POLYMER
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2026
·
IF 5.1
Hamza Malik,Jian He,Hui Zhang,Yong Liu,Jianyong Yu
Cellulose dissolution in N-methylmorpholine N-oxide (NMMO) remains challenged by strong hydrogen bonding, high crystallinity, and limited solvent accessibility, necessitating effective pretreatments for efficient lyocell fiber production. We introduce an integrated approach combining NaOH-induced hydrogen-bond weakening with cryogenic ball milling fragmentation to enhance macromolecular disentanglement in cellulose dissolution for the lyocell process. A multiscale characterization suite i.e. FTIR, XRD, BET, and SEM was used to confirm that the combined treatment synergistically reduced crystallinity from 86.2% to 63.8%, increased specific surface area by ∼26%, and generated a defibrillated, porous morphology. Centrifugal NMMO-retention method showed that this structural evolution significantly enhanced swelling capacity, with the NaOH and cryogenic milling combined cellulose treatment achieving a 56% higher solvent retention than native pulp in 70 wt% NMMO. Moreover, centrifugal retention profiles classified solvent as free, trapped, and bound, with combined treatment maximizing bound NMMO for optimal disentanglement. In addition, polarized optical microscopy demonstrated a reduction in dissolution time, from 50 min for native pulp to just about 20 min for the synergistically pretreated cellulose. UV-visible spectroscopy of the dope extracts further confirmed that the combined pretreatment minimizes NMMO degradation during dissolution, as evidenced by consistently lower absorbance values for the combined treatment across all wavelengths and time points (0, 24, and 72 h), indicating fewer chromophoric degradation products and superior dope quality. By linking molecular-scale activation with mechanical fragmentation, this synergistic strategy offers a sustainable and potentially energy-efficient pathway for cellulose processing, with promising applications in nanocellulose and bio-based composites.
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高影响因子
Gels
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2025
·Vol. 11
·期 4
·252
·
IF 5.3
Yanan Wang,Yanan Lu,Hao Zhong,Minghui Guo,Jingkui Li
To solve the problem of dye contamination caused by methylene blue (MB), a one-step synthesised nanocellulose (CNF) and polyacrylamide (PAM) gel network was modified by using NaOH in this study, and the prepared samples were analysed for their micromorphology, chemical structure, and adsorption-release properties. The findings demonstrated that the maximum adsorption capacity of the CNF-PAM5% was 172.08 mg/g, which followed the quasi-second-order kinetic model and the Freundlich adsorption model. The adsorption of the gel increased with the increase of the NaOH-modified concentration. However, the adsorption efficiency of the CNF-PAM5% could still reach 85% after four cycles, and the CNF-PAM5% remained intact without signs of fragmentation after 4 h of stirring and water impact, which was attributed to the introduction of CNF into the PAM network to effectively improve the mechanical properties of the gel. Moreover, toxicity tests showed no significant difference in the amount of cellular activity, even when the volume of the CNF-PAM5% sample was increased up to 10-fold. This gel, which exhibits low toxicity and excellent recycling properties, serves to reduce environmental impact during the adsorption process. Furthermore, the potential exists for utilising the gel’s methylene blue-releasing (MB) properties as a fungicide for fish.
研究领域:
环境科学
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2011
·
IF 3.603
Panfeng Long,Aixin Song,Dong Wang,Renhao Dong,Jingcheng Hao
The formation of pH-sensitive vesicles and the rheological properties of the mixtures of perfluorolauric acid (PFLA) and its salts (PFL-Na and PFL-Li) neutralized via NaOH or LiOH were investigated in aqueous solution. When the right mixing ratios of the ionized to nonionzed PFLA molecules with a very high Krafft point are established, vesicles can spontaneously form at room temperature. The vesicles spontaneously formed in the PFLA/PFL-Na/H2O system with the rigid fluorocarbon chains were determined by atomic force microscopy images. Compared to those of hydrocarbon amphiphiles, these vesicle samples, which can be kept for 2 years at room temperature, are more stable. The phase transition from the vesicle phase to the lamellar lyotropic liquid crystal phase with the increase of pH was determined by freeze-fracture transmission electron microscopy images in the PFLA/PFL-Li/H2O system. The system of perfluoro fatty acid vesicles exhibits much more interesting rheological properties, compared to hydrocarbon fatty acid vesicles. The perfluoro fatty acid vesicle solutions display a much higher yield stress and viscoelastic properties, which depend on two factors: (i) the fluorinated alkyl chains of PFL–, which are in the crystalline state at room temperature because of their rigid chains compared to analogous hydrocarbon chains, and (ii) the packing of the vesicles, which is very dense. This is the first time that pH-sensitive vesicles exhibiting birefringence were constructed through ionizing perfluoro fatty acid, which may direct primarily toward acquiring an understanding of the mechanism of vesicles depending on the right mixing ratios of the ionized to the nonionzed perfluoro fatty acid molecules with a very high Krafft point and secondarily to expand the development of fluorinated surfactants in both fundamental research and practical applications.
