DESALINATION
·
2022
·
IF 11.211
Qingbai Zhao,Yuqin Wan,Fan Chang,Yifan Wang,Hongkun Jiang,Lei Jiang,Xinyue Zhang,Ning Ma
As a green and renewable energy source , solar energy is one of the best options to drive desalination and water purification processes. In this paper, a lightweight commercial polyurethane foam (PUF) was chosen as the support modified with a black polypyrrole (PPy) layer to obtain a simple and effective photothermal conversion “black foam” (PPy-PUF). Due to the excellent spectral absorption capacity of the polypyrrole layer as well as surficial PPy micro-wrinkles, the surface temperature of the black foam rapidly increased when irradiated with solar illumination. Combined with the porous structure , low thermal conductivity , and hydrophilicity of the polyurethane foam, it can be continuously used for desalination and water purification purposes. The evaporation rate of water can be as 3.789 kg·m −2 ·h −1 under 4-sun and the evaporation efficiencies as 86.9% under 1-sun. The internal microstructure and photothermal conversion performance of the PPy-PUF materials proved that they are highly suitable for practical applications such as desalination and water purification, which provide feasible solutions for water shortage, sustainable energy, and environmental improvement.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Long Pang,Yanyan Zhang,Huiqiang Yang,Meijuan Zhang,Ziling Huang,Haozhao Wang,Baodan Jin
In this study, the gas-phase retention volume behavior of four highly volatile organophosphate esters (OPEs) on polyurethane foam (PUF) was studied using a frontal chromatogram. The breakthrough volumes ( V B ) of trimethyl phosphate (TMP), triethyl phosphate (TEP), tripropyl phosphate (TPrP), and tri-n-butyl phosphate (TnBP) were 0.33, 0.59, 10.5, and 32.4 m 3 , respectively. A significant negative correlation was found between the logarithm value of V B and the subcooled liquid vapor pressure ( P L ) with an r 2 of 0.905, indicating that the vapor penetration depends on both the volatility and total air volume. The enthalpy of desorption and vaporization (Δ H S −Δ H V ) showed a significant difference between the tested OPEs and polycyclic aromatic hydrocarbons (PAHs), revealing that the strength of the sorption interaction of the tested OPEs vapor on PUF should be different from that of PAHs. The PUF-air partition coefficients ( K PUF-air ) of the tested OPEs ranged from 4.3 to 8.1, which were lower than those of three-to four-ring PAHs (7.02–10.2) and organochlorines (8.01–9.72), revealing that the partition of highly volatile OPEs on PUF is lower than that of low-volatile compounds. The PUF/XAD cartridge improved the absorption efficiency of the tested OPEs; however, its sorptive capacity was still limited.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53546
·
IF 3.057
Wei Lu,Zhipeng Zeng,Zhenglong He,Yuntao Liang,Yong Sun,Shuanglin Song,Lili Wang,Ruling Liu
A highly dispersed melamine/red phosphorus (MA/RP) composite flame retardant was prepared by means of simple mechanical grinding. After co-thermal pretreatment with polyether polyol (PPG-2000) at 135°C, organic–inorganic hybrid foams (MA/RP/HF) containing MA/RP flame retardant were prepared by the one-step method using main raw materials such as polyisocyanate and sodium silicate. When 0.5 wt% MA/RP with the mass ratio of 1:5 is added, MA can realize the uniform dispersion of RP in the substrate and enhance its flame retardancy, and the obtained MA/RP/HF presents uniform and closed pores and excellent basic properties. The TG results reveal that MA/RP/HF shows good thermal stability and the corresponding char residual rate reaches 37.9% at 800°C. The flame retardant test results prove that MA/RP/HF is capable of passing the V-0 grade, with the LOI value being 26.8%. According to the cone calorimeter analysis, its peak heat release rate and total heat release decrease by 30.1% and 51.7% compared with those of rigid polyurethane-based foam and by 40.1% and 30.0% compared with those of pure HF, respectively. Finally, the synergistic flame retardancy mechanism of MA and RP on polyurethane-based foam was discussed.
研究领域:
材料科学
·
燃烧与防火研究
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 9
·e202204060
·
IF 2.1
Guang Shuo Zhu,Jia Yu Zheng,Chang Bao Han,Hao Zhang,Peiyu Chang,Wen Kang Zhao,Junda He,Yi Xia,Xuemei Song,Hui Yan
Graphical An amino groups modified MnO x catalyst (DEA-MnO x -PUF) was prepared for HCHO removal. During the indoor environment, the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %). It is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Indoor formaldehyde (HCHO) pollution has more and more serious adverse effects on human health, it is urgent to develop a material that can be embedded in the air purifier to achieve HCHO's degradation efficiently. In this work, based on the carrier material of polyurethane foam (PUF) modified by amino groups diethanolamine (DEA), we propose a strategy to prepare a manganese oxide compound catalyst (DEA-MnO x -PUF). During the static testing (C HCHO : 11.591 ppm, T: 25 °C), the catalyst shows higher HCHO removal efficiency (93.9 %) than that of unmodified MnO x -PUF catalyst (88.6 %), and it achieves high HCHO-to-CO 2 conversion (68.5 %). Additionally, during the continuous single-pass catalysis testing (C HCHO : 11.591 ppm, T: 25 °C, 240000 mL/(g cat h)), HCHO removal efficiency can be maintained around at 95 % within 50 hours. The excellent performance is attributed to the continuous decomposition of intermediates during the catalytic process by amino groups cross-linked on the surface of the catalyst. Based on the block whole MnO x -based catalyst DEA-MnO x -PUF, this work will provide a new route to develop a powerful purifier material with long-term efficient removal of HCHO.
