Journal of Cleaner Production
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2024
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IF 9.7
Weixin Xian,Wenyu Wang,Juntao Guo,Jinjun Li,Jing Xu,Feng Wu
FePO 4 (FP) as a precursor of lithium iron phosphate batteries has been mass-produced in recent years and may face the problem of overproduction. Also, the phosphorus removal process in wastewater treatment plants produces large amounts of sludge containing FP. It is a huge waste of both iron and phosphorus resources if such FP cannot be utilized. This work explores a new strategy for utilizing FP to activate sulfite (S(IV)) autoxidation for simultaneous pollutant degradation and phosphorus release in water. Acid orange 7 (AO7) and several pharmaceutical and personal care products (PPCPs) were chosen as the target pollutants for the FP‒S(IV) system and the influence of pH, FP and S(IV) dosage were investigated. Typically, up to 89.5% AO7 (10 mg L −1 ) and above 60% PPCPs (10 μM) were oxidized within 90 min by adding 1 g L −1 FP and 2 mM S(IV) into the water at the initial pH 4.0. Results of quenching experiments and electron spin resonance analysis confirmed SO 5 •− as the dominant reactive species for AO7 oxidation. Meanwhile, two stages of phosphorus release from FP were observed along with the AO7 oxidation and their linear correlation over the pH range 3.0–8.0 was proven. The first stage (0–5 min) was thought to be dependent on the initial pH and was obviously faster than the second stage (10–45 min), whose rate increased linearly with S(IV) dosage. Phosphorus released high up to 24.3 μM at 90 min with 4 mM S(IV). Moreover, the mechanisms of FP activated sulfite autoxidation as well as phosphorus release were proposed, and the AO7 degradation pathway was investigated. This study provides a novel possibility for FP waste utilization and potential recovery of phosphorus resources.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Reactions
·
2025
·Vol. 6
·期 2
·24
·
IF 2.2
Kuo Zhang,Xiufei Zhao,Hang Qian,Lihong Chen,Biyu Wu,Xiao Yang,Haonan Zou,Yujiao Hu,Feng Chen,Borong Liao,Hu Zhou,Lei Zhang,Tianyi Ma,Yusheng Zhang
Cu2O, a narrow-bandgap semiconductor with visible light absorption capabilities, faces limitations in photocatalytic applications due to photocorrosion from hole self-oxidation and insufficient light absorption. In this work, a series of novel spherical Cu2O/FePO4Z-scheme heterojunctions were successfully synthesized via self-assembly to overcome these challenges. The photocurrent, electrical impedance spectroscopy (EIS), and photoluminescence (PL) tests showed that Cu2O/1.5FePO4(CF1.5) had excellent electron hole separation efficiency. Subsequently, photocatalytic degradation was utilized as a probing technique to further confirm the above conclusions, with the kinetic reaction constants of CF1.5 being 2.46 and 11.23 times higher than those of Cu2O and FePO4, respectively. After five cycles of experiments and XPS analysis, it was found that the content of Cu(I) in CF1.5 did not significantly decrease after the reaction, indicating that it has superior anti-photocorrosion performance compared to single Cu2O, which is also due to the establishment of a Z-scheme heterojunction. Systematic studies using radical scavenging experiments and ESR tests identified ·OH and ·O2−as the main active species involved in photocatalysis. The formation of a Z-scheme heterojunction not only enhances the photocatalytic activity of the CF1.5 composite but also effectively suppresses the photocorrosion of Cu2O, thereby offering a promising approach for enhancing anti-photocorrosion of Cu2O.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
ENERGY & FUELS
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2022
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IF 4.654
Xinyue Zhao,Chenhui Yang,Xiongri Gan,Li Gong,Xingbin Yan,Igor Zhitomirsky,Kaiyuan Shi
The conventional fabrication of electrodes for sodium-ion batteries (SIB) involves mixing of the active material with additives and tape-casting on metallic current collectors. Herein, an electrophoretic deposition (EPD) method has been developed to fabricate composite electrodes without using volatile and toxic solvents as well as binders. The approach is based on the EPD of amorphous FePO4 and multiwall carbon nanotube (MWCNT) from aqueous suspensions. The fabrication of FePO4 suspensions containing MWCNT and the controlled co-deposition of both materials are pivotal for the EPD of composites. Multiple dispersants with different properties are investigated as the charging, dispersing, and film-forming agents. The deposition yield of EPD films is measured under various conditions. The atomic force microscopy analysis, engaged with thermogravimetric tests, provides evidence for the formation of adhesive and conductive FePO4/MWCNT films. The dispersant concentration is optimized in order to achieve high capacity. The composite electrode, prepared by EPD, delivers a discharge capacity of 142.2 mA h g–1 at a current of 10 mA g–1. Another important finding is the possibility to fabricate full-cell SIBs, containing presodiated hard carbon as the anode and a deposited FePO4/MWCNT cathode. The deposited films show adequate capacitance retention as the charge–discharge current increased and stable cycling performance.