Synthesis of polyethylenimine-functionalized poly(glycidyl methacrylate) magnetic microspheres and their excellent Cr(VI) ion removal properties

Removal of Cr(VI) and Toxic Ions from Aqueous Solutions and Tannery Wastewater Using Polymer-Clay Composites

“…The highest removal efficiency of Cr(VI) for all the investigated sorbents (raw and polymerized sorbents of zeolite and naturally occurring local clay deposit) was pronounced for the lowest initial solution pH of 2. It has been reported that the sorbents' surfaces that are positively charged are predominant under acid conditions, which are easily attracted toward negatively charged chromium species (HCrO 4 and Cr 2 O 4 2− ) [31,32]. Therefore, the maximum removal efficiency was pronounced for a pH value of 2.…”

Magnetic adsorbents for the treatment of water/wastewater—A review

“…The removal effectiveness of 99.3% could be reached with initial Cr(VI) concentration of 10 mg/L. PEI was grafted on the surface of PGMA microspheres to form m-PGMA-PEI microspheres by Sun et al [114]. The adsorption process was favourable under acidic conditions and the maximum adsorption capacity was 362.7 mg/g at pH 2.…”

Combination of carboxymethyl chitosan-coated magnetic nanoparticles and chitosan-citrate complex gel beads as a novel magnetic adsorbent

“…Therefore, magnetite (Fe 3 O 4 ) is considered a promising magnetic material because it possesses a large surface area and excellent magnetic properties. In recent years, Fe 3 O 4 magnetic nanoparticles have been functionalized with various stabilizers, including organic or inorganic compounds (Hao, Man, & Hu, 2010;Kim, Lee, Chang, & Chang, 2013), polypeptides (Takahashi, Yoshino, & Matsunaga, 2010), polysaccharides (Chang, Yu, Ma, & Anderson, 2011;Zamora-Mora et al, 2014), activated carbon (Ai, Huang, Chen, Wei, & Jiang, 2010), silica or silanes (Badruddoza et al, 2013a;Zhang, Cheng, He, Chen, & Zhang, 2010), clay (Szabo et al, 2007), synthetic polymers (Sun et al, 2013), and ␤-cyclodextrin (Badruddoza et al, 2013b;Zhang, Wang, & Yang, 2014). Magnetic nanoparticles have attracted considerable attention because of their unique properties in the removal of several heavy metal or toxic ions (Lin, Zhang, Chen, & Qian, 2012;Wang et al, 2012).…”