Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes

Adsorptive removal of arsenic from aqueous solution by zeolitic imidazolate framework-8 (ZIF-8) nanoparticles

“…However, large amounts of Zn 2+ were released into water from the sorbent at acidic condition, which dramatically hindered the adsorption of arsenic. SO 4 2− and NO 3 − had no significant effect on the arsenic adsorption while the adsorption was significantly inhibited by PO 4 3− and CO 3 2− . X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy analysis revealed that electrostatic attraction and hydroxyl and amine groups on ZIF-8 surface played vital roles in the adsorption process.…”

“…Adsorption is considered to be one of the most promising approaches due to low cost, easy maintenance and high efficiency [2]. Various types of sorbents have been reported in arsenic removal; however, the adsorption capacity of conventional sorbents is generally limited by their chemical properties and irregular pore structures [4].…”

Uklanjanje arsena iz vodenih rastvora primenom modifikovanog otpadnog PET-a

“…Sinteza adsorbenta, odnosno modifikacija PET-a izvršena je postupkom prikazanim u literaturi [11]. Prva faza sinteze novog adsorbenta je predtretman otpadnog PET-a koji obuhvata: mehaničko mlevenje i odvajanje uniformnih frakcija, nepotpunu hidrolizu sumpornom i azotnom kiselinom, tretman sa etilendiaminom uz zagrevanje, a zatim smešom za redukciju koja se sastoji od koncentrovane hlorovodonične kiseline i opiljaka gvožđa (e-PET).…”

“…Oksidacija Fe(II) jona izvršena je dodatkom ekvimolarne količine KMnO 4 u neutralnoj sredini sa ciljem precipitacije α-MnO 2 i dobijanja binarne strukture getit/α-MnO 2 metalnih oksida. Nakon dvočasovnog mešanja, disperzija je profiltrirana, isprana dejonizovanom vodom, a dobijeni materijal je sušen u vakuum sušnici 8 h na 40 °C [11].…”

“…Negativne vrednosti entropije (ΔS 0 ) ukazuju da proces adsorpcije uključuje asocijativne mehanizme. Tokom adsorpcije dolazi do formiranja aktiviranog kompleksa između adsorbata i adsorbenta [11]. Takođe, pokazuje da se tokom procesa dešavaju značajne promene na unutrašnjoj strukturi adsorbenta.…”