Asia-Pacific Journal of Chemical Engineering
·
2012
·Vol. 7
·期 6
·940-947
·
IF 0.758
Jianxian Zeng,Qincheng He,Hu Zhou,Xiahui Sun,Jiaojiao Zhang
Complexation–ultrafiltration process was investigated for cerium(III) recovery from aqueous solutions by using poly (acrylic acid) sodium salt (PAASS) as a complexing agent. The adsorption of cerium(III) on PAASS was preliminarily studied at different pH values. Next, effects of pH, polymer metal ratio (PMR), calcium(II) and competitive complexing agents on permeate flux ( J ) and cerium rejection coefficient ( R ) were investigated in the total recirculation mode. Finally, the integrations of four experiments including concentration, decomplexation, regeneration of PAASS and reuse of regenerated PAASS were carried out. Obtained results show that the adsorption can be described well using the Langmuir equation. If pH is reduced below 4, J decreases rapidly. PMR has negligible effect on J . R increases with increasing pH or PMR. Calcium(II) and ethylenediaminetetraacetic acid disodium salt have the effects on R , but these effects can decrease by increasing pH. Tartrate sodium does not influence R . In the process of concentration, J declines slowly, and R is about 1. It takes 40 min to reach the decomplexation equilibrium at pH 3. The decomplexation percentage of cerium(III)–PAASS complex is about 70%. In the regeneration of PAASS, cerium(III) can be removed effectively, and the purification of regenerated PAASS is acceptably satisfactory. The binding capacity of regenerated PAASS is close to that of fresh PAASS, and the recovery percentage of binding capacity is higher than 90%. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Yu Xie,Shuhan Peng,Yong Feng,Deli Wu
The degradation of carboxylic acid has been identified as one of the rate-determining steps in the mineralization of organic pollutants by ozonation . In this study, Ce(III)-doped graphitic carbon nitride (Ce–CN) composites with different Ce(III) contents were synthesized and used as catalysts for the ozonation of oxalate. The morphology and structure of the Ce–CN were comprehensively characterized using various techniques such as SEM, XRD , FTIR , and XPS. The results show that the structure of g-C 3 N 4 provided an ideal site for the accommodation of Ce(III) and thus facilitated the formation of surface hydroxyl groups. With 2.5%Ce–CN as a catalyst, the degradation efficiency of oxalate was increased by 47.1% after reaction for 30 min. The decomposition of ozone was accelerated in the presence of Ce–CN. Hydroxyl radicals were recorded by electron spin resonance and identified as the major actives species. Under the catalysis of 2.5%Ce–CN, the production of hydroxyl radicals was increased by 40%. The Ce(III) and surface hydroxyl groups that distributed uniformly on the surface of Ce–CN were speculated as the dual catalytic sites for the complexation of oxalate and activation of ozone, respectively. Ce–CN had a high stability and reutilization capability. It is proposed that a complex was formed between surface Ce(III) and oxalate, and this complex could be more easily attacked by the surrounding ozone and hydroxyl radicals than free oxalate. As oxalate is a typical recalcitrant carboxylic acid, the findings from this study are expected to promote the application of ozonation in the removal of organic pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Lei Tan,Zengjin Fu,Jing Wang,Wenyue Jiao,Tianwen Huang,Yan Hao,Yicheng Wang,Tingrui Lin
In this paper, poly(sodium styrene sulfonate) (PSS) hydrogel was synthesized following a one-step free-radical polymerization with N, N -methylene-bis-acrylamide (MBA) as a cross-linker. La(III) and Ce(III) were effectively removed from acidic aqueous solutions by using PSS hydrogel. FTIR, TGA, XRD, SEM, zeta potential analysis, and XPS were used to characterize the morphology and microstructure of PSS hydrogel. By varying pH, adsorbent dose, contact time, initial La(III) and Ce(III) ions concentrations, and interfering ions, the adsorption behavior of La(III) and Ce(III) ions on PSS hydrogel was studied. According to the experimental data, PSS hydrogel exhibited adsorption capacities above 200 mg·g −1 for La(III) and 180 mg·g −1 for Ce(III) over a wide pH range. Furthermore, adsorption data was simulated using pseudo-first order, pseudo-second order and intra-particle diffusion kinetic equations. For the description of adsorption equilibrium, Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isothermal models were used. According to the results, the Langmuir isotherm equation provided the best fit. Based on the Langmuir isotherm equation, the maximum absorption capacities of La(III) and Ce(III) by PSS hydrogel was 241.0 and 223.7 mg·g −1 , respectively. According to FTIR and XPS analysis, sulfonic acid groups were involved in the adsorption of La(III) and Ce(III) ions. And ion exchange and complexation were the main mechanisms involved. Finally, reusability tests reveal that the PSS hydrogel can be reused 13 times without losing effectiveness.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tao Zhang,Sujie Shan,Dongqing Liu,Yu Han,Kai Sun,Wei Wang
