Adsorption of 2, 4-dichlorophenol on paper sludge/wheat husk biochar: Process optimization and comparison with biochars prepared from wood chips, sewage sludge and hog fuel/demolition waste. Issue 3 (June 2017)

• Record Type: Journal Article
• Authors: Kalderis, Dimitrios; Kayan, Berkant; Akay, Sema; Kulaksız, Esra; Gözmen, Belgin
• Is Part Of: Journal of environmental chemical engineering. Volume 5:Issue 3(2017:Sep.)
• Page Start: 2222
• Page End: 2231
• Publication Date: 2017-06
• Subjects: 2, 4-dichlorophenol -- Chlorophenols -- Biochar -- Adsorption -- Biomass pyrolysis; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2017.04.039
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The adsorption of 2, 4-dichlorophenol, a toxic by-product of triclosan commonly found in wastewater treatment plant effluents, was studied on paper sludge/wheat husks biochar. By using response surface methodology, the optimum conditions and effects of pH, temperature, initial 2, 4-DCP concentration and time were determined. The solution pH was found to be the most influential parameter whereas the optimum adsorption conditions were predicted as: C0 = 40.28 mg L −1, T = 326 K, pH = 2.8, t = 143 min, where a 99.95% adsorption could be achieved. Both Langmuir and Freundlich provided a good fit for the experimental data, indicating a surface and multi-layer adsorption. Kinetically, the process primarily followed the pseudo-second order model (chemisorption). By comparing the adsorption capacity at equilibrium of our main biochar (qe = 9.28 mg g −1 ) to 3 biochars prepared from different biomasses (qe values 1.57–2.96 mg g −1 ), it was concluded that pH-dependent electrostatic interactions and non-covalent π-electron donor-acceptor mechanisms play the most important role. Finally, there was indication that high concentrations of Ca and K may promote the adsorbate-adsorbent interactions and enhance adsorption.