研究领域:
胶体与界面科学
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软物质物理
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流变学
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超分子化学
·
纳米材料
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Yuanyuan Zhang,Zhichun Si,Jian Gao,Yuxiang Liu,Liping Liu,Xiaodong Wu,Rui Ran,Duan Weng
NaOH-promoted Pt/TiO 2 catalysts are successfully prepared by a facile impregnation method assisted by NaOH and tested for the toluene oxidation reaction under visible light irradiation. Keeping molar ratio of Pt:Na = 1:8, the 0.1Pt-Na/TiO 2 catalyst (0.1 mol% Pt) shows excellent catalytic performance with more than 60% of toluene conversion at 45 °C and achieving total toluene removal at 280 °C, which is significantly better than 0.1Pt/TiO 2 catalyst. The structures and properties of catalysts are characterized by XRD, SEM, N 2 adsorption, XPS and UV–vis spectra. The positively charged Pt species stabilized by NaOH are the most active sites for photo-thermal catalyzing toluene oxidation. The influence of Pt loading and the effect of supports (active TiO 2 and inert Al 2 O 3 ) are also discussed.
研究领域:
催化化学
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环境化学
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材料科学
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光催化
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
·
IF 7.8
Zhiyun Zhao,Dengfeng Zhao,Shiyu Zhang,Yingliang Zhao
This study investigates the role of steel slag with different carbonation degrees as a CO 2 -responsive additive in NaOH-activated blast furnace slag (AAS) systems. At a 20 % replacement level, partially carbonated slag (CS1) increased the 28-day compressive strength by 65 %, while fully carbonated slag (CS2) achieved an 83 % improvement. Calorimetry revealed that both CS1 and CS2 delayed the main hydration peak due to the buffering effect of carbonate phases, yet overall reactivity increased with carbonation through the enhanced dissolution of carbonation-induced silica gels. Mechanistically, CS1 retained residual C 2 S that hydrated gradually, resulting in moderate early strength but sustained long-term gain through the gradual formation of additional C-(A)-S-H gels. By contrast, CS2 supplied abundant reactive silica and carbonate species, which accelerated early gel polymerization, stabilized pH, and promoted matrix densification. Nanoindentation confirmed this effect, showing that the elastic modulus of C-(A)-S-H increased by over 50 %, evidencing a consistent strengthening of the gel network. These findings highlight carbonation degree as a controllable parameter to balance early and long-term performance, providing a mechanistic framework for the design of multifunctional binders with integrated CO 2 sequestration and enhanced performance potential.
