CELLULOSE
·
2025
·
IF 4.8
Chen Zhibiao,Zhan Bin,Li Shuyi,Wei Dongsong,Zhou Wenting,Fang Zhengping,Liu Yan
With the escalating severity of oily wastewater discharge, the development of novel and efficient adsorption materials is an urgent necessity. Bio-based aerogels, due to their distinctive attributes, including low density, high porosity, sustainability, and safety, have emerged as ideal absorbents for oil spill remediation. In this study, aerogels with ultra-low density were prepared from the renewable biomass material, pectin, through an innovative ice/bubble dual-template method. In this process, with the help of sodium dodecyl sulfate, microbubbles were introduced by high-speed stirring to decrease the density of aerogels. At the same time, phytic acid also played a role in promoting pectin crosslinking and enhancing the flame-retardant properties of aerogels, significantly improving the safety of their transportation and application. After silane modification, the aerogel exhibited ultra-low density (10.91 mg/cm 3 ), exceptional superhydrophobicity (152°), outstanding oil absorption capacity (110 g/g), and flame retardancy. This work underscored the significant and promising prospects of bio-based aerogels in addressing oil pollution challenges, highlighting their potential as optimal candidates for sustainable and effective environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
BMC MICROBIOLOGY
·
2024
·Vol. 24
·期 1
·1-12
·
IF 4
Yang Wei-Kang,Gong Zhu,Wang Bao-Teng,Hu Shuang,Zhuo Ye,Jin Chun-Zhi,Jin Long,Lee Hyung-Gwan,Jin Feng-Jie
With the development of industry and modern manufacturing, nondegradable low-density polyethylene (LDPE) has been widely used, posing a rising environmental hazard to natural ecosystems and public health. In this study, we isolated a series of LDPE-degrading fungi from landfill sites and carried out LDPE degradation experiments by combining highly efficient degrading fungi in pairs. The results showed that the mixed microorganisms composed of Alternaria sp. CPEF-1 and Trametes sp. PE2F-4 (H-3 group) had a greater degradation effect on heat-treated LDPE (T-LDPE). After 30 days of inoculation with combination strain H-3, the weight loss rate of the T-LDPE film was approximately 154% higher than that of the untreated LDPE (U-LDPE) film, and the weight loss rate reached 0.66 ± 0.06%. Environmental scanning electron microscopy (ESEM) and Fourier transform infrared spectroscopy (FTIR) were used to further investigate the biodegradation impacts of T-LDPE, including the changes on the surface and depolymerization of the LDPE films during the fungal degradation process. Our findings revealed that the combined fungal treatment is more effective at degrading T-LDPE than the single strain treatment, and it is expected that properly altering the composition of the microbial community can help lessen the detrimental impact of plastics on the environment.
CAS / MDL:
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Junzong Feng,Xin Wang,Yonggang Jiang,Dongxuan Du,Jian Feng
Polyimide aerogels for low density thermal insulation materials were produced by 4,4′-diaminodiphenyl ether and 3,3′,4,4′-biphenyltetracarboxylic dianhydride, cross-linked with 1,3,5-triaminophenoxybenzene. The densities of obtained polyimide aerogels are between 0.081 and 0.141 g cm–3, and the specific surface areas are between 288 and 322 m2 g–1. The thermal conductivities were measured by a Hot Disk thermal constant analyzer. The value of the measured thermal conductivity under carbon dioxide atmosphere is lower than that under nitrogen atmosphere. Under pressure of 5 Pa at −130 °C, the thermal conductivity is the lowest, which is 8.42 mW (m K)−1. The polyimide aerogels have lower conductivity [30.80 mW (m K)−1], compared to the value for other organic foams (polyurethane foam, phenolic foam, and polystyrene foam) with similar apparent densities under ambient pressure at 25 °C. The results indicate that polyimide aerogel is an ideal insulation material for aerospace and other applications.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 1
·88
·
IF 3.8
Zheng Dong,Yuanchong Yue,Jianmei Bai,Kun Chen,Mei Wang,Quan Bu
