RSC Advances
·
2019
·Vol. 9
·期 48
·28248-28252
·
IF 3.049
Yumin Leng,Fang Hu,Chunhua Ma,Chenxi Du,Linfeng Ma,Jiao Xu,Qiyuan Lin,Zhipei Sang,Zhiwen Lu
A simple, rapid, sensitive, selective and label-free method is presented for the colorimetric determination of lincomycin (Lin) by using HAuCl4 and NaOH. Upon the addition of Lin, the mixture of HAuCl4 and NaOH shows a color change from colorless to blue (or dark blue). The limit of colorimetric detection is as low as 1 μM, observed both in Milli-Q water and real samples. The selectivity of Lin detection is excellent compared with 9 other common antibiotics. On the basis of the “three-color” principle of Thomas Young, we extracted the red, green and blue (RGB) alterations of the sensor in the absence and presence of different concentrations of Lin. The color changes are quantitatively illustrated by the total Euclidean distances (EDs = [ΔR2 + ΔG2 + ΔB2]1/2). The good linear relationship between the EDs and Lin concentration is used for the quantitative assay of Lin. The developed method demonstrates great potential for the detection of Lin in environmental water and milk.
研究领域:
分析化学
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环境科学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Weiwei Huang,Xiaozhen Lu,Wenzong Zhou,Weiwei Lv,Quan Yuan,Hang Yang,Xinwei Kang,Daoji Wu,Lin Wang,Xuewu Zhu
Polyamide (PA) nanofiltration (NF) membranes are promising for diverse water treatment applications, particularly due to their high permeability, selectivity, and inherent antifouling properties. These NF membranes are highly sought after delivering high-quality drinking water. The development of high-performance NF membranes through interfacial polymerization (IP) requires careful optimization of heat treatment and post-treatment processes. In this study, we integrated these steps to establish an optimized heat treatment strategy utilizing post-treatment solutions. Systematic investigations revealed that the use of NaOH as a heating reagent etched the PA layer while promoting the hydrolysis of chloride groups, resulting in NF membranes with enhanced negative charge, improved hydrophilicity, and increased pore size. The optimized Post-3 demonstrated exceptional performance, with a permeability of 29.3 LMH/bar while achieving a remarkable 97.3 % removal efficiency for Na 2 SO 4 . The Post-3 exhibited excellent selectivity for both monovalent and multivalent ions, making it ideal for advanced water treatment applications. Furthermore, during natural surface water purification, the Post-3 effectively removed organic compounds while retaining moderate mineral content, ensuring the provision of safe drinking water with optimal mineral composition. The study also highlighted the outstanding fouling resistance and long-term stability of the Post-3, offering valuable insights into the customization of NF membranes for advanced drinking water treatment systems.
研究领域:
材料科学
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水处理工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2014
·
IF 2.122
Mengzhu Liu,Yongpeng Wang,Zhiqiang Cheng,Lihua Song,Mingyue Zhang,Meijuan Hu,Junfeng Li
Mixture of polylactide (8 wt%), zinc acetate (6 wt%) and hexafluoroisopropanol was first used as electrospinning solution to fabricate ZnO nanofibers. Unfortunately, after direct calcination of the precursor polylactide/zinc acetate nanofibers, only ZnO film was prepared. Surprisingly, when the precursor fibers were pre-hydrolyzed with NaOH, ZnO nanofibers with diameter of 678 nm were obtained. The mechanism analysis showed that the preserve of fiber structure was attributed to the formation of zinc polylactic acid in the process of hydrolyzation. After characterized by scanning electron microscope and transmission electron microscope, the ZnO film was found to be an aggregation of irregular nanoparticles and the ZnO nanofiber was a necklace-like arrangement of cylindrical grains. X-ray diffraction and photoluminescence measurements indicated that the crystalline quality of the ZnO nanofibers was higher than the film. Furthermore, photocatalytic performance of the ZnO samples was investigated. Comparing with ZnO film, ZnO nanofibers exhibited much higher activity.
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
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Jianwei Li,Xiang Li,Yan Liu,Jie Zhang
The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac] − > [OH] − ≈ [Br] − > [BF 4 ] − . The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac − ionic liquids and NaOH (aq) at a volume ratio of 40:1 ( V (oil): V (ionic liquid)) and a short equilibrium time within 10 min.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Binzhe Sun,Gege Peng,Lian Duan,Aihua Xu,Xiaoxia Li
A simple pretreatment method, NaOH swelling at a low temperature and then HCl regeneration, was developed for depolymerization of cellulose to glucose. Cellulose was transformed into amorphous hydrogel during the treatment; and due to the easy diffusion of H + and Cl − ions into the cellulose hydrogel network as well as the strong ability of Cl − to disrupt the massive hydrogen bond, the hydrolysis rate was greatly enhanced. The method is effective for α-cellulose, microcrystalline cellulose, filter paper, ramie fiber and absorbent cotton. Even at a high α-cellulose concentration of 50 g/L, 29.1% yield of glucose was still obtained within 10 min at 160 °C under microwave irradiation, where up to 16.2 g/L of glucose solution was given. The influence of NaOH concentration, HCl concentration, hydrolysis temperature and time on the hydrolysis rate was investigated. The structure of cellulose hydrogel was also studied to confirm the reaction mechanism.
