JOURNAL OF MEMBRANE SCIENCE
·
2019
·
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
WATER RESEARCH
·
2023
·
IF 12.8
Chenhao Ni,Ningyi Chen,Jiahui He,Meilan Pan,Xianhua Wang,Bingjun Pan
Organic phosphonates have been widely used in various industries and are ubiquitous in wastewaters, and efficient removal of phosphonates is still a challenge for the conventional processes because of the severe interferences from the complex water constitutions. Herein, an Nd-based nanocomposite (HNdO@PsAX) was fabricated by immobilizing hydrated neodymium oxide (HNdO) nanoparticles inside a polystyrene anion exchanger (PsAX) to remove phosphonates from high-salinity aqueous media. Batch experiments demonstrated that HNdO@PsAX had an excellent adsorption capacity (∼90.5 mg P/g-Nd) towards a typical phosphonate (1-hydrox-yethylidene-1,1-diphosphonic acid, HEDP) from the background of 8 g/L NaCl, whereas negligible HEDP adsorption was achieved by PsAX. Attractively, various coexisting substances (humic acid, phosphate, citrate, EDTA, metal ligands, and anions) exerted negligible effects on the HEDP adsorption by HNdO@PsAX under high salinity. FT-IR and XPS analyses revealed that the inner-sphere complexation between HEDP and the immobilized HNdO nanoparticles is responsible for HEDP adsorption. Fixed-bed experiments further verified that HNdO@PsAX was capable of successively treating more than 4500 bed volumes (BV) of a synthetic high-salinity wastewater (1.0 mg P/L of HEDP), whereas only ∼2 BV of effective treatment capacity was received by PsAX. The exhausted HNdO@PsAX was amenable to a complete regeneration by a binary NaOH NaCl solution without significant loss in capacity. The capability in removing other organic phosphonates and treating a real electroplating wastewater by HNdO@PsAX was further validated. Generally, HNdO@PsAX exhibited a great potential in efficiently removing phosphonates from high-salinity wastewater.
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
·
2024
·
IF 8.4
Taipu Chen,Lei Chen,Yutong Zhao,Jinkai Hao,Zhigang Shao
To tackle the challenges of phosphoric acid (PA) leakage and suboptimal proton transfer efficiency in PA-polybenzimidazole (PBI) high-temperature proton exchange membranes (HTPEMs), this research has pioneered the development of a novel porous silicon material, DP/S15, which has been tailored through organic phosphonic acid modification. S15 or DP/S15 was utilized to fabricate PBI composite membranes and subjected these membranes to a thorough examination of their properties. The integration of DP/S15 into the membrane matrix notably enhanced acid uptake and facilitated the formation of a robust and extensive proton transportation network. This was largely attributable to the synergistic interaction between the organic phosphonic acid groups in DP/S15 and PA. As a result, the membranes incorporating DP/S15 exhibited a host of commendable properties, most notably their substantial mechanical strength , which registered at 89.80 MPa with undoped PA and 13.10 MPa with doped PA. Furthermore, theoretical analyses lent credence to the efficient adsorption between DP/S15 and phosphoric acid. Consequently, the composite membranes delivered superior performance metrics, evident in their high conductivity (reaching 57.7 mS cm −1 at 160 °C) and excellent PA retention capabilities (up to 89.5 %). Of paramount significance was the performance of the single fuel cell equipped with the PA-DP/S15-PBI composite membrane, which achieved a peak power density of 672.29 mW cm −2 . This figure impressively surpassed that of the pure PBI membrane by 262.23 mW cm −2 . In light of these promising outcomes, the PA-DP/S15-PBI composite membrane harbors significant potential for deployment in HT-PEMFCs.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xuan Zhang,Xi Du,Yan Ke,Yu-Gao Zhang,Zhi-Kang Xu
Loose nanofiltration membranes (LNMs) have attracted increased attention in the field of sustainable management of the highly-saline textile wastewater. Remained challenges include achieving efficient dye/salt fractionation and alleviating high fouling propensity. Herein, functionalized-LNMs (F-LNMs) are developed by the co-deposition of polyethylenimine and tannic acid, followed by the assembly of ferric ions (Fe(III)) and organophosphonic acid (OPa) for antifouling surface construction. Plentiful OPa groups are immobilized onto the membrane surface via the high surface binding affinity and the strong coordination bonding of Fe(III) as ‘bridge’ linkers. The superior hydrophilicity and large steric hindrance of these OPa groups endow the F-LNMs with notably improved antifouling property against organic dye clusters. The optimized F-LNMs show significantly increased membrane permeance (10–30 L m −2 h −1 ·bar −1 ) in treating those simulated dye/salt aqueous solutions containing 1.0 g L −1 dye and 80.0 g L −1 Na 2 SO 4 . They also exhibit high salt permeation (>94%) and acceptable dye rejection (overall >93%) of Congo red, methyl blue and three hydrolyzed reactive dyes. Furthermore, the direct reuse of Na 2 SO 4 from the actual dyeing effluent is achieved by combining membrane separation and activated carbon adsorption, revealing the promising application prospects of F-LNMs in managing highly-saline textile wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
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2015
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IF 1.933
Junlian Wang,Guang Chen,Shengming Xu,Linyan Li
The extraction and separation of heavy rare earths is always one of the most challenging unit operations in hydrometallurgy . Research and development of novel efficient extractant is one way to solve this problem. Organophosphinic acid is a good potential extractant. A new method was established for the synthesis of nonsymmetric dialkylphosphinic acid (NSDAPA) (R′R″POOH, R′ ≠ R″), optimized the synthesizing conditions of the key intermediate mono-alkylphosphinic acid and successfully synthesized three novel extractants ( n -octyl)(2,4,4′-trimethylpentyl) phosphinic acid, ( n -octyl)(cyclohexyl)phosphinic acid and (2,3-dimethylbutyl) (2,4,4′-trimethylpentyl)phosphinic acid. The extraction ability of the novel extractants was investigated. The structure–property relationship and the separation performance for heavy rare earth couples Er/Y, Y/Ho, Yb/Tm and Lu/Yb were evaluated.
