JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Yali Zhao,Zhiguang Zhang,Lei Dai,Suobo Zhang
A novel diacyl chloride monomer dimethyl (3,5-bis(chlorocarbonyl)phenyl)phosphonate (compound(I)) with a phosphonate group (–PO(OCH 3 ) 2 ) was successfully synthesized and then blended with 2,2′,4,4′-biphenyl tetraacyl chloride (BTEC) as organic phase monomers to prepare RO membranes for brackish water desalination. BM-X was utilized to represent RO membranes prepared by compound (I). X represented the concentration percent of compound (I) (%) in Isopar G solutions，which was the ratio of the concentration of compound (I) to the concentrations of compound (I) and BTEC. When X increased from 0% to 50%, the water flux of BM-X improved from 35 L/m 2 h to 79 L/m 2 h while holding high salt rejections (99.1–99.5%). The enhancement of membrane hydrophilicity was certified by the contact angle decreasing from 83° to 38° with compound (I) content increasing from 0% to 50%. Because the improvement of membrane hydrophilicity made for the enhancement of membrane antifouling, BM-50 exhibited a lower water flux decline and irreversible fouling degree compared with a commercial RO membrane (BW30FR, Dow Filmtec). The irreversible fouling degree reached 6.8% after 1500 min three cycles fouling which was lower than 14.1% of BW30FR. Finally, BM-50 showed a very good and stable desalination performance for 30 days measured in a pH=6.0 and 2000 ppm NaCl solution.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Cuicui Shao,Kai Tuo,Weifeng Hou,Chuyao Liang,Yi Li,Yuxin Sun,Wei Xu,Shuyang Cao,Zhijian Li,Shouzhi Pu,Chunhui Deng
Extraction of uranium represents one of the valuable but challenging processes in the fields of resource recycling and environmental protection. Here, a low-cost and efficient phosphate-based hydrogen-bond organic framework (P-HOF) was designed for the adsorption of uranium with abundant phosphate groups on its surface, exhibiting superior removal performance (Q m = 1066.0 mg g −1 ) for uranium. It had high selectivity and good recyclability for U(VI) in simulated seawater, and after five adsorption-desorption cycles, the adsorption capacity of uranium decreased slightly, but it can still be maintained at more than 80 %. Impressively, P-HOF demonstrated excellent uranium removal capabilities across a wide pH range, with removal rates exceeding 70 % even under acidic conditions (pH = 1), and the P-HOF adsorbed 7.58 mg g −1 of uranium from natural seawater under 13 days. This work indicates that the phosphonate-based P-HOF could be utilized as a promising adsorbent for the effective removal of uranium from seawater.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Lili Liang,Hao Zhang,Xiaoyan Lin,Kaiyin Yan,Mengsha Li,Xunhai Pan,Yang Hu,Yan Chen,Xuegang Luo,Ran Shang
Although various kinds of adsorbents have good uranium adsorption capacity, they still meet the challenge in capturing uranium under highly acidic condition. Therefore, efficiently extracting uranium under strong acidic condition become the pursuit of researchers. In this study, a new phytic acid decorated porous organic polymers (POPs) named MA-U-PA was prepared by synthesizing a organic framework (MA-U) using melamine and uracil and with subsequent phytic acid modification. The results showed that the excellent stability of the prepared organic framework and strong uranium chelating ability of phytic acid endowed the as-prepared material being an excellent adsorbent under strong acidic condition. The adsorption capacity achieved 106.7 mg·g -1 at the pH of 1 which was much higher than that of MA-U and most of other adsorbents. The study of modification mechanism confirmed that the hydrogen bonds interaction of phytic acid with MA-U lead to the successful modification. In addition, the phosphonate groups of PA was mainly the active groups chelated with uranium. Moreover, the uranium adsorption process of MA-U-PA was in accordance with the pseudo-second-order kinetic and Langmuir isothermal model. The newly prepared phytic acid decorated porous organic material could achieve efficient uranium capturing from highly acidic nuclear wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 1
·870-885
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IF 3.553
Jia Daikun,Yang Jianxiao,He Jiyu,Li Xiangmei,Yang Rongjie
