SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Zhuolin Qing,Zetong Li,Zifan Zhong,Hang Zhong,Qirui Qin,Zekun Yang,Xin Yang,Junmin Chen
Lanthanum (La)-based hydroxide materials are considered promising candidates for phosphate removal, but their adsorption efficiency is often limited by the hydroxide (OH – ) release and slow mass transfer. In this study, we synthesized lanthanum hydroxyl carbonate supported onto magnetic porous biochar (La-FPBC 0.5 ) for advanced phosphate removal from actual secondary effluent of wastewater. La-FPBC 0.5 significantly enhanced phosphate removal by releasing more carbonate (CO 3 2– ) rather than hydroxy (–OH) during adsorption. Density functional theory calculations revealed that the absolute value of absorb adsorption energy for ion exchange in La-FPBC 0.5 is 4.48 eV, higher than that for ligand exchange (3.11 eV). The adsorption kinetic rate constant of La-FPBC 0.5 reached 1.7 × 10 -3 g/(mg −1 min), which is 1.8 times that of La(CO 3 )(OH). Furthermore, La-FPBC 0.5 removed up to 151.5 mg P/g of phosphate from wastewater, representing a 1.6-fold increase compared to La(CO 3 )(OH), surpassing not only commercial La-based materials but also most reported adsorbents. It maintained over 85 % of its phosphate adsorption capacity in the presence of anions or humic acid and showed effective adsorption across various water sources, including river, campus lake, and tap water, with a capacity exceeding 120 mg P/g. La-FPBC 0.5 also exhibited excellent stability, retaining 95 % of its capacity after five adsorption–desorption cycles. Notably, La-FPBC 0.5 treated approximately 1800 bed volumes of phosphate-containing wastewater to below 0.1 mg/L in a fixed-bed adsorption mode, with the recovered phosphate suitable for plant growth. These results suggest that La-FPBC 0.5 is an ideal candidate for phosphate removal in practical applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Rui Zhao,Yacong Hu,Wei Ding,Ke Ren,Xinyi Gou,Chun Zhao,Huaili Zheng
Phosphite [P(III)], an emerging eutrophication pollutant, has attracted limited attention in recent years. Owing to the higher solubility and resistance to biotransformation of P(III), oxidation of P(III) to phosphate [P(V)] is considered to be necessary to enhance P(III) removal. Herein, an efficient and regenerable magnetic La 2 (CO 3 ) 3 /CoFe 2 O 4 /biochar composite (LCB) was constructed through a facile one-pot hydrothermal method to treat phosphite-laden wastewater. LCB coupled with peroxymonosulfate (PMS) exhibited satisfactory P(III) removal performance through a one-step process for simultaneous oxidation and adsorption of P(III). The adsorption capacity of LCB/PMS for P(III) (71.94 mg/g) was much higher than that of LCB. LCB/PMS system showed high P(III) removal efficiency of 96.62 %, wide pH ranging from 4.0 to 9.0, and good reusability. It also worked well in the existence of anions and humic acid. The quenching experiments and electron spin resonance tests (ESR) revealed the critical role of SO 4 • - in the P(III) oxidation process. Characterization results demonstrated that electrostatic attraction and ligand exchange were responsible for P(III)/P(V) adsorption. Moreover, LCB/PMS system presented desirable performance in eliminating a series of typical organic and inorganic phosphorus. The LCB/PMS system provides a promising and sustainable technology for the purification of P(III)-contaminated water.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22028-22038
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IF 2.22
Peng Qirui,Yang Lu,Zhao Qiuying,Ma Yizhou,Ji Hongli,Qiu Jinhao
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co 3 [Co(CN) 6 ] 2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co 3 [Co(CN) 6 ] 2 appeared to significantly promote the interfacial coupling effect within P(VDF-HFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d 33 of ~ 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k 33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2023
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IF 2.8
Kaibo Hu,Yucheng Liu,Xiaowen Zhou,Fang Gao,Chuanqi Zhang,Tianci Chen,Ke Li,Jiuyang Lin,Xuewei Li
The waste products of NdFeB magnets are an attractive resource for the recovery of rare earth elements (REEs), especially for neodymium [Nd]. Conventional methods employed to remove ferric (Fe[II]) from Nd solutions involve high energy consumption and the extensive use of chemicals, including oxidants and pH regulators, leading to substantial wastewater generation. In this work, an environmentally friendly approach utilizing CaMg(CO3)2 was presented to remove Fe(II) from Nd solution. Under optimized conditions, including a reaction temperature of 70°C, a CO32-/Fe2+ ratio of 1.5/1, a reaction time of 240 min, and an initial concentration of 200 mg/L, the heterogeneous precipitation reaction on the surface of CaMg(CO3)2 exhibited an exceptional Fe(II) removal efficiency of 98.6%, with a negligible loss of Nd (only 0.8%). It was observed that the CaMg(CO3)2 not only provide a suitable alkaline environment for the selective precipitation of Fe(II), but also significantly enrich the concentration of dissolved oxygen at a high temperature. In fact, at a CaMg(CO3)2 concentration of 2 g/L, the dissolved oxygen concentration in the solution increased significantly to 15.5 mg/L at 70°C. Consequently, the usage of CaMg(CO3)2 facilitated the rapid conversion of Fe(II) to Fe(III) without the need for additional oxidants, which was perfect for the removal of Fe(II) rather than Nd.
