scholarly journals Novel Mesoporous Lignin-Calcium for Efficiently Scavenging Cationic Dyes from Dyestuff Effluent

ACS Omega ◽  
2020 ◽  
Author(s):  
Kun Dai ◽  
Gulin Zhao ◽  
Zichen Wang ◽  
Xiaoqiang Peng ◽  
Jinglan Wu ◽  
...  
Keyword(s):  
Cationic Dyes

Removal of Toxic Dyestuffs from Aqueous Solution by Amphoteric Bioadsorbent

2020 ◽  
Vol 16 ◽  
Author(s):  
Reda M. El-Shishtawy ◽  
Abdullah M. Asiri ◽  
Nahed S. E. Ahmed
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Dye Removal ◽  
Exchange Process ◽  
Cationic Dyes ◽  
Carboxyl Groups ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Isotherm ◽  
Ion Exchange Process ◽  
Dyes And Pigments

Background: Color effluents generated from the production industry of dyes and pigments and their use in different applications such as textile, paper, leather tanning, and food industries, are high in color and contaminants that damage the aquatic life. It is estimated that about 105 of various commercial dyes and pigments amounted to 7×105 tons are produced annually worldwide. Ultimately, about 10–15% is wasted into the effluents of the textile industry. Chitin is abundant in nature, and it is a linear biopolymer containing acetamido and hydroxyl groups amenable to render it atmospheric by introducing amino and carboxyl groups, hence able to remove different classes of toxic organic dyes from colored effluents. Methods: Chitin was chemically modified to render it amphoteric via the introduction of carboxyl and amino groups. The amphoteric chitin has been fully characterized by FTIR, TGA-DTG, elemental analysis, SEM, and point of zero charge. Adsorption optimization for both anionic and cationic dyes was made by batch adsorption method, and the conditions obtained were used for studying the kinetics and thermodynamics of adsorption. Results: The results of dye removal proved that the adsorbent was proven effective in removing both anionic and cationic dyes (Acid Red 1 and methylene blue (MB)), at their respective optimum pHs (2 for acid and 8 for cationic dye). The equilibrium isotherm at room temperature fitted the Freundlich model for MB, and the maximum adsorption capacity was 98.2 mg/g using 50 mg/l of MB, whereas the equilibrium isotherm fitted the Freundlich and Langmuir model for AR1 and the maximum adsorption capacity was 128.2 mg/g. Kinetic results indicate that the adsorption is a two-step diffusion process for both dyes as indicated by the values of the initial adsorption factor (Ri) and follows the pseudo-second-order kinetics. Also, thermodynamic calculations suggest that the adsorption of AR1 on the amphoteric chitin is an endothermic process from 294 to 303 K. The result indicated that the mechanism of adsorption is chemisorption via an ion-exchange process. Also, recycling of the adsorbent was easy, and its reuse for dye removal was effective. Conclusion: New amphoteric chitin has been successfully synthesized and characterized. This resin material, which contains amino and carboxyl groups, is novel as such chemical modification of chitin hasn’t been reported. The amphoteric chitin has proven effective in decolorizing aqueous solution from anionic and cationic dyes. The adsorption behavior of amphoteric chitin is believed to follow chemical adsorption with an ion-exchange process. The recycling process for few cycles indicated that the loaded adsorbent could be regenerated by simple treatment and retested for removing anionic and cationic dyes without any loss in the adsorbability. Therefore, the study introduces a new and easy approach for the development of amphoteric adsorbent for application in the removal of different dyes from aqueous solutions.

Synergistic effect of NS co-doped TiO2 adsorbent for removal of cationic dyes

2021 ◽  
pp. 105480
Author(s):  
Ruhma Rashid ◽  
Iqrash Shafiq ◽  
Muhammad Javid Iqbal ◽  
Maira Shabir ◽  
Parveen Akhter ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Cationic Dyes ◽  
Doped Tio2 ◽  
Co Doped

scholarly journals Novel synthesis of bimetallic Ag-Cu nanocatalysts for rapid oxidative and reductive degradation of anionic and cationic dyes

2021 ◽  
Vol 3 ◽  
pp. 100056
Author(s):  
Hesham R. Tantawy ◽  
Amr A. Nada ◽  
Ahmad Baraka ◽  
Mohamed A. Elsayed
Keyword(s):  
Cationic Dyes ◽  
Novel Synthesis ◽  
Reductive Degradation

Multifunctional amphoteric resin to remove both anionic and cationic dyes from aqueous solution

2021 ◽  
pp. 51283
Author(s):  
Ramazan Coşkun ◽  
Kadriye Öncel ◽  
Yasin Akköz
Keyword(s):  
Aqueous Solution ◽  
Cationic Dyes

Evaluation of the adsorptive removal of cationic dyes by greening biochar derived from agricultural bio-waste of rice husk

2021 ◽  
Author(s):  
Praveen Saravanan ◽  
Jegan Josephraj ◽  
Bhagavathi Pushpa Thillainayagam ◽  
Gokulan Ravindiran
Keyword(s):  
Rice Husk ◽  
Cationic Dyes ◽  
Adsorptive Removal

Adsorptive removal and photocatalytic decomposition of cationic dyes on niobium oxide with deformed orthorhombic structure

2021 ◽  
pp. 125635
Author(s):  
Tarmizi Taher ◽  
Akihiro Yoshida ◽  
Aldes Lesbani ◽  
Irwan Kurnia ◽  
Guoqing Guan ◽  
...  
Keyword(s):  
Niobium Oxide ◽  
Cationic Dyes ◽  
Photocatalytic Decomposition ◽  
Orthorhombic Structure ◽  
Adsorptive Removal

scholarly journals Color-Variable Photodynamic Antimicrobial Wool/Acrylic Blended Fabrics

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4141
Author(s):  
Tingting Wang ◽  
Wangbingfei Chen ◽  
Tingting Dong ◽  
Zihao Lv ◽  
Siming Zheng ◽  
...  
Keyword(s):  
Low Cost ◽  
Pathogen Transmission ◽  
Cationic Dyes ◽  
Light Illumination ◽  
Antibacterial Studies ◽  
Wool Fibers ◽  
Visible Light Illumination ◽  
Potential Applications ◽  
Dyed Fabrics ◽  
Acrylic Fibers

Towards the goal of developing scalable, economical and effective antimicrobial textiles to reduce infection transmission, here we prepared color-variable photodynamic materials comprised of photosensitizer (PS)-loaded wool/acrylic (W/A) blends. Wool fibers in the W/A blended fabrics were loaded with the photosensitizer rose bengal (RB), and the acrylic fibers were dyed with a variety of traditional cationic dyes (cationic yellow, cationic blue and cationic red) to broaden their color range. Investigations on the colorimetric and photodynamic properties of a series of these materials were implemented through CIELab evaluation, as well as photooxidation and antibacterial studies. Generally, the photodynamic efficacy of these dual-dyed fabrics was impacted by both the choice, and how much of the traditional cationic dye was employed in the dyeing of the W/A fabrics. When compared with the PS-only singly-dyed material, RB-W/A, that showed a 99.97% (3.5 log units; p = 0.02) reduction of Staphylococcus aureus under visible light illumination (λ ≥ 420 nm, 60 min), the addition of cationic dyes led to a slight decrease in the photoinactivation ability of the dual-dyed fabrics, but was still able to achieve a 99.3% inactivation of S. aureus. Overall, our findings demonstrate the feasibility and potential applications of low cost and color variable RB-loaded W/A blended fabrics as effective self-disinfecting textiles against pathogen transmission.

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