JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed H 2 O 2 system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and H 2 O 2 decomposition to O 2 were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O 2 - radicals, which reacted with NO to form ONOO - , and ONOO - would be gradually transformed into NO 3 - and NO 2 - in the air. The effect of some primary factors on the NO removal efficiency and the percentage of H 2 O 2 decomposition to O 2 were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing H 2 O 2 concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of H 2 O 2 decomposition to O 2 , H 2 O 2 concentration and reaction temperature promote the decomposition of H 2 O 2 to O 2 , while NO concentration has an inhibiting effect on it.
研究领域:
环境科学
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化学工程
·
大气化学
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DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yan Li,Yun Liu,Ziqian Liu,Xin Wan,Hui Chen,Jinrong Zhong,Yue-Fei Zhang
Here we report an efficient strategy to separate and recycle acid blue 93 (AB93) from mixed anionic dyes selectively within sodium hydroxide activated A/CS adsorbent (N-A/CS). This work broke the common sense that the larger the specific surface area, the better the adsorption property is, which provided an alternative strategy to separate dyes. The adsorption equilibrium of AB93 could be achieved approximately within 1–2 min, and the maximum adsorption capacity was up to 2500 mg/g. Besides, it can be activated continuously and reused at least 15 times. In mixed anionic dyes, the adsorption selectivity of N-A/CS on AB93 in the mixture of AB93 and acid fuschin (AF) reached up to 99.7 %. Molecular dynamics simulation revealed that the trend of adsorption energy for dyes qualifies well with the experimental order of adsorption capacities and molecular sizes among five anionic dyes based on molecular matching effect. Thus, N-A/CS is a low-cost, easily-preparable, significantly-effective-and-reusable adsorbent, providing a promising “size-matching” strategy to adsorb multi-component dye systems.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 24
·5546
·
IF 4.967
Aini Wu,Wei Ma,Zhiyu Yang,Shufen Zhang
Cationization of cotton is considered to be an effective way to realize salt-free dyeing of reactive dyes. However, applying cotton modified with glycidyltrimethylammonium chloride (GTA) suffers from large consumption of the cationic reagent. One of the reasons is that high crystallinity of cotton fibers hinders the penetration of the reagents into the cellulose interior and limits the reaction between them. This paper designed to use alcohol-water-NaOH system to pretreat the fibers before cationization. With this method, crystallinity of the cotton fibers is decreased and more reactive –OH is exposed, resulting in much higher fiber-reagent reactivity and increased GTA utilization. Influence of alcohol type, alcohol-to-water ratio, and quantity of NaOH on fiber crystallinity and GTA dosage for cationization are all examined. It is found that for achieving 96.0% fixation of C.I. Reactive Black 5 in the absence of salt, GTA dosage can be reduced by half when the fibers are pretreated by alcohol-water-NaOH. Compared with ethanol,n-propanol and isopropanol,tert-butyl alcohol incorporated system shows better performance in increasing fiber reactivity due to their weaker ability to dissolve ions. In this study, XRD and FT-IR are used to demonstrate changes in crystallinity of the fibers after pretreatment. The alteration in micromorphology and hydrophilicity of the pretreated fibers is observed by SEM and water contact angle test, respectively. Furthermore, the alcohol-water-NaOH system can be recycled to show very good repeatability. Notably, all dyed samples pretreated with the system present high color saturation and satisfactory color fastness, especially that the wet rub fastness reaches 4–5 grade, which is one grade higher than that obtained from the conventional dyeing with salt. The above findings prove that alcohol-water-NaOH pretreatment is effective in enhancing reactivity of the cotton fibers and penetrability of the agent, and it shows promising prospects in real application.Keywords:cationization;cotton fiber;alcohol-water-NaOH pretreatment;salt-free dyeing;crystallinity
研究领域:
纺织科学
·
材料化学
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DOI
PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Mengyue Shi,Yanlei Hu,Xin Luo,Liang Liu,Juan Yu,Yimin Fan
Natural silk nanofibers (SNFs) can not only be used as good building blocks for two- or three-dimensional biomaterials but also provide a clue for understanding the theory of structure–function relationships. Nevertheless, it is still difficult to directly extract SNFs from natural silk fibers due to their high crystallinity and recalcitrant complex structures. In the present study, a dilute alkali-assisted separation of high-yield SNFs is proposed. The degummed silk was first treated with a tiny amount of alkali at a mild temperature, followed by high-pressure homogenization. Under the optimized conditions (2% sodium hydroxide, 0 °C, 48 h), SNFs with diameters of 8–42 nm and lengths of 0.9 ± 0.3 μm were prepared with yields higher than 75%, which retained the natural structures at the nanoscale and some inherent properties of silk fibers. Interestingly, SNFs can be used as a stabilizing matrix to assist carbon nanotubes (CNTs) to disperse, aiming to form a uniform and stable CNT/SNF dispersion. Thereafter, a strong and flexible conductive composite film was fabricated with good mechanical properties. The composite film showed good piezoelectric properties and electric thermal response, which has promising application prospects for SNFs, such as in optical devices, nanoelectronics, and biosensors.
