Production and optimisation of adsorbent materials from teawaste for heavy metal removal from aqueous solution: feasibility of hexavalent chromium removal – kinetics, thermodynamics and isotherm study

Water Practice and Technology - Tập 17 Số 9 - Trang 1866-1880 - 2022
Chirangano Mangwandi1, Haili Chen2,1, Jiahong Wu1
1School of Chemistry and Chemical Engineering, Queen's University Belfast, David Kier Building, Belfast BT9 5AG, United Kingdom
2College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China

Tóm tắt

Abstract A face-centred central composite experimental design scheme was used to find experimental conditions this would result in producing magnetic bleached teawaste (MBTW) adsorbent material to have the optimum hexavalent chromium (Cr(VI)) removal capacity. The effect of treatment conditions, namely temperature (200 °C, 350 °C, 500 °C), duration of the heat treatment (2 h, 3 h, 4 h), the concentration of the iron chloride (0.02 g/g, 0.055 g/g, 0.09 g/g) added was investigated. The results obtained showed that the pyrolysis temperature and the amount of iron chloride added during treatment had significant effects on the performance of MBTW material in removal of both total chromium and Cr(VI). Increasing temperature from 200 °C to 500 °C, both Cr(VI) and total Cr removal would decrease. The material with optimum removal of Cr(VI) was used for the detailed adsorption study. The results from the detailed adsorption study indicated that the MBTW material has an excellent Langmuir removal capacity of Cr(VI) (269.9 mg/g). The Cr(VI) removal process also involved the reduction of the Cr(VI) to Cr(III). The removal process was shown to be temperature-dependent and endothermic. According to the FTIR analysis and the kinetic modelling results, chemisorption is the main mechanism responsible for the removal of the Cr(VI). The effect of background ions on the reduction of Cr(VI) was also investigated and the results show that presence of carbonate ions caused a huge reduction in removal of Cr(VI) while chloride ions had the least effect.

Từ khóa


Tài liệu tham khảo

10.1016/j.jenvman.2012.09.017

10.1016/j.jenvman.2017.08.042

10.1016/j.cherd.2013.10.015

10.1016/j.jhazmat.2009.02.136

10.1016/j.ecoenv.2017.11.034

Chen, 2022, Enhancing the Chromium Removal Capacity of Banana Peel Wastes by Acid Treatment, In, Springer International Publishing, Cham, pp., 317-20

Chen, 2019, Upcycling food waste digestate for energy and heavy metal remediation applications, Resources, Conservation & Recycling: X 3, 100015

10.2136/sssaj1980.03615995004400020013x

10.1016/j.molliq.2015.12.057

10.1039/C6RA27781K

10.1016/j.watres.2005.08.015

10.1016/j.seppur.2004.10.008

10.1016/j.atmosenv.2014.11.011

10.1016/j.cej.2006.02.014

10.1016/j.jwpe.2015.02.004

10.1002/ep.670200115

10.1016/j.cherd.2020.09.020

10.4137/ASWR.S35227

Jiahong, 2021, Upcycling teawaste into magnetic adsorbents materials for removal of Cr(VI) from aqueous solutions

10.1016/j.electacta.2016.01.130

10.1016/j.jhazmat.2016.09.029

10.1016/j.powtec.2013.10.039

10.1016/j.cherd.2020.01.034

10.1016/j.cej.2012.12.054

10.1016/j.desal.2004.03.022

Mohit, 2019, Adsorption of Cr (VI) ion from tannery wastewater on tea waste: kinetics, equilibrium and thermodynamics studies, Journal of Environmental Chemical Engineering, 7

10.1016/j.fluid.2016.10.003

10.1016/j.jhazmat.2007.11.001

10.1007/s11270-008-9893-7

10.1039/c2em10949b

Rathour, 2020, Selective and multicycle removal of Cr(VI) by graphene oxide -EDTA composite: Insight into the removal mechanism and ionic interference in binary and ternary associations, Environmental Technology & Innovation 19, 100851

Salem, 2000, Heavy metals in drinking water and their environmental impact on human health, In: International Conference on the Environmental Hazards Mitigation, Cairo University, Giza, Egypt, pp., 542-56

10.1080/01496395.2018.1495735

10.1016/j.jenvman.2011.10.020

10.1007/978-3-7643-8340-4_6

Thapak, 2015, Tea Waste Adsorbent for the Removal of Chromium and Copper from Synthetic Wastewater, International Journal for Innovative Research in Science & Technology, 2.2, 70

10.1016/j.jhazmat.2016.01.081

10.1021/acssuschemeng.7b00418

Wu, 2016, Functionalized agricultural biomass as a low-cost adsorbent: utilization of rice straw incorporated with amine groups for the adsorption of Cr(VI) and Ni(II) from single and binary systems, Biochemical Engineering Journal 105(Part A), 27-35

10.1002/adma.201103789

10.1021/acs.iecr.5b00995

10.1039/C4RA08432B

10.1016/j.biortech.2006.12.021

Thông tin
Thông tin xuất bản

Water Practice and Technology

Tập 17 Số 9

1866-1880

Thông tin tác giả