scholarly journals Chelating Fabrics Prepared by an Organic Solvent-Free Process for Boron Removal from Water

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1163
Author(s):  
Hiroyuki Hoshina ◽  
Jinhua Chen ◽  
Haruyo Amada ◽  
Noriaki Seko
Keyword(s):  
Aqueous Solution ◽  
Organic Solvent ◽  
Graft Polymerization ◽  
Gamma Ray ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Boron Removal ◽  
Batch Mode ◽  
Free Process ◽  
High Boron

A chelating fabric was prepared by graft polymerization of glycidyl methacrylate (GMA) onto a nonwoven fabric, followed by attachment reaction of N-methyl-D-glucamine (NMDG) using an organic solvent-free process. The graft polymerization was performed by immersing the gamma-ray pre-irradiated fabric into the GMA emulsion, while the attachment reaction was carried out by immersing the grafted fabric in the NMDG aqueous solution. The chelating capacity of the chelating fabric prepared by reaction in the NMDG aqueous solution without any additives reached 1.74 mmol/g, which further increased to above 2.0 mmol/g when surfactant and acid catalyst were added in the solution. The boron chelation of the chelating fabric was evaluated in a batch mode. Fourier transform infrared spectrophotometer (FTIR) was used to characterize the fabrics. The chelating fabric can quickly chelate boron from water to form a boron ester, and a high boron chelating ability close to 18.3 mg/g was achieved in the concentrated boron solution. The chelated boron can be eluted completely by HCl solution. The regeneration and stability of the chelating fabric were tested by 10 cycles of the chelation-elution operations. Considering the organic solvent-free preparation process and the high boron chelating performance, the chelating fabric is promising for the boron removal from water.

scholarly journals The two-step mechanochemical synthesis of porphyrins

2014 ◽  
Vol 170 ◽  
pp. 59-69 ◽  
Author(s):  
Hannah Shy ◽  
Paula Mackin ◽  
Andrea S. Orvieto ◽  
Deepa Gharbharan ◽  
Geneva R. Peterson ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Mechanochemical Synthesis ◽  
Bond Formation ◽  
Acid Catalyst ◽  
Solvent Free ◽  
Oxidizing Agent ◽  
Carbon Bond ◽  
Carbon Carbon Bond ◽  
Solvent Free Conditions ◽  
Porphyrin Synthesis

Porphyrin synthesis under solvent-free conditions represents the “greening” of a traditional synthesis that normally requires large amounts of organic solvent, and has hindered the industrial-scale synthesis of this useful class of molecules. We have found that the four-fold acid-catalysed condensation of aldehyde and pyrrole to yield a tetra-substituted porphyrin is possible through mechanochemical techniques, without a solvent present. This represents one of the still-rare examples of carbon–carbon bond formation by mechanochemistry. Specifically, upon grinding equimolar amounts of pyrrole and benzaldehyde in the presence of an acid catalyst, cyclization takes place to give reduced porphyrin precursors (reversible), which upon oxidation form tetraphenylporphyrin (TPP). The approach has been found to be suitable for the synthesis of a variety of meso-tetrasubstituted porphyrins. Oxidation can occur either by using an oxidizing agent in solution, to give yields comparable to those published for traditional methods of porphyrin synthesis, or through mechanochemical means resulting in a two-step mechanochemical synthesis to give slightly lower yields that are still being optimized. We are also working on “green” methods of porphyrin isolation, including entrainment sublimation, which would hopefully further reduce the need for large amounts of organic solvent. These results hold promise for the development of mechanochemical synthetic protocols for porphyrins and related classes of compounds.

scholarly journals Organic Solvent Free Process to Fabricate High Performance Silicon/Graphite Composite Anode

2021 ◽  
Vol 5 (7) ◽  
pp. 188
Author(s):  
Chen Fang ◽  
Haiqing Xiao ◽  
Tianyue Zheng ◽  
Hua Bai ◽  
Gao Liu
Keyword(s):  
Organic Solvent ◽  
High Performance ◽  
Low Cost ◽  
Solvent Free ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Composite Electrodes ◽  
Graphite Composite ◽  
Free Process ◽  
Composite Anodes

Cycling stability is a key challenge for application of silicon (Si)-based composite anodes as the severe volume fluctuation of Si readily leads to fast capacity fading. The binder is a crucial component of the composite electrodes. Although only occupying a small amount of the total composite mass, the binder has major impact on the long-term electrochemical performance of Si-based anodes. In recent years, water-based binders including styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) have attracted wide research interest as eco-friendly and low-cost alternatives for the conventional poly(vinylidene difluoride) (PVDF) binder in Si anodes. In this study, Si-based composite anodes are fabricated by simple solid mixing of the active materials with subsequent addition of SBR and CMC binders. This approach bypasses the use of toxic and expansive organic solvents. The factors of binder, silicon, and graphite materials have been systematically investigated. It is found that the retained capacities of the anodes are more than 440 mAh/g after 400 cycles. These results indicate that organic solvent free process is a facile strategy for producing high performance silicon/graphite composite anodes.

