COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Chun Bai,Kexin Li,Dezhen Fang,Xiushen Ye,Huifang Zhang,Quan Li,Jun Li,Haining Liu,Zhijian Wu
A novel flotation agent named N-octadecyl-N-methyl- D -glucamine (NO-NMDG), was designed and prepared using N-methyl- D -glucamine as a polyhydroxy molecule and 1-bromooctadecane as the provider of a long-chain alkyl group . The results of characterization by NMR, MS and FT-IR showed that the target compound was successfully synthesized. NO-NMDG can effectively separate boron from aqueous solutions because of its complexing ability for boron and its foamability. The flotation experiments results showed that the flotation isotherm was in better accordance with the Langmuir model, indicating that the surface reaction in flotation by NO-NMDG belongs to the single molecular layer trapping. The response surface experimental results indicated that under the optimum conditions, the boron recovery rate can reach to 89.12%. The boron recovery rate in Xiao Chaidan brine could reach to 97.26% by NO-NMDG. The mechanism analysis exhibited that the meglumine group in NO-NMDG can complex with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer to separate boron from the aqueous solution.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Chun Bai,Kexin Li,Yanping Wang,Haining Liu,Huifang Zhang,Quan Li,Jun Li,Xiushen Ye,Zhijian Wu
ABSTRACT A novel boron flotation agent (N-2-hydroxyoctadecyl-N-Methylglucamine, NHO-NMDG) was fabricated using 1,2-epoxyoctadecane and N-methyl-D-glucamine. The obtained collector possesses both collecting and foaming properties and it was characterized by nuclear magnetic resonance, mass spectrometry, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy methods. The flotation performance for boron removal from the salt lake brine has been studied. The flotation experiments indicated a highly effective removal of boron from the salt lake brine. The boron removal rate in the Da Qaidam brine could reach 67.08% by NHO-NMDG. The mechanism analysis shows that the meglumine group in the bifunctional flotation agent can be complexed with boron, and the long-chain alkyl group can attach to the surface of the bubble and enter into the bubble layer, so as to separate boron from the aqueous solution.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Xueri Nan,Jing Liu,Xiuli Wang,Xianhui Pan,Xiaomei Wang,Xu Zhang
Three-dimensionally ordered macroporous cross-linked poly(glycidyl methacrylate) (3DOM) was constructed by water-soluble colloidal crystal templates and further functionalized with N-methyl-d-glucamine (NMDG) to prepare superhydrophilic adsorbents for boron removal from natural seawater. 3DOM adsorbents possess features of interconnected macropore structure, ultrathin pore wall, and superhydrophilicity, making efficient adsorption possible. The effect of cross-linking degree on the adsorption capacity toward boron was investigated. The NMDG-modified 3DOM adsorbent with rich vicinal diol functional groups showed superhydrophilicity and outstanding performance of adsorption. Significantly, its adsorption effect in boron removal from natural seawater indicated that the concentration of boron in natural seawater could decline to 0.16 from 4.24 mg·L–1 when the adsorbent dosage was 1 g·L–1, whereas the boron rejection reached 96.2%. After 10 regeneration–adsorption cycles, the adsorption capacity of 3DOM adsorbent remained over 85% of the initial value and the ordered structure was hardly changed. Additionally, 3DOM adsorbent could be directly and quickly separated from the seawater by a filter mesh of 16 mesh number. Research shows that the 3DOM adsorbent exhibits an adsorption performance for practical applications in boron removal from natural seawater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Xi Zhang,Jiawei Wang,Shaofeng Chen,Zongbi Bao,Huabin Xing,Zhiguo Zhang,Baogen Su,Qiwei Yang,Yiwen Yang,Qilong Ren