Abstract The rapid depletion of energy resources is the most serious challenge facing humanity today. Energy consumption by buildings is the largest component of energy consumption, and most of it is in the form of heat loss. Therefore, many buildings use rigid polyurethane foam (PUF) as thermal insulation material to effectively reduce heat loss. However, the greatest disadvantage of PUF is its high flammability. In this work, to reduce the risk of fire caused by PUF, melamine-based polyol containing phosphonate and alkynyl groups (MF 3.5 and MB 3 F 3 ) is synthesized and used to improve the flame retardancy of PUF by replacing common polyether polyol. The effects of MF 3.5 and MB 3 F 3 on the physical and mechanical properties, cell morphology, thermal stability and flame retardancy of PUF are systematically studied. The research results show that the flame-retardant polyols have no effect on the thermal insulation properties of PUF, but result in a slight decrease in compressive strength. Thermogravimetric analysis proves that MF 3.5 and MB 3 F 3 can increase the temperature of the maximum mass loss rate and reduce the maximum mass loss rate, and significantly increase the char yield at 800 °C. The limiting oxygen index (LOI) value is increased to 24.3%. Cone calorimetry experiments show that MB 3 F 3 reduces the peak heat release rate and total heat release by 28.2% and 30.5%, respectively. Vertical combustion tests show that the average burning rate of the flame-retardant PUF is much slower, and melt-dripping behavior is eliminated. The flame retardancy of PUF is improved mainly through a condensed phase mechanism. Graphic abstract
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ruijuan Wang,Cuicui Li,Wei Tian,Hao Liang,Nana Wang,Hongping Zhang,Fupeng Jin,Ruibin Guo,Zunli Mo,Nijuan Liu
In order to ensure the sustainable development of nuclear energy in the future and reduce the damage of nuclear-contaminated water to the ecological environment and organisms, it is of great significance to extract and remove uranium from the environment. In this work, phosphorylated functionalized MXene (TBP-M-OH(e)) was synthesized using a sacrificial template method. Due to the removal of the template, it exhibited a higher surface phosphoryl grafting rate, a looser structure, and a faster adsorption rate compared with TBP-M-OH. The uranium adsorption capacity measured at 298 K, pH=6, C 0 =100 mg·g −1 , m: V=0.5 g·L −1 was 885.00 mg·g −1 along with high selectivity, exceeding most of the reported adsorbents. Even after five cycles of experiments, the uranium adsorption capacity remains satisfactory. The adsorption mechanism of TBP-M-OH(e) was described by FTIR and XPS. The high adsorption performance was attributed to the strong affinity of the phosphonyl group for uranium, as well as the synergistic effect of the amine group in APTES and the functional group of MXene itself for uranium. In conclusion, TBP-M-OH(e) showed an excellent potential for the treatment of nuclear contaminated water.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zeya Li,Xin Wu,Mingyu Zhai,Shaojun Ma,Tifeng Jiao,Xiuli Wang,Laizhou Song
Despite significant advancements in nanofiltration (NF) technology, achieving a balance between high salt rejection and sufficient water permeability remains a critical challenge, thereby triggering tremendous efforts to develop performance-enhanced NF membranes. In this study, an improved interfacial polymerization method was used to introduce ethylenediamine tetramethylphosphoric acid (EDTMPA) into the aqueous phase and tetrabutyl orthotitanate (TBOT) into the organic phase. Consequently, the hydrophilic and negatively charged phosphonic acid groups were incorporated into the ultrathin separation layer of the fabricated NF membrane (NF-E-T) via the chemical bonding reaction between TBOT and EDTMPA, for the aim of enhancing salt rejection and water permeability. The physicochemical properties of the prepared membrane were analyzed using various characterization techniques, and molecular dynamic simulations were executed to validate the mechanisms underlying structural and performance changes of the membrane. The fabricated NF-E-T membrane exhibits a reduced separation layer thickness, enhanced hydrophilicity and slightly larger pore sizes, contributing to the improvement of membrane permeability; the increased negative charge in membrane surface and uniform pore distribution maintain the high salt rejection. Molecular dynamics simulations confirm that the incorporation of EDTMPA significantly enhances the diffusion rate of PIP and facilitates the formation of a thinner polyamide layer. The EDTMPA-TBOT complex promotes the diffusion of water molecules within the membrane matrix, thereby providing a favorable condition for the improvement of water permeability. Moreover, this membrane shows significant improvements in anti-fouling performance, oxidation stability, and long-term operation stability, achieving the favorable treatments for two types of industrial wastewater. This work will provide a firm guideline for developing high-performance nanofiltration membranes.
研究领域:
材料科学
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环境工程
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膜分离技术
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化学工程
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水处理
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高分子化学
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表面化学
✓ 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）