Applicability of TiO2(B) nanosheets@hydrochar composites for adsorption of tetracycline (TC) from contaminated water

Mengting Z 1 , Kurniawan TA 2 , Avtar R 3 , Othman MHD 4 , Ouyang T 1 , Yujia H 1 Show all authors , Xueting Z 1 , Setiadi T 5 , Iswanto I 6

Affiliations 

  • 1 Key Laboratory of the Coastal and Wetland Ecosystems (Xiamen University), Ministry of Education, College of the Environment and Ecology, Xiamen University, Fujian 361102, China
  • 2 Key Laboratory of the Coastal and Wetland Ecosystems (Xiamen University), Ministry of Education, College of the Environment and Ecology, Xiamen University, Fujian 361102, China; Department of Energy, Environment, and Climate Change, School of Environment Resources and Development (SERD), Asian Institute of Technology (AIT), Pathumthani 12120, Thailand. Electronic address: tonni@xmu.edu.cn
  • 3 Faculty of Environmental Earth Sciences, Hokkaido University, Sapporo 060-0810, Japan. Electronic address: ram@ees.hokudai.jp
  • 4 Advanced Membrane Technology Research Centre (AMTEC), School of Chemical and Energy Engineering, University Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
  • 5 Center for Environment Studies, Bandung Institute of Technology (ITB), Bandung 40135, Indonesia
  • 6 Poltekkes, Kemenkes, Yogyakarta 55293, Indonesia
J Hazard Mater, 2021 03 05;405:123999.
PMID: 33288338 DOI: 10.1016/j.jhazmat.2020.123999

Abstract

We test the feasibility of TiO2(B)@carbon composites as adsorbents, derived from wheat straws, for tetracycline (TC) adsorption from aqueous solutions. Hydrochar (HC), biochar (BC), and hydrochar-derived pyrolysis char (HDPC) are synthesized hydrothermally from the waste and then functionalized with TiO2(B), named as 'Composite-1', 'Composite-2', and 'Composite-3', respectively. A higher loading of TiO2(B) into the HC was also synthesized for comparison, named as 'Composite-4'. To compare their physico-chemical changes before and after surface modification, the composites are characterized using FESEM-EDS, XRD, BET, FRTEM, and FTIR. The effects of H2O2 addition on TC removal are investigated. Adsorption kinetics and isotherms of TC removal are studied, while TC adsorption mechanisms are elaborated. We found that the Composite-4 has the highest TC removal (93%) at pH 7, 1 g/L of dose, and 4 h of reaction time at 50 mg/L of TC after adding H2O2 (10 mM). The TC adsorption capacities of the Composite-1 and Composite-4 are 40.65 and 49.26 mg/g, respectively. The TC removal by the Composite-1 follows the pseudo-second order. Overall, this suggests that converting the wheat straw into HC and then functionalizing its surface with TiO2(B) as a composite has added values to the waste as an adsorbent for wastewater treatment.

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