JOURNAL OF POROUS MATERIALS
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2022
·Vol. 29
·期 5
·1399-1410
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IF 2.523
Zhang Xin,Chen Fei,Li Yuejin,Duan Yongzheng,Liu Guoxia
In this study, lanthanum-modified the shell–core magnetic nanocomposites with Fe 3 O 4 core and homogeneous mesoporous silica shell (La-SBA-15@Fe 3 O 4 -x) were prepared. The preparation, morphology, composition and magnetic properties of La-SBA-15@Fe 3 O 4 were investigated by TEM, SEM, XRD, VSM and BET. The results suggested that the SBA-15 have successfully encapsulated Fe 3 O 4 and the magnetic particles were decorated by lanthanum. The adsorption experiments were carried out to explore effect of La-SBA-15@Fe 3 O 4 on removal of phosphorus from aqueous solution. The kinetic study of adsorption process was investigated to describe the relationship between adsorption rate and adsorption equilibrium and the Langmuir and Freundlich isotherm models were employed to illustrate adsorption isotherm.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Zhihao Chen,Bingfeng Lin,Yingping Huang,Yanbiao Liu,Yonghong Wu,Rui Qu,Cilai Tang
Biochar (BC) derived from orange peels was modified using LaCl 3 to enhance its tetracycline (TC) adsorption capacity. SEM-EDS, FT-IR, XRD, and BET were used to characterize the physiochemical characteristics of La-modified biochar (La-BC). Batch experiments were conducted to investigate the effects of several variables like pyrolysis temperature, adsorbent dosage, initial pH, and coexisting ions on the adsorption of TC by La-BC. XPS and density functional theory (DFT) were used to elucidate the TC adsorption mechanism of La-BC. The results demonstrated that La was uniformly coated on the surface of the La-BC. The physiochemical characteristics of La-BC highly depended on pyrolysis temperature. Higher temperature increased the specific surface area and functional groups of La-BC, thus enhancing its TC adsorption capacity. La-BC prepared at 700 °C (BC@La-700) achieved the maximum adsorption capacity of 143.20 mg/g, which was 6.8 and 4.6 times higher than that of BC@La-500 and BC@La-600, respectively. The mechanisms of TC adsorption by La-BC were most accurately described by the pseudo-second-order kinetic model. Furthermore, the adsorption isotherm of La-BC was consistent with the Freundlich model. BC@La-700 achieved good TC adsorption efficiencies even at a wide pH range (pH 4–10). Humic acid significantly inhibited TC adsorption by La-BC. The presence of coexisting ions (NH 4 + , Ca 2+ , NO 3 − ) did not significantly affect the adsorption capacity of La-BC, particularly BC@La-700. Moreover, BC@La-700 also exhibited the best recycling performance, which achieved relative high adsorption capacity even after 5 cycles. The XPS results showed that π-π bonds, oxygen-containing functional groups, and La played a major role in the adsorption of TC on La-BC. The result of DFT showed that the adsorption energy of La-BC was the greatest than that of other functional groups on biochar. Collectively, our findings provide a theoretical basis for the development of La-BC based materials to remove TC from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Liwei Yang,Xinyuan Tian,Zhuoyue Liu,Hui Yu,Zixin Peng,Chao Hai,Xing Xu,Chuanliang Zhao
MnO 2 has a large potential for defluoridation, however, the influences of its crystal forms on the performance and mechanism of defluoridation are unknown. The research systematically investigated the defluoridation performance and mechanism of a total of eight materials with different crystal forms of MnO 2 (α, β, γ, δ) before and after lanthanum modification, separately. It was indicated that the largest Langmuir adsorption of α-MnO 2 and La-γ-MnO 2 for fluoride achieved 5.04 mg/g and 42.39 mg/g, correspondingly. The surface hydroxyl group and lanthanum loading of the material proved to be the major contributors to defluoridation. For the adsorption performance of eight materials on fluoride, pH was a significant influencing factor, with the highest adsorption performance at pH 5 ∼ 6. The eight materials showed consistent selectivity for fluoride adsorption in the existence of different anions, with the order of influence on the removal efficiency: CO 3 2– > NO 3 – > SO 4 2 – > Cl – . The studies of FTIR, XPS, and variation of solution pH further illustrated that the adsorption mechanism of the eight materials on fluoride was the ion-exchange interaction and the complexation reaction. In addition, the effect of crystal forms on the adsorption of fluoride ions was further elaborated by DFT analysis. Finally, this study provided an in-depth discussion of the parameters of the dynamic process as well as the nature of the penetration curves by applying the Thomas, Clark, and BDST models.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Haoyang Fu,Yixuan Yang,Runliang Zhu,Jing Liu,Muhammad Usman,Qingze Chen,Hongping He
