Recent progress of arsenic adsorption on TiO 2 in the presence of coexisting ions: A review

Removal of arsenic from alkaline process waters of gold cyanidation by use of Fe3O4@SiO2@TiO2 nanosorbents

“…Moreover, the point of zero charge (PZC) of the Fe 3 O 4 @SiO 2 @TiO 2 nanosorbent was determined to be at a pH value of approximately 4.0. This is similar to the value of 4.5 reported for amorphous TiO 2 by Yan et al (2016), and indicates that the surface of the adsorbent is negatively charged in the alkaline pH range studied here. Therefore, from the point of view of surface interactions driving the adsorption process, electrostatic attraction hardly exists in the studied adsorption system.…”

Synthesis of sewage sludge‐based carbon/TiO2/ZnO nanocomposite adsorbent for the removal of Ni(II), Cu(II), and chemical oxygen demands from aqueous solutions and industrial wastewater

“…In recent studies, the various nanoparticles have been used to remove the metal ions and organic pollutants from aqueous solutions (Grillo, Rosa, & Fraceto, 2015;Hua et al, 2012;Karri, Tanzifi, Yaraki, & Sahu, 2018;Koduru, Karri, & Mubarak, 2019;Lingamdinne, Koduru, & Karri, 2019;Tyagi, Gupta, Sadegh, Ghoshekandi, & Makhlouf, 2017). Among various nanoadsorbents, the TiO 2 nanoparticles due to its unique physico-chemical properties such as high surface area, mechanical stability, and chemical resistivity as well as low cost have been reported as an adsorbent with a high adsorption capacity in environmental applications (Razzaz, Ghorban, Hosayni, Irani, & Aliabadi, 2016;Yan, Hu, & Jing, 2016). On the other hand, zinc (II) oxide (ZnO) nanoparticles with high surface area and ion exchange properties have been investigated as an alternative adsorbent for metal ion sorption (Mahdavi et al 2012;Prasad & Jha, 2009;Sheela, Nayaka, Viswanatha, Basavanna, & Venkatesha, 2012).…”

Mechanistic study of simultaneous arsenic and fluoride removal using granular TiO2-La adsorbent

“…4c and d). TiO 2 -La exhibited a wide pH application range (3)(4)(5)(6)(7)(8)(9), removing >90% of As(III) and 95% of F with their initial concentrations at 2.5 mg/L. When the initial concentrations were increased to 25 mg/L and 250 mg/L, an M-shaped curve for As(III) adsorption was observed with two adsorption maxima at pH's of about 4.8 and 8.5 (Fig.…”

“…As the World Health Organization (WHO) suggests, the drinking water standards for As and F are 10 lg/L and 1.5 mg/L, respectively. However, reaching this WHO standard is still a great challenge, especially in low income and heavily contaminated areas, due to the lack of proper treatment [4,5]. Therefore, highly efficient simultaneous removal of As and F is of great urgency and high priority.…”

“…Therefore, the preparation and characterization of adsorptive media becomes the first and foremost step in water treatment using adsorption technology. TiO 2 has been successfully used as an adsorbent for As removal from drinking water and wastewater [5,[10][11][12]. Activated alumina (AA) is an EPA standard and a widely used adsorbent for defluoridation.…”