Enhanced simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi) ions from aqueous solution using cassava root husk-derived biochar loaded with ZnO nanoparticles.

Autor:	Tho PT; Laboratory of Magnetism and Magnetic Materials, Advanced Institute of Materials Science, Ton Duc Thang University Ho Chi Minh City Vietnam phamtruongtho@tdtu.edu.vn.; Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam., Van HT; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam tapvh@tnus.edu.vn., Nguyen LH; Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI) Ho Chi Minh City Vietnam., Hoang TK; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam tapvh@tnus.edu.vn., Ha Tran TN; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam tapvh@tnus.edu.vn., Nguyen TT; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam tapvh@tnus.edu.vn., Hanh Nguyen TB; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam tapvh@tnus.edu.vn., Nguyen VQ; The Center for Technology Incubator and Startup Support, Thai Nguyen University of Agriculture and Forestry Quyet Thang Ward Thai Nguyen City Vietnam., Le Sy H; Advanced Educational Program, Thai Nguyen University of Agriculture and Forestry Quyet Thang Ward Thai Nguyen City Vietnam., Thai VN; HUTECH Institute of Applied Sciences, Ho Chi Minh City University of Technology (HUTECH) 475A Dien Bien Phu, Ward 25, Binh Thanh Dist Ho Chi Minh City Vietnam., Tran QB; Institute of Research and Development, Duy Tan University Da Nang 550000 Vietnam tranbaquoc@duytan.edu.vn.; Faculty of Environmental and Chemical Engineering, Duy Tan University Da Nang 550000 Vietnam., Sadeghzadeh SM; New Materials Technology and Processing Research Center, Department of Chemistry, Neyshabur Branch, Islamic Azad University Neyshabur Iran., Asadpour R; Geosciences & Petroleum Engineering Department, Universiti Teknologi PETRONAS 32610 Bandar Seri Iskandar Perak Darul Ridzuan Malaysia., Thang PQ; Institute of Environmental Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Ha Noi City Vietnam.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2021 May 25; Vol. 11 (31), pp. 18881-18897. Date of Electronic Publication: 2021 May 25 (Print Publication: 2021).
DOI:	10.1039/d1ra01599k
Abstrakt:	This study presents the modification of cassava root husk-derived biochar (CRHB) with ZnO nanoparticles (ZnO-NPs) for the simultaneous adsorption of As(iii), Cd(ii), Pb(ii) and Cr(vi). By conducting batch-mode experiments, it was concluded that 3% w/w was the best impregnation ratio for the modification of CRHB using ZnO-NPs, and was denoted as CRHB-ZnO3 in this study. The optimal conditions for heavy metal adsorption were obtained at a pH of 6-7, contact time of 60 min, and initial metal concentration of 80 mg L -1 . The heavy metal adsorption capacities onto CRHB-ZnO3 showed the following tendency: Pb(ii) > Cd(ii) > As(iii) > Cr(vi). The total optimal adsorption capacity achieved in the adsorption of the 4 abovementioned metals reached 115.11 and 154.21 mg g -1 for CRHB and CRHB-ZnO3, respectively. For each Pb(ii), Cd(ii), As(iii), and Cr(vi) metal, the maximum adsorption capacities of CRHB-ZnO3 were 44.27, 42.05, 39.52, and 28.37 mg g -1 , respectively, and those of CRHB were 34.47, 32.33, 26.42 and 21.89 mg g -1 , respectively. In terms of kinetics, both the pseudo-first-order and the pseudo-second-order fit well with metal adsorption onto biochars with a high correlation coefficient of R 2 , while the best isothermal description followed the Langmuir model. As a result, the adsorption process of heavy metals onto biochars was chemisorption on homogeneous monolayers, which was mainly controlled by cation exchange and surface precipitation mechanisms due to enriched oxygen-containing surface groups with ZnO-NP modification of biochar. The FTIR and EDS analysis data confirmed the important role of oxygen-containing surface groups, which significantly contributed to removal of heavy metals with extremely high adsorption capacities, comparable with other studies. In conclusion, due to very high adsorption capacities for metal cations, the cassava root husk-derived biochar modified with ZnO-NPs can be applied as the alternative, inexpensive, non-toxic and highly effective adsorbent in the removal of various toxic cations. Competing Interests: The authors declare that they have no conflict of interest. (This journal is © The Royal Society of Chemistry.)
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