研究领域:
材料科学
·
生物材料学
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yan Liu,Yue Sun,Zheng Peng
Salicylic acid (SA) is an important chemical raw material, but its production process generates large amounts of phenol-containing hypersaline wastewater . Bipolar membrane electrodialysis (BMED) technology was proposed to remove Na 2 SO 4 from this wastewater and generate NaOH and H 2 SO 4 . The influences of initial pH in feed solution, current density, flow velocity, initial Na 2 SO 4 concentration and volume ratio on the BMED process were investigated. These findings revealed that pH had no significant effect on the desalination rate, but affected the migration of organics including phenol and SA. When the input current density was 40 mA/cm 2 , flow velocity was 4.0 cm/s and the volume ratio was 2:1, the concentrations of H 2 SO 4 and NaOH could reach the maximum at 0.97 mol/L and 1.56 mol/L respectively, with initial Na 2 SO 4 concentration of 80 g/L and corresponding to a desalination rate of 96.3%. The current efficiency of acid was 55.2% and that of base was 50.2%, and energy consumption was 2.89 kWh/kg H 2 SO 4 and 3.98 kWh/kg NaOH. These results confirmed BMED technology could treat simulated SA wastewater effectively and produce H 2 SO 4 and NaOH. It provides a theoretical basis and guidance for the practical treatment of this type of wastewater.
研究领域:
环境工程
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化学工程
·
废水处理
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DOI
高影响因子
SN Applied Sciences
·
2021
·Vol. 3
·期 1
·1-10
·
IF 0
Li Yaxing,Yuan Shenfu
In this study, humic acids (HAs) were extracted from Chinese lignite by adding KOH to a NaOH solution. The extraction yield of HAs was found to improve because of the synergistic effect imparted by the alkali mixture of sodium hydroxide (NaOH) and potassium hydroxide (KOH). The maximum yield was obtained at 150 min by adding the mixture of 0.750 M NaOH + 0.710 M KOH to Xianfeng lignite at 80 °C. The potassium (K), sodium (Na), nitrogen (N), oxygen (O), and iron (Fe) contents were determined by X-ray diffraction, scanning electron microscopy, and proximate and ultimate analysis. The oxygen-containing functional groups in HAs were identified by Fourier transform infrared spectroscopy. The addition of KOH resulted in higher oxygen/carbon and nitrogen/carbon ratios and oxygen-containing functional groups, as compared with that in NaOH alone. The extractants containing KOH could release HAs with a higher proportion of K, Fe, N contents, which is beneficial for HAs fertilizers prepared from the lignite. The release of the nutrients (K, Fe, N) which are essential for the crops is determined by the KOH dosages.
研究领域:
化学
·
农业科学
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DOI
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Cuiwen Jiang,Feiyan Yan,Yuanxin Qin,Jing Liang,Liping Xie,Yanli Wang,Tao Li,Jing Wang,Lufei Zheng,Yu Ya
In this study, a stable and sensitive acetylcholinesterase biosensor was developed for the electrochemical determination of 3-nitropropionic acid (3-NPA). To this end, NaOH etching was used to activate the surface of the glassy carbon electrode, and the morphologies and electrochemistry properties of the resulting electrodes were characterized by various analytical methods. The results indicated dramatic enhancement in the electrochemical properties of electrodes by NaOH etching. As a result, the etched electrodes were applied as novel platforms for the immobilization of acetylcholinesterase. Accordingly, a sensor based on inhibition of 3-NPA toward the activity of acetylcholinesterase was constructed for the electrochemical determination of 3-NPA. Under the optimal conditions, the inhibition rate was found to be proportional to the logarithm of the concentration of 3-NPA from 0.1 to 30 μg/L, and the limit of detection was recorded as 0.05 μg/L. In comparison to conventional detection method, the fabricated biosensor also has added advantages in the form of easy and convenient operation, high sensitivity and better linear range.
研究领域:
分析化学
·
生物传感技术
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DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Yu-Lu Wang,Ji-Feng Zheng,Shuai Yan,Yue-Yuan Ye,Shui-Rong Li,Duo Wang,Yun-Quan Liu
A novel liquefaction method was developed for transforming different types of biomass, such as fir, bamboo, pine, and corncob, into bio-oil efficiently with Raney nickel (R-Ni) and NaOH as combined catalysts in a 2-propanol/H2O system, which was carried out in a 50 mL stainless-steel autoclave at 245 °C, corresponding to the working pressure maintained at 8 MPa. The conversion of biomass could reach 97–99%. Besides, a high bio-oil yield of 63.98% and higher heating value of 30.09 MJ/kg were achieved when fir was used as the feedstock. The gas chromatography–mass spectrometry analyses indicated that the major compounds in bio-oils were phenols, followed by acids, alcohols, ketones, and hydrocarbons, which were mainly light-weighted molecules with low boiling points measured by thermogravimetric analysis. Additionally, the R-Ni catalyst could be repeatedly used at least 5 times without the loss of activity.