Preparation of a novel hybrid boron-selective adsorbent with N- methyl- d -glucamine functional groups was reported. The adsorbent was synthesized by inverse suspension polymerization method based on chemistry of sol-gel reaction. The structure and morphology of the hybrid adsorbent were characterized by MS, FTIR, XPS, BET analysis and PXRD , etc. The perfectly spherical hybrid adsorbent exhibits exceptionally efficient adsorption of boric acid from the aqueous solution. The boron adsorption behavior on the adsorbent was investigated by varying the dosages of the adsorbent, pH, and competitive ions. The adsorption isotherm was in better accordance with the Langmuir model, exhibiting a theoretical maximum adsorption capacity of 2.02 mmol/g. The adsorption capacity peaks at pH ∼ 9 due to the vast formation of stable tetrahedral structure between dominant B(OH) 4 − and the adsorbent. The presence of Na + ions has slight effect on boron adsorption while Mg 2+ cations significantly enhanced the adsorption capacity because of the simultaneous adsorption attributed by Mg(OH) 2 .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2021
·
IF 5.485
Zhe Wang,Kaiyuan Ma,Yufeng Zhang,Xinbo Zhang,Huu Hao Ngo,Jianqiang Meng,Lingzhong Du
Removing micro-pollutants is an important global challenge for the development of good adsorbents and environmental engineering issues. In this work, the structure of hierarchically and interconnected porous polymer has been fabricated by a high internal phase emulsion (HIPE) with water-in-oil and used for removing boron from water. This porous polymer was synthesized via monomer radical polymerization and utilized the active sites of monomer –Cl. In this way the vicinal hydroxyl group of N-Methyl- d -glucamine (NMG) was successfully introduced and grafted into HIPE by nucleophilic substitution reaction under the catalysis of triethylamine. The maximum boron uptake capacity was 2.54 mmol/g at a boron concentration of 100 mg/L, and reached adsorption equilibrium after about 2 h. Compared to traditional adsorption membrane materials, the HIPE porous polymer had better mechanical strength and able to resist acid and alkaline in the long-term. Meanwhile the regeneration efficiency of the HIPE30 %-g-PNMG porous polymer remained at 100 % after being used for 10 cycles.
研究领域:
环境工程
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材料科学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2023
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IF 3.8
Hui Jiang,Zijian Zhao,Ning Yu,Yi Qin,Zhengwei Luo,Wenhua Geng,Jianliang Zhu
Using N -methyl-D-glucosamine (NMDG) as the functional monomer , glycidyl methacrylate (GMA) as the connecting monomer, functionalized Fe 3 O 4 nano-particles (NPs) as the support, three adsorbents were prepared including direct polymer GMA-NMDG, magnetic GMA-NMDG polymer (MGN), and boron magnetic ion-imprinted polymer (BMIIP). Based upon the optimization of synthesis conditions, the prepared adsorbents and intermediate products were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscope, energy dispersive spectroscopy, X-ray diffraction, vibrating sample magnetometer, and Brunauer–Emmett–Teller to investigate the synthesis process, the morphological structure and the functional properties of the materials. The optimum performances of GMA-NMDG, MGN and BMIIP were obtained in the initial neutral solution (pH of 6.5). Moreover, GMA-NMDG and MGN reached the maximum adsorption capacity at 120 min, whereas BMIIP reached adsorption saturation at 60 min. The pseudo-second-order kinetic model was more suitable for the adsorption of boron using the adsorbents. The maximum adsorption capacity of GMA-NMDG was found to be 43.4 mg·g −1 , while those of MGN and BMIIP were 32.5 and 28.3 mg·g −1 , respectively. The Langmuir isotherm model was more appropriate to describe the adsorption process . The adsorbents maintained satisfactory adsorption performance within a certain temperature range. Competing ions had little effect on the adsorption of boron, and would be adsorbed simultaneously, due to which, the effect of co-adsorption can be considered. The adsorption capacity of GMA-NMDG was high, while the adsorption selectivity of BMIIP was much better. Furthermore, BMIIP showed good adsorption after five cycles of adsorption and desorption. The comparison of adsorbents showed that GMA-NMDG had the highest adsorption capacity and was suitable for co-adsorption. MGN had a high adsorption capacity, good comprehensive performance and magnetic properties. BMIIP had better adsorption rate, adsorption selectivity and recyclability. Through the optimization of synthesis conditions, the adsorption capacity of the traditional monomer NMDG polymer was increased, and the magnetism was given to facilitate rapid recovery. Combined with the ion imprinting technology, it showed higher boron adsorption selectivity in the presence of competitive ions.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Systems Microbiology and Biomanufacturing