研究领域:
环境科学
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材料科学
·
室内空气治理
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 21
·e53879
·
IF 3
Lihong Wan,Sitong Yan,Lin Fang,Zhifen Wang,Yucang Zhang
As key platforms for efficient photothermal conversion and water evaporation in solar water desalination processes, the design of photothermal interface materials have become an important topic. In this study, we designed an interfacial solar evaporator with liquefied-chitin PU foams as the base material. In this structure, polyaniline and polypyrrole convert solar energy in thermal energy. After the in-situ generation of hydrogel in the polyurethane foam to reduce the evaporation enthalpy of water and rapid evaporation of water. Liquefied-chitin make a PU foam with low thermal conductivity, reduce the heat loss of the water. Notably, the excellent antibacterial property of liquefied-chitin PU foam can make the photothermal material less likely to grow bacteria in the water and affect the photothermal evaporation efficiency. The water evaporation rates of PANi/PAM and PPy/PAM reached 2.18 and 2.38 kg m −2 h −1 under 1 solar irradiation, with photothermal conversion efficiencies of 136.9% and 149.4%, respectively. This study provides a simple method for converting polymers-based foam into efficient solar thermal materials for solar-driven desalination-related applications.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 42
·e54649
·
IF 3
Haoping Peng,Jiaxin Li,Yufei Gu,Changjun Wu,Ya Liu,Yonggang Zhao,Xuping Su,Zhiwei Li
A microencapsulated flame retardant PMDOPO was synthesized by solution blending method using EGDMA as initiator and AIBN as cross-linking agent. Rigid polyurethane foams were prepared in a one-step process. PMDOPO was incorporated into the foams by blending with polycarbonate diols (PCDL) and foaming additives. The results of Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) showed that PMDOPO was well formed and uniformly dispersed in the foam. The pore size and density of the foams first increased and then decreased with the addition of PMDOPO. X-ray photoelectron spectroscopy (XPS), vertical combustion test, and thermogravimetric analysis (TGA) showed that the PMDOPO content was directly proportional to the flame retardancy and the thermal stability. The major weight loss shifted to higher temperature intervals. The amount of residual char of RPUF/PMDOPO-25 was enhanced 50 times to 10.63% compared to pure RPUF. In addition, SEM and Raman analyses of the combustion residual char revealed that a phosphorus-containing char layer was formed during thermal degradation. The dense charcoal layer helps to insulate heat and suppress combustion. The universal testing machine showed that RPUF with 15 wt% content had the best compression resistance, with an enhancement of 1.8 MPa over pure RPUF.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ping Li,Xu-Chen Jiang,Wan-Meng Song,Li-Yao Zhang,Ying-Jun Xu,Yun Liu,Ping Zhu
A novel and eco-friendly intumescent flame-retardant system based on sodium carboxymethyl cellulose (CMC) was established for wide-used flexible polyurethane foams (FPUFs). FPUF-(APP 6 CMC 1 )GN 1 with extremely uniform coatings extinguished and reached the UL-94 V-0 rating, and presented an improvement of thermal insulation properties. Moreover, there was a 58 % reduction in peak heat release rate for FPUF-(APP 6 CMC 1 )GN 1 compared with that of FPUF, and the microstructure analysis of char residues indicated that a perfect intumescent char layer had formed on the surface of FPUFs. Especially, CMC and GN enhanced the compactness and stability of char layers. Therefore, little volatile production was generated under the protection of physical layers in the high temperature as evaluated during the thermal degradation processes. Meanwhile, the flame-retardant FPUFs remained the ideal mechanical properties and obtained excellent antibacterial properties , and the antibacterial rates of E.coli and S.aureus were 99.9 % (FPUF-(APP 6 CMC 1 )GN 1 ). This work provides an eco-friendlier strategy for the design of multi-function FPUFs.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Abdullahi B. Olabintan,Tawfik A. Saleh
Oil spills have disastrous consequences on the environment. Multifarious absorbents have been applied in oil spill remediation; however, the design of cost-effective, dependable, and environmentally benign absorbents is desirable and pressing. Here, a polyurethane foam (PF) with superhydrophobic/superoleophilic properties was fabricated by surface coating of montmorillonite (MMT) nanoclay. Initially, the hydrophobic MMT was obtained by grafting octadecyltrimethoxysilane (ODTMS) onto the surface of the nanoclay and this was then used to modify the foam via a dip-coating technique. This modification produces a superhydrophobic foam with a water contact angle reaching 153.83 ± 1.86°. The as-prepared foam demonstrates high absorption selectivity and excellent absorption capacity of 29.5–66.5 times weight gain for several organic solvents and oils. The efficiency of separation for multiple oil-water mixtures reached 99.87%. After 10 cycles of absorption-desorption studies, such superhydrophobic foam still sustained good oil absorption performance, thus exhibiting outstanding reusability and desirable regeneration for practical applications. The oil and organic solvent samples could swiftly and continuously be retrieved from the water by the modified foam. The fabrication method for the superhydrophobic PF by its modification with natural clay minerals appears to be simple, economical, and promising for expandable applications in the effective separation of oil-water mixtures.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Zhaoyang Li,Yu Sun,Bing Zhou,Yuezhan Feng,Chuntai Liu,Changyu Shen
