Synthesis of NH2-MCM-41 Nano Porous Adsorbent and Using it for Zn and Ag Metals Removal from Aqueous Solutions by Adsorption Method and Studying Effect of Some Physicochemical Parameters on it

Abstract

In this study we have investigated removal of Zn and Ag Ions from aqueous solutions. Industrial pollutions by heavy metals ions as Ag and Zn is a universal environmental problem, because of their toxicity. Thus, we have studied removal of these ions by NH 2 -MCM-41 nano porous adsorbent at room temperature. This adsorbent has a high surface area, high adsorption ability, high factor of porosity and wide porous. In the batch experiment we have taken 150 cm -3 of considered metallic ion aqueous solution. After pH adjustment, nano porous absorbent was added and it was agitated by a rotary shaker. Then, pH, amount of adsorbent, initial concentration of metallic ion, time of contact and temperature parameters have determined. Thus, recovery of Ag and Zn metallic ions at pH = 7, adsorbent dose of 2 g/dm 3 and room temperature obtained 96.93 and 99.24%, respectively. Thermodynamic results indicate that adsorption process is endothermic and spontaneous. Obtained adsorption isotherm was fitted by Langmuir's adsorption isotherm which is single-layer adsorption. Moreover, this removal process has a second order kinetic. Synthesized adsorbent was characterized by FT-IR, SEM and XRD.

Synthesis of chitosan and amine functionalized MCM‐41 nanocomposite for the removal of acetylsalicylic acid from water using central composite design

“…As can be seen in Figure 4a, MCM‐41‐APS NCs are spherical and uniform. [ 33 ] When MCM‐41‐APS was modified with Cs and cross‐linked with glutaraldehyde, the NC formed like a film with particles of MCM‐41‐APS (Figure 4b,c). Figure 4d shows the Energy‐dispersive x‐ray spectroscopy (EDS) and elemental mapping of NC.…”

“…Therefore, the negatively charged carboxyl groups in aspirin can increase its hydrophilic groups, which increases its adsorption by NC. [ 33 ] Although the strong electrostatic attraction between the positive charges of the drug molecules leads to the high value of the drug adsorption, under neutral and alkaline conditions, the number of positive charges and negative charges of the sites decreased, which resulted in a decrease in the drug removal process. On the other hand, as previously mentioned, pH PZC value in adsorbent material was very important.…”

“…Moreover, by increasing contact time, aspirin removal from water was enhanced. [ 33 ] Also, when the initial concentration of the aspirin changes from 15 to 75 mg L −1 , the removal efficiency decreased nearly from 83% to 55%. This decrease is probably due to saturation of the available active surface sites by aspirin molecule, as can be seen in Figure 7.…”

“…[32] 3.3 | FE-SEM and EDX analysis As can be seen in Figure 4a, MCM-41-APS NCs are spherical and uniform. [33] When MCM-41-APS was modified with Cs and cross-linked with glutaraldehyde, the NC formed like a film with particles of MCM-41-APS (Figure 4b,c).…”

Facile Synthesis, Characterization of Poly-2-mercapto-1,3,4-thiadiazole Nanoparticles for Rapid Removal of Mercury and Silver Ions from Aqueous Solutions

“…On the basis of a careful comparison of the Ag + and Hg 2+ adsorbability onto several typical adsorbents including inorganics (such as carbon, silica and Fe 3 O 4 ), natural bio-polymers (such as chitosan, cellulose, yeast, and wool), organic polymers, and inorganic-organic composites summarized in Table 4 , the PTT nanoparticles have an even stronger adsorbability toward Ag + and Hg 2+ ions than most of the other adsorbents reported hitherto to the best of our knowledge. The Ag + adsorption capacity of PTT is about 5–7 times that of activated carbon [ 30 ], cellulose nanocrystals [ 55 ], and waste yeast [ 56 ] and 2.4 times that of silica nanoparticles modified with trithiocyanuric acid [ 21 ], and is still obviously superior to that of others [ 26 , 34 , 36 , 57 ]. The PTT nanoparticles also exhibit much higher Hg 2+ adsorption capacity than poly(hydroxyethylmethacrylate/chitosan) membranes [ 58 ] and poly(1-amino-5-chloroanthraquinone) [ 18 ], and have still obviously higher Hg 2+ adsorption capacity when compared with others [ 33 , 35 , 59 , 60 , 61 ].…”