containing dust, a CO32--type tri-n-octylmethyl-ammonium chloride (TOMAC) method for extracting thioarsenite is proposed in this paper. Considering an alkaline leaching solution as the research object, after vulcanization pretreatment, TOMAC transformation and organic phase saturated extraction capacity were measured, and the extraction mechanism was preliminarily studied. First, Cl−-type quaternary ammonium salt was effectively transformed to HCO3--type by treating organic phase with saturated NaHCO3five times. TOMAC was effectively transformed from HCO3- to CO32- type by alkaline washing with 1.0 mol/l NaOH solution; this washing was repeated thrice. Thereafter, the effects of organic phase composition, phase ratio, extraction time, and temperature on the extraction and separation of arsenic were investigated. The results show that under the conditions of 30% CO32--type TOMAC + 15% sec-octanol + 55% sulfonated kerosene, VO/VA = 1/1, and 5 min extraction at room temperature, the single-stage extraction rate of AsIII is 85.2%. The AsIII concentration in raffinate can be reduced to less than 1.33 × 10−3 mol/l by four-stage countercurrent extraction, and the extraction rate of AsIII can exceed 98.4%.
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JOURNAL OF POWER SOURCES
·
2025
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IF 7.9
Yuheng Zhou,Guangzhe Wang,Pan Duan,Yang Hu,Gongwei Wang,Guang Feng,Lin Zhuang,Li Xiao
Technologies based on anion exchange membranes (AEMs), including fuel cells (AEMFCs) and water electrolysis (AEMWE), offer strong potential due to their use of non-precious metal catalysts and fluorine-free polyelectrolytes. However, CO 2 in cathode air causes severe voltage loss (“carbonation”), restricting large-scale AEMFC deployment. Using multiple operando techniques, this study elucidates the carbonation-induced degradation mechanism. Combined operando electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analysis reveal that carbonation elevates mass transport polarization resistance by over two orders of magnitude, dominating voltage loss. Operando EIS and anode CO 2 outlet monitoring show this effect arises not from reduced membrane conductivity, but from CO 3 2− enrichment in the anode catalyst layer ionomer via the CO 2 –CO 3 2- equilibrium. AEMFC operation follows mass conservation: CO 3 2− and OH − migrate simultaneously to the anode and participate in the hydrogen oxidation reaction in ratios determined at the cathode. In-situ surface-enhanced Raman spectroscopy (SERS) and electrochemical quartz crystal microbalance (EQCM) reveal carbonation forms a thickened electric double layer (EDL) at the electrode/polyelectrolyte interface, weakening interfacial electric fields and hindering CO 3 2− transport. Modulating anode ionomer ion exchange capacity (IEC) reduces both mass transport resistance and voltage loss, experimentally validating the mechanism and advancing understanding of EDL dynamics in AEMFCs.
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ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
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2020
·Vol. 235
·期 4
·451-466
·
IF 2.03
Yuli Xue,Yan Zhang,Xiaoling Tan,Wenqing Li,Zhongshu Li,Shaonan Xu,Peng Zhang,Jian Wang,Peiping Zhang,Shiding Miao
It is of importance to reclaim single-salt of potash from Li + -type brines of low concentration. In this work the potassium salts KHCO 3 was efficiently separated from the lithium carbonate-type brines with the aid of CO 2 carbonation. The phase field was provided in which the precipitation of KHCO 3 occurs and single-salt of potassium can be obtained. The low concentration of [Li + ] was also successfully concentrated to a high level (8.1 g/L), and this concentration can be used as sources for Li + -salts production using pre-developed strategies, which looks forward wider applications of the lithium resources of natural brine. This state-of-art was traced via isotherm evaporation on the quaternary system of Li + –K + –CO 3 2− –H 2 O at 298.15 K in which the carbonation steps were performed by CO 2 . Metastable phase diagram was found to consist of three invariant points, seven univariant curves, and four crystallization fields corresponding to Li 2 CO 3 , KHCO 3 , potassium carbonate sesquihydrate (K 2 CO 3 ⋅ 3/2H 2 O), and a potassium carbonate and potassium bicarbonate double salt (K 2 CO 3 ⋅ 2 KHCO 3 ⋅ 1.5H 2 O). There was no crystallization field corresponding to LiHCO 3 . The pH-composition diagram and density-composition diagram were also plotted. This work was carried out in aim of extracting/separating single salts of alkali metals from carbonate-type brines of west China.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