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Guorong Hu,Kun Huang,Ke Du,Zhongdong Peng,Yanbing Cao
The recovery and regeneration of FePO 4 from lithium extraction slag (LES) are crucial steps in the closed-loop recycling of waste LiFePO 4 batteries . This necessity arises despite the low commercial value of LES, as conventional recovery methods are cost-prohibitive, leading to insufficient attention to LES recovery. The recent surge in retired batteries has resulted in a significant accumulation of LES, posing serious environmental concerns, however, the high content of Fe and P resources in LES presents a potential value. The study begins with a theoretical analysis, concluding that the reduction leaching of LES is a feasible approach. By integrating this with the Fe powder synthesis route for FePO 4 , it is found that efficient leaching of LES can be achieved using a low concentration of H 2 SO 4 , thereby significantly reducing the recovery cost. This method not only efficiently utilize LES but also alleviates environmental pressure. The thermodynamic analysis sheds light on the mechanism of LES leaching and FePO 4 synthesis, confirming the feasibility of each reaction. Optimal leaching conditions (1.4 times the stoichiometric amount of H 2 SO 4 , 1.5 times the amount of Fe powder, an L/S ratio of 5 mL/g, and a reaction duration of 150 min at 60 °C), under which the leaching rates of Fe and P reached 94.66% and 98.23%, respectively. Additionally, the study introduces a method to remove the main impurity Al in LES, achieving a removal rate of over 99%, reducing its concentration to below 100 ppm. Other impurities, such as Ti, Mn, and Zn, also meet the Chinese Chemical Industry Standard (HG/T 4701-2021). Comparative analyses were conducted between regenerated R-FePO 4 , commercial C–FePO 4 , and untreated LES (r-FePO 4 ). LiFePO 4 materials derived from these sources were synthesized, followed by an evaluation of their electrochemical performance. The regenerated R-FePO 4 matched the quality of commercial FePO 4 and significantly outperformed r-FePO 4 . Additionally, the process proposed in this study yields significant economic benefits, estimating a profit of 719.6 $/t of recycled LES. This research proposes a cost-effective and efficient method for regenerating high-quality battery-grade FePO 4 from LES, offering a significant contribution to the closed-loop recycling of waste LiFePO 4 batteries.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2016
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IF 3.847
Haian Xia,Siquan Xu,Xiaopei Yan,Songlin Zuo
It is of great significance to explore and develop a cost-effective and environmentally friendly way to covert cellulosic materials into 5-hydroxymethylfurfural (5-HMF). An inexpensive FePO 4 catalyst, which is insoluble at room temperature but can be partially dissolved and behaves as homogeneous catalyst at elevated temperatures, was used to directly convert cellulose into 5-HMF. The effect of various reaction conditions including reaction temperature, reaction time, cellulose concentration and catalyst amount on the conversion of cellulose and 5-HMF yield was investigated. A 5-HMF yield up to 49.5 mol% was achieved at 160 °C for 60 min with the FePO 4 catalyst, which is comparable to the highest yield of 5-HMF obtained in ionic liquid or homogeneous catalysis reaction systems. Moreover, this unique catalyst is readily separated from the aqueous solution via precipitation after cooling to room temperature since it is insoluble at room temperature. The catalyst can be used over five successive cycles although the amorphous FePO 4 underwent the structural transformation from an amorphous phase into a new crystalline form of FePO 4 , evidenced by XRD, IR, and visible Raman spectroscopic results. The soluble iron species, such as Fe 3 + species, act as Lewis acid sites catalyzing isomerization of glucose to fructose followed by the dehydration of fructose into 5-HMF catalyzed by H + ions.
