RSC Advances
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2022
·Vol. 12
·期 17
·10386-10394
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IF 4.036
Hongzhi Zhao,Kun Zhang,Kuanjun Fang,Furui Shi,Ying Pan,Fuyun Sun,Dezhen Wang,Ruyi Xie,Weichao Chen
Mercerization can improve the utilization rate of dyes in the dyeing process, and reduce the discharge of washing wastewater. However, the effect and mechanism of mercerization is not clear on digital inkjet printing of cotton fabric. In this work, two kinds of cotton fabrics (original and mercerized) were used for reactive dye digital inkjet printing, and the color improvement mechanism of caustic soda mercerization was investigated. It was found that the crystallinity of cotton fibre was adjusted from 73.9% to 58.5% by caustic mercerization, and the breaking strength did not decrease compared with original cotton fibre. Thus, the accessible reactive hydroxyl groups and the wettability were enhanced for treated cotton fibres, which promoted the inks' wick into the fibres. Interestingly, the penetration of ink droplets between the yarns and fibres after caustic mercerization was decreased, thus the dyes mainly gathered on the surface of cotton fabric. The cotton fibres' cross section structure changed from flat oval to round, which increased the contact area between reactive dyes and fibres. At a certain amount of ink, the optimal K/S value of 23.47 was achieved for treated cotton fabrics, which was higher than that of untreated cotton fabrics (17.15). Meanwhile, the printed fabrics displayed good washing fastness, rubbing fastness and glossiness. This work has important theoretical guiding significance for producing high quality mercerized cotton fabric digital printing products and reducing printing wastewater discharge.
研究领域:
纺织科学
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染整工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Liu Yucheng,Zhu Mengke,Ji Xinghu,Tan Zhiyou,He Zhike
The reverse osmosis (RO) technique has been extensively employed in the advanced treatment of industrial water and wastewater. However, this process results in the production of a significant quantity of reverse osmosis concentrate (ROC), which contains high levels of salinity and organic contaminants, thereby posing serious environmental problems. This study reported a two-stage precipitation process utilizing quicklime (CaO) and caustic soda (NaOH) in conjunction with air blowing (carbonation) for the removal of Ca 2+ and Mg 2+ from real brackish water ROC of factory. In stage I, the CaO precipitation-carbonation process was employed to eliminate the majority of Ca 2+ from the ROC, while leaving Mg 2+ virtually unaffected, yielding high-purity CaCO 3 precipitates. In stage II, the NaOH precipitation method was utilized to eliminate the remaining Ca 2+ and Mg 2+ from the ROC. It was demonstrated that under optimal conditions, the removal rates of Ca 2+ and Mg 2+ exceeded 97%. Finally, the characterization of precipitates demonstrated the generation of high-purity CaCO 3 precipitates in stage I, as well as the formation of CaCO 3 and Mg(OH) 2 precipitates in stage II. The results confirmed the feasibility of employing the two-stage precipitation with carbonation process to economically treat ROC and enable its reuse, offering valuable insights for the treatment of industrial wastewater.
研究领域:
环境工程
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水处理
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废水管理
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DOI
PubMed
Greenhouse Gases-Science and Technology
·
2023
·Vol. 13
·期 6
·814-828
·
IF 2.2
Yuhang Yang,Wenxiu Li,Zhiwei Xun,Zhenwei Yi,Tao Wang,Zitao Yu,Yan Huang,Yongzheng Gu
In light of the current situation where the utilization of calcium carbide slag yields low profits but holds significant potential for reducing carbon emissions, ammonium acetate was employed to leach calcium carbide slag. It also played a crucial role in regulating the products of indirect carbon dioxide carbonation when mixed with glycine and lye. Ammonium acetate's significance underscores its dual role in both the leaching and carbonation processes. This process yielded calcium carbonate with particle sizes smaller than 100 nm, with a purity of 98% and a single vaterite phase. The calcium carbide residue demonstrated an impressive CO 2 uptake rate of 23.5%. Ammonium acetate exhibited an efficiency of 79.2% as a leaching agent. The ammonium acetate method demonstrated enhanced environmental friendliness and facilitated a more efficient carbon uptake rate of 23.5% compared to conventional indirect methods. Furthermore, the addition of lye, glycine, and ammonium acetate effectively extended the nucleation time of the calcium carbonate crystals and induced the formation of more vaterite intermediates with smaller particle sizes. The influence mechanism of compound additives on the carbonation reaction was revealed through kinetic analysis and molecular dynamics. This innovative approach offers a promising avenue for simultaneously treating solid waste and reducing CO 2 emission. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
高影响因子
Communications Chemistry
·
2025
·Vol. 8
·期 1
·1-11
·
IF 6.2
Wang Min,Luo Xiongfei,Wang Qunying,Strehmel Veronika,Chen Zhijun,Li Shujun,Strehmel Bernd
Valorization of waste for chemical processes addresses a challenging task for the society. Soda lignin ( AL ) available in the pulp industry operated in a photocatalytic cycle CuX 2 / L (X: Br, Cl; L : Me 6 TREN: Tris[2-(dimethylamino)ethyl]amine) and to initiate radical photopolymerization of methyl methacrylate (MMA) with α-bromophenylacetate (EBPA) by exposure at 420 nm. This resulted in poly(methyl methacrylate) (PMMA ) exhibiting a dispersity <1.3 with CuX 2 /L loading of ≲ 52 ppm. Deactivator reduction increased dispersity. MMA, styrene, and benzyl methacrylate successfully served as monomers for chain extension and block copolymerization experiments. This worked with CuX 2 /L ≥ 6.5 ppm, although conventional radical polymerization additionally competed. Adding of sodium pyruvate enabled radical photopolymerization under air. Modification of lignin with an aryl sulfonate group resulted in a one-component photoinitiator. It successfully initiated radical photopolymerization of a monomer mixture of (hydroxyethyl)methacrylate (HEMA) and urethane dimethacrylate (UDMA). Scale-up experiments approved practicability of photo-ATRP.
研究领域:
高分子化学
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绿色化学
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光催化
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材料科学
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可持续化学
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工业化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）