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Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles
นักวิจัย : Goh, Kok Hui , Lim, Teik-Thye , Banas, Agnieszka , Dong, Zhili
คำค้น : DRNTU::Engineering::Materials
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2553
อ้างอิง : Goh, K. H., Lim, T. T., Banas, A., & Dong, Z. (2010). Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles. Journal of Hazardous Materials, 179(1-3), 818-827. , 0304-3894 , http://hdl.handle.net/10220/8869 , http://dx.doi.org/10.1016/j.jhazmat.2010.03.077
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of hazardous materials
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The sorption ability of fast-coprecipitated and hydrothermally-treated Mg/Al layered double hydroxide nanoparticles (FCHT-LDH) for various oxyhalides and oxyanions was evaluated. Interactions of oxyhalide such as monovalent bromate or oxyanions such as divalent chromate and divalent vanadate with FCHT-LDH were investigated using a combination of macroscopic (batch sorption/desorption studies and electrophoretic mobility (EM) measurements) and microscopic techniques (CHNS/O, XRD, FTIR, XPS, and EXAFS analyses). The sorption studies on various oxyanions and oxyhalides suggested that their sorption characteristics on FCHT-LDH were largely governed by their ionic potentials and molecular structures. Oxyanions which have ionic potentials higher than 7 nm−1 were found to be more readily sorbed by FCHT-LDH than oxyhalides with ionic potentials lower than 5 nm−1. The results obtained also demonstrated that trigonal pyramid oxyhalides showed a lower degree of specificity for FCHT-LDH than the tetrahedral coordinated oxyanions. From the macroscopic and microscopic studies, monovalent oxyhalide sorption on FCHT-LDH was postulated to occur mainly via anion exchange mechanism with subsequent formation of outer-sphere surface complexes. For polyvalent oxyanion sorption on FCHT-LDH, the mechanisms were possibly associated with both anion exchange and ligand exchange reactions, resulting in the coexistence of outer-sphere and inner-sphere surface complexes.

บรรณานุกรม :
Goh, Kok Hui , Lim, Teik-Thye , Banas, Agnieszka , Dong, Zhili . (2553). Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Goh, Kok Hui , Lim, Teik-Thye , Banas, Agnieszka , Dong, Zhili . 2553. "Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Goh, Kok Hui , Lim, Teik-Thye , Banas, Agnieszka , Dong, Zhili . "Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2553. Print.
Goh, Kok Hui , Lim, Teik-Thye , Banas, Agnieszka , Dong, Zhili . Sorption characteristics and mechanisms of oxyanions and oxyhalides having different molecular properties on Mg/Al layered double hydroxide nanoparticles. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2553.