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THERMOCHIMICA ACTA · 2017 · IF 2.236

A new evidence for the interaction between the two components in PANI/La composites

Siyu Wang,Yini Li,Jie Wang,Shaoxu Wang,Quan Shi,Zhicheng Tan

We found a new way to prove the interaction between the two components in polyaniline (PANI-DTA)/La composites by studying the specific heat. It is firstly found that PANI-DTA has a phase transition peak at −50 °C. The composites (PLa) have no phase transition at −50 °C, so the thermal, magnetic and electrochemical properties are different from PANI-DTA. The heat capacities of the composites are higher than that of PANI-DTA and La complex. the magnetic field dependence of magnetization (M–H) curves of PANI-DTA and PLa-2 exhibit saturation magnetization and a hysteresis loop. The electrochemical performance of the composites are greatly improved compared with PANI-DTA and La complex.

CAS / MDL: 10277-43-7

研究领域: 材料科学 · 复合材料 · 热力学 · 电化学 · 磁学

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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS · 2019 · IF 3.131

Recyclable high-affinity arsenate sorbents based on porous Fe2O3/La2O2CO3 composites derived from Fe-La-C frameworks

Jiang-Bo Huo,Kiran Gupta,Changyong Lu,Hans Chr. Bruun Hansen,Ming-Lai Fu

Efficient removal of aqueous arsenic is still a great challenge in particular for producing clean drinking water and for waste water treatment. To this end, a novel magnetic porous Fe-La composite, comprising La 2 O 2 CO 3 and Fe 2 O 3 , was fabricated via a self-sacrificing template method based on bimetallic (Fe, La)-MOFs calcined at 550 °C. Batch adsorption results demonstrated that Fe-LaXY (X and Y represent the feeding mole ratio of Fe and La precursors) exhibited a maximum adsorption capacity of As(V) (241, 251 and 410 mg g −1 for Fe-La51, Fe-La21 and Fe-La11, respectively), and they also showed satisfactory adsorption kinetics, which can be ascribed to a strong coordination between La and arsenate species. Coexisting sorbates including carbonate, silicate, sulfate, and humic acid had a slight influence on adsorption performance of arsenate, while phosphate isostructural to arsenate gave severe interference. More importantly, the Fe-La11 could be easily separated from water due to its magnetism (7.0 emu g −1 ), and it also exhibited excellent recyclability (above 80% of removal efficiency at the fifth cycle) as well as stability in terms of release of Fe and La ions (< 0.5 mg L −1 at pH 4.0–10.0). Based on results from X-ray photoelectron spectroscopy (XPS), Powder X-ray diffraction (PXRD) and Raman spectroscopy, it is demonstrated that ligand exchange of surface hydroxyl groups and the formation of inner-sphere surface complexes are main responsible for the As(V) removal mechanism. Combining the magnetic properties, the absorption properties and the recyclability make Fe-LaXY derived from bimetallic MOFs promising sorbents for arsenate removal.

CAS / MDL: 68-12-2 10025-77-1 10277-43-7 100-21-0

研究领域: 环境科学 · 材料科学

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A new evidence for the interaction between the two components in PANI/La composites

Recyclable high-affinity arsenate sorbents based on porous Fe2O3/La2O2CO3 composites derived from Fe-La-C frameworks