研究领域:
生物质化学
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催化化学
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 81
·51281-51289
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IF 3.108
Yong Liu,Zili Li,Yaohui You,Xiaogang Zheng,Jing Wen
FePO4 catalysts with branch-like, flower-like, and spherical morphologies were synthesized for the conversion of methyl cellulose to 5-hydroxymethylfurfural (5-HMF) via a hydrothermal route. The molar ratio of Fe3+ and H2PO4− ions in the reaction system played a crucial role in the morphology of FePO4. Compared with flower-like, spherical and amorphous FePO4, branch-like FePO4 presented a better catalytic performance in the cellulose conversion and 5-HMF yield. The branch-like FePO4 retained a branch structure after recycling five times in the bi-phasic reaction process. The insolubility of low temperature and partial dissolution of elevated temperature were responsible for the excellent catalytic activity of the FePO4 phase-change catalyst. The combined effect of H+ ions and iron species generated from the hydrolysis of FePO4 can be favorable for the enhanced yield of 5-HMF.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jinglin Zhu,Jiong Wang,Chao Shan,Jing Zhang,Lu Lv,Bingcai Pan
Cobalt-mediated activation of peroxymonosulfate (PMS) is an attractive option for degradation of organic pollutants in water. How to develop durable Co-based catalysts (i.e., low Co leaching) of high activity is still a challenging task. In this study, Co-doped mesoporous FePO 4 was synthesized via a facile sol-gel method followed by calcination. Multiple characterizations indicated that the Co species were uniformly distributed within the crystal structure of FePO 4 . The resultant catalysts possessed large surface area to provide substantial active sites for the activation of PMS. The Co-doped FePO 4 with an optimized Co/Fe molar ratio of 0.1 (CoFeP-0.1) was highly effective and robust for degradation of atrazine at pH = 7 in PMS system with trivial Co leaching (52 μg/L or lower). The pseudo first-order kinetic constant of atrazine degradation was 0.225 min −1 , about 2.7 times and 23 times higher than that of Co 3 O 4 and CoFe-0.1, respectively. Both experimental study and density functional theory (DFT) calculation suggested that the excellent catalytic performance of CoFeP-0.1 was ascribed to the well dispersion of Co species in the mesoporous FePO 4 and the fast electron transfer of Co 2+ /Co 3+ redox via the charge redistribution between Fe atom and Co atom. A reasonable mechanism of CoFeP-0.1/PMS system-based catalysis was proposed where SO 4 − was primarily responsible for the degradation of atrazine.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 27
·期 1
·171-182
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IF 2.747
He Jielong,Bai Zhe,Huang Xinping,Zhang Zhengyu,Lu Lu,Li Jun
In this work, Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 was prepared by the sol–gel method and coated with FePO 4 . The experimental results show that the material surface is uniformly coated with FePO 4 . A small amount of coating will not change the layered structure of the material. Among them, the material with 5% FePO 4 coating has the best performance. The first charge and discharge specific capacity at 0.1 C current density is 324.4 mAh g −1 and 280.4 mAh g −1 , respectively. And the first coulomb efficiency is 86.4%, which is significantly higher than 75.6% of the pristine material. The improvement of the first charge–discharge performance of the coating material is due to the decrease of discharge voltage plateau and the redox of FePO 4 with electrochemical activity. When the FePO 4 coating content is 5%, the cycling performance of the material at 0.2 C current density is the best. After 100 cycles, the capacity decays from 268.4 to 232.9 mAh g −1 , and the capacity retention rate is 86.78%, which is higher than 60.58% of the pristine sample. The discharge specific capacity of 5% coated material at 5 C rate is 134.8 mAh g −1 , which is higher than 95.3 mAh g −1 of the pristine material. Graphical
研究领域:
材料科学
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电化学
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DOI
高影响因子
Materials Today Energy
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2025
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IF 8.6
Yawen Gao,Luxiang Ma,Shuaifei Zhao,Chunxi Hai,Tiandong Chen,Junyi Zhang,Yan Zhao,Yanxia Sun,Shengde Dong,Xin He,Qi Xu,Xiaowang Wu,Caixiong Quan,Hongli Su,Yuan Zhou
Cost-effective and efficient lithium extraction technology is vital to foster the growth of lithium industry. This paper proposed a novel approach for the high value utilization of spent LiFePO 4 (S-LiFePO 4 ) in the field of lithium extraction from salt lakes was proposed using spent LiFePO 4 (S-LiFePO 4 ) as raw material. The anode, made from spent LiFePO 4 , is prepared via a sintering process, while FePO 4 , obtained through chemical oxidation, is used as the cathode. Compared with commercial LiFePO 4 , this system not only reduces the cost but also greatly shortens the preparation time of FePO 4 (only about 10min is required). And the electrochemical extraction system had a favorable lithium extraction capacity (29.25 mg/g) from actual brine, reducing the Mg/Li ratio from 61.4 to 0.8. This study not only achieved the low-cost preparation of electrode materials and facilitated the large-scale implementation of this process, but also proposed a high-value comprehensive utilization strategy for lithium-ion batteries recycling.