It is always a great challenge for flexible and wearable electronics to achieve excellent electromagnetic interference (EMI) shielding with good compressibility and flexibility at low filler content . Thus, TPU foam (TF) was prepared by salt following a sacrificial template method , then MXene nanosheets wrapped TF (TPU@PDA/MXene foam referred to as TPMF) was successfully fabricated using vacuum-assisted impregnation with microporous elastic TF skeletons as a substrate and polydopamine (PDA) as a binder. Benefiting from the successful three-dimensional (3D) conductive network, this foam realized a significant conductivity of 290.8 S/m and an outstanding electromagnetic interference shielding effectiveness (EMI SE) of 72.2 dB in X-band at 0.66 vol% MXene loading and 2 mm TPMF thickness. It is a remarkable fact that the SE of TPMF was reduced from 72.2 dB to 48.4 dB with no protection after compression strain of 100 cycles at 50%, far exceeding the commercial standards of EMI shielding. This work proposes a simple and economical fabrication method of highly-efficient EMI shielding composites. The prepared shielding materials may be potentially applied in wearable smart devices and aerospace equipment.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Haoping Peng,Dingding Li,Shouwu Xu,Yonggang Zhao,Yun Lei,Haoran Zhu,Qigui Tan,Zhiwei Li
In this study, sodium tripolyphosphate was used to modify starch, resulting in a novel starch-based flame retardant. The phenolic resin was employed as the matrix, with the starch-based flame retardant incorporated as a filler and applied to the surface of rigid polyurethane foam (RPUF) to prepare the composite material. Scanning electron microscopy revealed that the coating effectively penetrated the RPUF framework, forming a strong and tightly bonded layer with excellent coverage. The combustion and mechanical properties of the composite material were investigated. The results showed that, in vertical combustion tests, the composite material met the UL940-5VA standard. In thermogravimetric analysis, the composite exhibited a 42.71% increase in char residue compared with the RPUF. In three-point bending pulverization resistance tests, the composite demonstrated a 28.42% reduction in chalking compared with the RPUF coated solely with phenolic resin. This study paves a new path for the practical application of bio-based flame retardants.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Jinke Yu,Ling Sun,Lan Ding,Yufei Cao,Xiaohui Liu,Yuanlin Ren,Yuesheng Li
When confronted with a fire, the flammability of rigid polyurethane foam (RPUF) makes it extremely easy to burn violently. In this work, a green biomass derived flame retardant coating was synthesized with phytic acid as acid source, D-sorbitol as carbon source and glycine as gas source. A simple UV curing technique was used to improve the flame retardancy of RPUF . Coated RPUF exhibited a limiting oxygen index value of up to 39.7 % and successfully met UL-94 testing criteria with V-0 rating. In comparison to control RPUF, coated RPUF showed an extended ignition time of 3 s, a remarkable reduction of approximately 60 % in the peak heat release rate, and possessed commendable smoke suppression property. The flame retardant mechanism was analyzed, unveiling the emergence of compact char residue on the surface of coated RPUF after burning, accompanied by the liberation of non-combustible gases. Therefore, these results demonstrated that cost-effective UV-curable flame retardant coating forms protective char layer on the surface of RPUF, providing efficient flame retardancy while preserving its excellent properties.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2024
·
IF 8.6
Zhoumei Xu,Fukai Chu,Chuanshen Wang,Xin Wang,Yanbei Hou,Weizhao Hu,Lei Song
High charge separation and transfer efficiency are considered as key factors of photocatalysts in wastewater treatment applications. In this work, a high performance photocatalyst g-C 3 N 4 @ZnTDA was designed and applied through a facile solvothermal strategy. The microstructural, morphological, physicochemical, and photoelectrochemical properties of g-C 3 N 4 @ZnTDA were fully characterized. The photocatalytic activity of g-C 3 N 4 @ZnTDA nanoparticles under visible light source in degrading the 2,4-dibromophenol(2,4-dB) contaminants was also successfully studied. Additionally, the g-C 3 N 4 @ZnTDA composite demonstrates easy operation and good regeneration ability, making it highly promising for the efficient removal of phenolic pollutants from wastewater. Besides, a novel reutilization method for used catalyst as flame retardant and for PU foams was successfully testified. The MCN-3 as a fire-safety coating could reduce the heat release and improve flame retardancy of PU composites. This work opens a new window for valuable inspiration and structural design of reutilized MOF composites.
研究领域:
材料科学
·
环境科学
·
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）