研究领域:
生物化学
·
可再生能源
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2016
·Vol. 92
·期 4
·827-833
·
IF 2.738
Jinxi Feng,Shenyu Lan,Chunyang Yao,Ya Xiong,Shuanghong Tian
BACKGROUND Electro-generation of NaOH and H 2 SO 4 with organic compound-free Na 2 SO 4 wastewater has been known for many years, but actually, lots of Na 2 SO 4 wastewater contains organic pollutants, such as black liquor, dyeing and sulphonating wastewater etc., therefore, there is a strong demand for investigations on performance and effect of the organic pollutants in electrochemically splitting Na 2 SO 4 into H 2 SO 4 and NaOH from these wastewaters. RESULTS Co-electrolysis of Na 2 SO4 (1.13 mol L −1 ) and AO7 (50 ∼ 500 mg L −1 ) was investigated in a diaphragm cell with IrO 2 -coated Ti electrodes. It was found that the concentrations of the resulting NaOH and H 2 SO 4 could remain at about 0.73 mol L −1 and 0.36 mol L −1 , respectively, although the COD removal was increased from 50.3 mg L −1 to 166.3 mg L −1 with the increase of AO7 concentration, for 120 min. CONCLUSION In a diaphragm cell with IrO 2 -coated Ti electrodes, NaOH and H 2 SO 4 could be effectively generated, and simultaneously, AO7 could also be degraded for the wastewater containing Na 2 SO 4 and AO7. Interestingly, the electro-generation of NaOH and H 2 SO 4 was not significantly affected by the occurrence and degradation of AO7 in the range 0–500 mg L −1 . The phenomenon of constant acid–base yield contributed to the independence of the main acid-generating reactions on the electro-oxidation of AO7. © 2016 Society of Chemical Industry
研究领域:
环境科学
·
电化学工程
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DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xianjie Li,Bingxiao Feng,Hailin Zhang,Yaping Liu,Meng Xiao,Tingting Huang,Quanhong Zhu,Hongbing Song
Furfural, a key biomass-derived compound, can be transformed into high-value chemicals, including methyl furoate, through oxidative esterification. This process finds broad applications across various industries. In the current study, gold nanoparticles were deposited on γ-Al 2 O 3 pretreated with NaOH etching, utilizing the urea deposit-precipitation method followed by reduction in a hydrogen atmosphere. This approach resulted in a highly active Au catalyst, which was thoroughly characterized using multiple analytical techniques. The optimization of NaOH etching enhanced the pore structure and improved the dispersion of the active metal on the support. Notably, the Au/γ-Al 2 O 3 -2 catalyst, prepared with a 2-hour etching duration using 1 M NaOH, exhibited uniformly dispersed gold nanoparticles with an average size of 2.8 nm. The smaller particle size and enhanced dispersion of these Au nanoparticles significantly contributed to the catalyst’s superior catalytic activity and recyclability. Under optimized reaction conditions, the Au/γ-Al 2 O 3 -2 catalyst achieved nearly complete conversion of 1 mmol of furfural to methyl furoate within 4 h, with both conversion and selectivity exceeding 99 %. The study also proposed a mechanism for the oxidative esterification of furfural to methyl furoate catalyzed by Au/γ-Al 2 O 3 -2. Additionally, the catalyst’s effectiveness in the oxidative esterification of various substrates was investigated, demonstrating its robust activity for aromatic aldehydes and alcohols. This broadens the potential applications of the catalyst in the synthesis of diverse valuable esters.
