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Layered Double Hydroxides (LDH), also known as hydrotalcite-like compounds, represent a versatile class of two-dimensional anionic clay materials with the general formula [M²⁺₁₋ₓM³⁺ₓ(OH)₂]ˣ⁺[Aⁿ⁻ₓ/ₙ•mH₂O]ˣ⁻. Their unique structure consists of positively charged brucite-like hydroxide layers containing divalent (Mg²⁺, Zn²⁺, Ni²⁺, Co²⁺) and trivalent (Al³⁺, Fe³⁺, Cr³⁺) metal cations, with exchangeable anions (CO₃²⁻, NO₃⁻, SO₄²⁻, Cl⁻) and water molecules occupying the interlayer galleries.
Nanjing Mission New Materials Co.,Ltd classifies industrial LDH products by three primary criteria: metal cation composition (binary, ternary, or quaternary systems), interlayer anion type (carbonate, nitrate, or organic-modified), and application-specific morphology (powder, colloidal dispersion, or supported composites). Unlike electrically neutral MXene nanosheets or porous MOF frameworks, LDH's inherent positive surface charge enables exceptional anion exchange capacity (2-5 meq/g) and adjustable interlayer spacing, making them uniquely suited for adsorption, catalysis, and polymer stabilization applications.
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