[1] R. Yu, Y. Shi, D. Yang, Y. Liu, J. Qu, Z. Yu, Graphene oxide/chitosan aerogel microspheres with honeycomb-cobweb and radially oriented microchannel structures for broad-spectrum and rapid adsorption of water contaminants, ACS Appl. Mater. Interfaces 9(2017) 21809-21819. [2] V. Gopalakannan, N. Viswanathan, Development of nano-hydroxyapatite embedded gelatin biocomposite for effective Cr(VI) removal, Ind. Eng. Chem. Res. 54(2015) 12561-12569. [3] J. Wu, H. Zhang, P. He, Q. Yao, L. Shao, Cr(VI) removal from aqueous solution by dried activated sludge biomass, J. Hazard. Mater. 176(2010) 697-703. [4] D. Park, Y. Yun, D. Lee, J. Park, Optimum condition for the removal of Cr(VI) or total Cr using dried leaves of Pinus densiflora, Desalination. 271(2011) (2011) 309-314. [5] F. Fu, W. Han, Z. Cheng, T. Bing, Removal of hexavalent chromium from wastewater by acid-washed zero-valent aluminum, Desalin. Water Treat. 57(2016) 5592-5600. [6] H. Altundogan, Cr(VI) removal from aqueous solution by iron (III) hydroxide-loaded sugar beet pulp, Process Biochem. 40(2004) 1443-1452. [7] M. Yue, M. Zhang, B. Liu, X. Xu, X. Li, Q. Yue, Characteristics of amine surfactant modified peanut shell and its sorption property for Cr(VI), Chin. J. Chem. Eng. 21(2013) 1260-1268. [8] M. Singh, Heavy metal pollution in freshly deposited sediments of the Yamuna River (the Ganges River tributary):A case study from Delhi and Agra urban centres, India, Environ. Geol. 40(2001) 664-671. [9] C. Namasivayam, M. Sureshkumar, Removal of chromium(VI) from water and wastewater using surfactant modified coconut coir pith as a biosorbent, Bioresour. Technol. 99(2008) 2218-2225. [10] B. Xie, S. Chao, X. Zhe, X. Li, X. Zhang, J. Chen, B. Pan, One-step removal of Cr(VI) at alkaline pH by UV/sulfiteprocess:Reduction to Cr(III) and in situ Cr(III) precipitation, Chem. Eng. J. 308(2017) 791-797. [11] Y. Yao, Q. Wei, M. Sun, Y. Chen, X. Ren, Environmentally friendly chromium electrodeposition:Effect of pre-electrolysis on a Cr(III) bath in an anion-exchange membrane reactor, RSC Adv. 3(2013) 13131-13136. [12] S. Das, P. Chakraborty, R. Ghosh, S. Paul, S. Mondal, A. Panja, A. Nandi, Folic acidpolyaniline hybrid hydrogel for adsorption/reduction of chromium(VI) and selective adsorption of anionic dye from water, ACS Sustainable Chem. Eng. 5(2017) 9325-9337. [13] L. Melita, M. Popescu, Removal of Cr (VI) from industrial water effluents and surface waters using activated composite membranes, J. Membr. Sci. 312(2008) 157-162. [14] A. Yavuz, E. Dincturk-Atalay, A. Uygun, F. Gode, E. Aslan, A comparison study of adsorption of Cr(VI) from aqueous solutions onto alkyl-substituted polyaniline/chitosan composites, Desalination. 279(2011) 325-331. [15] L. Yan, J. Wang, H. Yu, Q. Wei, B. Du, X. Shan, Adsorption of benzoic acid by CTAB exchanged montmorillonite, Appl. Clay Sci. 37(2007) 226-230. [16] Y. Xie, D. Shao, X. Lu, T. Hayat, N. Alharbi, C. Chen, G. Song, D. Chen, Y. Sun, Spectroscopic investigation of enhanced adsorption of U(VI) and Eu(III) on magnetic attapulgite in binary system, Ind. Eng. Chem. Res. 57(2018) 7533-7543. [17] K. Bhattacharyya, S. Gupta, Adsorption of chromium(VI) from water by clays, Ind. Eng. Chem. Res. 45(2006) 7232-7240. [18] Y. Ling, J. Zhang, Chelate regulatory ζ-potentials of montmorillonite and its adsorption capacity for Cr(III), Chem. J. Chin. Univ. 30(2009) 2478-2483. [19] Y. Wang, Y. Feng, X. Zhang, X. Zhang, J. Jiang, J. Yao, Alginate-based attapulgite foams as efficient and recyclable adsorbents for the removal of heavy metals, J. Colloid Interf. Sci. 514(2017) 190-198. [20] F. Ying, D. Chen, A novel catalyst of Fe-octacarboxylic acid phthalocyanine supported by attapulgite for degradation of Rhodamine B, Mater. Res. Bull. 45(2010) 1728-1731. [21] J. Huang, X. Wang, Q. Jin, Y. Li, Y. Wang, Removal of phenol from aqueous solution by adsorption onto OTMAC-modified attapulgite, J. Environ. Manag. 