1. L. Zhou, G. Zhang, J. Tian, D. Wang, D. Cai, Z. Wu, Functionalized Fe3O4@C nanospheres with adjustable structure for efficient hexavalent chromium removal, ACS Sustainable Chem. Eng., 5 (2017) 11042–11050.
  2. Y.C. Sharma, V. Srivastava, Comparative studies of removal of Cr(VI) and Ni(II) from aqueous solutions by magnetic nanoparticles, J. Chem. Eng. Data, 56 (2011) 819–825.
  3. S. Zhou, B. Zhang, Z. Liao, L. Zhou, Y. Yuan, Autochthonous N-doped carbon nanotube/activated carbon composites derived from industrial paper sludge for chromate(VI) reduction in microbial fuel cells, Sci. Total Environ., 712 (2020) 136513, doi: 10.1016/j.scitotenv.2020.136513.
  4. R. Pechancová, J. Gallo, D. Milde, T. Pluháček, Ion-exchange HPLC-ICP-MS: a new window to chromium speciation in biological tissues, Talanta, 218 (2020) 121150, doi: 10.1016/j.talanta.2020.121150.
  5. Z. Lv, X. Tan, C. Wang, A. Alsaedi, T. Hayat, C. Chen, Metalorganic frameworks-derived 3D yolk shell-like structure Ni@ carbon as a recyclable catalyst for Cr(VI) reduction, Chem. Eng. J., 389 (2020) 123428, doi:10.1016/j.cej.2019.123428.
  6. C. Xiao, J. Lin, Efficient removal of Cr(VI) ions by a novel magnetic 4-vinyl pyridine grafted Ni3Si2O5(OH)4 multiwalled nanotube, ACS Omega, 5 (2020) 23099–23110.
  7. G. Chen, C. Qiao, Y. Wang, J. Yao, Synthesis of magnetic gelatin and its adsorption property for Cr(VI), Ind. Eng. Chem. Res., 53 (2014) 15576−15581.
  8. J. Tan, Y. Song, X. Huang, L. Zhou, Facile functionalization of natural peach gum polysaccharide with multiple amine groups for highly efficient removal of toxic hexavalent chromium (Cr(VI)) ions from water, ACS Omega, 3 (2018) 17309–17318.
  9. M.A. Salam, M.R. Abukhadra, A. Adlii, Insight into the adsorption and photocatalytic behaviors of an organo-bentonite/Co3O4 green nanocomposite for malachite green synthetic dye and Cr(VI) metal ions: application and mechanisms, ACS Omega, 5 (2020) 2766–2778.
  10. T.D. Ntuli, T.H. Mongwe, L.L. Sikeyi, O. Mkhari, N.J. Coville, E.N. Nxumalo, M.S. Maubane-Nkadimeng, Removal of hexavalent chromium via an adsorption coupled reduction mechanism using olive oil derived carbon nano-onions, Environ. Nanotechnol. Monit. Manage., 16 (2021) 100477, doi: 10.1016/j.enmm.2021.100477.
  11. A. Olad, R. Nabavi, Application of polyaniline for the reduction of toxic Cr(VI) in water, J. Hazard. Mater., 147 (2007) 845–851.
  12. M. Gan, D. Huang, F. Chen, K. Zhang, J. Zhu, Enhanced Cr(VI) reduction and Cr(III) co-precipitation through the synergistic effect between sulfide minerals and chemoautotrophic decomposer, J. Environ. Chem. Eng., 9 (2021) 105942, doi: 10.1016/j.jece.2021.105942.
  13. B. Li, P. Liao, L. Xie, Q. Li, C. Pan, Z. Ning, C. Liu, Reduced NOM triggered rapid Cr(VI) reduction and formation of NOMCr( III) colloids in anoxic environments, Water Res., 181 (2020) 115923, doi:10.1016/j.watres.2020.115923.
  14. M. Wei, G. Jian, C. Zhen, H. Jinglu, X. Gang, P. Yuzhen, Z. Zhe, T. Dazhi, A new method of Cr(VI) reduction using SiC doped carbon electrode and Cr(III) recovery by hydrothermal precipitation, Colloids Surf., A, 610 (2021) 125724, doi: 10.1016/j.colsurfa.2020.125724.
  15. H. Peng, J. Guo, Removal of chromium from wastewater by membrane filtration, chemical precipitation, ion exchange, adsorption electrocoagulation, electrochemical reduction, electrodialysis, electrodeionization, photocatalysis and nanotechnology: a review, Environ. Chem. Lett., 18 (2020) 2055–2068.
  16. R. Goswami, A. Mishra, N. Bhatt, A. Mishra, P. Naithani, Potential of chitosan/nanocellulose based composite membrane for the removal of heavy metal (chromium ion), Mater. Today: Proc., 46 (2021) 10954–10959.