研究领域:
材料科学
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环境工程
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能源技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jiachun Xiong,Zhongwei Zhao,Dongfu Liu,Lihua He
In this study, a novel high-efficient approach of directly extracting lithium from the Da Qaidam artificial raw brine (the main components: Li + 0.10 g·L -1 , Na + 82.34 g·L -1 ) by LiFePO 4 /FePO 4 material through the chemical redox method was proposed. The extraction process demonstrated a fast reaction speed and expected lithium adsorption capacity which reached 9.13 mg·g −1 , and the whole process could be online monitored by measuring the solution’s redox potential and pH value. Besides, the adsorption process exhibited excellent ion selectivity while the separation coefficient of lithium towards sodium , potassium , and magnesium reached 8704, 2460, and 6864 respectively. This extraction method features high efficiency, facile and continuous operation, and provides an alternative pathway to directly extract lithium from raw brines.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ACS Omega
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2021
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IF 3.512
Xiang-lan Ming,Ruizi Wang,Teng Li,Xixi Wu,Liang-jie Yuan,Yu Zhao
The micro–nano-structured FePO4·2H2O was prepared from mixed solution of FeSO4 oxidized in diluted H3PO4 with H2O2 and NaOH solution in the turbulent flow cycle state at 90 °C. The resulting products were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Constant current charge/discharge tests were adopted to investigate the electrochemical performance and the rate capability (from 0.1C to 5C) of the carbon-coated LiFePO4 composite materials prepared from the micro–nano-structured FePO4. The carbon-coated LiFePO4 composite materials deliver a high specific discharge capacity of 153.7 mAh·g–1, exhibit excellent cycle performance with 98.6% of the capacity retained after 30 cycles. This study demonstrates that the turbulent flow cycle method may be an economical and effective method for industrial production of fine and uniform micro–nano-structured FePO4·2H2O particles for LiFePO4 cathode materials for Li-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
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DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 21
·5097
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IF 4.2
Zifang Zhang,Junhua Bai,Yan Gong,Lifang Zhang
Ascorbic acid (AA) plays an important role in many physiological and biochemical processes. Adequate quantification of AA is required for controlling the intake of AA for health management. In this study, a portable probe was fabricated based on the assembled FePO4@GO nanozyme by homogeneous precipitation. FePO4@GO exhibits excellent peroxidase (POD) activity. As an efficient free radical scavenger, ascorbic acid scavenges1O2free radicals produced by hydrogen peroxide catalyzed by peroxidase enzymes and then inhibits the color reaction of 3,3′,5,5′-tetramethylbenzidine (TMB). A good linear relationship between the color of the reaction system and the concentration of AA in the range of 2.5–75 μM was presented, and the detection limit is 1.25 μM. Furthermore, a visual colorimetric detection platform was constructed using a smartphone. The AA content is accurately reflected by intelligent recognition of color changes in the reaction system. It provides an alternative approach for portable and visual rapid detection of Vitamin C (VC) in medicine. Meanwhile, it also provides a reference for the assembly of an intelligent detection platform based on nanozymes.
研究领域:
生物化学
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医学检测
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纳米材料科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）