COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yongchao Miao,Shuming Wen,Zhenhao Guan,Qicheng Feng
In this study, the flotation tests revealed that ethylenediamine tetramethylenephosphonic acid (EDTMPA) as a calcite inhibitor has a stronger depression effect than EDTA (ethylene diamine tetraacetic acid) in the cassiterite flotation process, and the selective depression mechanism of EDTMPA was revealed by zeta potential test, TOC test, XPS analysis and DFT calculation . The flotation test results showed that effective separation of cassiterite and calcite could be achieved at pulp pH of 9.0, NaOL concentration of 1.80 × 10 −4 mol/L and EDTMPA concentration of 1.25 × 10 −5 mol/L. The selective adsorption of EDTMPA on the calcite surface was ascribed to the strong interactions between the phosphate ions in the former, and the surface Ca 2+ ions on the latter’s crystal lattice . DFT calculations also confirmed the strong affinity of EDTMPA for calcite and its weak affinity for cassiterite. The results of this study provide an experimental and theoretical background for the sustainable and eco-friendly separation of cassiterite from calcite.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Zhenxiang Pan,Bizhen Zeng,Genying Yu,Hongjun Lin,Lijiang Hu,Jiaheng Teng,Hanmin Zhang,Lining Yang
While ethylenediamine tetramethylenephosphonic acid (EDTMPA) has been emerged as a stronger chelating agent than ethylene diamine tetraacetic acid (EDTA) for fouling mitigation, and transparent exopolymer particles (TEP) is a major foulant in membrane-based water treatment process, effects of EDTMPA on TEP fouling and the underlying mechanism have been not yet studied. In this study, Flory-Huggins lattice theory was combined with density functional theory (DFT) technology to explore this subject at molecular level. Filtration experiments showed a unimodal pattern of specific filtration resistance (SFR) of TEP sample with Ca 2+ concentration in range of 0–3 mM. For the TEP sample with the peak SFR value at 1.5 mM Ca 2+ , continuous addition of EDTMPA (from 0 to 100 mg·L −1 ) resulted in a sustained decrease in SFR. Energy dispersive spectroscopy (EDS) mapping characterization showed the continuing decline of calcium content in the TEP layer with increase of EDTMPA addition, indicating that EDTMPA successfully captured Ca 2+ from alginate‑calcium ligation (TEP), and then disintegrated the TEP structure. DFT simulation showed that Ca 2+ preferentially coordinated with the terminal carboxyl groups of alginate chains to form a coordination configuration that is conducive to stretch the three-dimensional polymer network. Such a network corresponded to an extremely high SFR according to Flory-Huggins theory. EDTMPA addition caused disintegration of the coordination configuration of Ca 2+ binding to terminal carboxyl groups, which further resulted in collapse and flocculation of TEP gel network structure, thus leading to a continuous SFR decrease. This work provided deep thermodynamic insights into effects of EDTMPA on TEP-associated fouling at molecular level, facilitating to better understanding and mitigation of membrane fouling.
研究领域:
环境科学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Huali Zhang,Jiaxin Zhang,Hanjun Wu,Yi Pan,Yan Xia,Zhiquan Pan,Dongshen Wang
In this work, heterogeneous catalysts of Cu(II)-ethylenediamine tetramethylene phosphonic acid (Cu(II)-EDTMPA) complex intercalated layered double hydroxides (EDTMPA-Cu-LDH) was synthesized by co-precipitation method for visible-light photocatalytic degradation of Rhodamine B (RhB). The synthesized catalysts were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The results indicated that the EDTMPA-Cu-LDH showed a typical layered structure. After intercalation, layer spacing increased from 7.96 to 12.21 Å. The catalysts showed excellent catalytic activity for the degradation of RhB in visible light. The optimum conditions for RhB degradation were confirmed to be natural initial pH value 5.85, 10 mmol L –1 of RhB concentration, 7 mmol L –1 of H 2 O 2 concentration, and 0.3 g L –1 of catalyst dosage. The maximum degradation efficiency was 98.2% under the optimum conditions and excellent reusability and stability were obtained in the regeneration test. In the end, the reaction mechanism that might exist in the heterogeneous UV-Fenton system was proposed.
