Study on Simultaneous Removal of Dye and Heavy Metal Ions by NiAl-Layered Double Hydroxide Films

Abstract

Herein, nickel-aluminum-layered double hydroxide (NiAl-LDH) films were prepared by the hydrothermal method. Based on the photoinduced reduction ability and degradation of LDHs on heavy metal ions and organic compounds, NiAl-LDH films displayed favorable simultaneous removal performance. Benefiting from the electron traps of heavy metals reduced from solution, the coexisting metal ions improved the photocatalytic activity of NiAl-LDH films on methyl orange. The higher the Fermi level of coexisting metal ion was, the higher the photocatalytic degradation rate of methyl orange obtained. Meanwhile, the removal rates of heavy metal ions (Ag + , Pb 2+ , and Cu 2+ ) from wastewater were both enhanced and could reach 95%. NiAl-LDH films showed affinity toward Ag + . Furthermore, NiAl-LDH films are tightly coupled with the substrate, providing active sites and a simple method for the catalyst recovery. This study provides new insights into the simultaneous removal of heavy metal ions and organic pollutants using LDH films.

M2+(Ni, Cu, Zn)/Al-LDH Composites with Hydrochar from Rambutan Peel and Study the Adsorption Efficiency for Organic Dyes

“…Based on Table 2, the adsorption process tends to follow the Freundlich isotherm according to the linear coefficient value (R 2 ) which is closer to 1. Freundlich isotherm is an adsorption process following adsorption by multilayer adsorption and Freundlich can also describe physical adsorption (Wang et al, 2020) is supported by a value of 1/n<1 (Table 2) as the intensity of multilayer adsorption of adsorbate molecules on the surface of a heterogeneous material (Binh and Nguyen, 2020). The comparison of MB adsorption for several adsorbents is presented in Table 3.…”

Remarkable damage in talc caused by electron beam irradiation with a dose of up to 1000 kGy: lattice shrinkage in the Z- and Y-axis and corresponding intrinsic microstructural transformation process speculation

“…This notion has been veried adequately, as exfoliation, intercalation and ion-exchange mainly occurring in this direction. [13][14][15][16][17][18][19][20][21][22][23][24][25][26] These descriptions probably explain the observed discrepancy. Normally, discrepancy can be amplied by factor elevation; thus, the ratio seems to increase greatly.…”

Copper Immobilized on Modified LDHs as a Novel Efficient Catalytic System for Three-Component Synthesis of Pyrano[2,3-d]pyrimidine and pyrazolo[4′,3′:5,6]pyrano[2,3-d]pyrimidine Derivatives

“…LDHs can be used as an attractive base in various applications, such as medical, pharmaceutical, sensors, and drug delivery. As a result, they have attracted a lot of attention. − LDHs have a layered structure, which is also called hydrotalcite; it consists of divalent and trivalent cations, whose general formula is [Me 2+ (1 – x ) Me 3+ x (OH) 2 ] x +(An – ) x / n n •H 2 O. , It is possible to change cations and anions, which may affect the properties of the layers. Today, layered double hydroxides are excellent supports for various catalysts due to the numerous hydroxide groups on their surface. − …”