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Journal of Energy Chemistry
·
2024
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IF 14
Fengli Wei,Jinghao Shen,Jiayin Xie,Zuyang Luo,Luyan Shi,Tayirjan Taylor Isimjan,Xiulin Yang,Jieshan Qiu,Bin Wu
Understanding and manipulating the structural evolution of water oxidation electrocatalysts lays the foundation to finetune their catalytic activity. Herein, we present a synthesis of NiSe 2 -Ce 2 (CO 3 ) 2 O heterostructure and demonstrate the efficacy of interfacial Ce 2 (CO 3 ) 2 O in promoting the formation of catalytically active centers to improve oxygen evolution activity. In-situ Raman spectroscopy shows that incorporation of Ce 2 (CO 3 ) 2 O into NiSe 2 causes a cathodic shift of the Ni 2+ →Ni 3+ transition potential. Operando electrochemical impedance spectroscopy reveals that strong electronic coupling at heterogeneous interface accelerates charge transfer process. Furthermore, density functional theory calculations suggest that actual catalytic active species of NiOOH transformed from NiSe 2 , which is coupled with Ce 2 (CO 3 ) 2 O, can optimize electronic structure and decrease the free energy barriers toward fast oxygen evolution reaction (OER) kinetics. Consequently, the resultant NiSe 2 -Ce 2 (CO 3 ) 2 O electrode exhibits remarkable electrocatalytic performance with low overpotentials (268/304 mV @ 50/100 mA cm −2 ) and excellent stability (50 mA cm −2 for 120 h) in the alkaline electrolyte. This work emphasizes the significance of modulating the dynamic changes in developing efficient electrocatalyst.
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APPLIED SURFACE SCIENCE
·
2026
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IF 6.6
Liang Luo,Qi Shen,Lixing Wang,Huiluan Qin,Song Lu,Yeqing Wang,Jiadi Ying,Tiancun Liu,Min Guo,Zhixin Yu
Hierarchical Co(OH) 2 /FeOOH is constructed via a facile one-step heterogeneous nucleation strategy. • Self-sacrificial FeOOH nanoneedles protects Co-based active phases under high current. • Efficient Co 2+ →Co 3+ conversion enriches high-valence active sites for accelerated OER kinetics. • The catalyst delivers an low overpotential of 275 mV at 200 mA cm −2 . • The catalyst achieves remarkable operational stability for over 450 h at 1 A cm −2 for OER. Cobalt hydroxide-based catalysts are promising candidates for electrochemical water splitting, yet their practical application in industrial electrolysis is hindered by insufficient activity under high-current conditions. Herein, we rationally construct a hierarchical Co(OH) 2 /FeOOH composite via a one-step heterogeneous nucleation strategy, where FeOOH nanoneedles are uniformly anchored on Co(OH) 2 nanosheets frameworks. The composite achieves an ultra-low overpotential of 275 mV at 200 mA cm −2 for oxygen evolution reaction (OER), with a lower Tafel slope. More notably, it maintains stability with negligible potential fluctuation over 450 h under an industrially relevant current density of 1 A cm −2 . The FeOOH promotes efficient Co 2+ →Co 3+ valence transition, while the hierarchical interfacial interactions enhance charge transfer efficiency and stabilize high-valence Co active species. A unique self-sacrificial mechanism is unveiled that preferential tip dissolution of FeOOH nanoneedles effectively protects the underlying Co-based active sites from over-oxidation and structural collapse, thereby ensuring long-term catalytic stability. Mechanistic studies further suggest that Co(OH) 2 /FeOOH exhibits enhanced lattice-oxygen-participated character relative to CoFe-LDH, which tends to follow the adsorbate evolution mechanism. This work develops a self-sacrificial interface engineering strategy to boost the activity and stability of Co(OH) 2 , and provides a feasible structural design paradigm for developing durable OER electrocatalysts toward industrial-relevant high-current conditions. A unique self-sacrificial interface engineering strategy to boost the activity and stability of Co(OH) 2 for oxygen evolution reaction. Download: Download high-res image (157KB) Download: Download full-size image
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ENVIRONMENTAL RESEARCH
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2026
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IF 8.2
Shihan Wang,Weike Zheng,Haifeng Shi,Yigang Chen
