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@ARTICLE{Tang:910733,
      author       = {Tang, Ni and Liu, Xue and Jia, Meng-Ru and Shi, Xin-Yao and
                      Fu, Jing-Wei and Guan, Dong-Xing and Ma, Lena Q.},
      title        = {{A}mine- and thiol-bifunctionalized mesoporous silica
                      material for immobilization of {P}b and {C}d:
                      {C}haracterization, efficiency, and mechanism},
      journal      = {Chemosphere},
      volume       = {291},
      issn         = {0045-6535},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-04103},
      pages        = {132771 -},
      year         = {2022},
      abstract     = {In this study, a two-step functionalizing strategy by
                      combining co-condensation with grafting procedures was
                      employed to synthesize well-ordered Amino- and
                      Thiol-Bifunctionalized SBA-15 (ATBS) mesoporous silica. Its
                      physicochemical properties, performance, and mechanisms in
                      immobilization of toxic metals Pb and Cd in water and soil
                      were investigated. After bi-functionalization, X-ray
                      diffractometer, transmission electron microscope, and N2
                      adsorption-desorption measurements confirmed that the ATBS
                      maintained a highly-ordered mesoporous structure, large
                      surface area and pore volume. The elemental analysis,
                      Fourier transform infrared spectroscopy and X-ray
                      Photoelectron Spectroscopy (XPS) evidenced the successful
                      incorporation of amine and thiol groups into ATBS. These
                      structure and functional characteristics of ATBS benefited
                      Pb and Cd sorption. Sorption isotherms of Pb and Cd were
                      better fit with Sips and Redlich-Peterson models. Sorption
                      kinetics suggested that Pb sorption was mainly regulated by
                      chemical reactions, whereas both diffusion process and
                      chemical reactions were rate-regulating steps in Cd
                      sorption. ATBS showed the maximum sorption capacities for Pb
                      and Cd at 120 and 38 mg g−1, respectively. The sorption
                      mechanisms revealed by XPS measurements suggested that Cd
                      sorption was mainly attributed to thiol groups while Pb was
                      efficiently bond to both thiol and amino groups. High and
                      stable sorption efficiencies were attained in the pH range
                      of 4–6, with a higher affinity towards Pb than Cd.
                      Furthermore, its ability to immobilize Pb and Cd in soils
                      was examined with an incubation experiment, which showed
                      that ATBS reduced $30–56\%$ of MgCl2-extractable Pb and Cd
                      in a contaminated soil. The synthesized sorbent via the
                      two-step functionalizing strategy shows high sorption
                      efficiency towards Pb and Cd, and thus it has potential
                      application in remediating Pb and Cd contaminated water and
                      soils.},
      cin          = {IBG-3},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {34740698},
      UT           = {WOS:000757882300008},
      doi          = {10.1016/j.chemosphere.2021.132771},
      url          = {https://juser.fz-juelich.de/record/910733},
}