Arabian Journal of Chemistry
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2024
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IF 5.3
Shaochen Li,Qingyong Zhao,Jianhua Xiong,Nahid Pervez,Lina Lin,Yingjie Cai,Vincenzo Naddeo
Liquid ammonia dyeing emerges as an environmentally benign and sustainable option for the textile industry, characterized by a minimal ecological impact. However, its adoption is hampered by certain limitations, such as suboptimal dye exhaustion and issues with color uniformity, which present significant hurdles to its widespread industrial application. Building on the premise that the addition of water to an ethanol solvent can enhance reactive dye exhaustion in cotton fiber dyeing, this study delves into the dyeing behavior of ramie fiber using a water-liquid ammonia mixture with Reactive Red 195. The incorporation of water into the liquid ammonia solution was observed to marginally decrease the color strength (K/S value) of the dyed ramie fiber, compared to the dyeing with anhydrous liquid ammonia. This reduction is likely due to the diminished expansion of the amorphous regions within the fiber. However, the color levelness of the dyed ramie fiber was enhanced by the addition of water to the liquid ammonia. To decipher the influences on the dyeing process, the Taguchi method, utilizing an orthogonal array (L16), was applied. The analysis revealed that the dye mass factor was the predominant influencer (79.08 %), followed by the liquor ratio factor (18.53 %), with both factors demonstrating statistically significant effects (p < 0.05). A multifaceted analysis of the samples was conducted using advanced techniques such as XRD (X-ray diffraction), FTIR (Fourier transform infrared), TGA (thermogravimetric analysis), and SEM (scanning electron microscopy). These analyses confirmed that the water-liquid ammonia treatment induced changes in the samples’ properties. The treated samples exhibited lower barium activity numbers and breaking force values, indicating structural alterations. Furthermore, the molecular structure of Reactive Red 195 remained intact throughout the dyeing process in the water-liquid ammonia mixture, thereby affirming its viability for practical applications in the textile industry.
研究领域:
纺织科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
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2025
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IF 3.5
Lei Li,Xinyu Ye,Huaixi Liu,Rongwen Lu,Bingtao Tang,Shufen Zhang
Integrating the diazotization and coupling reactions in solid–liquid heterogeneous systems to achieve large-scale, multistep continuous flow synthesis of water-soluble azo dyes remains a significant challenge. During the diazotization process of water-soluble azo dyes, considerable diazonium salt may precipitate, posing potential safety risks. In this study, we established a continuous dynamic tubular reaction system to achieve the multistep continuous heterogeneous synthesis of C.I. Reactive Red 195, a representative water-soluble azo dye. The optimal conditions for continuous diazotization and coupling reactions were determined, achieving a high throughput of 120 L/h and a yield of up to 736 kg/day. The purity of the synthesized dye increased by 20% compared to the commercial C.I. Reactive Red 195, with the K/S value rising from 19.07 to 22.16, indicating enhanced dyeing performance. Density functional theory (DFT) calculations and ab initio molecular dynamics (AIMD) simulations show that 2-naphthylamine-1,5-disulfonic acid diazonium salt (NADA-DS) spontaneously aggregates into stable clusters due to dispersion forces, which leads to precipitation. Furthermore, the thermal stability, impact sensitivity, explosive propagation, and decomposition activation energy of NADA-DS were investigated. The severity and possibility of thermal runaway during the continuous diazotization process are classified as level 1. The risk matrix indicates that the continuous diazotization process risk is acceptable, with the Stoessel criticality diagram categorizing the hazard level as grade 1, signifying a low level of risk. This study promotes safer, more efficient, and sustainable production of water-soluble azo dyes.
研究领域:
化学工程
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材料科学
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安全科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Tingfei Lou,Shizhu Song,Xiaohong Gao,Wenjing Qian,Xiaolei Chen,Qi Li
Herein, hollow carbon sphere (HCS)-supported titanium dioxide (TiO 2 ) nanoparticles (sub-20-nm; HCS@TiO 2 )-based composites are rationally designed and fabricated via a facile wet-chemistry strategy. The introduction of an HCS, which acts as a conductive substrate, improves the separation efficiency of photogenerated hole/electron pairs (h + /e − ) from TiO 2 because photogenerated electrons are transferred to conductive carbon skeleton. Due to the three-dimensional spherical structure and excellent hydrophilicity of the carbon skeletons, low-density HCS with outstanding conductivity not only accelerate the separation of photogenerated h + /e − pairs from TiO 2 but also improve the adsorption performance of the soluble reactive red 195 molecules (RR195) on the surface of TiO 2 nanoparticles. These properties of HCS@TiO 2 composites enable efficient photocatalytic degradation of RR195. The obtained results indicated that HCS@TiO 2 composites (80 wt% TiO 2 ) achieved the best photocatalytic degradation performance with higher photodegradation rate of 97% than pure TiO 2 nanoparticles (86%). This study offers a new pathway for the design and preparation of novel photocatalysts to achieve efficient degradation of degrading organic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
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IF 0
Deb Hridam,Hasan Md Khalid,Islam Md Zahidul,Yang Shujuan,Zhang Yong,Yao Juming
Graphene-based adsorbent was prepared by adopting a green synthetic route via the chemical exfoliation of graphite and low-temperature thermal activation. Prepared reactive graphene (RG) was characterized through various techniques, and its adsorption capabilities for textile dye removal were investigated for Acid Blue-93 (AB) and Reactive Red-195 (RR) under different operational conditions. The dye sorption equilibrium and mechanism were comprehensively studied using isotherm and kinetic models and compared statistically to explain the sorption behavior. Results show AB and RR adsorption by RG attains equilibrium in 60 min and 70 min, with a high sorption quantity of 397 mg g −1 and 262 mg g −1 (initial dye concentration of 100 mg L −1 ), respectively. The dye sorption anticipates that the high surface area (104.52 m 2 gm −1 ) and constructed meso-macroporous features of RG facilitated the interaction between the dye molecules and graphitic skeleton. The R-P isotherm fitted the best of equilibrium data, having the least variance in residuals for both dyes (AB = 0.00031 and RR = 0.00047). The pseudo-second order model best fitted the kinetics of sorption on RG, with chemisorption being the predominant process delimiting step. The overall results promise the dye removal capability of RG to be an efficient adsorbent for azo-based dyes from textile effluents.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
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