Under the double pressure of eutrophication and phosphorus deficiency, there is an urgent need to remove excess phosphate from wastewater efficiently. Preparing cerium-based materials with excellent application potential inevitably leads to Ce(III) oxidation to Ce(IV), which reduces the phosphate adsorption effect and restricts its development. To solve this problem, we introduced a protective agent and successfully synthesised cerium-modified activated carbon sorbent containing 100 % Ce(III) during the synthesis process. Compared with CeAC without a protecting agent, CeAC-A contained more Ce(III) (100 %) and exchange groups (–OH accounted for 82.76 %), achieving an adsorption capacity of up to 448.57 mg-P/g Ce, improving of 4.3 times. At the same time, the size of the cerium active component was reduced from the micron level to the nanometer level, and the mass transfer rate was significantly improved. In addition, with the enormous specific surface area and well-developed pore structure of activated carbon, it showed high dispersibility, with P/Ce molar ratio as high as 2.03, which is 1.1–4.8 times higher than other cerium-based adsorbents. Phosphate was removed primarily through electrostatic attraction and ligand exchange. In treating municipal wastewater with complex water quality, CeAC-A showed strong selectivity, a wide range of adaptability and easy repeat regeneration, making it a promising adsorbent for phosphate uptake from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hui Zhao,Haoyu Yao,Feifei Zhao,Liangrong Yang,Lianying Wu,Xiangfeng Liang,Huizhou Liu,Changjiang Yu
Efficient separation of rare earth elements (REEs) from leaching tailings is necessary for environmental protection and full utilization of resources. Cell walls are rich in various active groups that can efficiently adsorb REEs. In this work, a series of composite aerogels based on pectin and cellulose (the key active components in cell walls) were fabricated for effective adsorption of Ce (III) from leaching tailings. Physical and chemical properties of composite aerogels were characterized by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), contact angle measuring, and a zeta potentiometer. Adsorption capacity was measured under different conditions. Adsorption corresponded to the Langmuir model and the maximum adsorption capacity of Ce (III) was 337.36 mg/g. Kinetic fitting showed that the adsorption process corresponds to the second-order kinetic model. Composite aerogels have excellent regeneration performance. The adsorption process occurred by electrostatic interaction, ion exchange with –COO − , and chelation with C-NH 2 . Adsorption in a sample of leaching tailings showed that the adsorption efficiency of composite aerogels for Ce (III) and Eu (III) reached 68% and 81%, respectively, demonstrating good practicability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2023
·
IF 5
Jingxuan Lu,Jingwen Luo,Jie Li,Shiyan Fu,Yonghong Ran,Juan Li,Yazhen Zhao,Yuhui Hao
Radiation-induced pulmonary fibrosis (RIPF) is a common adverse effect of thoracic radiation therapy. Although pirfenidone is approved for treating pulmonary fibrosis, its utility is limited by its short half-life and ability to scavenge reactive oxygen species (ROS). Thus, a nanoscale complexes of cerium(III), 10-carboxyl-pirfenidone, and 1,10-phenanthroline (NPs Ce(phen)Pirf 3 ) was developed to prevent RIPF in a mouse model. NPs Ce(phen)Pirf 3 was successfully prepared using a simple moderate solvothermal method and characterized using FTIR , electrospray ionization MS , 1H nuclear magnetic NMR, and transmission electron microscopy . The cerium(III) nanocomplexes exhibited a near-spherical shape and dissolved in water with a diameter of ∼125.2 nm , as characterized by dynamic light scattering . Compared with pirfenidone, NPs Ce(phen)Pirf 3 with blue fluorescence exhibited prolonged retention times with thoracic-specific accumulation in vivo. Mice received 15 Gy gamma-ray treatment on the thorax with or without NPs Ce(phen)Pirf 3 or pirfenidone administration. NPs Ce(phen)Pirf 3 improved lung function, alleviated radiation-induced pathological changes in the lung tissues, and reduced collagen deposition 16 weeks after radiation. Our results from in vivo and in vitro experiments demonstrated that NPs Ce(phen)Pirf 3 increased the ROS-scavenging ability. Additionally, NPs Ce(phen)Pirf 3 regulated epithelial-mesenchymal transition (EMT)-related proteins, including up-regulate E-cadherin and down-regulate N-cadherin, α-SMA, and TGF-β1 in RLE-6TN cells, which suggested NPs Ce(phen)Pirf 3 may alleviate RIPF by inhibiting EMT. Finally, NPs Ce(phen)Pirf 3 also inhibited the growth of thoracic tumor cells in mice. NPs Ce(phen)Pirf 3 had a protective role against RIPF and antitumor effects, suggesting that they are a promising therapy for thoracic radiation-induced RIPF.
