Glass beads immobilized doped TiO2 NPs with enhanced adsorption efficiency for arsenic(III) from aqueous solution

Abstract

Visible light driven metals (Gd and Tl) doped TiO 2 nanoparticles (NPs) were prepared using low cost and facile liquid impregnation method. The prepared NPs were characterized using XRD, SEM/EDX, BET surface area analysis, particle size distribution analyzer, UV-Vis DRS and pH of point of zero charge (pH PZC) analyses. The crystalline phases observed were purely anatase with the particles size ranged between 24 and 30 nm possessing large surface area (74 m 2 /g) and pore size (12 nm). The reductions in the band gap energy for both the dopant systems were observed and absorption edges were extended to the visible region. The prepared NPs exhibited good photo-induced adsorption affinity for the As(III) from aqueous solution under natural pH of As(III) solution, ambient temperature and normal household compact fluorescent light. The metals-doped NPs showed high removal efficiency (up to 99%) towards As(III) compared to pure TiO 2 NPs (68%). In addition, the glass beads immobilized photocatalyst not only enhanced the efficiencies by increasing the active surface area of NPs, but also overcome the post-reaction separation steps. The regeneration study indicated that the physical regeneration is more significant for the reutilization of photocatalysts.

A Composite of TiO2 Quantum Dots and TiO2 Nanoparticles Coated on Anti-Bumping Glass Beads (TiO2QDs-TiO2NPs/GBs), with a Very Low Content of TiO2 as a High Performance Photocatalyst

“…For example, the high activity of the immobilized TiO 2 on GBs with more than 96% conversion of the MB (at 90 min of reaction time) was reported by Cunha et al [3]. Towards the goal of As (III) treatment in wastewater, Saqib et al [4] developed the high-activity photocatalysts based on GBs immobilized and TiO 2 NPs doped with conversion of 99%. Te outstanding advantage of the catalyst is that it can be easily separated from the reaction medium.…”

Spectrophotometric Quantification of Trace Elements and Toxic Metals in Raw Milk Samples of Peshawar City, Pakistan

“…Contamination of various food items including raw milk with heavy metals like Cu, Fe, Zn, Mn, Cd and Pb is becoming a serious problem due to their penetration into the food chains (R. Muhammad, Najm, Fazal, Nadir, & Luqman, 2020;Rahim & Mas Haris, 2015). Heavy metals like Cd and Pb are non-essential and toxic elements even at trace levels due to their persistent, bioaccumulative and non-biodegradable nature (Rahim & Mas Haris, 2019;Saqib, Khan, Alam, & Rahim, 2020). The contamination of milk with Cd and Pb is a serious health concern, especially in infants and children as the young absorb these metals more readily than adults (Ahmad, Rahim, & Haris, 2014;Rahim, Imdad, Adnan, Haris, & Nisar, 2014).…”

Spectrophotometric Quantification of Trace Elements and Toxic Metals in Raw Milk Samples of Peshawar City, Pakistan

“…Contamination of various food items including raw milk with heavy metals like Cu, Fe, Zn, Mn, Cd and Pb is becoming a serious problem due to their penetration into the food chains (R. Muhammad, Najm, Fazal, Nadir, & Luqman, 2020;Rahim & Mas Haris, 2015). Heavy metals like Cd and Pb are non-essential and toxic elements even at trace levels due to their persistent, bioaccumulative and non-biodegradable nature (Rahim & Mas Haris, 2019;Saqib, Khan, Alam, & Rahim, 2020). The contamination of milk with Cd and Pb is a serious health concern, especially in infants and children as the young absorb these metals more readily than adults (Ahmad, Rahim, & Haris, 2014;Rahim, Imdad, Adnan, Haris, & Nisar, 2014).…”