Application of Zn/Al layered double hydroxides for the removal of nano-scale plastic debris from aqueous systems

Tiwari, Ekta; Singh, Nisha; Monikh, Fazel Abdolahpur; Darbha, Gopala Krishna

doi:10.1016/j.jhazmat.2020.122769

Cited by 107 publications

(24 citation statements)

References 57 publications

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“…This stage can be attributed to the homogenized heat transfer process of the zinc-containing residues that absorbs microwaves and converts microwaves into heat energy. (2) The second stage at 300-500 • C, there is also a tendency to increase first and then decrease. This change indicated the phase structure may change during the microwave heating process.…”

Section: Influence Of Cao Addition On the Dielectric Properties Of Residuesmentioning

confidence: 99%

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Investigations on the Thermodynamics Characteristics, Thermal and Dielectric Properties of Calcium-Activated Zinc-Containing Metallurgical Residues

Zheng

Gao

et al. 2022

Materials

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An activate pretreatment of zinc-containing metallurgical residues were proposed by adding CaO and introducing microwave heating approach into the CaO activation pretreatment process to realize the conversion of refractory ore phases into pre-treated ore phase. Thermodynamic characteristics analysis indicated that adding CaO can realize the conversion of refractory ore phases, with the same effect as the carbon additives. Thermal conductivity properties analysis denoted that the thermal conductivity properties of ZnS and ZnFe2O4 were relatively poor. Meanwhile, the thermal conductivity properties of the residues sample added with 25% CaO were significantly superior to the residues added with other CaO contents, with the maximum specific heat value of 1.348 J/g·K at 350 °C. Dielectric properties analysis highlighted that adding CaO with the dielectric constant properties significantly higher than that of other substances can enhance the microwave absorption capacity of zinc-containing residues. The decrease in dielectric loss and loss tangent value with the increase of temperature and the residues having large microwave penetration depth guaranteed to obtain better uniformity of microwave heating. Furthermore, adding 25% CaO promoted the microwave penetration depth of the residues sample increased in the range of 300–500 °C. This work can lay a theoretical research foundation for solving the key difficulty for efficient Zn recovery from complex zinc-containing metallurgical residues.

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Section: Influence Of Cao Addition On the Dielectric Properties Of Residuesmentioning

confidence: 99%

“…Zinc (Zn) endows superior calenderability, corrosion resistance, and wear resistance; thereby it is widely applied in the fields like non-ferrous metallurgy, batteries, automobiles, and building materials [1][2][3]. Sphalerite (ZnS) is the main mineral used in industrial preparation of zinc, via an oxidization roasting approach.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Thermodynamics Characteristics, Thermal and Dielectric Properties of Calcium-Activated Zinc-Containing Metallurgical Residues

Zheng

Gao

et al. 2022

Materials

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Section: Membrane-based Filtrationmentioning

confidence: 99%

“…To enhance the adsorbing efficiency of NPs, Darbha et al designed a type of double-layered Zn-Al hydroxide (Zn-Al LDH) to adsorb PS particles with diameters smaller than 1 μm from aqueous solution. [91] The surface properties of MPs existing in the natural environment are dramatically altered to be more negatively charged due to oxidation. Thus to mimic this effect, PS NPs were pretreated by coating with anionic surfactant.…”

Section: Adsorptionmentioning

confidence: 99%

How to Build a Microplastics‐Free Environment: Strategies for Microplastics Degradation and Plastics Recycling

et al. 2022

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Microplastics are an emergent yet critical issue for the environment because of high degradation resistance and bioaccumulation. Unfortunately, the current technologies to remove, recycle, or degrade microplastics are insufficient for complete elimination. In addition, the fragmentation and degradation of mismanaged plastic wastes in environment have recently been identified as a significant source of microplastics. Thus, the developments of effective microplastics removal methods, as well as, plastics recycling strategies are crucial to build a microplastics‐free environment. Herein, this review comprehensively summarizes the current technologies for eliminating microplastics from the environment and highlights two key aspects to achieve this goal: 1) Catalytic degradation of microplastics into environmentally friendly organics (carbon dioxide and water); 2) catalytic recycling and upcycling plastic wastes into monomers, fuels, and valorized chemicals. The mechanisms, catalysts, feasibility, and challenges of these methods are also discussed. Novel catalytic methods such as, photocatalysis, advanced oxidation process, and biotechnology are promising and eco‐friendly candidates to transform microplastics and plastic wastes into environmentally benign and valuable products. In the future, more effort is encouraged to develop eco‐friendly methods for the catalytic conversion of plastics into valuable products with high efficiency, high product selectivity, and low cost under mild conditions.

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“…Adsorbents derived from hydrotalcites can be used for the removal of acute toxic drug diclofenac in wastewater [60], while the usual treatment processes are not able to totally eliminate this compound. Moreover, Zn/Al layered double hydroxides can be used for the removal of nanoscale plastic debris from aqueous systems [61].…”

Section: General Application Of the Hydrotalcitesmentioning

confidence: 99%

Hydrotalcites in Construction Materials

et al. 2020

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Hydrotalcites are layered double hydroxides displaying a variety of stoichiometry caused by the different arrangement of the stacking of the layers, ordering of the metal cations, as well as the arrangement of anions and water molecules, in the interlayer galleries. The compounds of the hydrotalcite group show a wide range of the possible applications due to their specific properties, such as their large surface area, ion exchange ability, the insolubility in water and most of the organic sorbents, and others. Affordability, wide possibilities of manufacturing, and presence of sufficient natural deposits make hydrotalcites potentially very useful for the construction industry, as either a building material itself or an additive in mortars, concrete or in polymers composites used in constructions. Similar possible application of such material is in leakage control in a radioactive waste repository. The effect of use of these materials for ion exchange, anti-corrosion protection, radioactive ions containment, and similar purposes in building materials is examined in this review.

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Application of Zn/Al layered double hydroxides for the removal of nano-scale plastic debris from aqueous systems

Cited by 107 publications

References 57 publications

Investigations on the Thermodynamics Characteristics, Thermal and Dielectric Properties of Calcium-Activated Zinc-Containing Metallurgical Residues

Investigations on the Thermodynamics Characteristics, Thermal and Dielectric Properties of Calcium-Activated Zinc-Containing Metallurgical Residues

How to Build a Microplastics‐Free Environment: Strategies for Microplastics Degradation and Plastics Recycling

Hydrotalcites in Construction Materials

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