研究领域:
冶金学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
·
IF 7.664
Qiang Chen,Zhengzhou Wang
With the rapid development of fifth-generation (5G) communication, the polymeric films with satisfactory flame retardancy and high thermal conductivity have become one of the hot topics in academic research and commercial applications. Herein, novel copper ethylene diaminetetrakis-(methylene phosphonate) functionalizing boron nitride nanosheet (Cu-EDTMP@BNNNS) was prepared by in-situ self-assembly method for reduction in the fire hazards of poly (vinyl alcohol) (PVA) film, as well as the improvement on its thermal conductive and mechanical performances. The good dispersion of 1Cu-EDTMP@1BNNNS in PVA matrix results in a 41-fold enhancement in thermal conductivity (8.4 W m −1 K −1 ) of the 1Cu-EDTMP@1BNNNS/PVA composite film compared to pure PVA film. In addition, the peak heat release rate and total heat release of the PVA composite film are 87.0% and 84.3%, respectively lower than the ones of pure PVA film. Moreover, the as-prepared composite film also possesses good flexibility, and high tensile strength (116 MPa).
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
C-Journal of Carbon Research
·
2024
·Vol. 10
·期 1
·12
·
IF 3.9
Chengwei Zhou,Fan Wu,Yonggong Tang,Boyuan Chai,Jiaxin Liang,Jiangang Han,Weinan Xing,Yudong Huang,Guangyu Wu
Photocatalytic carbon dioxide conversion is a promising method for generating carbon fuels, in which the most important thing is to adjust the catalyst material to improve the photocatalytic efficiency and selectivity to conversion products, but it is still very challenging. In order to enhance the efficiency of CO2photoreduction, it is important to develop an appropriate photocatalyst. The present study focuses on developing a simple and effective hydrothermal reaction treatment to improve the catalytic efficiency of transition metal cobalt (Co) and organophosphonates. Photoexcited charge carriers are separated and transferred efficiently during this treatment, which enhances CO2chemisorption. Under visible light exposure, the best performing catalyst, CoP-4, showed 2.4 times higher activity than Co3O4(19.90 μmol h−1g−1) for reducing CO2into CO, with rates up to 47.16 μmol h−1g−1. This approach provides a viable route to enhancing the efficiency of CO2photoreduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2025
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IF 2.9
Shengzong Lan,Liuyang Dong,Tianfu Zhang,Peilun Shen,Dianwen Liu,Zhengchang Shen
In this research, 2-hydroxy phosphonyl acetic acid (HPAA) was employed as an environmentally friendly inhibitor to facilitate the flotation separation of apatite from dolomite. The results of the microflotation test indicated that 15 mg/L HPAA reduced the recovery of dolomite from 82.55% to 21.07%, while the recovery of apatite remained at 79.81%. The flotation test of artificial mixed ore showed that after adding HPAA, the grade of P2O5 in the mixed concentrate increased from 19.96% to 26.67%, and the recovery reached 75.88%. Adding Na3PO4·12H2O to the slurry effectively mitigated the influence of interfering ions on the flotation separation of apatite from dolomite. The scanning results of atomic force microscopy showed that the adsorption density and adsorption height of HPAA on the surface of dolomite were both stronger than those on the surface of apatite. The results of X-ray photoelectron spectroscopy showed that HPAA reacted with the Ca and Mg sites on the surface of dolomite. Time-of-flight secondary ion mass spectrometry detected characteristic ion fragments of C2O6PCaMg+ on the surface of dolomite treated with HPAA, and the ion fragment intensifications of C2O6PCaH+ and C2O6PMgH+ were significantly enhanced. The calculation results of density functional theory showed that the configuration of HPAA is the most stable when it simultaneously adsorbs Ca and Mg ion sites on the surface of dolomite. There is electron transfer between O in the HPAA structure and Ca and Mg ions on the mineral surface, indicating that a chemical reaction has occurred between them. This research provides a theoretical basis for the design and development of green flotation inhibitors for phosphate rock.
