Efficient capture of phosphate from wastewater by a recyclable ionic liquid functionalized polyacrylonitrile fiber: A typical “Release and Catch” mechanism

2022 ◽  
Author(s):  
Wenjie Zheng ◽  
Qianwen Wu ◽  
Wusong Xu ◽  
Qizhong Xiong ◽  
Yusef Kianpoor Kalkhajeh ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Renewable Resource ◽  
Polyacrylonitrile Fiber ◽  
Phosphorus Containing ◽  
Catch Mechanism

The enrichment and separation of phosphorus-containing compounds from wastewater can prevent eutrophication and recycle non-renewable resource. Herein, we developed a recyclable functionalized polyacrylonitrile fiber (PANAF-Cl) capable of loading ionic liquid...

scholarly journals Mass transport and yield during spinning of lignin-cellulose carbon fiber precursors

Holzforschung ◽  
2019 ◽  
Vol 73 (5) ◽  
pp. 509-516 ◽  
Author(s):  
Jenny Bengtsson ◽  
Kerstin Jedvert ◽  
Artur Hedlund ◽  
Tobias Köhnke ◽  
Hans Theliander
Keyword(s):  
Ionic Liquid ◽  
Mass Transport ◽  
Total Concentration ◽  
Renewable Resource ◽  
Wet Spinning ◽  
Lignin Concentration ◽  
Liquid Solutions ◽  
Fundamental Understanding ◽  
Crucial Information ◽  
Soluble Lignin

Abstract Lignin, a substance considered as a residue in biomass and ethanol production, has been identified as a renewable resource suitable for making inexpensive carbon fibers (CFs), which would widen the range of possible applications for light-weight CFs reinforced composites. Wet spinning of lignin-cellulose ionic liquid solutions is a promising method for producing lignin-based CFs precursors. However, wet-spinning solutions containing lignin pose technical challenges that have to be solved to enable industrialization. One of these issues is that a part of the lignin leaches into the coagulation liquid, which reduces yield and might complicate solvent recovery. In this work, the mass transport during coagulation is studied in depth using a model system and trends are confirmed with spinning trials. It was discovered that during coagulation, efflux of ionic liquid is not hindered by lignin concentration in solution and the formed cellulose network will enclose soluble lignin. Consequently, a high total concentration of lignin and cellulose in solution is advantageous to maximize yield. This work provides a fundamental understanding on mass transport during coagulation of lignin-cellulose solutions, crucial information when designing new solution-based fiber forming processes.

Flame retardancy of phosphorus-containing ionic liquid based epoxy networks

2016 ◽  
Vol 134 ◽  
pp. 186-193 ◽  
Author(s):  
Rodolphe Sonnier ◽  
Loïc Dumazert ◽  
Sébastien Livi ◽  
Thi Khanh Ly Nguyen ◽  
Jannick Duchet-Rumeau ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Flame Retardancy ◽  
Epoxy Networks ◽  
Phosphorus Containing

Hydrolysis of Cellulose to Produce Glucose in Ionic Liquid-Water Mixtures

2013 ◽  
Vol 634-638 ◽  
pp. 873-876 ◽  
Author(s):  
Tian Jiao Xu ◽  
Jin Yang Chen ◽  
Yi Mei Ji
Keyword(s):  
Ionic Liquid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Liquid Water ◽  
Renewable Resource ◽  
Fuel Ethanol ◽  
Mass Ratio ◽  
Hydrolysis Of Cellulose ◽  
Benign Process ◽  
Hydrolysis Of

The lignocellulose is a widespread renewable resource. With the decrease of the petrochemical resources, lignocellulose is very important as an alternative resource to produce fuel ethanol. As for the conversion of cellulose into fuel ethanol, the saccharification of cellulose is a key process. The environment benign process using ionic liquid-water mixtures is studied to mild hydrolysis of cellulose to glucose without acid as catalyst. Ionic liquid of 1-allyl-3-methylimidazolium chloride ([Amim]Cl) is chosen to mix with water because it has great solubility of cellulose. The mass ratio of water with ionic liquid, reaction temperature and reaction time are studied and the optimal conditions of glucose yield are obtained as follows: the mass ratio of water 0.375, the reaction temperature 433 K and the reaction time 4h, and the yield of glucose is 77.08%.

Structure and Property Development of Polyacrylonitrile Fiber with Ionic Liquid as Solvent during Spinning Process

2014 ◽  
Vol 936 ◽  
pp. 997-1001 ◽  
Author(s):  
Hai Ming Cheng ◽  
En Jie Zhang ◽  
Xue Min Yin ◽  
Yu Mei Zhang ◽  
Hua Ping Wang
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquid ◽  
Dynamic Mechanical Properties ◽  
Polyacrylonitrile Fiber ◽  
Property Development ◽  
Elongation At Break ◽  
Structure And Property ◽  
Pan Fiber ◽  
Subsequent Decrease ◽  
Spinning Process

In order to study the structure and property development of polyacrylonitrile fiber during spinning process with ionic liquid as solvent, the 13 wt% PAN/[BMICl solution was prepared by dissolving polyacrylonitrile (PAN) in 1-butyl-3-methylimidazolium chloride ([BMICl). The dry-jet wet spinning of PAN/[BMIM]Cl was carried out to obtain the samples along spinning line. The mechanical properties, dynamic mechanical properties (DMA) and supramolecular structure of PAN fiber were analyzed. It is found that along spinning line tensile strength of PAN fiber increased significantly; initially, elongation at break increased followed by subsequent decrease. The fibers glass transition temperature (Tg) drops initially and later becomes constant; however, the fibers crystallinity and orientation increased.

scholarly journals Selective substitution of long-acyl groups into alcohols of kraft lignin over transesterification using ionic liquid

2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Shiori Suzuki ◽  
Tadahisa Iwata
Keyword(s):  
Ionic Liquid ◽  
Renewable Resource ◽  
Kraft Lignin ◽  
Kraft Pulping ◽  
Polymer Materials ◽  
Vinyl Esters ◽  
Oh Groups ◽  
Wide Range ◽  
Chain Acyl ◽  
Selective Substitution

AbstractKraft lignin is a valuable aromatic renewable resource that is discharged in large quantities during the kraft pulping process. In this study, kraft lignin derivatives with improved solubility and thermal properties were prepared by a facile chemical modification of the aliphatic hydroxy (R-OH) group in kraft lignin with various ester groups. Kraft lignin was subjected to homogeneous transesterification with vinyl esters as acyl donors using an ionic liquid as a green solvent and catalyst. The selective introduction of acyl groups into the R-OH group was confirmed by nuclear magnetic resonance (NMR) spectroscopy, and it was estimated that approximately 90% of the R-OH group was converted whereas more than 80% of the aromatic hydroxy (Ar-OH) group was retained. The R-OH-selective introduction of long-chain acyl groups of more than six carbons successfully provided superior solubility in common low-boiling solvents, such as chloroform and tetrahydrofuran, and sufficient heat-meltability to be molded into films by hot-pressing. All the kraft lignin derivatives showed high glass transition temperatures of over 100 °C, indicating their potential to be heat-resistant materials. The kraft lignin derivatives, in which only the R-OH group was acylated, retain their inherently rich Ar-OH groups and thus, can be applied as desirable precursors in a wide range of further chemical treatments for functional polymer materials.

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