研究领域:
环境科学
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催化
·
材料科学
·
光催化
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无机化学
·
分析化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 45
·68320-68331
·
IF 5.19
Luo Qie,Cui Wenzheng,Wang Huan,Xiao Bo,Chen Lei,Wang Youqun,Zhang Zhibin,Liu Yunhai,Cao Xiaohong
The separation of magnetic adsorbents from aqueous solutions is made simple by using an external magnetic field. Herein, magnetic Zr(IV)-ethylenediamine tetramethylene phosphonic acid (EDTMPA) hybrids (MZrOP- x -T, x , and T were the different quality of Fe 3 O 4 @C and temperature in the synthesis process, respectively). A study was conducted on the uses of MZrOP- x -T in the capture of U(VI). The influences of pH, adsorption period, initial concentration, and temperature were all investigated. Furthermore, the desorption and reusability of the materials were explored. The optimal values of x and T were 0.2 g and 100 °C, respectively. At 298.15 K, the maximum adsorption capacity of MZrOP-0.2-100 was 330.30 mg·g −1 . The current research demonstrates that MZrOP-0.2-100 is a potentially effective material in removing U(VI) from radioactive solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
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IF 7.015
Chun Ding,Xuan Zhang,Shu Xiong,Liang Shen,Ming Yi,Boyang Liu,Yan Wang
In this study, an organophosphonate scale inhibitor, ethylenediamine tetra(methylenephosphonic acid) sodium salt (EDTMPA-Na) draw solution, was adopted for alleviating the membrane fouling in the forward osmosis (FO) application of produced water treatment. Compared with the typical NaCl draw solution, the employment of EDTMPA-Na draw solution can alleviate the membrane fouling effectively and therefore achieve a higher water recovery rate (60.6%) after a continuous 48-h test. And the mechanism of membrane fouling control with EDTMPA-Na draw solution has been systemically explored by varying the feed or draw solution compositions. The results turn out that the leakage of EDTMPA-Na draw solute to the feed solution can alleviate the formation of gypsum scales on the membrane surface effectively, ascribed to its excellent scale inhibition ability and the unique diffusion route of the draw solute (resulting in a relative higher concentration of EDTMPA-Na near the membrane surface) in FO process. And the alleviation of membrane scaling can further mitigate the accumulation of organic foulant on the FO membrane . This study may provide an efficient strategy for alleviating the membrane fouling in the FO application of produced water treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Xiaoqing Qiu,Xule Wan,Zichun Wang,Zhiwei Li,Juan Li,Xiaohong Li,Zhijun Zhang
Inorganic-organic nanocomposites present excellent comprehensive performance due to the combination of the advantages of inorganic, organic, and nanotechnology. However, the preparation methods are usually complex and inefficient, especially not universal. Here, a simple and universal strategy was designed for preparing silica-based nanocomposite flame retardants . Mesoporous silica (m-SiO 2 ) was used to load ethylenediamine tetra(methylene phosphonic acid) (EDTMPA). Above the melting point of EDTMPA, molten EDTMPA enters into the mesoporous channels of m-SiO 2 by means of capillary force . After cooling, EDTMPA is fixed in the mesoporous cavity to form a flame retardant nanostructure containing silicon , phosphorus, and nitrogen (SiP). The whole process of mesoporous silica-loaded organic flame retardant is simple and green. Adding 3 phr SiP2 into epoxy (EP) resin can reduce the peak heat release rate , total smoke production, and peak CO production by 44.3%, 30.4%, and 45.5%, respectively. Besides, it shows good mechanical properties compared with the EP composites with physically blended m-SiO 2 and EDTMPA. These excellent performances are attributed to the combined effect of EDTMPA and m-SiO 2 as well as the nanoscale effect . This strategy provides a simple, efficient, and general method to prepare nanocomposites by loading molten organic compounds into m-SiO 2 .
研究领域:
材料科学
·
化学工程
✓ 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）