Review on nickel-based adsorption materials for Congo red

• Published in: Journal of hazardous materials 2021-02, Vol.403, p.123559, Article 123559
• Main Authors: Zheng, Yingqiu, Cheng, Bei, Fan, Jiajie, Yu, Jiaguo, Ho, Wingkei
• Format: Article
• Language: English
• Subjects: Adsorption; Congo red; Mechanism; Nickel-based adsorbents
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2020.123559

[Display omitted] •Nickel-based adsorbents show remarkable potential in CR adsorption.•Recent studies on CR adsorption by using nickel-based adsorbents are introduced.•The mechanisms of CR adsorption onto nickel-based adsorbents are summarized.•The effective regeneration of nickel-based adsorbents requires further exploration.•The CR adsorption ability depends on several factors related to the properties and structure. Excessive synthetic dyestuffs in the aquatic environment pose various ecological and health issues that are detrimental to sustainable development. Adsorption is considered a feasible technique of eliminating dye pollutants from the water environment because of its advantages of high efficiency, low cost, easy operation, and absence of secondary pollution. Among the many dyes, Congo red (CR) is a widely used azo dye. Nickel-based materials, including nickel hydroxide, nickel oxide, nickel-containing layered double hydroxides, nickel-based spinel and metal–organic frameworks, metallic nickel, nickel-based sulfide, and nickel composites, have been extensively studied for CR adsorption due to their morphological diversity, large specific surface area, and strong affinity toward CR. However, fabricating nickel-based adsorbents with high efficiency and stability and excellent recyclability for practical application remains a challenge. This review outlines the research progress of nickel-based materials in CR adsorption. The interaction between CR molecules and nickel-based adsorbents is systematically presented, and the possible adsorption mechanisms are summarized. Finally, the challenges and future development directions of the practical application of nickel-based adsorbent materials are proposed.