Abstract
Nanomesoporous silica SBA-15 was prepared by hydrothermal method. The samples were characterized by powder X-ray diffraction and scanning electron microscopy. The fibrous particles with a diameter of 333 ± 10 nm were obtained. Nanoporous mesoporous SBA-15 was used as an adsorbent to adsorb Cd2+ in water body. The effects of conditions such as acidity were studied, and the optimized adsorption conditions were obtained. The results showed that when the pH value was 5.0, the temperature was 25 ± 1 °C and the adsorption time was 40 min, the nanomesoporous SBA-15 had the best adsorption effect for Cd2+ and the adsorption rate was reached 73.28% and the adsorption capacity was 9.84 mg/g. Study found that the adsorption is the quasi-second-order kinetic model, which belongs to the Freundlich adsorption type. The results of adsorption thermodynamics showed that when the temperature is 25–55 °C, the adsorption is spontaneous exothermic reaction, ∆G0 < 0, the adsorption enthalpy change ΔH0 = − 54.732 kJ/mol, the adsorption entropy change ∆S0 = − 129.343 J/(mol K). The effects of nitric acid and hydrochloric acid on desorption were investigated, respectively. The results showed that the desorption effect of 0.1 mol/L nitric acid as desorbent was better than that of hydrochloric acid. At desorption for 10 h, the desorption rate was the highest, reaching 65.56%.
Highlights
With the rapid development of economy and society, more and more events on environmental pollution have aroused great concern in the whole society
Nanomesoporous material plays a role in catalytic reactions such as macromolecular adsorption, and it is a good adsorbent for heavy metals, which has been used in the adsorption of Pb(II), Ni(II) ion (Ghorbani et al 2016) and Cu(II) ion (Dana and Sayari 2011)
By observing the XRD diffraction peaks of the sample, it is found that these peaks are in good agreement with those reported in the literature (Zhai et al 2013) and have the typical characteristic peaks of SBA-15
Summary
With the rapid development of economy and society, more and more events on environmental pollution have aroused great concern in the whole society. Applied Water Science (2019) 9:143 prospects, has potential applications in the field of research such as in separation, purification, nanoreactor, sensing devices, chemical synthesis and catalysts, energy, light, electricity and magnetic materials. It has the characteristics of quite high specific surface area, low relative density, high porosity, continuous adjustable pore size in a certain range and good hydrothermal stability. The limitation of pore size deficiency of microporous zeolite molecular sieve was overcome It can adsorb pollutants more effectively, which can be used in environmental purification, adsorption catalysis and other fields. Other treatment methods introduce other substances, the operations are complex, the efficiencies are low, and the costs are high
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