研究领域:
矿物加工
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表面化学
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环境化学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Chuanshen Wang,Hongliang Ding,Lu Liu,Hongfei He,Bicheng Lin,Na Sun,Keqing Zhou,Wei Wang,Yuan Hu,Bin Yu
Polymer materials pose significant fire hazards, including rapid heat release and the emission of toxic smoke. Herein, we report a flame-retardant thermoplastic polyurethane (TPU) composite engineered with organophosphonic acid-intercalated high-entropy layered double hydroxides (HE-LDHs), achieving synergistic flame retardancy, smoke suppression, and mechanical enhancement. Meanwhile, tensile strength was enhanced to 38 MPa. The NiCoFeAlZn/DPA/TPU system demonstrated 42.1% reduction in peak heat release rate (pHRR), 48.5% decrease in total smoke release (TSR), and 36.4% decrease in CO production rate compared to pure TPU, attributed to a hierarchical flame-retardant mechanism involving gas-phase dilution, physical barrier formation, and catalytic charring. The synergistic effect of multi-metal components of HE-LDHs and the intercalation (diphenylphosphoric acid, phenylphosphinic acid) agents restructured the thermal decomposition pathway of the material. Early-stage fire warning through HE-LDHs decomposition of interlayer water and organic acid anions releases CO 2 /H 2 O to dilute flammable gases; Intermediate flame inhibition through HE-LDHs catalyze dehydrogenation crosslinking of TPU, capture by PO· radicals from phosphonates, effectively suppressing flame propagation; High-temperature protection through collapse of LDH layers generates metal oxides and phosphorus-carbon hybrid barriers, triggering endothermic phase transitions, with an increase in the amount of residual carbon. This work establishes a theoretical framework for regulating the structure-property relationship of HE-LDHs and pioneers an integrated, active-passive design for fire-safe, high-risk polymer applications.
研究领域:
高分子科学
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材料工程
·
消防安全工程
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纳米复合材料
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Wei Cai,Xinqi Zhang,Jianwei Zheng,Jingwu Zheng,Rongyao Li,Haibo Chen,Liang Qiao,Yao Ying,Wangchang Li,Jing Yu,Juan Li,Shenglei Che
To address the operational safety hazards associated with using high-concentration inorganic phosphoric acid as a surface treatments to enhance the high-temperature oxidation resistance of Nd-Fe-B magnetic powders, this study innovatively proposes an environmentally friendly organic phosphonic acid (methylene diphosphonic acid, MDPA) as an alternative solution. By comparing the effects of inorganic phosphoric acid and MDPA surface treatments on the magnetic properties and thermal stability of magnetic powders, it was found that phosphating-treated samples exhibited slight decrease in coercivity H cj and maximum magnetic energy product (BH) max at room temperature compared to untreated samples. However, at 340 °C, the (BH)max and Hcj of untreated samples dropped sharply by 98.55 % (from 4.97 to 0.07 MGOe) and 92.72 % (from 9.62 to 0.70 kOe), respectively. In contrast, the inorganic phosphate-treated samples showed only a slight decline of 13.55 % (from 4.53 to 3.92 MGOe) and 1.22 % (from 9.39 to 9.28 kOe). The MDPA-treated samples exhibited the best thermal stability, with minimal losses in both (BH)max and Hcj, decreasing by only 6.88 % (from 4.66 to 4.34 MGOe) and 0.69 % (from 9.43 to 9.36 kOe), respectively. Microstructural analysis revealed that the dense metal phosphate conversion layer formed during phosphating was the key to maintaining high-temperature magnetic performance. Specifically, inorganic phosphoric acid treatment preferentially corroded Nd-rich intergranular phases, resulting in a higher Nd content in the conversion layer. In contrast, the iron phosphate salt formed by MDPA treatment dominates the transformation layer, effectively reduces the damage to the microstructure of the magnetic powder. Our research provides a surface treatment solution that combines safety and efficiency for the performance protection of rare-earth magnetic powders in high-temperature injection molding processes.
研究领域:
材料科学
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表面工程
·
磁学
·
环境化学
·
稀土材料
✓ 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）