Synthesis of Lignin Amine Asphalt Emulsifier and its Investigation by Online FTIR Spectrophotometry

Xiang, Tao; Shi, Lai; Sun, Mengjia; Li, Na

doi:10.4028/www.scientific.net/amr.909.72

Cited by 14 publications

(8 citation statements)

References 4 publications

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“…One of the bases of lignin amination is the Mannich reaction that refers to the reaction between the lignin and amine in the presence of formaldehyde. The obtained aminated lignin has properties that make it ideal for use in several applications, including surfactants, dispersants, heavy metal adsorbents, and asphalt emulsifiers. , Because of its aromatic/phenolic nature and cationic side chain, the aminated lignin could have great potential as a low-cost bioadsorbent for the removal of organic dyes especially azo dyes that are typically anionic in charge in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution

et al. 2020

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How to effectively remove toxic dyes from the industrial wastewater using a green low-cost lignocellulose-based adsorbent, such as lignin, has become a topic of great interest but remains quite challenging. In this study, cosolvent-enhanced lignocellulosic fractionation (CELF) pretreatment and Mannich reaction were combined to generate an aminated CELF lignin which is subsequently applied for removal of methylene blue and direct blue (DB) 1 dye from aqueous solution. 31 P NMR was used to track the degree of amination, and an orthogonal design was applied to determine the relationship between the extent of amination and reaction parameters. The physicochemical, morphological, and thermal properties of the aminated CELF lignin were characterized to confirm the successful grafting of diethylenetriamine onto the lignin. The aminated CELF lignin proved to be an effective azo dye-adsorbent, demonstrating considerably enhanced dye decolorization, especially toward DB 1 dye (>90%). It had a maximum adsorption capacity of DB 1 dye of 502.7 mg/g, and the kinetic study suggested the adsorption process conformed to a pseudo-second-order kinetic model. The isotherm results also showed that the modified lignin-based adsorbent exhibited monolayer adsorption. The adsorbent properties were mainly attributed to the incorporated amine functionalities as well as the increased specific surface area of the aminated CELF lignin.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution

et al. 2020

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“…The emulsifying ability of emulsifier is usually characterized by the emulsified asphalt mass per 1 g emulsifier. Through the emulsifying ability test, we found that 1 g MCTS can emulsify 40 g asphalt, which is higher than that of the other macromolecular emulsifier . Figure (b) and 5(c) present a possible schematic representation of an asphalt emulsion droplet and the structure of asphaltene.…”

Section: Resultsmentioning

confidence: 99%

Modified Chitosan as a “Multi‐subtype” Macromolecular Emulsifier for Preparing Asphalt Emulsion

et al. 2019

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The “Multi‐subtype” macromolecular cationic asphalt emulsifier was synthesized based on chitosan (abbreviated as MCTS) via the ring‐opening reaction and quaternization. Then the structure of the emulsifier was characterized by FTIR and 1H‐NMR spectra. Moreover, the surface tension and critical micelle concentration (CMC) of the MCTS were determined from 298 to 313 K. The CMC and γcmc were 0.064 g L−1 and 38.85 mN m−1 at 298 K, respectively, and the lowest surface tension of the solution reached to 26.09 mN m−1 at 313 K. The tested Hydrophile‐Lipophile Balance (HLB) value of MCTS was 10, which can meet the requirement of asphalt emulsifier. Through emulsification experiments, the emulsifying ability of the MCTS was measured, and the results indicated that the emulsifier exhibited excellent application for asphalt. It may be caused by that the MCTS containing polar bundle groups could enhance the interaction between polar asphaltene and the emulsifier solution. Moreover, the prepared asphalt emulsion was more stable compared to the emulsion prepared by Gemini emulsifier. The demulsification experiments were also correspondingly done for emulsified asphalt. All the results showed that the MCTS has potential applications in the preparation of asphalt emulsion.

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“…Lignin amine, which was synthesized via the Mannich reaction, was used as the cationic emulsifier to produce emulsified asphalt [33]. It was an effective approach to recycle the biopolymer and reduce pollution of black liquor [34]. WCO was use as the light component supplemental resource for rejuvenators in this study, and Table 2 presents its properties.…”

Section: Raw Materialsmentioning

confidence: 99%

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

et al. 2019

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Using rejuvenator to improve the asphalt pavement service state has become an increasing concern in recent years. This study mainly focuses on the diffusion analysis between rejuvenator and aged asphalt, and further rheological influences by addition of rejuvenators. First, two rejuvenators, oil rejuvenator (OR) and penetrative rejuvenator (PR), were prepared in the laboratory. Afterward, the diffused performance of rejuvenators was investigated by viscosity, contact angle, and three self-designed feasible test indexes, which were sinking time test, softening rate test, and gravitational collapsing test. Beside the comparison in physical properties tests of aged and rejuvenated asphalt, their rheological performances were also evaluated by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) respectively. The results indicated that three proposed indexes can comparatively analyze the diffusion rate of different rejuvenators on aged asphalt effectively. Furthermore, all adopted test indexes signaled that PR has a faster diffusion rate and better penetrative efficiency. Comparatively, exceeding rejuvenator dosage would increase the rutting possibility. Nevertheless, 2.5 wt% addition dosage for both OR and PR into aged asphalt can promote appropriate improvement in physical properties and crack resistance. The study would supply a significant reference for penetrative rejuvenator preparation and its diffusing evaluation.

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Synthesis of Lignin Amine Asphalt Emulsifier and its Investigation by Online FTIR Spectrophotometry

Cited by 14 publications

References 4 publications

Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution

Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution

Modified Chitosan as a “Multi‐subtype” Macromolecular Emulsifier for Preparing Asphalt Emulsion

Diffusion Mechanism of Rejuvenator and Its Effects on the Physical and Rheological Performance of Aged Asphalt Binder

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