The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles.

Autor:	Van HT; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 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., Dang NV; Faculty of Physics and Technology, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City Vietnam dangnv@tnus.edu.vn., Chao HP; Department of Environmental Engineering, Chung Yuan Christian University Taoyuan 32023 Taiwan., Nguyen QT; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam tapvh@tnus.edu.vn., Nguyen TH; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam tapvh@tnus.edu.vn., Nguyen TBL; Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS) Tan Thinh Ward Thai Nguyen City 24000 Vietnam tapvh@tnus.edu.vn., Thanh DV; TNU - University of Medicine and Pharmacy Thai Nguyen Vietnam., Nguyen HD; Faculty of Environment, Thai Nguyen University of Agriculture and Forestry (TUAF) Thai Nguyen City 24000 Vietnam., Thang PQ; Institute of Environmental Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Road Ha Noi City Vietnam., Thanh PTH; Faculty of Chemistry, TNU - University of Education No. 20, Luong Ngoc Quyen Road Thai Nguyen City Vietnam., Hoang VP; School of Chemistry, Biology and Environment, Vinh University No. 182 Le Duan Vinh City Nghe An Province Vietnam.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2021 Feb 02; Vol. 11 (10), pp. 5801-5814. Date of Electronic Publication: 2021 Feb 02 (Print Publication: 2021).
DOI:	10.1039/d0ra09974k
Abstrakt:	In this study, two types of agricultural wastes, sugarcane bagasse (SB) and cassava root husks (CRHs), were used to fabricate biochars. The pristine biochars derived from SB and CRHs (SBB and CRHB, respectively) were modified using ZnO nanoparticles to generate modified biochars (SBB-ZnO and CRHB-ZnO, respectively) for the removal of Reactive Red 24 (RR24) from stimulated wastewater. Batch experiments were performed to evaluate the effects of ZnO nanoparticles' loading ratio, solution pH, contact time, and initial RR24 concentration on the RR24 adsorption capacity of biochars. The RR24 adsorption isotherm and kinetic data on SBB, SBB-ZnO3, CRHB, and CRHB-ZnO3 were analyzed. Results indicate that SB- and CRH-derived biochars with a ZnO nanoparticle loading ratio of 3 wt% could generate maximum adsorption capacities of RR24 thanks to the double growth on the BET surface of modified biochars. The RR24 adsorption capacities of CRHB-ZnO3 and SBB-ZnO3 reached 81.04 and 105.24 mg g -1 , respectively, which were much higher than those of pristine CRHB and SBB (66.19 and 76.14, respectively) at an initial RR24 concentration of 250 mg L -1 , pH 3, and contact time of 60 min. The adsorption of RR24 onto biochars agreed well with the pseudo-first-order model and the Langmuir isotherm. The RR24 adsorption capacity on modified biochars, which were reused after five adsorption-desorption cycles showed no insignificant drop. The main adsorption mechanisms of RR24 onto biochars were controlled by electrostatic interactions between biochars' surface positively charged functional groups with azo dye anions, pore filling, hydrogen bonding formation, and π-π interaction. Competing Interests: The authors declare that they have no conflict of interest. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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