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

(3 citation statements)

References 50 publications

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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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“…Reverse osmosis, membrane filtration, adsorption, activated alumina, activated carbon, and photocatalysis are some of these approaches (Tlili & Alkanhal 2019;Abdel-Fatah 2020). The photocatalytic degradation method is regarded as one of the most advantageous wastewater cleanup processes from a variety of sources (Loeb et al 2019;Nkwoada et al 2022a). As a result, a good photocatalyst with cost savings, material stability, enhanced band structure, and a greater photodegradation rate is necessary (Yang & Wang 2018;Wang et al 2020).…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

Development of PSA@PS-TiO2 nanocomposite photocatalyst: structure, mechanism, and application using response surface designs and molecular modeling

Nkwoada

Gerald

Oguzie

et al. 2023

Water Science &Amp; Technology

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Using periwinkle shell ash (PSA) and polystyrene (PS), a new-fangled PSA@PS-TiO2 photocatalyst was fabricated. The morphological images of all the samples studied using a high-resolution transmission electron microscope (HR-TEM) showed a size distribution of 50–200 nm for all samples. The SEM-EDX showed that the membrane substrate of PS was well dispersed, confirming the presence of anatase/rutile phases of TiO2, and Ti and O2 were the major composites. Given the very rough surface morphology (atomic force microscopy (AFM)) due to PSA, the main crystal phases (XRD) of TiO2 (rutile and anatase), low bandgap (UVDRS), and beneficial functional groups (FTIR-ATR), the 2.5 wt.% of PSA@PS-TiO2 exhibited better photocatalytic efficiency for methyl orange degradation. The photocatalyst, pH, and initial concentration were investigated and the PSA@PS-TiO2 was reused for five cycles with the same efficiency. Regression modeling predicted 98% efficiency and computational modeling showed a nucleophilic initial attack initiated by a nitro group. Therefore, PSA@PS-TiO2 nanocomposite is an industrially promising photocatalyst for treating azo dyes, particularly, methyl orange from an aqueous solution.

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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.…”

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

Cited by 4 publications

References 50 publications

Recent advances of silicate materials for wastewater treatment: a review

Recent advances of silicate materials for wastewater treatment: a review

Development of PSA@PS-TiO2 nanocomposite photocatalyst: structure, mechanism, and application using response surface designs and molecular modeling

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

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