Peanut shells, a major economic and oil crop in China, boast an abundant availability and remarkably high lignin content compared to other agricultural residues. Previous work indicated that the modified hierarchical zeolite (Zn-ZSM-5/MCM41) was effective in promoting the conversion of intermediate macromolecules during the lignin pyrolysis reaction and enhancing the yield and selectivity of liquid products. Thereby, this study aims to improve the quality of liquid products in the ex situ catalytic microwave co-pyrolysis of peanut shells and LDPE by utilizing Zn-ZSM-5/MCM41. Employing a compound center experimental design, we optimized reaction conditions through response surface analysis. The impact of microwave pyrolysis temperature and the catalyst-to-feedstock ratio on yield distribution and liquid product selectivity was explored. Results indicated a marginal increase in liquid product yield with rising pyrolysis temperatures. Moreover, an initial increase followed by a subsequent decrease in liquid product yield was observed with an increase in the catalyst-to-feedstock ratio. Optimal conditions of 450 °C and a catalyst-to-peanut hull ratio of 2.34% yielded the highest bio-oil yield at 34.25%. GC/MS analysis of the bio-oil revealed a peak in hydrocarbon content at 68.36% under conditions of 450 °C and a catalyst-to-feedstock ratio of 13.66%. Additionally, the quadratic model effectively predicted bio-oil yield and the selectivity for major chemical components. This study underscores the potential of Zn-ZSM-5/MCM41 in optimizing liquid product quality during catalytic co-pyrolysis, offering insights into bio-oil production and its chemical composition.Keywords:bio-oil;pyrolysis;catalyst;LDPE;biomass
研究领域:
能源科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xiaoting Zhang,Lujian Lin,Hanyi Li,Shanle Liu,Shuai Tang,Bo Yuan,Hualong Hong,Manlin Su,Jingchun Liu,Chongling Yan,Haoliang Lu
Iron (Fe) plaques in coastal wetlands are widely recognized because of their strong adsorption affinity for natural particles, but their interaction behaviors and mechanisms with plastics remain unknown. Through laboratory incubation experiments, paired with multiple characterization methods and microbial analysis, this work focused on the characteristics of Fe plaques on low-density polyethylene plastic surfaces and their relationship with environmental factors in coastal wetlands (Mangrove and Spartina alterniflora soil). The results showed that iron plaques increased the adhesive force of the plastic surface from 65.25 to 300 nN and promoted the oxidation of the plastic surface. Fe plaque formation was stimulated by salinity , anaerobic conditions , natural organic matter, and a weak alkaline scenario (pH 8.0–8.3). The Fe content showed a stable positive correlation with heavy metals loading (i.e., As, Mn, Co, Cr, Pb, and Zn). Furthermore, we revealed that Fe plaque was positively regulated by Nitrospirae through 16S rRNA high-throughput sequencing analysis. Meanwhile, Verrucomicrobia and Kiritimatiellaeota . may act as depressants by consuming salt. This work illustrated that iron plaques could enhance the role of plastics in contaminant migration by altering their adsorption performance, providing new insights into plastic interface behavior and potential ecological effects in coastal wetlands.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 9
·49911
·
IF 2.52
Jian-Ni Liu,Da-Yong Wu,Wei-Hua Liang,Jian-Hua Cao
Achieving excellent thermal stability, good mechanical strength, and low-density in one product, is a big challenge in the design and synthesis of polyimide (PI) foams. We selected a rigid diamine monomer, 2-(4-aminophenyl)-5-aminobenzoxazole (DAPBO) to partially replace 4,4′-oxydianiline (ODA) in BTDA-ODA system, and studied the effect on properties of foamed PI products. With various molar ratio between DABPO and ODA (0:5, 1:4, 2:3, 3:2, 4:1, 5:0), the diamine(s) polymerized with 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) and produced six PI precursors (PAE-0 ~ PAE-5). After foaming and thermal imidization, corresponding PI foams (PI-0 ~ PI-5) prepared. Among them, PI-3 has a glass transition temperature of 386°C, which is 95°C higher than PI-0, and its compressive strength reaches 1.32 MPa. Moreover, PI-3 has a uniform cell structure with an average pore size of ~200 μm. The analysis results show that PI-3 is in a transition state from amorphous to partial crystalline, maintaining a balance between flexibility and rigidity. The addition of DABPO not only increases the rigidity of polymer molecular segments, but also introduces N and O atoms that can form intermolecular hydrogen bonds between molecules, which increases the packing density and arrangement regularity of polymer molecules.
