Silver/quartz nanocomposite as an adsorbent for removal of mercury (II) ions from aqueous solutions

Abstract

Silver nanoparticles (AgNPs) and silver/quartz nanocomposite (Ag/Q)NPs)) were synthesized by sol-gel method using table sugar as chelating agent. The synthesized nanosized materials were used for mercury ions adsorption from aqueous solutions. The materials were characterized by X-ray diffraction (XRD), Transmission Electron microscope (TEM), and surface area (BET). Adsorption of Hg2+ (10 mg/l) is strongly dependent on time, initial metal concentration, dose of adsorbent and pH value. Silver/quartz nanocomposite ((Ag/Q)NPs)) shows better efficiency than individual silver nanoparticles (AgNPs). This composite removed mercury ions from the aqueous solution with efficiency of 96% at 60 min with 0.5g adsorbent dosage at pH 6. The adsorption process explained well by the pseudo-second-order kinetic model. In conclusion silver/quartz nanocomposite (Ag/Q)NPs)) shows higher removal efficiency for mercury ions from aqueous solutions than individual silver naoparticles (AgNPs) or quartz (Q).

Biogenic and chemically synthesized Solanum tuberosum peel–silver nanoparticle hybrid for the ultrasonic aided adsorption of bromophenol blue dye

“…Notwithstanding, the nanoparticles provide additional surface characteristics to the biosorbents, which are known to influence their surface interaction with the adsorbate. Similar findings have been documented in the removal of mercury(II) contaminants from wastewater, by a silver/quartz nano-composite adsorbent 50 . The thermal stability of adsorbent materials is important as it provides information on their behaviour under various temperature conditions.…”

“…Notwithstanding, the nanoparticles provide additional surface characteristics to the biosorbents, which are known to influence their surface interaction with the adsorbate. Similar findings have been documented in the removal of mercury(II) contaminants from wastewater, by a silver/quartz nano-composite adsorbent 50 .

Figure 3 ( a ) Nitrogen adsorption–desorption isotherm of the STpe-AgNP hybrid, investigating the S BET specific surface area and pore volume; and ( b ) Thermo-gravimetric analysis (TGA) of both adsorbents, showing their thermal stability.

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Adsorption of Cr(VI), Ni(II), Fe(II) and Cd(II) ions by KIAgNPs decorated MWCNTs in a batch and fixed bed process

“…Wastewater is a major public health problem which are generated from chemical industries such as battery, metal plating, cosmetics, pharmaceuticals, plastic and textiles 1 – 3 . The wastewater contains various pollutants, including potentially toxic metals which are detrimental to humans, animals and aquatic organisms.…”

Synthesis and Antibacterial Activity of (AgCl, Ag)NPs/Diatomite Hybrid Composite

“…The necessary conditions for the synthesis of silver nanoparticle composites based on mineral substrates such as quartz [5][6][7][8], talc [9], diatomite [2,10,11], kaolinite [12], montmorillonite [13][14][15][16], zeolite [17][18][19] and mesoporous silica [20,21] have been established. The formation of silver nanoparticles on the surface of mineral substrates can be obtained by ion exchange in silver nitrate solution and further reduction by different methods, such as thermal treatment [16], UV-irradiation, which allows the regulation of the size of nanoparticles by manipulating irradiation parameters [22], methods of hydrothermal synthesis [19] and sonochemical reduction [14,20], as well as by using wet reduction methods [23][24][25][26][27][28][29][30][31][32].…”

“…The practical applications of such composites may be various. Silica-based composites are used as an adsorbent for purifying water from mercury ions [6], in catalytic systems [7] and as antibacterial biofilms [8]. Montmorillonite-based nanocomposites (Ag/MMT) were applied in biopolymer matrices for packaging materials [16].…”