Fabrication of Fe-coordinated diamino-functionalized SBA-15 with hierarchical porosity for phosphate removal

Abstract

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract: Hierarchically macroporous-mesoporous SBA-15 phosphate adsorbent was synthesized via a dual-templating approach, followed by diamino-functionalization and Fe(III)impregnation. The resulting Fe(III)-coordinated diamino-functionalized macroporousmesoporous adsorbent possessed well-defined and interconnecting macroporous and mesoporous networks. Its maximum adsorption was 12.7 mg/g, which was 86.8% greater than that of Fe(III)-coordinated amino-functionalized mesoporous SBA-15. In the kinetic study of macroporous-mesoporous adsorbent, 92.5% of the final adsorption capacity reached in the first 1 min; and the adsorption followed the pseudo-second-order equation well, suggesting the presence of chemisorption. The pH ranging from 3.0 to 6.0 favored the high phosphate adsorption of hierarchically porous adsorbent; however, the coexistence of other anions, especially F -, retarded the adsorption.

Modeling of Experimental Adsorption Isotherm Data

“…However, the efforts for exploiting new adsorbents, improving the removal efficiency of adsorbents and developing an ideal adsorption system have never been stopped. Recently, researchers found that functionalized mesoporous silica materials, such as Fe(III)-coordinated amino-functionalized SBA-15, have exhibit enhanced phosphate removal capacity, due to their large surface areas, accessible Fe(III) active sites as well as controllable pore sizes and arrangements [8,9].…”

Adsorption removal of Congo red over flower-like porous microspheres derived from Ni/Al layered double hydroxide

“…29,30 In particular, the hollow particles with a controlled interior void space and mesoporous shell structure have exhibited a number of advantageous features, including a low density, high surface area, stability, and surface permeability; thus facilitating use as high-performance adsorbents.…”

Adsorption Studies of Zn (II) onto Nano- Biomaterials from Aqueous Media

“…Study the FT-IR spectrum of β-TCP/PLGA before and after 37 0 C incubation was carried out. The absorption bands at maximum values were 1094, 1034,603 and 564 cm -1 , from phosphate group [ 23], β-TCP. The approximately band at 3420 cm -1, as the result of OH --group and H + bonds at 1420 and 631 Cm -1 as the result of OH was attributed to the bending vibrations of OH-group.…”