COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
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
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2021
·
IF 5.279
Pengfei Liu,Jiaojiao Zhang,Yan Qiao,Xianglin Hou,Yu Liu,Yingxiong Wang
Using environment-friendly catalysts to convert biomass into compounds with high values is one of the central topics of green chemistry. In this work, [Ch][Pro] (cholinium as the cation and l-proline as the anion) ionic liquid was synthesized and applied as a model catalyst in the production of deoxyfructosazine (DOF) and fructosazine (FZ) from d-glucosamine (GlcNH2). The 13C NMR chemical shift titration experiments and the diffusion-ordered NMR spectroscopy (DOSY) measurements showed that, when the [Ch][Pro] interacted with GlcNH2, the l-proline anion ([Pro]−) played a major catalytic role instead of cholinium cation ([Ch]+). The effects of the reaction temperature and the amount of [Ch][Pro] on the product yields were surveyed. The experimental results showed that the highest DOF yield (33.78%) was obtained after 30 min at 100 °C when the molar ratio of [Ch][Pro]/GlcNH2 was 1. Moreover, in situ1H NMR and in situ13C NMR experiments were applied to monitor the reaction process with [Ch][Pro] as the catalyst. The reactive intermediate, dihydrofructosazine, was clearly detected by these in situ techniques. Accordingly, a possible reaction pathway was proposed. By applying other amino acids as the anions, we also prepared five other [Ch][AA] ionic liquids, and they showed different catalytic activities and selectivity in the GlcNH2 self-condensation reaction.
研究领域:
绿色化学
·
催化化学
·
生物质转化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Mengjie Wu,Hui Ma,Zhongyi Ma,Yufang Jin,Chunyan Chen,Xiaoya Guo,Yan Qiao,Christian Marcus Pedersen,Xianglin Hou,Yingxiong Wang
Deep eutectic solvents (DESs) exhibit similar physicochemical properties to the ionic liquids. They are inexpensive, renewable, nontoxic, and environmentally benign solvents and have gradually attracted attention in several fields, for example, biorefinery. Here choline chloride-based DESs have been used as solvents and catalysts for the preparation of deoxyfructosazine (DOF) through a self-condensation reaction of d-glucosamine (GlcNH2). The catalytic performances of a “green cocatalyst”, amino acids, and the reaction mechanism were also studied. The results displayed that choline chloride/urea was capable to convert GlcNH2 efficiently, with a 13.5% yield of DOF at low temperature and with a short reaction time (100 °C, 150 min). Among the screened amino acids, arginine showed the highest activity and gave the highest yield of DOF (30.1%) under the optimized reaction conditions. Nuclear magnetic resonance (NMR) studies revealed a strong hydrogen bond interaction between GlcNH2 and arginine. Moreover, a detectable intermediate, namely dihydrofructosazine, in the condensation of GlcNH2 to DOF/fructosazine (FZ) was captured by in situ NMR technique.
研究领域:
有机化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 14
·11334-11340
·
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
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 29
·4792-4798
·
IF 4.776
Jianwen Hou,Runhai Chen,Jingchuan Liu,Haozheng Wang,Qiang Shi,Zhirong Xin,Shing-Chung Wong,Jinghua Yin
We have developed a 3D smart binary polymer-brush pattern on the polymer substrate for inducing multiple cell microarrays aided by a lectin and temperature. The binary polymer-brush pattern composed of poly(N-isopropylacrylamide) (PNIPAM) and poly(D-gluconamidoethyl methacrylate) (PGAMA) brushes is fabricated by combining the photolithography technique with a surface-initiated photo-polymerization (SIPP) method. We demonstrate that well-defined binary polymer-brush patterns with high resolution are fabricated using this facile method. The patterned hierarchical PNIPAM brushes exhibit reversible switching to the adhesion of red blood cells (RBCs) induced by thermo-responsiveness. The PGAMA brush domains resist adhesion of RBCs but bind specifically with concanavalin A (Con A), forming a lectin pattern to capture RBCs in a site-specific manner. Therefore, multiple cell microarrays on a single platform are generated with the aid of Con A and temperature. This novel platform composed of a smart binary polymer-brush pattern is versatile and specific, which opens up pathways to potential applications such as microsensors, biochips and bioassays.
研究领域:
材料科学
·
生物材料
·
生物技术
·
细胞生物学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Yuanyang Zhang,Xiaoping Liang,Tao Jiang,Zishang Chen,Xiujie Ji
Waste water with boron is a widespread environmental problem. This work presents a kind of novel organic-inorganic composite boron adsorbent of NGN, N-methyl- D -glucamine (NMDG) @γ-glycidoxypropyl-trimethoxysilane (GPTMS) on the nonwoven basalt fibers (NBF), which is environmentally friendly, water resistance, non-toxicity and low cost. The effect of various parameters on the adsorption performance of NGN, such as pH value, boron concentration, contact time and different ion concentrations, was investigated. The optimum adsorption capacity of 1.64 mmol/g occurred in the vicinity of pH 9.0, and NGN possessed the fast adsorption equilibrium of boron within 40 min. In the presence of competing ions, Na + and Li + had little effect on the adsorption of boron, while Mg 2+ promoted the adsorption of boron. The features of NGN adsorption process were assessed by Langmuir and Freundlich adsorption isotherms . The experimental data of NGN boron adsorbent was well described by using the pseudo-second-order kinetic model. In addition, after eight times adsorption-desorption cycles, NGN still featured excellent regeneration performance. All the experimental results illustrate that NGN could be efficiently utilized for separating and recycling boron from aqueous solutions.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）