In peroxymonosulfate (PMS) activation processes, the relatively slow redox kinetics of metal ions have been a key factor limiting both PMS activation efficiency and photocatalytic performance. In this study, a Co 3 O 4 /PTFE composite with integrated piezoelectric and photothermal properties was successfully constructed, which significantly enhanced the Co 3+ /Co 2+ cycle and thereby promoted PMS activation for efficient tetracycline (TC) degradation. Under the dual stimulation of mechanical agitation and visible light irradiation, the Co 3 O 4 /PTFE composite exhibited enhanced photothermal conversion and piezoelectric performance, which significantly promoted the generation of reactive species such as SO 4 •- and •OH. Compared with pristine Co 3 O 4 , CoP-2 demonstrated a superior TC degradation efficiency of up to 83% in the PMS system. X-ray photoelectron spectroscopy (XPS) analysis revealed that the introduction of polytetrafluoroethylene (PTFE) induced interfacial strain, modulated the valence state of cobalt species, and optimized the surface electronic structure, thereby facilitating the formation of active sites and enhancing electron transfer processes. Free radical trapping experiments further identified the dominant reactive species and revealed the underlying synergistic catalytic mechanism. Moreover, CoP-2 maintained excellent stability after multiple degradation cycles. This study provides a novel strategy for the design of multifunctional synergistic catalysts and expands the application potential of piezo-photothermal/PMS systems in environmental purification.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Dan Liu,Yudong Li,Jian Li,Chengyu Wang,Jingwei Li,Rong Wang,Xiaohui Yang
Mn incorporation into Co 3 O 4 induces Jahn–Teller distortion and Co 3+ spin-state transition ( t 2 g 6 e g 0 → t 2 g 5 e g 1 ). • Such electronic modulation weakens Co O bonding and lowers Co 3+ → Co 4+ kinetic barrier. • Mn-Co 3 O 4 achieves ∼100% HMF conversion, 97.8% FDCA yield, and 96.0% Faradaic efficiency at 1.4 V vs. RHE. • DFT reveals that Mn incorporation reduces the PDS free energy from 4.05 eV to 2.11 eV by facilitating α-C–H cleavage. The electrooxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is a key transformation for sustainable polymer production, yet its efficiency is hampered by the kinetically demanding cleavage of the α-C–H bonding in the hydroxymethyl group. Herein, we demonstrate that Jahn–Teller distortion serves as an effective strategy to overcome this limitation. By incorporating Mn 3+ ( t 2g 3 e g 1 ) into Co 3 O 4 , we induce a spin-state transition of Co 3+ from low-spin ( t 2g 6 e g 0 ) to intermediate-spin ( t 2g 5 e g 1 ), which weakens Co O bonding and lowers the kinetic barrier for Co 3+ → Co 4+ oxidation. Compared with that of Co 3 O 4 , Mn-Co 3 O 4 achieves a complete HMF conversion with 97.8% of FDCA yield and 96.0% of Faradaic efficiency at 1.4 V vs. RHE, representing a 3.72-fold enhancement in intrinsic activity. Computational and theoretical analysis corroborates that Mn-induced Jahn–Teller electronic modulation not only benefits the adsorption and activation of HMF molecules but also facilitates the cleavage of α-C–H bonding, thereby lowering the reaction barrier. This work establishes Jahn–Teller-distortion-mediated Co 3+ /Co 4+ redox regulation as a focused electronic-structure strategy for promoting high-valence-Co-driven HMF electrooxidation. The Jahn-Teller-driven generation of high-valence Co 4+ species in pristine Co 3 O 4 by the incorporation of Mn 3+ ( t 2g 3 e g 1 ) accelerate the rate-determining initial oxidation of hydroxymethyl groups, markedly enhancing reaction kinetics of HMF to FDCA. Download: Download high-res image (150KB) Download: Download full-size image
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Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·369-379
·
IF 10.733
Chun Li,Lingling Shi,Lili Zhang,Peng Chen,Junwu Zhu,Xin Wang,Yongsheng Fu
Organic two-dimensional (2D) materials with unique optic-electronic properties are attracting great interest for application in functional electronic devices. However, low electronic conductivity and poor stability still are major defects of 2D organic systems. Herein, we demonstrated ultrathin 2D conductive cobalt–hexaaminobenzene metal–organic coordination polymer nanosheets (Co–HAB-NSs) with a thickness of ∼4.5 nm. The as-prepared Co–HAB-NSs exhibit a low overpotential (310 mV @ 10 mA cm−2) and high durability in 1 M KOH. The experimental and computational results show that the high electrocatalytic activity is ascribed to the enhanced electrochemically active surface area as well as the dense and stable catalytic active sites of Co–HAB-NSs.