研究领域:
化学工程
·
生物能源
·
催化
·
可再生能源
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qiang Liu,Siming Zhu
This study proposes a novel and feasible dissolution and fractionation method of depectinated sugar beet pulp (SBP) in NaOH/Urea/H 2 O, ionic liquid (IL) and alkaline treatment processes. Interestingly, the complicated structure of SBP can be treated with 30 % H 2 SO 4 to increase the dissolution rate. Scanning electron microscope (SEM) analysis confirmed that the appearance of cellulose and hemicellulose obtained by two methods were different. At the same time, two lignin fractions showed irregular high-density clusters, which were composed of a large number of submicron particles. The crystal structure of two cellulose fractions changed from cellulose I to cellulose II. The thermal stability of cellulose and lignin obtained by ionic liquid was slightly better than that obtained by NaOH/urea/H 2 O. Results of Fourier transform infrared (FTIR) and 13 C NMR showed that the chemical structures of SBP cellulose, hemicellulose and lignin regenerated from NaOH/urea/H 2 O and ionic liquid were similar.
研究领域:
生物化学
·
材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sheng-Jin He,Jia-Pei Chen,Wei-Ming Guo,Xiu-Bing Chen,Huan Zhou,Chuang-Tian Zhan,Shi-Kuan Sun,Yun Li,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
In this study, CaO–Al 2 O 3 –MgO–SiO 2 glass was utilized to join SiC after surface polishing and etching, without the application of pressure. To join polished SiC at 1250 °C using CaO–Al 2 O 3 –MgO–SiO 2 glass proved unsuccessful. However, when polished SiC was joined at 1350 °C, the joint shear strength was 108.0 ± 15.5 MPa. Etching polished SiC with a NaOH–K 3 [Fe(CN) 6 ] solution effectively removed surface carbon, resulting in numerous micro-pits, that increased the joining area and improved the wettability of CaO–Al 2 O 3 –MgO–SiO 2 glass. The joint strengths of etched SiC joined at 1250 °C and 1350 °C were 29.0 ± 11.6 MPa and 125.1 ± 19.6 MPa, respectively. After ablation at 1200 °C for 10 min, the retained strength of the etched joints (joined at 1350 °C) was 61.9 ± 4.0 MPa, whereas the strength of the polished joints decreased to only 36.6 ± 10.7 MPa. Surface etching demonstrates the potential to significantly enhance the strength and high-temperature resistance of SiC joints.
研究领域:
材料科学
·
陶瓷工程
·
表面工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Huidong Liu,Guoren Xu,Guibai Li
In this study, two different kinds of pharmaceutical sludge activated by NaOH were used to prepare biochar. The characteristics of biochar prepared by impregnation method and dry mixing method were analyzed, including N 2 adsorption–desorption isotherms, surface functional group analysis and micromorphological observation. The results showed that the biochar prepared by impregnation method had more micropores, while that prepared by dry mixing activation method had more mesopores . The adsorption reaction of tetracycline on the two different kind of biochar was investigated. Several important factors such as solution initial pH, tetracycline concentration and reaction time on adsorption reaction were investigated. The results show that both kinds of biochar have high tetracycline adsorption efficiency and excellent pH adaptability. The biochar manufactured by dry mixing activation method had better adsorption performance (379.78 mg/g, 25 °C). Regeneration experiments showed that the adsorbent had stable performance in absorbing tetracycline. Direct dry mixing activation method is a simple and effective method used to prepare porous biochar, which can be used for the resourceful utilization of pharmaceutical sludge. This work provides extensive information on the use of biochar derived from pharmaceutical sludge for the removal of TC from hospital and pharmaceutical production wastewater.
研究领域:
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shaoyang Liu,Jie Qi,Keting Yan,Jingru Liu,Zhenyu Hao,Lihua Sui,Yuanqiang Zhu,Hongsheng Lu
One of the challenges of CO 2 switchable hydrophilic solvents in the sustainable recovery of total petroleum hydrocarbons (TPH) from contaminated sands was the long recovery cycle. Herein, a CO 2 /NaOH switchable hydrophilic solvent, thymol was developed while specific reaction modes were investigated by quantum chemical calculations. The hydrophilic transition of thymol was triggered by NaOH solution at 25 ℃ and 1 atm, followed by regeneration through CO 2 bubbling. The time required for regeneration of thymol was reduced by 81.20 % compared to the conventional CO 2 switchable hydrophilic solvent N, N-dimethylcyclohexylamine, because of the high CO 2 reactivity of thymol revealed by the analysis of LUMO-HOMO and electrostatic potential. Thus, the concept of sustainable treatment of contaminated sands using thymol was proposed, achieving a TPH recovery of 87.63 %. We found that the solution of hydrophilic deep eutectic solvents (DESs/H 2 O) attributes to enhance the TPH recovery of thymol. Such synergy mechanism of DESs/H 2 O and thymol was revealed by molecular dynamics simulations. The optimal TPH recovery efficiency was 94.52 % after optimization by single variable experiment, Plackett-Burman design, the path of steepest ascent method and response surface methodology. The reusability of thymol and DES/H 2 O achieved a TPH recovery of 91.26 % after three cycles.
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PubMed
高影响因子
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