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
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Shuai Guo,Yu Wang,Jianwen Yi,Deng Zhao,Deyong Che,Hongpeng Liu,Baizhong Sun
Co-pyrolysis of sludge and waste plastics is a long-term strategic approach for producing valuable fuels. However, sludge is characterized by a high protein content, which serves as a significant source of nitrogenous components in bio-oil. To improve the quality of pyrolysis products, the present study investigated the effect of low-density polyethylene (LDPE) on nitrogen transformation during the pyrolysis of sludge protein (SP). The study findings indicated that LDPE addition reduced the amount of solid residue owing to the interaction between SP and H radicals generated by LDPE pyrolysis. The thermal weight loss difference consistently remained below 0 when the SP-to-LDPE mixing ratio was 7:3, indicating that LDPE promotes the pyrolysis of SP. For the analysis of nitrogen-containing products during pyrolysis, LDPE addition significantly reduced the levels of nitrogen-containing compounds in the bio-oils of glutamate (Glu), histidine (His), and tyrosine (Tyr). Specifically, at 600°C, Glu, His, and Tyr in the bio-oils decreased by 31.4%, 33.3%, and 34.38%, respectively. No significant changes were observed in the nitrogen content within the pyrolysis char of Glu and His. However, all three amino acids exhibited a significant increase in the formation of NO x precursors due to the attack on the nitrogen positions of the heterocyclic nitrogen species by the H radicals generated by LDPE. This study contributes to research on the impact of LDPE on nitrogen migration and conversion during the pyrolysis of SP, laying the foundation for subsequent studies on pollutant removal reactions.
研究领域:
环境科学
·
能源与燃料
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 24
·期 9
·2242-2248
·
IF 5.317
Dandan Jiang,Xiqian Li,Qiong Jia
Graphical A facile synthetic strategy based on host–guest interactions was developed to prepare multilayer cucurbit[6]uril-based magnetic nanoparticles, MNPs-(HA-DAH 5 /HA-CB[6] 5 ). The compound was employed as a blood purification material for the removal of LDL from plasma because it had good blood compatibilitiy and could be easily separated with an external magnet. Efficient removal of low density lipoprotein (LDL) is a key challenge due to its high level in plasma as a primary risk factor in the pathogenesis of atherosclerotic cardiovascular disease. In this work, a facile synthesis strategy based on host–guest interactions was developed to prepare multilayer cucurbit[6]uril-based magnetic nanoparticles, MNPs-(HA-DAH 5 /HA-CB[6] 5 ). The compound was employed as a blood purification material for the removal of LDL from plasma because it had good blood compatibility and could be easily separated with an external magnet. The efficient removal of LDL was attributed to the electrostatic interactions between the positive charged apoB-100 domain of LDL and the negative charged adsorbent. Moreover, the prepared material exhibited high recyclability and could release LDL in physiological saline for recyclable use. MNPs-(HA-DAH 5 /HA-CB[6] 5 ) offered promising perspectives and broad applications in extracorporeal treatment for the removal of LDL.