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高影响因子
Materials
·
2022
·Vol. 15
·期 4
·1285
·
IF 3.748
Wei Gao
Clivia miniata(CM), is an important ornamental plant and has been widely cultivated all over the world. However, there are no reports onClivia miniata-based porous biomass carbon (CMBC). In this study, for the first time, CM leaves were used to generate porous biomass carbon via NaOH activation. The structures and surface characteristics were determined using scanning electron microscopy, N2adsorption/desorption, TGA, FT-IR, X-ray diffraction, Raman and X-ray photoelectron spectra tests. CMBC has a large SSA (2716 m2/g) and a total pore volume of 1.95 cm3/g. To test the adsorption performance via adsorption experiments, the cationic and synthetic dye, malachite green (MG), was utilized as the adsorption model. The CMBC had a greatest adsorption capacity of 2622.9 mg/g at a pH value of 8 and had a fastest adsorption capacity of 1161.7 mg/g in the first 5 min. To explain MG adsorption into CMBC, the Freundlich isotherm and the pseudo-second-order kinetic model were used. The adsorption mechanism of MG was also investigated. After 10 cycles, the adsorption efficiency of CMBC to MG could still reach 85.3%. In summary, CMBC has excellent potential in dyeing wastewater pollution treatment.Keywords:biomass carbon;Clivia miniata;wastewater treatment;adsorption
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Sustainability
·
2022
·Vol. 14
·期 15
·9051
·
IF 3.889
Yufeng Guo,Chao Wang,Shuai Wang,Feng Chen,Xueyuan Wang,Zhiwei An,Lingzhi Yang
Vanadium tailings are a common solid waste in the vanadium industry. As they are rich in Fe, vanadium tailings could be a potential raw material for the blast furnace. However, the presence of approximately 4% Na2O in vanadium tailings is a major impediment to its return to the blast furnace. A novel method for removing sodium from vanadium tailings by calcification roasting and subsequent NaOH leaching was proposed in this work. The method demonstrated that calcification roasting of vanadium tailings can not only volatilize a part of sodium but also facilitate the dissolution of sodium during the subsequent NaOH leaching process. The thermodynamic analysis and behaviors of vanadium tailings during calcification roasting were systematically investigated. The transformation of sodium-containing phases in vanadium tailings during calcification roasting was studied. Further, the promoting effect of calcification roasting on sodium leaching by NaOH was clarified. The total removal efficiency of sodium was 80.37% under optimal conditions, and the residue obtained after sodium removal can be used as a raw material in the blast furnace process for in-plant recycling.Keywords:vanadium tailings;sodium removal;calcification roasting;volatilization;leaching
研究领域:
冶金学
·
环境工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fawen Liang,Zhang Liu,Xueding Jiang,Jiesen Li,Kaibang Xiao,Weicheng Xu,Xin Chen,Jinzhi Liang,Zhifeng Lin,Meng Li,Xiaolian Wu,Hailong Wang
In this study, NaOH-modified biochar supported Fe/Mn bimetallic composite (Fe-Mn/AW-BC) was prepared to remove tetracycline (TC) through activating peroxymonosulfate (PMS). Results showed that about 97.9 % of TC was degraded and the rate constant of Fe-Mn/AW-BC + PMS system was 37 folds higher than BC + PMS system. Experimental results confirmed that both radical and non-radical pathway were contribute to the catalytic system. Density functional theory (DFT) results also suggested that Fe-Mn/AW-BC sample was favorable for adsorbing PMS based on the length O O bond from PMS and the E ads of catalysts. The superior activation ability was ascribed to the accelerating formation of reaction active species and other oxidation species by bimetallic structures of Fe-Mn and oxygenated functional groups of BC. Additionally, the redox cycles of Fe 3+ /Fe 2+ and Mn 3+ /Mn 2+ under Fe-Mn-BC synergism promoted the generation of the radicals, whereas the carbon shell effectively inhibited metals leaching of Fe-Mn/AW-BC, and 77.8 % of TC can be still removed within 60 min after five consecutive cycles. Notably, Fe-Mn/AW-BC system has special characteristic of wide pH usable range and broad-spectrum adaptability towards various organic pollutants and various water environments. Based on intermediate identification and Fukui function calculation, the degradation pathways of TC were also proposed. This study highlights the applications of biochar for the environmental catalysis.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
WASTE MANAGEMENT
·
2025
·
IF 7.1
Qiang Gao,Hongyun Hu,Chan Zou,Yang Hu,Huan Liu,Xian Li,Hong Yao
Molten salt thermal treatment of solid waste is a promising way for energy recovery and pollutant removal. However, the migration of nitrogen during pyrolysis of waste tires poses a challenge for cleaner production. This study investigated nitrogen conversion pathways during waste tires pyrolysis using a binary NaOH-Na 2 CO 3 salt at 425, 500, and 575 °C. The results demonstrated that amine-N and pyrrole-N were the main N-containing species in waste tires. Compared to conventional pyrolysis, the molten salt enhanced the deamination of the amine-N while increasing levels of NH 3 and aniline. Owing to the catalytic benefits of molten salt, the C-N bond cleavage of amine-N was initiated by electron transfer involving the combination of NH 2 -Phenyl structures with Na + . The hydrocracking of Phenyl-NH-Phenyl in amine-N was facilitated by the available H radicals (or H 2 ). Furthermore, molten salt obstructed the contact of C(N) sites on the char surface, causing the suppression of HCN production. The SH radicals might be consumed by OH – ions, which disabled the formation path of benzothiazole from aniline and SH radicals. Comparatively, pyrrole-N showed limited reactivity and remained in char. This work contributes to nitrogen regulation during the molten salt treatment of solid waste.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