  17. O. Njoya, S. Zhao, X. Kong, J. Shen, J. Kang, B. Wang, Z. Chen, Efficiency and potential mechanism of complete Cr(VI) removal in the presence of oxalate by catalytic reduction coupled with membrane filtration, Sep. Purif. Technol., 275 (2021) 118915, doi: 10.1016/j.seppur.2021.118915.
  18. S. Roy, S. Majumdar, G.C. Sahoo, S. Bhowmick, A.K. Kundu, P. Mondal, Removal of As(V), Cr(VI) and Cu(II) using novel amine functionalized composite nanofiltration membranes fabricated on ceramic tubular substrate, J. Hazard. Mater., 399 (2020) 122841, doi: 10.1016/j.jhazmat.2020.122841.
  19. H. Wang, X. Song, H. Zhang, P. Tan, F. Kong, Removal of hexavalent chromium in dual-chamber microbial fuel cells separated by different ion exchange membranes, J. Hazard. Mater., 384 (2020) 121459, doi:10.1016/j.jhazmat.2019.121459.
  20. E. Jashni, S.M. Hosseini, Promoting the electrochemical and separation properties of heterogeneous cation exchange membrane by embedding 8-hydroxyquinoline ligand: chromium ions removal, Sep. Purif. Technol., 234 (2020) 116118, doi: 10.1016/j.seppur.2019.116118.
  21. X. Yaqiang, L. Ju, L. Jun, L. Minghong, F. Yawen, W. Hongtao, T. Song, L. Jun, Hypercrosslinked mesoporous poly(ionic liquid)s with high density of ion pairs: efficient adsorbents for Cr(VI) removal via ion-exchange, Chem. Eng. J., 378 (2019) 122107, doi: 10.1016/j.cej.2019.122107.
  22. S.W. Ahmad, M.S. Zafar, S. Ahmad, M. Zia-Ul-Haq, M. Ashraf, J. Rabbani, S. Ullah, Removal of chromium(VI) from wastewater through ion exchange, kinetic and scale up studies, Environ. Prot. Eng., 45 (2019) 17–29.
  23. B. Butter, P. Santander, G.D. Pizarro, D.P. Oyarzún, F. Tasca, J. Sánchez, Electrochemical reduction of Cr(VI) in the presence of sodium alginate and its application in water purification, J. Environ. Sci., 101 (2021) 304–312.
  24. X. Yang, L. Liu, M. Zhang, W. Tan, G. Qiu, L. Zheng, Improved removal capacity of magnetite for Cr(VI) by electrochemical reduction, J. Hazard. Mater., 374 (2019) 26–34.
  25. F. Yao, M. Jia, Q. Yang, K. Luo, F. Chen, Y. Zhong, L. He, Z. Pi, K. Hou, D. Wang, X. Li, Electrochemical Cr(VI) removal from aqueous media using titanium as anode: Simultaneous indirect electrochemical reduction of Cr(VI) and in-situ precipitation of Cr(III), Chemosphere, 260 (2020) 127537, doi:10.1016/j.chemosphere.2020.127537.
  26. K. Zhu, C. Chen, S. Lu, X. Zhang, A. Alsaedi, T. Hayat, MOFsinduced encapsulation of ultrafine Ni nanoparticles into 3D N-doped graphene-CNT frameworks as a recyclable catalyst for Cr(VI) reduction with formic acid, Carbon, 148 (2019) 52–63.
  27. F. Qianzhen, S. Ye, H. Yang, K. Yang, J. Zhou, Y. Gao, Q. Lin, X. Tan, Z. Yang, Application of layered double hydroxidebiochar composites in wastewater treatment: recent trends, modification strategies, and outlook, J. Hazard. Mater., 420 (2021) 126569, doi: 10.1016/j.jhazmat.2021.126569.
  28. D.A. Islam, K. Barman, S. Jasimuddin, H. Acharya, Synthesis of ultrasmall and monodisperse sulfur nanoparticles intercalated CoAl layered double hydroxide and their electrocatalytic water oxidation reaction at neutral pH, Nanoscale, 11 (2019) 7560–7566.
  29. W. Li, A. Liu, H. Tian, D. Wang, Controlled release of nitrate and molybdate intercalated in Zn-Al-layered double hydroxide nanocontainers towards marine anticorrosion applications, Colloid Interface Sci. Commun., 24 (2018) 18–24.
  30. B. Benalioua, M. Mansour, A. Bentouami, B. Boury, E.H. Elandaloussi, The layered double hydroxide route to Bi–Zn co-doped TiO2 with high photocatalytic activity under visible light, J. Hazard. Mater., 288 (2015) 158–167.
  31. L.D.S. Neto, C.G. Anchieta, J.L.S. Duarte, L. Meili, J.T. Freire, Effect of drying on the fabrication of MgAl layered double hydroxides, ACS Omega, 6 (2021) 21819–21829.