研究领域:
生物医学工程
·
材料科学
·
心血管疾病研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 79
·41744-41752
·
IF 3.708
Xuegang Luo,Sizhao Zhang,Feng Ding,Ke Li,Xiaoyan Lin
A novel thermal catalyst in response to heat excitation was first synthesized and then added into low density polyethylene (LDPE) matrix to prepare corresponding films. The thermocatalytic degradation of LDPE/thermal catalyst (LEPDET) film was investigated under artificial ageing conditions. The changes in the films were evaluated by measuring the surface morphology, average molecular weight, crystallization capacity, chemical group, contact angle, and mechanical property. The results obtained show that the surface of as-prepared film was seriously destroyed because of the thermocatalytic reactions at 40 °C in darkness. A rapid decreasing tendency of the average molecular weight was clearly monitored, simultaneously, the crystallization capacity decreased significantly. The presence of carbonyl groups was observed during degradation process, and the above-mentioned groups were also detected mediately in contact angle view. Additionally, on the basis of the above-mentioned evidences, a possible mechanism for the thermoctalytic degradation was also established in detail. Thus, the effectiveness of thermocatalytic route has been successfully demonstrated by heat excitation at near room-temperature. It is hoped that our study may develop an alternative method for the disposal of polymeric film in the future.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 42
·20769-20777
·
IF 9.931
Zhenchao Qian,Meng Yang,Rui Li,Dongdong Li,Jianling Zhang,Yaonan Xiao,Chuncheng Li,Rongjie Yang,Ning Zhao,Jian Xu
Efficient and durable thermal insulators combined with flame resistance are required for energy efficient buildings. Here, we fabricate poly(p-phenylene benzobisoxazole) (PBO) nanofiber aerogels (PBOAs) through a proton-consumption-induced gelation of PBO nanofiber sol and a controlled freeze-drying with a low cooling rate, followed by thermal cross-linking. Nanofibrous networks based on physical entanglement of nanofibers and chemical cross-linking at the junctions were obtained, leading to ultralow density (3.6–15.7 mg cm−3), high porosity (98.9–99.7%), high specific surface area (155.4 m2 g−1), low thermal conductivity (26.2–37.7 mW m−1 K−1) and superelasticity under an ultimate strain of 99%. More importantly, the aerogels achieve an excellent thermal stability, including a high decomposition temperature of 650 °C and a high long-term use temperature of 350 °C. Furthermore, the PBOAs are characterized by outstanding flame resistance, reach the nonflammable level in vertical burning tests (UL-94, V-0 class), and show a limiting oxygen index (LOI) as high as 52.8%. The aerogels cannot be ignited under simulated real-scale fire conditions, leaving suppressed smoke emission and reduced potential for flame spread and fire hazards. High thermal insulation and resistance to a 1000 °C flame has been achieved by compositing PBOAs with fumed silica. Thus, the PBOAs have promising applications in energy efficient areas, such as buildings, aerospace and many other fields, especially under harsh conditions.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Bowei Chen,Yin Gao,Yutie Bi,Xuan Luo,Lin Zhang
This was a fascinating study which introduced a brand new method to synthesize carbon aerogels from polyacrylic acid by using CO as a reducing agent, during which, with the help of metal salt, polyacrylic acid ensured the development of the aerogels׳ properties of huge surface area and low density. Required supercritical drying and thermal treatment were adopted to generate high surface area (1560 m 2 /g). According to the results demonstrated by the X-ray photoelectron spectroscopy (XPS) and Energy-dispersive spectrometry (EDS), the sample was an inorganically porous material, with a density of approximately 20 mg/cm 3 . In summary, the attractive properties of the carbon aerogel expounded the potential application possibility of their nanostructures on electrode.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2011
·
IF 2.234
Zhenhu Cao,Yan Zhang,Pingan Song,Yuanzheng Cai,Qi Guo,Zhengping Fang,Mao Peng
A novel metal chelate complex containing phosphorus, nitrogen and zinc (II) ion was synthesized and used as the flame retardant of low density polyethylene (LDPE). The zinc chelate complex was synthesized by reacting zinc acetate with the ligand of tetraethyl (1,2-phenylenebis(azanediyl)) bis (2-hydroxylphenylmethylene) diphosphonate (TEPAPM). The chemical structure of the target Zn-TEPAPM was confirmed by FTIR, 1 H NMR, 13 C NMR and 31 P NMR spectra. The flame retardancy and thermal behavior of LDPE containing various amount of Zn-TEPAPM were investigated by limiting oxygen index test, thermogravimetric (TG) analysis and cone calorimetry . The results show that Zn-TEPAPM can greatly increase the thermal stability, the char formation and smoke suppression ability of LDPE. The TG curves show that even when the filler content of Zn-TEPAPM is as low as 1 wt% in LDPE, the onset degradation temperature of LDPE is increased from 429 °C to 442 °C, and the maximum degradation temperature is increased from 469 °C to 488 °C. Also, a reduction of 32% for the peak heat release rate (PHRR) is obtained in the cone test. Moreover, Zn-TEPAPM is demonstrated to be a very effective synergist of ammonium polyphosphate (APP). When 1 wt% of Zn-TEPAPM was introduced into the LDPE/APP (mass ratio 80/19) blend, the PHRR value is reduced by 32%, compared with that of LDPE/APP blend without Zn-TEPAPM, and the char layer becomes more compact and intact.
研究领域:
高分子化学
·
材料科学
·
阻燃技术
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）