Present study reports the successful development of a novel lanthanum (La)-based magnetic adsorbent and its use for phosphate removal from water. For its synthesis, natural magnetite (Mag), Fe 3 O 4 , was subjected to partial dissolution in HCl solution and the obtained suspension was mixed with an alkaline solution for in-situ synthesis of ferrihydrite (Fh)-coated Mag (Mag@Fh). Mag@Fh was then decorated with La (hydr)oxides followed by calcination to produce Fh-coated and La-decorated Mag (Mag@Fh-La). Obtained Mag@Fh-La represented high phosphate adsorption capacity (44.8 mg P/g at 15.7% La in its structure) and La usage efficiency. Moreover, Mag@Fh-La retained its high adsorption capacity (>35.0 mg P/g) over a wide range of equilibrium solution pH (3.2–10.7). The combination of FTIR , XPS analysis and adsorption experiments revealed that ligand exchange and electrostatic attraction were the main mechanisms that jointly facilitated the adsorption of phosphate. Adsorption-desorption cycle studies confirmed the well-retained adsorption efficiency of regenerated Mag@Fh-La for repeated applications. Final experiments with real domestic wastewater (initial phosphate concentration of 1.7 mg/L) revealed that 0.2 g/L Mag@Fh-La efficiently reduced the phosphate concentration to below 0.02 mg/L. Overall, this work clearly highlights that the synthesized novel adsorbent has promising applications in phosphate removal from real wastewater .
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Zhiyong Sun,Xianhua Cheng
Carbon nanotubes (CNTs) were functionalized with Lanthanum (La) modifier and appropriate acid-treatment methods. CNT-containing film was deposited on silicon substrates via a self-assembly process. The formation and microstructure of La treated CNTs and CNT-containing film were characterized by high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray photoelectron spectrometry (XPS) and water contact angle (WCA). Its tribological properties were evaluated with a UMT-2MT reciprocating friction tester. The results show that CNTs were adsorbed on silicon substrates by means of chemically bonding between La and oxygen-containing functional groups. The friction coefficient of the silicon substrates is reduced from 0.87 to 0.12 after the deposition of CNT-containing film on its surface. CNT-containing film shows excellent antiwear, friction reducing ability and load-carrying capacity due to excellent mechanical and self-lubrication properties of CNTs.
研究领域:
材料科学
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摩擦学
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表面工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Liang Li,Kai Chao,Xiaowei Liu,Siyue Zhou
A series of ultra-evenly La-decorated CoMoP composites have been fabricated by a selective corrosion and sequential in situ phosphorization strategy using La-doped Co-ZIF-67 as precursors. The electrochemical performance showed that introducing La ions within transition metal phosphides’ structure could effectively optimize the electronic configuration and result in an excellent bifunctional electrocatalyst for overall water splitting. Along with the increased La doping content to 10 %, the catalytic activities of the composites for hydrogen evolution reaction (HER), and oxygen evolution reaction (OER) all tended to increase initially and then decrease. Among all the synthesized La-decorated CoMoP materials, the 5 % La-doped composite presented the most excellent HER and OER performance in 1 M KOH. The overpotential could reach 49 mV for HER and 250 mV for OER at 10 mA·cm −2 , respectively. In addition, when employed as both anode and cathode to assemble an alkaline electrolyzer, it only required a cell voltage of 1.56 V to achieve a current density of 10 mA·cm −2 , which is superior to the most reported precious-metal-free bifunctional catalysts. More importantly, the electrolyzer could maintain a stable water-splitting current density of 10 mA·cm −2 for at least 24 h without any deviation, highlighting its potential for practical applications.
