Influence Factors on Removal of Cadmium by Montmorillonite Supported Nano Zero-Valent Iron

Abstract

The montmorillonite supported nanozero-valent iron material (MT-NZVI) was synthesized to remove cadmium (Cd). The results showed that the removal efficiency of MT-NZVI on cadmium was much higher than that of montmorillonite (MT), and the removal efficiency of MT-NZVI on cadmium reduced with the increase of the initial concentration and the pH value, but increased with the increase of the dosage.

From Nano Zero-Valent Iron to Nanocomposite Materials for Sustainable Water Treatment

“…Clay minerals, as rich natural resources, have been used for the remediation of contaminated water, with similar advantages such as low cost, high availability, and high specific surface area [35]. Common clay minerals that have been used as substrates are mainly bentonite [36][37][38][39][40][41][42][43][44][45][46], montmorillonite [47][48][49][50][51][52][53][54][55], kaolin [37,40,53,[56][57][58][59][60][61], sepiolite [62][63][64], zeolite [65,66], and attapulgite [67]. Clay minerals attract contaminants to the surface, and the addition of nZVI particles multiplies the active sites and increases their activity [68,69].…”

“…The removal of Cu was studied by Uzum et al (2009), Liu et al, (2013), Chang et al (2014), J. Wang et al (2015), and Yang et al (2018), with a maximum reported yield of 886 mg/g nZVI by Chang et al (2014) [26,53,56,79,88]. Cd was studied by Pang et al (2013), Liu et al (2013), Z. Li et al (2018), and Shi et al (2019), and the maximum removal of 46 mg/g nZVI was determined by Z. Li et al[45,47,71,88].…”