  32. L.P.F. Benício, V.R.L. Constantino, F.G. Pinto, L. Vergütz, J. Tronto, L.M. da Costa, Controlled release of phosphate from layered double hydroxide structures: dynamics in soil and application as smart fertilizer, ACS Sustainable Chem. Eng., 6 (2017) 5152–5161.
  33. S. Rafique, A.K. Kasi, J.K. Kasi, Aminullah, M. Bokhari, Z. Shakoor, Fabrication of silver-doped zinc oxide nanorods piezoelectric nanogenerator on cotton fabric to utilize and optimize the charging system, Nanomater. Nanotechnol., 10 (2020) 1–12.
  34. B.A. Baig, A. Elçi, A.N. Siyal, S. Dehrajd, Q.K. Panhwar, A. Ahmed, A.R. Bhattia, F. Ali, M.Y. Khuhawar, Facile synthesis and characterization of β-Cd(OH)2 nanostructures for adsorptive removal of Cr(VI) ions from wastewater: a statistical approach for multivariate sorption optimization, Desal. Water Treat., 218 (2021) 270–280.
  35. I.A. Bhatti, N. Ahmad, N. Iqbal, M. Zahid, M. Iqbal, Chromium adsorption using waste tire and conditions optimization by response surface methodology, J. Environ. Chem. Eng., 5 (2017) 2740–2751.
  36. S.H. Hasan, P. Srivastav, M. Talat, Biosorption of Pb(II) from water using biomass of Aeromonas hydrophila: central composite design for optimization of process variables, J. Hazard. Mater., 168 (2009) 1155–1162.
  37. D. Kundu, S.K. Mondal, T. Banerjee, Development of β-cyclodextrin-cellulose/hemicellulose-based hydrogels for the removal of Cd(II) and Ni(II): synthesis, kinetics, and adsorption aspects, J. Chem. Eng. Data, 64 (2019) 2601–2617.
  38. S.Q. Memon, S.M. Hasany, M.I. Bhanger, M.Y. Khuhawar, Enrichment of Pb(II) ions using phthalic acid functionalized XAD-16 resin as a sorbent, J. Colloid Interface Sci., 291 (2005) 84–91.
  39. O. Dvoynenko, S.L. Lo, Y.J. Chen, G.W. Chen, H.M. Tsai, Y.L. Wang, J.K. Wang, Speciation analysis of Cr(VI) and Cr(III) in water with surface-enhanced Raman Spectroscopy, ACS Omega, 6 (2021) 2052–2059
  40. Y. Lu, B. Jiang, L. Fang, F.L. Ling, J.M. Gao, F. Wu, X.H. Zhang, High performance NiFe layered double hydroxide for methyl orange dye and Cr(VI) adsorption, Chemosphere, 152 (2016) 415–422.
  41. S.X. Chen, Y.F. Huang, X.X. Han, Z.L. Wu, C. Lai, J. Wang, Q. Deng, Z.L. Zeng, S.G. Deng, Simultaneous and efficient removal of Cr(VI) and methyl orange on LDHs decorated porous carbons, Chem. Eng. J., 352 (2018) 306–315.
  42. W.W. Wang, J.B. Zhou, G. Achari, J.G. Yu, W.Q. Cai, Cr(VI) removal from aqueous solutions by hydrothermal synthetic layered double hydroxides: adsorption performance, coexisting anions and regeneration studies, Colloids Surf., A, 457 (2014) 33–40.
  43. M. Khitous, Z. Salem, D. Halliche, Effect of interlayer anions on chromium removal using Mg–Al layered double hydroxides: kinetic, equilibrium and thermodynamic studies, Chin. J. Chem. Eng., 24 (2016) 433–445.
  44. N. Jarrah, N.D. Mu’azu, M. Zubair, M. Al-Harthi, Enhanced adsorptive performance of Cr(VI) onto layered double hydroxide-bentonite composite: isotherm, kinetic and thermodynamic studies, Sep. Sci. Technol., 55 (2020) 897–1909.
  45. S. Zhao, Z. Li, H. Wang, H. Huang, C. Xia, D. Liang, J. Yang, Q. Zhang, Z. Meng, Effective removal and expedient recovery of As(V) and Cr(VI) from soil by layered double hydroxides coated waste textile, Sep. Purif. Technol., 263 (2021) 118419, doi: 10.1016/j.seppur.2021.118419.
  46. Y. Zhang, C. Jing, J. Zheng, H. Yu, Q. Chen, L. Guo, D. Pan, N. Naik, Q. Shao, Z. Guo, Microwave hydrothermal fabrication of CuFeCr ternary layered double hydroxides with excellent Cr(VI) adsorption, Colloids Surf., A, 628 (2021) 127279, doi: 10.1016/j.colsurfa.2021.127279.