研究领域:
材料科学
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电化学
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能源催化
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DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 40
·e202302286
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IF 2.1
Yaxin Gu,Yi Fang,Huayi Cai,Shaobo Yang,Song Yan,Rongjuan Zhang,Chaochao Cao,Chengchun Tang
Graphical Novel lanthanum modified porous BN composites (BN−La−X) were successfully prepared and applied to remove fluoride contamination in aquatic environment effectively. Fluorine contamination has caused great harm to humans and the environment. In this study, novel lanthanum modified porous boron nitride (porous BN) composites (BN−La−X) were successfully prepared and applied to remove fluoride from water. The results indicated that lanthanum was present on the surface of BN in the form of amorphous La 2 O 3 . BN−La-4 has excellent adsorption performance, and its removal of fluoride is much more effective than that of porous BN with good cyclic regeneration ability. In addition, the fluoride adsorption by BN−La-4 could reach adsorption equilibrium within 2 h and the adsorption kinetics was conformed to the pseudo-second-order model. The maximum adsorption capacity of BN−La-4 was calculated from the Langmuir model to be 80.04 mg g −1 , which was better than most related adsorbents. Furthermore, the presence of anions and pH values affected the removal of fluoride. The adsorption mechanisms were consisted of electrostatic attraction, ion exchange between hydroxyl and fluorine ions, and the formation of coordination complexes between lanthanide ions and fluoride ions. In summary, La 2 O 3 modified porous boron nitride composite is a promising adsorbent for the removal of fluoride contamination in aquatic environment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Xiude Peng,Xiaohua Cao,Huaiyu Xu,Ruibin Xiong,Dedong He,Dingkai Chen,Yongming Luo
CO2-ODHP has been demonstrated to be an effective technology for the production of propylene. CO2 acts as a soft oxidizer that reduces over-oxidation of hydrocarbons and improves propylene selectivity. However, CO2-ODHP still faces the challenge of rapid catalyst deactivation due to coke accumulation at elevated operating temperatures. Herein, we prepared a La-modified Ga/ZSM-5 catalyst, in which La modified the acidic–basic properties of Ga/ZSM-5 and improved the resistance to coke accumulation of the catalyst. The synthesized Ga2La1/ZSM-5 catalyst achieved propane conversion up to 80% at 580 °C. In situ DRIFTS analysis revealed that the addition of La could significantly accelerate the formation of HCOO* intermediates, which further improved the efficiency of the CO2-ODHP reaction.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
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IF 4.561
Xuan Jing,Yaxin Wang,Li Chen,Yunyun Wang,Xinyan Yang,Yinhua Jiang,Yongsheng Yan
Nowadays, the problem of phosphorus pollution is serious, and it is extremely urgent to deal with the eutrophication of water bodies caused by phosphorus pollution. In order to promote the governance of this problem, free-standing large-mesoporous silica films were successfully prepared using cellulose nanocrystals (CNCs) as templates with evaporation-induced self-assembly (EISA) method, followed by the removal of CNCs by pickling method using sulfuric acid solution. After decoration with biocompatible lanthanum oxide, the novel phosphate adsorbents (La-MSF-x) possessed the superior adsorption performances with high phosphate adsorption capacities (up to 49.98 mg g −1 ) in experiments. The silica film possessed unique large mesopores with a pore size of approximately 21.07 nm. Moreover, the film adsorbents were used as the host to solve the dilemma of difficult recycling of the powder materials. The results of SEM, FTIR, XRD and XPS analysis of La-MSF-5-P after phosphate adsorption demonstrated that multi-adsorption mechanisms could explain the process of phosphate adsorption. And the formation of “rod-like” randomness crystal LaPO 4 precipitation was the dominant pathway in the adsorption process. Thus these lanthanum-doped large-mesoporous silica films with enhanced performance have great potential in water quality protection.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）