研究领域:
放射肿瘤学
·
药学
·
材料科学
·
分子生物学
·
病理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Pakapa Thiangpak,Aphichart Rodchanarowan
The shape-memory epoxy (SME) mixed with 10 wt % polycaprolactone (PCL) microspheres containing 5% cerium(III) nitrate (Ce(NO3)3) (PCL5Ce) was coated on an aluminum plate 2024-T3 to investigate the self-healing property. The coating was scratched and heated at 80 °C for 30 min to activate the self-healing mechanism and compare with a nonscratched coating. Surface morphology was investigated by scanning electron microscopy. The scratch was completely healed by the PCL5Ce via a thermally assisted self-healing process. Based on electrochemical impedance spectroscopy, the postheated scratched coating had shown impedance values close to the nonscratched coating, which indicated that corrosion resistivity was restored. Ce(NO3)3 content at the scratched area was analyzed by focused ion beam–scanning electron microscopy. The scratch width was healed and filled with Ce(NO3)3. Therefore, PCL5Ce is capable of being used as an enhancing additive for the self-healing performance in SME coating.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yunfei Hu,Xiangkang Cao,Xiaoze Ma,Jinglong Pan,Guangyi Cai,Xinxin Zhang,Zehua Dong
Recently, anti-corrosion coatings with auto-inhibition and self-reporting on their premature flaws are becoming more and more attractive. In this work, we engineered a cerium nitrate/8-hydroxyquinoline (Ce-HQ) hybrid pigment to endow epoxy coatings with corrosion self-inhibiting and fluorescent self-reporting performances via molecule design. The Ce-HQ pigments were synthesized by physical mixture and then dispersed into the commercial epoxy coating. Once the epoxy coating gets degraded, the underneath aluminum alloy matrix may corrode to produce Al 3+ ions, which can compete with Ce 3+ ions in the Ce-HQ complex, and then chelate with dissociative 8-HQ to form fluorescent Al-HQ complex, due to the higher bonding strength of Al 3+ with 8-HQ than Ce 3+ ions. Thus, not only the responsive releasing of Ce 3+ ions and 8-HQ can inhibit the underlying Al alloy, but the newly formed Al-HQ complex could indicate the location and severity of coating flaws through fluorescent emission under UV light. Electrochemical impedance evidenced that the composite epoxy coating containing 1 % mass Ce-HQ presents high corrosion resistance even after 504 h of salt spray test, showing 90 % corrosion refraining efficiency. This work may enlighten an approach to developing self-healing and self-diagnosis coating for premature corroded Al alloy beneath coatings via reactive release and fluorescent visualization.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Tingliang Xie,Minxuan Chen,Cong Xu,Jing Chen
Microextractors are known to provide high mass transfer rates for the extraction and separation of rare-earth elements (REEs). High-throughput microextractors are essential for industrial-scale production of REEs, but few practical studies have been conducted to date. In this work, a chaotic advection microextractor, i.e., a three-stage microextractor, was designed and demonstrated to extract Pr(III) and Ce(III) efficiently from nitric acid media at high throughputs by using 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) and sulfonated kerosene as an extraction agent and a diluent, respectively. Flow visualization experiments showed that the dispersed phase could be effectively broken into small droplets owing to vortex and recirculation flows. Microextraction experiments performed under optimal extraction conditions indicated that at low throughputs, the concentration ratio D , extraction efficiency E , and separation factor β decreased with an increase in the throughput, whereas at high throughputs, D , E , and β increased with an increase in the throughput. An extraction efficiency close to that of co-current balanced extraction was successfully achieved, even at a high total throughput of 100 mL/min and a rather short residence time of 0.029 s. Thus, the chaotic advection microextractor features a high throughput and high extraction efficiency, which are appropriate for the high-efficiency extraction and separation of REEs.
