Enhanced Cr(vi) removal by hierarchical CoFe₂O₄@SiO₂–NH₂via reduction and adsorption processes

Abstract

In order to highly effective removal of toxicity Cr (VI), 3D porous CoFe2O4@SiO2-NH2 has been successfully fabricated. As expected, the saturated adsorption capacity of the resulting CoFe2O4@SiO2-NH2 composite toward Cr...

Developing a biocatalyst showcasing the synergistic effect of rice husk biochar and bacterial cells for the removal of heavy metals

“…utilized mesoporous carbon for the removal of lead and copper, 10 while Zhou et al employed hierarchical magnetic CoFe 2 O 4 @SiO 2 –NH 2 as a promising adsorbent for Cr( vi ) removal. 12 Despite the use of commercial adsorbents, there is an increasing need for developing highly efficient and economical materials for metal adsorption. A sustainable remediation method should exhibit high pollutant removal performance, economical, simple operation, and environment-friendly processes.…”

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

“…The Cr(VI)-removal performance could be promoted by combining the excellent adsorption effects and the reduction properties. Fe-ethylene glycol complex microspheres [136], mesoporous amino-group-functionalized iron/silica hollow spheres (Fe/SiO2-NH2 HSs) [137] and 3D porous CoFe2O4@SiO2-NH2 [138] have been applied in Cr(VI)-contaminated-water remediation. To realize the resourceful utilization of industrial waste, the Fe-P slag was employed as a reductive agent for Cr(VI) removal by a simplified industrial procedure, providing some new and feasible thoughts for the resourceful utilization of industrial waste in Cr wastewater treatment [139].…”

“…FeMnOx/MWCNTs C0 = 50 mg/L; adsorbent dose: 1 g/L; contact time: 60 min; pH: 2.0 47.25 mg/g [34] Cr(III) GO@CZ C0 = 30 mg/L; adsorbent dose: 300 mg/L; contact time: 60 min; pH = 7.0 285.71 mg/g [43] Cr(VI) Gr-Si-PPy C0 = 100 mg/L; adsorbent dose: 400 mg/L; T = 25 °C; contact time: 60 min; pH: 2.0 429.2 mg/g [47] Cr(VI) GO@SiO2@C@Ni-400 C0 = 20 mg/L; T = 25 °C; adsorbent dose: 0.15 g/L; pH = 3.0 299.20 mg/g [50] Cr(VI) GO-NiFe LDH C0 = 20 mg/L; T = 30 °C; contact time: 280 min; adsorbent dose: 80 mg/L 53.6 mg/g [51] Cr(VI) Fe3O4-GO C0 = 600 mg/L; T = 25 °C; adsorbent dose: 125 mg/L; pH = 6.0 280.6 mg/g [55] Cr(VI) TSGA C0 = 50 mg/L; T = 25 °C; adsorbent dose: 800 mg/L; contact time: 40 min; pH = 2.0 100% removal [60] Cr(VI) APTES-NPSi C0 = 200 mg/L; T = 25 °C; adsorbent dose: 5 mg; contact time: 180 min; pH = 2.0 103.75 mg/g [64] Cr(VI) MnFe-LDH/MnFe2O3@3DNF C0 = 300 mg/L; T = 25 °C; contact time: 120 min; adsorbent dose: 5 mg; pH = 2.0 564.88 mg/g [121] Cr(VI) 3D porous CoFe2O4@SiO2-NH2 C0 = 150 mg/L; contact time: 600 min; adsorbent dose: 1 g/L; T = 25 °C; pH = 2.0 126.8 mg/g [138] Cr(VI) TCMR C0 = 150 mg/L; contact time: 360 min; adsorbent dose: 2 g/L; T = 25 °C; pH = 5.0 27.04 mg/g [150] Cr(VI) Rice husk C0 = 100 mg/L; contact time: 60 min; adsorbent dose: 50 g/L; T = 25 °C; pH = 5.0-6.0 30 mg/g [158] Cr(VI) BCS and BCW C0 = 320 mg/L; contact time: 24 h; adsorbent dose: 4 g/L; T = 25 °C; pH = 2.0 24.6 mg/g for BCS, 23.6 mg/g for BCW [159] Cr(VI) SDBC C0 = 100 mg/L; contact time: 24 h; adsorbent dose: 1 g/L; T = 25 °C; pH = 5.0 688~738 μmol/g [161] Cr(VI) ZBC C0 = 100 mg/L; contact time: 600 min; adsorbent dose: 4 g/L; T = 25 °C; pH = 1.0 33.87 mg/g [175] Cr Cr(VI) Co/Zn-based ZIF C0 = 15.0 mg/L; contact time: 30 min; adsorbent dose: 33 mg; T = 25 °C; pH = 6.5 69.4 mg/g [191] Cr(VI) NH2-SBA-15 C0 = 25.0 mg/L; contact time: 4 h; adsorbent dose: 100 mg; T = 30 °C; pH = 2.0 Removal efficiency of 88% [192] Cr(VI) Ficus carica bast fiber C0 = 350.0 mg/L; contact time: 210 min; adsorbent dose: 0.5 g; T = 25 °C; pH = 3.0 19.68 mg/g [193] Cr(VI) and Cr(III)…”