UV grafting: surface modification of cellulose nanofibers without the use of organic solvents

2019 ◽  
Vol 21 (17) ◽  
pp. 4619-4624 ◽  
Author(s):  
Xianpeng Yang ◽  
Ting-Hsuan Ku ◽  
Subir K. Biswas ◽  
Hiroyuki Yano ◽  
Kentaro Abe
Keyword(s):  
Surface Modification ◽  
Organic Solvent ◽  
Organic Solvents ◽  
Uv Irradiation ◽  
Cellulose Nanofibers ◽  
Solvent Free ◽  
Free Process

Polymers were grafted from the surfaces of cellulose nanofibers by UV irradiation with an organic solvent-free process.

Preparation of waterborne polyurethanes based on the organic solvent-free process

2016 ◽  
Vol 18 (2) ◽  
pp. 412-416 ◽  
Author(s):  
Yao Xiao ◽  
Xiaowei Fu ◽  
Yanyan Zhang ◽  
Zhimeng Liu ◽  
Liang Jiang ◽  
...  
Keyword(s):  
Organic Solvent ◽  
Solvent Free ◽  
Waterborne Polyurethanes ◽  
Free Process

Green WPU was prepared based on the organic solvent-free process, where water was only used to dissolve the solid reactants and reduce the viscosity.

scholarly journals Encapsulation of Curcumin-Loaded Liposomes for Colonic Drug Delivery in a pH-Responsive Polymer Cluster Using a pH-Driven and Organic Solvent-Free Process

Molecules ◽  
2018 ◽  
Vol 23 (4) ◽  
pp. 739 ◽  
Author(s):  
Vincenzo De Leo ◽  
Francesco Milano ◽  
Erminia Mancini ◽  
Roberto Comparelli ◽  
Livia Giotta ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Organic Solvent ◽  
Solvent Free ◽  
Ph Responsive ◽  
Colonic Drug Delivery ◽  
Free Process ◽  
Responsive Polymer

Highly-efficient production of spherical co-agglomerates of drugs via an organic solvent-free process and a mechanism study

2021 ◽  
Author(s):  
Mengmeng Sun ◽  
Yanbo Liu ◽  
Hui Yan ◽  
Mingyang Chen ◽  
Junbo Gong
Keyword(s):  
Organic Solvent ◽  
Solvent Free ◽  
Efficient Technique ◽  
Efficient Production ◽  
Mechanism Study ◽  
Highly Efficient ◽  
Free Process

This work aims at developing a green and highly-efficient technique, which enables co-crystallization and co-agglomeration of drugs, or the crystallization of one drug and simultaneous agglomeration with another drug, in...

Dual crosslinked polyamidoxime/alginate sponge for robust and efficient uranium adsorption from aqueous solution

2020 ◽  
Vol 44 (45) ◽  
pp. 19445-19449
Author(s):  
Caina Han ◽  
Yaru Yue ◽  
Xin Xu ◽  
Dong Cai ◽  
Zhongjie Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Organic Solvent ◽  
Low Cost ◽  
Solvent Free ◽  
Water Soluble ◽  
Uranium Adsorption ◽  
Highly Efficient ◽  
Efficient Extraction ◽  
Uranium From Seawater

A facile, low-cost, organic solvent-free fabrication strategy is developed to prepare a seawater-stable sponge adsorbent from a water-soluble precursor for highly efficient extraction of uranium from seawater and uranium-containing wastewater.

An organic solvent free process for the demethylation of 4-(4-methoxyphenyl)butanoic acid

2006 ◽  
Vol 8 (2) ◽  
pp. 181-182 ◽  
Author(s):  
Laurent Delhaye ◽  
Khalid Diker ◽  
Thomas Donck ◽  
Alain Merschaert
Keyword(s):  
Organic Solvent ◽  
Solvent Free ◽  
Butanoic Acid ◽  
Free Process
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