Removal of direct dyes by coagulation: Adaptability and mechanism related to the molecular structure

Wei, Qunshan; Zhang, Yanxia; Zhang, Kai; Mwasiagi, Josphat Igadwa; Zhao, Xiaoxiang; Chow, Christopher W.K.; Tang, Rui

doi:10.1007/s11814-021-1056-1

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…In addition, emitters containing sulfonate can act as direct dyes for the formation of hydrogen bonds with the hydroxyl groups in cloth. [51,52] As expected, excellent RTP performance was achieved on pure cotton cloth (Figures S22 and S23, Supporting Information), which further validates the universality of this system and expands its application scope. Finally, BP-2Br did not show significant RTP emission on the weighing paper, likely because it is not prone to hydrogen bonding, emphasizing the significance of hydrogen bonds between the substrates and ionic emitters for RTP (Figure S24, Supporting Information).…”

Section: Resultssupporting

confidence: 76%

The Simpler, the Better: Organic Materials with Adsorption‐Induced Room‐Temperature Phosphorescence for Anti‐Counterfeiting and Dyeing Applications

Liu

Tong

et al. 2023

Advanced Optical Materials

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In recent years, organic room‐temperature phosphorescence (RTP) has been widely investigated owing to its fascinating afterglow characteristics. Consequently, it has been applied in anti‐counterfeiting and information security. However, these applications are limited by cost, substrates, and technological processes. Hence, a simple and environmentally friendly adsorption‐induced RTP system containing sulfonic acid groups is designed for convenient and efficient application. A pure organic compound of (1,1″‐biphenyl)‐4,4″‐disulfonic acid can be easily ionized and dispersed in water. When it is adsorbed on different types of paper and cloth substrates rich in hydroxyl groups, bright RTP emissions with maximum lifetimes of ≈1.1 s are achieved after drying the substrates. The destructive effect of H2O on the intermolecular hydrogen bonds between the phosphor and substrates makes the RTP emissions responsive to the stimuli of water and heat. Furthermore, a white afterglow is realized after doping with Rhodamine B for energy transfer. On the account of the adsorption‐induced RTP effect, four economical applications are demonstrated, wherein one dollar's worth of the phosphor can be used for anti‐counterfeiting 7692 banknotes, printing and dyeing 1538 graphs on cloth, making 196 Chinese knots, and producing 385 writes of encryption information, promoting the further development and commercialization of RTP materials.

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Section: Resultssupporting

confidence: 76%

The Simpler, the Better: Organic Materials with Adsorption‐Induced Room‐Temperature Phosphorescence for Anti‐Counterfeiting and Dyeing Applications

Liu

Tong

et al. 2023

Advanced Optical Materials

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“…The difference in dye removal results could occur because the number of coagulant doses (40 mg/L) used was higher than in this study (28 mg/L). Another study also found Direct yellow 11 removal of 87.4% at 24.4 mg/L FeCl 3 which was lower due to the use of less coagulant [23].…”

Section: Methodsmentioning

confidence: 92%

Coupling of Coagulation and Fenton-Like Oxidation for Decolorization of Congo Red Dye in Water

Parningotan,

Adityosulindro

2023

BIO Web Conf.

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Azo dyes are widely utilized in a variety of industries, including food, cosmetics, and textiles. Removal of azo dyes from wastewater by the conventional biological process is challenging due to its toxicity. Alternative treatment technology is needed to remove the dye effectively and in a relatively short duration. The processing technology is expected to be able to reduce pollutant materials before they enter water bodies which are a source of agricultural irrigation. In this work, dye removal was studied in some physical and chemical processes, including coagulation (Coag.), Fenton-like oxidation (FLO), and its combination. Synthetic Congo Red (CR) solution was used as a contaminant model of dye wastewater. The assays were performed in a laboratory Jar-Test apparatus with varying FeCl3 coagulant doses (20-30 mg/L), H2O2 doses (42-1,680 mg/L), and coupling mode (Coag.-FLO; FLO-Coag.; FLO/Coag.). The congo red decolorization up to 87% was observed in the coupling of Coag.-FLO process at 24 mg/L FeCl3, 280 mg/L H2O2, pH 8 (Coag.) and pH 3 (FLO). Compared to the removal efficiency of the Coag. (color removal 45%) and FLO (color removal 62%) under selected circumstances. In addition to the higher CR removal, the coupling Coag.-FLO process showed potential cost saving due to less H2O2 dose and partially shift to coagulant.

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“…The dye removal behaviour is expected to depend on molecular weight, structure of dye, solubility, and the nature of dyes. It is also a well-recognized fact that dyes having longer molecular chains or larger molecular weights are more favorable for removal by coagulation 26,27 . Many dyes with low molecular weight and cationic dyes may not get effectively removed using coagulation 26 .…”

Section: Effect Of Nature Of Dyementioning

confidence: 99%

Conceptualizing Cavigulation Methodology by Integrating Cavitation and Coagulation and Application to Dye Wastewater Treatment

Sharma¹,

Chethana²,

Bhandari³

et al. 2023

J. ISAS

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The present work provides a proof of concept for a new hybrid process, cavigulation, by combining cavitation and coagulation and its application to dye wastewater treatment. Both acoustic and hydrodynamic cavitations were evaluated. Removal of a commonly used dyes such as Congo red was investigated by cavigulation in the concentration range of 50 to 500 ppm. A broad spectrum of coagulants including two inorganic coagulants; poly aluminium chloride, iron (III) chloride, and natural biocoagulants derived from Moringa oleifera, Cicer arietinum and Acanthocereus tetragonus were employed to substantiate the concept of cavigulation. A vortex diode device employing vortex flow for cavitation, was used for the hydrodynamic cavitation (HC) -based cavigulation. Cavigulation in the form of acoustic cavitation + coagulation, showed significant improvement over individual processes; acoustic cavitation alone was largely ineffective for dye removal. Increase over conventional coagulation to the extent of 24% and 48% was observed for the two inorganic coagulantsIron (III) chloride and PAC SAB 18, while for Moringa oleifera, Acanthocereus tetragonus, and Cicer arietinum the increase was 27%, 33%, and 29% respectively. The pH has a large impact on the cavigulation process, similar to coagulation and the coagulant dose could be reduced by more than half by adjusting pH to 3. Auramine O dye removal was effective using hydrodynamic cavitation compared to coagulation. The developed cavigulation process, especially using biocoagulants, could be an effective alternative to the conventional chemical coagulation in the form of a green process in dye wastewater treatment

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Removal of direct dyes by coagulation: Adaptability and mechanism related to the molecular structure

Cited by 18 publications

References 35 publications

The Simpler, the Better: Organic Materials with Adsorption‐Induced Room‐Temperature Phosphorescence for Anti‐Counterfeiting and Dyeing Applications

The Simpler, the Better: Organic Materials with Adsorption‐Induced Room‐Temperature Phosphorescence for Anti‐Counterfeiting and Dyeing Applications

Coupling of Coagulation and Fenton-Like Oxidation for Decolorization of Congo Red Dye in Water

Conceptualizing Cavigulation Methodology by Integrating Cavitation and Coagulation and Application to Dye Wastewater Treatment

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