研究领域:
催化化学
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生物质转化
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Binpeng Zhang,Dongjie Yang,Huan Wang,Yong Qian,JinHao Huang,Lixuan Yu,Xueqing Qiu
Enzymatic hydrolysis lignin (EHL), from straw bioethanol process, was activated using NaOH/urea aqueous solution under low temperature condition to enhance its sulfonation degree and dispersion property. The sulfonation degree of EHL increased by 62.60% after the activation of NaOH/urea aqueous solution at −10 °C for 12 h, which is resulted from the breakage of the hydrogen bonds and ether bonds in lignin–carbohydrate complexes (LCCs) and the removal of residual carbohydrate. The functional group content, 2D-HSQC, and AFM analysis indicated that the increase of phenolic groups and the weakened aggregation degree of EHL after the activation are in favor of the increase of activity sites and decrease of steric hindrance, which is beneficial to the enhancement of sulfomethylation reactivity. Owing to the enhancement of reactivity, the dispersion properties of sulfomethylated EHL on graphite suspension were significantly enhanced.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Kai Qi,Zhenzhen Jin,Dan Wang,Zhenyu Chen,Xingpeng Guo,Yubing Qiu
The degradation of electrochemical activity is the inevitable and noticeable issue in the widespread applications of conducting polypyrrole (PPy), which involves chemical and electrochemical reactions in PPy natural degradation processes. Based on thorough insights into PPy degradation behavior, this work develops a method of theoretical derivation for the natural degradation kinetics model of PPy, which is verified in NaOH aqueous electrolytes and could be further generalized in other media. The kinetics model derives the rate equations of the chemical and electrochemical processes ( v c and v e ) in PPy degradation. The relationships of the electroactivity degradation rate constant ( k deg ) and rate constants of the chemical and electrochemical processes ( k c and k e ) as well as reaction orders of PPy n+ and OH − are established through theoretical deduction. The effects of doping anions in PPy, film thickness, and electrolyte temperature on the degradation kinetics are investigated through theoretical considerations and experimental findings. The degradation level and service failure time of PPy can be effectively predicted using the kinetics model. Establishing the degradation kinetics model would signal the new perspective and depth in comprehensive studies of PPy degradation, finally facilitating the optimization of performance management in PPy practical applications.
研究领域:
材料科学
·
电化学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Feng-Ping Wang,Jing-Jing Li,Yu Zhang,Mei-Yan Sun,Li Li,Fazli Wahid,Yan-Yan Xie,Shiru Jia,Wenchao Li,Cheng Zhong
The cellulose dissolution is conducive to converting it into higher value-added cellulose products. However, conventional cellulose solvents possess several drawbacks, such as high cost and harsh reaction conditions. In this study, a new strategy that combined 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation and a zincate–NaOH system was proposed for cellulose solubilization. The results showed that TEMPO-mediated oxidation increased the hydrophilicity of cellulose, destroyed the surface and amorphous areas of the fiber, and facilitated solvent access to its crystalline regions in the subsequent treatment. Zn(OH)42– can be used as a stabilizer to prevent cellulose from agglomeration and form strong hydrogen bonds with cellulose to enhance cellulose dissolution. All-cellulose composites with antibacterial properties were prepared from cellulose using a partial dissolution method at room temperature. This preparation is simple and low cost, laying the foundation for its application in biomedicine.
研究领域:
化学工程
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analytical Methods in Chemistry
·
2014
·
IF 0.948
Hongzhi Hu,Ying Liang,Shuo Li,Qing Guo,Chancui Wu
In the existence of appropriate amount of disodium ethylenediaminetetraacetate (EDTA), precipitation would not occur in seawater and other natural waters even if the sample solution was adjusted to strong basicity, and the NH3-OPA-sulfite reaction at the optimal pH range could be used to determine ammonium in natural waters. Based on this, a modified o-phthalaldehyde fluorometric analytical method has been established to determine ultratrace ammonium in natural waters. Experimental parameters, including reagent concentration, pH, reaction time, and effect of EDTA, were optimized throughout the experiments based on univariate experimental design. The results showed that the optimal pH range was between 10.80 and 11.70. EDTA did not obviously affect the fluorometric intensity. The linearity range of the proposed method was 0.032–0.500 µmol/L, 0.250–3.00 µmol/L, and 1.00–20.0 µmol/L at the excitation/emission slit of 3 nm/5 nm, 3 nm/3 nm, and 1.5 nm/1.5 nm, respectively. The method detection limit was 0.0099 µmol/L. Compared to the classical OPA method, the proposed method had the advantage of being more sensitive and could quantify ultratrace ammonium without enrichment.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Carbon Letters
·
2023
·Vol. 33
·期 4
·1205-1215
·
IF 4.5
Yang Mannan,Fang Changqing,Su Jian,Zeng Huilin,Lin Qilang
In this study, waste corrugated paper was used as carbon precursor with KOH-NaOH mixture (mole ratio was 51:49 and the melting point is 170 °C) as activator to prepare porous carbon at different reaction temperature and different mass ratio of KOH-NaOH mixture/waste corrugate paper fiber. The micro-morphology, pore structure information and composition of porous carbon were analyzed, and the formation mechanism of pores was investigated. The effect of activator amount and pyrolysis temperature on the morphology and structure of porous carbon were studied. The adsorption capacity of porous carbon was evaluated with the methylene blue as model pollutant. The effect of adsorbent amount, adsorption time and temperature on the adsorption performance of the porous carbon were analyzed. The maximum specific surface area is 1493.30 m 2 ·g −1 and the maximum adsorption capacity of methylene blue is 518 mg·g −1 . This study provides a new idea for efficient conversion and utilization of waste paper. Graphical abstract
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
危险品化学品经营许可证（带存储）