Thermodynamics, Kinetics, and Reaction Mechanism of Kaolin Adsorption/Photocatalysis of Hazardous Cationic and Anionic Dyes

Nkwoada, Amarachi; Gerald, Onyedika; Oguzie, Emeka E.; Ogwuegbu, M. O. C.

doi:10.1007/s42250-022-00426-0

Cited by 4 publications

(2 citation statements)

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“…Within the crystal structure, the Si-O tetrahedron exhibit a higher negative charge, whereas the Al-O or Mg-O octahedra exhibit a higher positive charge, resulting in an internal charge imbalance within the crystal structure [72]. The kaolinite group, a typical representative of type 1:1 silicates [73,74], is distinguished by its large specific surface area, chemical and mechanical stability, and abundant surface hydroxyl radicals. This type of silicates are commonly employed as a carrier for loading other photocatalysts through chemical bonds.…”

Section: Type 1:1 Silicatesmentioning

confidence: 99%

Recent advances of silicate materials for wastewater treatment: a review

Xu,

Wang,

2024

Mater. Res. Express

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Heavy metal ions and organic pollutants cause irreversible damage to water environment, thereby posing significant threats to the well-being of organisms. The techniques of adsorption and photocatalytic degradation offer versatile solutions for addressing water pollution challenges, attributed to their inherent sustainability and adaptability. Silicates exhibit exceptional practicality in the realm of environmental protection owing to their structural integrity and robust chemical/thermal stability during hybridization and application process. Furthermore, the abundance of silicate reserves, coupled with their proven effectiveness, has garnered significant attention in recent years. This detailed review compiles and analyzes the extensive body of literature spanning the past six years (2018-2023), emphasizing the pivotal discoveries associated with employing silicates as water purification materials. This review article provides a comprehensive overview of the structure, classification, and chemical composition of diverse silicates and offers a thorough descriptive analysis of their performance in eliminating pollutants. Additionally, the utilization of diatomite as either precursors or substrates for silicates, along with the exploration of their corresponding purification mechanisms is discussed. The review unequivocally verifies the efficiency of silicates and their composites in the effective elimination of various toxic pollutants. However, the development of novel silicates capable of adapting to diverse environmental conditions to enhance pollution control, remains an urgent necessity.

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Section: Type 1:1 Silicatesmentioning

confidence: 99%

Recent advances of silicate materials for wastewater treatment: a review

Xu,

Wang,

2024

Mater. Res. Express

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“…Comparison of the maximum adsorption capacities (q m , mg/g) toward MB and EBT between the adsorbent reported in literature and the composite PAN/GO/PDA nanofiber membrane in this work. The maximum adsorption capacities were calculated through the Langmiur adsorption model [ 39 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 ], Table S6. Comparison of the adsorption capacities toward Cu 2+ between the adsorbent reported in literature and the composite 2.0 PAN/GO/PDA nanofiber membrane in this work [ 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 ], Figure S6.…”

mentioning

confidence: 99%

Recyclable Composite Membrane of Polydopamine and Graphene Oxide-Modified Polyacrylonitrile for Organic Dye Molecule and Heavy Metal Ion Removal

et al. 2022

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Developing efficient and recyclable membranes for water contaminant removal still remains a challenge in terms of practical applications. Herein, a recyclable membrane constituted of polyacrylonitrile-graphene and oxide-polydopamine was fabricated and demonstrated efficient adsorption capacities with respect to heavy metal ions (62.9 mg g−1 of Cu2+ ion, CuSO4 50 mg L−1) and organic dye molecules (306.7 mg g−1 of methylene blue and 339.6 mg g−1 of eriochrome black T, MB/EBT 50 mg L−1). The polyacrylonitrile fibers provide the skeleton of the membrane, while the graphene oxide and polydopamine endow the membrane with hydrophilicity, which is favorable for the adsorption of pollutants in water. Benefitting from the protonation and deprotonation effects of graphene oxide and polydopamine, the obtained membrane demonstrated promotion of the selective adsorption or desorption of pollutant molecules. This guarantees that the adsorbed pollutant molecules can be desorbed promptly from the membrane through simple pH adjustment, ensuring the reusability of the membrane. After ten adsorption–desorption cycles, the membrane could still maintain a desirable adsorption capacity. In addition, compared with other, similar membranes reported, this composite membrane displays the highest mechanical stability. This work puts forward an alternative strategy for recyclable membrane design and expects to promote the utilization of membrane techniques in practical wastewater treatment.

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