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Molecular Catalysis
·
2023
·
IF 4.6
Jiahao Chen,Yiqing Zeng,Shule Zhang,Zhaoxiang Zhong,Qin Zhong
Interface interaction existed in the multicomponent determines the catalytic performance of composite catalysts. Herein, a Co 3 O 4 -LaCoO 3 (Co-La) composite catalyst with strong spinel-perovskite interface interaction was successfully synthesized via a one-pot sol-gel method for the catalytic oxidation of toluene. The activity test results showed that the optimal 1Co 3 O 4 –4LaCoO 3 (1Co-4La) catalyst exhibits much higher catalytic activity (T 90 = 215 °C, GHSV = 50,000 h −1 ) than Co 3 O 4 (T 90 = 295 °C), LaCoO 3 (T 90 = 256 °C) and 1Co 3 O 4 /4LaCoO 3 (1Co/4La) (prepared by mechanical ball-milling, T 90 = 285 °C). Characterizations revealed that the strong spinel-perovskite interface interaction generated between the Co 3 O 4 spinel and LaCoO 3 perovskite in 1Co-4La facilitates the transfer of interfacial electrons, contributing to the exposure of surface active Co 3+ and the enhanced oxidation ability of surface active Co 3+ on 1Co-4La. In addition, the reactive lattice oxygen of surface Co 3+ –O on 1Co-4La effectively promotes the decomposition of toluene into CO 2 , enabling the low-temperature oxidation of toluene through the Mars-van Krevelen (MvK) mechanism. This work provides insight into the promotional effect of multicomponent interface interaction on enhancing catalytic performance of spinel-perovskite composite catalysts.
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MOLECULES
·
2024
·Vol. 29
·期 16
·3846
·
IF 4.2
Lei Huang,Jian Qian,Shijian Sun,Zheng Li,Dechuan Li
A novel method for synthesizing dumbbell-shaped (Gd1−xTbx)2O(CO3)2·H2O (GOC:xTb3+) phosphors using sodium carbonate was investigated. An amount of 1 mmol of stable fluorescent powder can be widely prepared using 3–11 mmol of Na2CO3at a pH value of 8.5–10.5 in the reaction solution. The optimal reaction conditions for the phosphors were determined to be 7 mmol for the amount of sodium carbonate and a pH of 9.5 in the solution. Mapping analysis of the elements confirmed uniform distribution of Gd3+and Tb3+elements in GOC:xTb3+. The analysis of fluorescence intensity shows that an optimal excitation wavelength of 273 nm is observed when the concentration of Tb3+is between 0.005 and 0.3. The highest emission intensity was observed for GOC:0.05Tb3+with a 57.5% maximum quantum efficiency. The chromaticity coordinates show that the color of GOC:Tb3+is stable and suitable for fluorescence recognition. Latent fingerprint visualization reveals distinctive features like whorls, hooks, and bifurcations. Therefore, the sodium carbonate method offers an effective alternative to traditional urea chemical reaction conditions for preparing GOC:Tb3+.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jichao Zhu,Xianli Dong,Kunhao Li,Siyu Tian,Yao Kong,Weitong Chen,Shuping Zhou
In the field of pharmaceutical research and development, the development of nano drug carriers based on intercalation structures has become one of the important development directions. Hydrotalcite (LDHs) and its derivatives have the advantages of low cost, simple synthesis, high drug loading efficiency, good biocompatibility, and easy degradation, and have received widespread attention in the field of biomedicine. Based on this, we synthesized 5-aminosalicylate (5-ASA) intercalated NO 3 based and CO 3 based ZnAl-LDHs drug delivery systems using ion-exchange and chemical co-precipitation methods, respectively. The crystalline structure, morphology, thermal stability, and host-guest interaction were characterized in detail by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Ultraviolet visible spectroscopy (UV), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopic (XPS). The drug loading, drug release behavior and release kinetic of 5-ASA intercalated ZnAl-LDHs were studied. The characterization results indicated that the intercalation mode of the drug and the strength of the host-guest interaction are related to the interlayer anion type and synthesis process of ZnAl-LDHs. The amount of 5-ASA loaded into LDHs from an ion-exchange process was 28.6 and 13.8 wt% for NO 3 − and CO 3 2− based LDHs, respectively, whereas it was 6.9 and 10.4 wt% for co-precipitation process. The modeling kinetics results indicated that the release process of 5-ASA by ZnAl-LDHs intercalated with 5-ASA conforms to the parabolic diffusion model. These results indicated that the drug delivery system was controlled by diffusion of 5-ASA ions into aqueous solution through exchange with phosphate anions.
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