·
2022
·Vol. 2
·期 3
·507-522
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IF 0
Du Juanjuan,Zhang Liang
N -methyl- d -aspartic acid (NMDA), an amino acid existing in human and animal central nervous system, exerts agonist action on one of the glutamate receptor subtypes and is clinically used for treatment of diabetes, Parkinson’s and Alzheimer’s syndrome. In this study, an enzymatic protocol for the chiral resolution of N -methyl- d , l -aspartic acid was built with a predicted N -demethylase (GenBank ID: OJV90073.1) from the genome of Chloroflexi bacterium 54-19. Through sequence alignment, the enzyme shares an identity of 32.19% to 2UZZ (PDB ID) with a conserved catalytic center. Recombinantly expressed in Bacillus subtilis WB600 , the N -demethylase was characterized with optimal temperature and pH at 55 ℃ and 7.5, and adaptive temperature and pH were 40–60 ℃ and 6–8. The effects of organic solvents and metal ions were investigated as well. Compared with other previously reported sarcosine oxidases, the enzyme showed a specific N -demethylation activity against N -methyl- l -aspartic acid according to the analysis by chiral liquid chromatography, LC–MS/MS and a detection by polarimeter. The results demonstrated 76% of 4.5 mM N -methyl- d , l -aspartic acid could be chirally separated by 7 mg·L −1 enzyme after reaction of 80 min. This work provided a foundation for mild synthesis of NMDA in industry. Graphical abstract
研究领域:
生物化学
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分子生物学
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微生物学
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药理学
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DOI
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 14
·11334-11340
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IF 3.201
Jingjing Kang,Yakun Tang,Shasha Gao,Lang Liu
In this research, a series of one-dimensional controllable crosslinked polymers with the different mass ratios of 4-vinylbenzychloride (VBC) and divinyl benzene (DVB) was prepared via cationic polymerization, and the polymers were grafted with the functional group N-methyl-D-glucamine (NMDG) for boron removal. The optimum polymeric mass ratio and a series of boron adsorption performances were studied. The maximum adsorption capacity was 18.15 mg g−1, of which 94% was retained after 4 cycles. Meanwhile, different pH values had negligible effect on the boron adsorption capacity, which was favorable for the removal of boron from its aqueous solution in a wide pH window. In addition, a magnetic adsorbent was prepared by the combination of Fe3O4 nanoparticles and the polymer, which provided an effective way to collect and recover adsorbents from their aqueous solutions.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2019
·
IF 0
Ji Fu Du,Zhen Dong,Xin Yang,Long Zhao
Glycidyl methacrylate (GMA) was grafted onto the surface of HDPE particles by radiation grafting and emulsion graft copolymerization. And subsequent ring-opening reaction of expoxy groups in poly-GMA graft chains with N-methylglucamine (NMG) was conducted to synthesis the boron adsorbent. The synthesis condition (radiation dose and NMG concentration) was optimized and characterized by IR and SEM. Adsorption behaviors of the boron adsorbent for boron removal presented that adsorption kinetics was well described by pseudo-second-order kinetic mode. The adsorption isothermal was well fitted with both Langmuir and Freundlich isotherm models. The adsorption capacity for boron reached 15.63 mg/g at optimal pH 8. Dynamic experiment revealed that boron could be efficiently adsorbed by the boron adsorbent and fully desorbed using 13 BV of 1 mol/L HCl.