84(2007) 229-236. [22] L. Peng, L. Jiang, L. Zhu, A. Wang, Attapulgite/poly(acrylic acid) nanocomposite (ATP/PAA) hydrogels with multifunctionalized attapulgite (org-ATP) nanorods as unique cross-linker:Preparation optimization and selective adsorption of Pb(II) ion, ACS Sustainable Chem. Eng. 2(2014) 269-271. [23] B. Yuan, X. Yin, X. Liu, X. Li, L. Sun, Enhanced hydrothermal stability and catalytic performance of hkust-1 by incorporating carboxyl-functionalized attapulgite, ACS Appl. Mater. Interfaces 8(2016) (2016) 16457-16464. [24] X. Li, Y. Jiang, X. Liu, L. Shi, D. Zhang, L. Sun, Direct synthesis of zeolites from a natural clay, attapulgite, ACS Sustainable Chem. Eng. 5(2017) 6124-6130. [25] H. Chen, Y. Zhao, A. Wang, Removal of cu(II) from aqueous solution by adsorption onto acid-activated palygorskite, J. Hazard. Mater. 149(2007) 346-354. [26] J. Zhang, Q. Wang, A. Wang, Synthesis and characterization of chitosan-g-poly (acrylic acid)/attapulgite superabsorbent composites, Carbohydr. Polym. 68(2007) 367-374. [27] L. Chen, H. Liang, Y. Lu, C. Cui, S. Yu, Synthesis of an attapulgite clay@carbon nanocomposite adsorbent by a hydrothermal carbonization process and their application in the removal of toxic metal ions from water, Langmiur. 27(2011) 8998-9004. [28] B. Li, W. Li, Q. Zhang, W. Weng, H. Wan, Attapulgite as natural catalyst for glucose isomerization to fructose in water, Catal. Commun. 99(2017) 20-24. [29] K. Doke, E. Khan, Equilibrium, kinetic and diffusion mechanism of Cr(VI) adsorption onto activated carbon derived from wood apple shell, Arab. J. Chem. 10(2017) S252-S260. [30] Y. Chen, H. Xu, S. Wang, L. Kang, Removal of Cr(VI) from water using polypyrrole/attapulgite core-shell nanocomposites:Equilibrium, thermodynamics and kinetics, RSC Adv. 4(2014) 17805-17811. [31] H. Lu, H. Lu, Y. Chen, ZVI/PANI/ATP composite by static polymerization as adsorbent for removal of Cr(VI), RSC Adv. 4(2014) 5873-5879. [32] Z. Yang, B. Wang, L. Chai, Removal of Cr(III) and Cr(VI) from aqueous solution by adsorption on sugarcane pulp residue, J. Cent. S. Univ. Technol. 16(2009) 101-107. [33] X. Zhang, L. Lv, Y. Qin, M. Xu, X. Jia, Z. Chen, Removal of aqueous Cr(VI) by a magnetic biochar derived from Melia azedarach wood, Bioresour. Technol. 256(2018) 1-10. [34] W. Zhu, Q. Dang, C. Liu, D. Yu, G. Chang, X. Pu, Q. Wang, Cr(VI) and Pb(II) capture on pH-responsive polyethyleneimine and chloroacetic acid functionalized chitosan microspheres, Carbohydr. Polym. 219(2019) 353-367. [35] X. Feng, C. Liang, J. Yu, X. Jiang, Facile fabrication of graphene oxidepolyethylenimine composite and its application for the Cr(VI) removal, Sep. Sci. Technol. 53(2018) 2376-2387. [36] B. Qiu, J. Guo, X. Zhang, D. Sun, H. GU, Q. Wang, H. Wang, X. Wang, X. Zhang, B. Weeks, Z. Guo, S. Wei, Polyethylenimine facilitated ethyl cellulose for hexavalent chromium removal with a wide pH range, ACS Appl. Mater. Interfaces 6(2014) 19816-19824. [37] S. Deng, Y. Ting, Polyethylenimine-modified fungal biomass as a high-capacity biosorbent for Cr(VI) anions:Sorption capacity and uptake mechanisms, Environ. Sci. Technol. 39(2005) 8490-8496. [38] Y. Xing, X. Chen, D. Wang, Electrically regenerated ion exchange for removal and recovery of Cr(VI) from wastewater, Environ. Sci. Technol. 41(2007) 1439-1443. [39] Y. Ho, Removal of copper ions from aqueous solution by tree fern, Water Res. 37(2013) 2323-2330. [40] C. Li, T. Zhou, H. Jin, Y. Lian, W. Han, Effective adsorption/reduction of Cr(VI) oxyanion by halloysite@polyaniline hybrid nanotubes, ACS Appl. Mater. Interfaces 9(2017) 6030-6043. [41] D. Zhao, H. Zhu, C. Wu, S. Feng, A. Alsaedi, T. Hayat, Facile synthesis of magnetic Fe3O4/graphene composites for enhanced U(VI) sorption, Appl. Surf. Sci. 444(2018) 691-698. |