WASTE MANAGEMENT
·
2026
·
IF 7.3
Yanbo Pei,Qing Zhao,Liwei Liu,Jingjing Yang,Siyu Zhang,Xuejiao Zhang
NaOH enabled solvent-free mechanochemical recycling of spent LiFePO 4 BM. • The process achieved 98.83 % Li leaching with only 0.27 % Fe co-leaching. • NaOH destroyed the LiFePO 4 crystal structure and formed Li 3 PO 4 . • Fe 2+ oxidation was promoted by NaOH and atmospheric O 2 during milling. • The recovered product reached 99.6 % Li 3 PO 4 purity. The rapid increase in spent lithium iron phosphate (LiFePO 4 ) batteries brings significant challenges related to environmental pollution, human health risks, and resource sustainability. Conventional recycling technologies are often hampered by high energy consumption, secondary pollution, and operational hazards. This study proposes a sustainable mechanochemical approach for recycling spent LiFePO 4 black mass, based on the targeted destruction of the stable LiFePO 4 crystal structure. Using sodium hydroxide as an efficient co-grinding agent in a solvent-free system, a superior lithium leaching efficiency of 98.83 % was achieved under optimized conditions, while iron co-leaching was effectively suppressed to 0.27 %. Comprehensive characterizations, including X-ray diffraction, X-ray photoelectron spectroscopy, and Mössbauer spectroscopy confirmed the destruction of the LiFePO 4 crystal structure, the formation of Li 3 PO 4 , and the oxidation of Fe 2+ . An economic assessment demonstrates the viability of this procedure, yielding a net profit of $0.9659 per kilogram of LiFePO 4 black mass. This work presents an efficient, economically viable, and environmentally benign mechanochemical strategy for LiFePO 4 battery recycling, offering fundamental insights into crystal structure destruction for sustainable resource recovery.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xiangli Kong,Dawei Gong,Wei Ke,Minghui Qiu,Kaiyun Fu,Peng Xu,Xianfu Chen,Yiqun Fan
A ceramic membrane with multichannels generally has a higher specific area and larger throughput compared to that with a single channel, which is beneficial to the industrialization of ceramic membrane contactors for SO2 absorption. In this work, the mass transfer performance of SO2 absorption into NaOH solution was investigated at various gas and liquid operating conditions in a membrane contactor packed with a 19-channel hydrophilic membrane. The results showed that increasing the NaOH concentration can offset the effect of membrane thickness. To analyze the mass transfer process, a 3D mass transfer model was developed to simulate the concentration distribution of the components. The simulated SO2 fluxes were consistent with the experimental results. Additionally, the mass transfer model was applied to optimize the structure of channels in multichannel ceramic membranes. The operational mode of the multichannel ceramic membrane is optimized by blocking some inside channels to reduce the mass transfer resistance.
研究领域:
化学工程
·
环境工程
·
膜技术
·
传质
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DOI
高影响因子
Processes
·
2023
·Vol. 11
·期 10
·2827
·
IF 3.5
Chao Song,Yangang Sun,Li Zhang,Shuang Liu,Jinguo Wang,Wei An,Yong Men,Zhenrong Yan
The photoreduction of CO2to other products containing carbon through simulated photosynthesis is a promising area of research. However, given the complexity of the CO2photocatalytic reduction reaction, it is crucial to adjust the structure of the photocatalysts. The focus of this study was on creating NaOH-modified Bi2WO6nanosheet photocatalysts via a one-step hydrothermal route and using them to convert CO2into CO through photocatalytic reduction under the condition of not using an electron sacrifice agent. The results of characterizations and activity data showed that adding an appropriate amount of NaOH significantly improved the photoreduction activity of CO2, as seen in the BWO-2 catalyst. The efficiency of photocatalysts could be improved by tuning the band structure through the addition of an appropriate amount of alkali. This adjustment improves the separation of photogenerated carriers and controls the concentration of oxygen vacancy to reduce recombination. As a result, the photocurrent activity is highly enhanced, leading to better reduction performance compared to unmodified photocatalysts. In experiments, the CO yield of the modified photocatalyst BWO-2 remained above 90 μmol/g after four trials, indicating its effectiveness in reducing CO2. This study offers insights into the regulation of band structure in bismuth-based photocatalysts for efficient CO2reduction.Keywords:photocatalysis;band gap structure;sheet structure;alkali solution corrosion;CO2photoreduction
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）