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
TOXICOLOGY AND INDUSTRIAL HEALTH
·
2021
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IF 2.273
Chong Wang,Yao Shu,Li Xu,Qiling Liu,Bei Zhang,Hong Zhang
Bisphenol A (BPA), a component of polycarbonate and epoxy resins, has been reported to induce learning and memory deficits. However, the mechanisms have not been fully elucidated. Growing evidence has suggested that N-methyl-d-aspartate receptors (NMDARs) are involved in cognitive impairments. In this study, BPA was administered to female Sprague–Dawley rats (six per dose group) at concentrations of 0 (control), 4, 40, and 400 μg/kg·body weight/day from gestation day 1 through lactation day 21. Spatial learning was evaluated using the Morris water maze on postnatal day 22. Expression levels of NMDARs were determined using real-time polymerase chain reaction and Western blot. The results showed that male offspring exposed to BPA exhibited increased latency in reaching the platform and reduced time in the target quadrant, and the number of crossing the platform was less, as compared with the control group. The mRNA and protein expression levels of NMDARs in the hippocampus were significantly downregulated when compared with the control group of male offspring. The data showed that maternal exposure to BPA at low dosage can cause cognitive deficits in male rat offspring, probably due to a decrease in NMDARs in the hippocampus.
研究领域:
神经科学
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毒理学
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发育生物学
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DOI
PubMed
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2020
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IF 2.734
Qihong Zhang,Wei Ren,Alexandr V. Dushkin,Weike Su
Olmesartan medoxomil (OM) has been used in treatment of hypertension disease, as a prodrug of olmesartan. However, its clinical application is limited by the low oral bioavailability (~28%). Ternary solid dispersion of OM was prepared with hydroxypropyl- β -cyclodextrin and N -methyl- d -glucamine to improve its oral bioavailability using roll mill ML 007. Its physicochemical characterization was measured by scanning electron microscope, differential scanning calorimetry , powder X-ray diffraction and transform infrared spectroscopy . The solutions properties of OM in ternary solid dispersion were investigated involving the solubility, dissolution profiles, 1 H NMR analysis, phase solubility study and PAMPA study. Instrument analysis results revealed an amorphous solid dispersion had been synthesized without any side-products. It also showed enhanced solubility and dissolution rate in vitro . Pharmacokinetic study demonstrated an improved oral bioavailability in vivo . The rapid storage assay showed that the chemical stability of inclusion complexes had no change. The synthesized OM ternary solid dispersion is promising to be a better alternative to its pure formation in the market with improved oral bioavailability.
研究领域:
药剂学
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药物动力学
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药物传递系统
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Qiang Wu,Mingyan Liu,Xiong Wang
A new type of absorbent was synthesized by grafting N-methyl-D-glucamine (MG) onto the surface of chitosan beads to separate boron element. The physicochemical properties of modified chitosan beads (CTS-MG) were examined by FT-IR and SEM analyses. The results indicated that MG had grafted on chitosan beads (CTS) successfully. Compared to surface of pure CTS, CTS-MG had a rougher surface. While the pH value ranged 3–8, CTS-MG would have a high efficiency of adsorption to boron. The characteristics of the adsorption process were evaluated by Langmuir and Freundlich adsorption isotherms , and the maximum adsorption capacity of CTS-MG was 20.36 mg·g −1 . When mass of absorbent was not lower than 0.1 g, the concentration of 10 ml boron solution would decrease from 50 to 0.5 mg/L. This absorption process fit to the pseudo-second-order kinetic model. CTS-MG had a comparatively high selectivity because general competing ions had little influence on the absorptive ability of CTS-MG. After 5 times adsorption-desorption cycles, absorptive capacity of CTS-MS did not decrease obviously. CTS-MG was hopefully used in the process of boron desorption in salt lake brine.
研究领域:
材料科学
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环境化学
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水处理
✓ 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）