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IF 4.3
Yifeng Xu,Rui Sun,Shubo Wang,Fei Fei,Zhangyu Gan,Pin Zhou
With the development of global industry, carbon dioxide emissions surged. The conversion of carbon dioxide from the air results in some CO 3 2− , which can exacerbate environmental disasters like ocean acidification. Therefore, the content of CO 3 2− in seawater is an important indicator of the degree of ocean acidification. In this study, natural fluorescent protein phycocyanin (PC) was used as a fluorescent probe, and a fluorescence detection method was established for quantitative monitoring of CO 3 2− with quick response time (within 50 s), high sensitivity, and selectivity. The fluorescence quenching phenomenon between PC and CO 3 2− was mainly attributed to static quenching. The limit of detection (LOD) was 0.42 μM and the method was successfully applied to monitor CO 3 2− in tap water and seawater, acquiring satisfactory recovery between 99.28 % and 106.40 %. More importantly, paper-based test strips were easily fabricated using PC, enabling the rapid, visual, and on-site detection of CO 3 2− with the aid of a smartphone. The visual detection integrated with the smartphone was converted to data information (RGB value) through a Color Picker APP and successfully used for quantitative identification of CO 3 2− . By capturing fluorescent images and analyzing the corresponding RGB value via a smartphone, the linear calibration ranged from 0.5 μM to 500.0 μM with LOD of 0.11 μM was obtained. Satisfactory recoveries were acquired in tap water (98.00 %-107.50 %) and seawater (97.30 %-101.74 %), respectively. Therefore, integrating the PC fluorescent paper with a smartphone realizes the rapid, visual, and on-site detection of CO 3 2− in the water environment, which is expected to broaden application prospects of monitoring ocean acidification degree.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yu Liu,Yu Xiang,Hui Xu,Huili Li
Photocatalysis is highly efficient for the treatment of dyeing wastewater. However, the wastewater still contains a large amount of nano-TiO 2 after photocatalysis. In order to reduce the cost of nano-TiO 2 , different coagulants were used to improve the solid/liquid separation efficiency. At the same time, the reuse of flocs has raised increasing attention after coagulation. In this study, we report on the recycling of flocs for the production of AlCl 3 and TiO 2 formed flocs (AT 1 ) and Al 13 and TiO 2 formed flocs (AT 2 ) through a simple calcination process. Results indicated the flocs formation processes under different concentration of CO 3 2– were Al species distribution and coagulant dosage dependent. Without HA molecules, the reaction between Al-based coagulants and CO 3 2– are the controlling steps in the coagulation process, and Al a and Al b species had different reaction processes. The influence of HA molecules was also studied, and the HA-Al aggregates which could bridge the TiO 2 nanoparticles , and thus induce sweep flocculation . Consequently, highly enhanced aggregation rate, due to the heteroaggregation between these aggregates and TiO 2 was observed. After calcination, the AT 2 -10 and AT 2 -20 (CO 3 2– : 10, 20 mmol/L) with petal-like structures (mesoporous), relatively high specific surface areas, i.e. 83.98 m 2 /g and 78.38 m 2 /g and high photocatalytic degradation, i.e. 72.79%, 67.78% (compared to nano-TiO 2 , AT 1 -10 and AT 1 -20), were obtained. Additionally, oxygen vacancy (OV) was generated on the surface of the recycled AT 2 -10 and AT 2 -20, which display strong photocatalytic performance for the degradation of MO greater than 65%, under ultraviolet (UV) irradiation and without any sacrificial reagents. This study proposes a new perspective on recycling coagulated flocs for practical application in wastewater treatment .
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