研究领域:
化学工程
·
分离科学
·
稀土冶金
·
微流控技术
·
过程强化
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Jin Chen,Huiping Bai,Zixuan Li,Jieren Xia,Qiue Cao
For the aim to detect Ce(III) in food with selectivity, sensitivity and speediness, a electrochemical sensor (Ce(III)-IIM/PC/GCE) was constructed by electropolymerization of a poly-catechol (PC) film on glassy carbon electrode (GCE) followed by modifying a Ce(III) ion-imprinted membrane (IIM) formed with electropolymerization using o -phenylenediamine as monomer . After that, a differential pulse adsorptive stripping voltammetry (DPASV) was developed for determination of Ce(III) by the obtained sensor. Under the optimal conditions, the sensor possesses good reproducibility and storage stability. Furthermore, it can be used directly for determination of Ce(III) in the concentration range of 3.0 × 10 − 12 –1.0 × 10 − 4 mol L − 1 with the limit of detection of 1.0 × 10 − 12 mol L − 1 . Since over 50-fold excess concentration of Fe 3 + , Cu 2 + and Ni 2 + will produce some interferences in the direct determination of Ce(III), an extraction method was adopted when it be used in food. After extraction of the samples with 1-phenyl-3-methyl-4-benzoyl-5-benzopyrazolone (PMBP), Ce(III) can be determined by Ce(III)-IIM/PC/GCE in the presence of > 500-fold excess concentration of Fe 3 + , Cu 2 + and Ni 2 + with the limit of detection of 4.7 × 10 − 9 mol L − 1 . The sensor was successfully applied to determine cerium in food after extracted by PMBP with a relative standard deviation (RSD) of < 3.3% (n = 4) and recoveries in the range of 94.9–102.2%.
研究领域:
分析化学
·
食品安全
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jiaojie He,Qingwang Cai,Ziyi Kang,Jingxin Zhang,Jiaqi Shen,Yuxin Gu,Zhiquan Liu,Tinglin Huang
This study compared the coagulation performance, floc characteristics, and algal cell integrity between cerium-based coagulants and polyaluminum chloride (PAC). Under optimal dosage (6 mg Ce/L), both CAN (Ce(IV)-based) and CCl (Ce(III)-based) exhibited comparable algal removal efficiency to PAC (>90 %), while generating larger flocs (>1200 µm) that settled rapidly (90 % within 5 min). However, CAN caused significant algal cell lysis during floc aging, whereas CCl exhibited minimal cell damage. Analysis of CCl flocs revealed a distinct increase in the Ce(IV) concentration post-coagulation, accompanied by pronounced phosphate and carboxyl peaks on the floc surface. Further investigation into the extracellular polymeric substances (EPS) during algal coagulation proved that the coagulation mechanism of CCl proceeded in two steps: 1) Anchoring of the coagulant onto the algal surface via strong adsorption of phosphate and carboxyl groups; 2) Synergistic interactions between algae and EPS, which induced partial oxidation of Ce(III) to Ce(IV), triggering in-situ hydrolysis of Ce(IV). This process generated large floc structures and the subsequent coagulation targeted to algae. This study highlights CCl as an eco-friendly and effective alternative with high algal removal and low toxicity (attributed to reduced Ce(IV) dosage), offering practical advantages for water treatment applications.
研究领域:
环境科学
·
水处理技术
·
胶体与界面化学
·
生态毒理学
·
给排水工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fundamental Research
·
2025
·
IF 6.3
Jiance Jin,Kai Han,Yuzhen Wang,Maxim S. Molokeev,Liang Li,Zhiguo Xia
Trivalent lanthanide Ce(III) with a typical allowed 4f – 5d transition generally exhibits short decay time in a nanosecond level, beneficial to fast X-ray imaging applications. Herein, we rationally design and synthesize two zero-dimensional Ce 3+ based halide hybrids, namely [Emim] 3 CeBr 6 and [Emmim] 3 CeBr 6 (Emim = 1-ethyl-3-methylimidazolium; Emmim = 1-ethyl-2,3-dimethylimidazolium), both exhibiting intense broad-band violet-to-blue emission originated from Ce 3+ with near-unity photoluminescence quantum yield. The short nanosecond decay time and the heavy atom effect further inspire us to explore their X-ray scintillation performance. Up to 48000 ph MeV -1 light yield is derived together with the low detection limit (around 626 nGy s -1 ), and thus a composite film is fabricated to achieve dynamic fast X-ray imaging. This study enlarges the family of scintillators in Ce(III)-based halide hybrid with short decay time.
研究领域:
材料科学
·
光学
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）