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. 2020 Jan 27;17(3):788. doi: 10.3390/ijerph17030788

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Comparison of adsorption capacity among chitosan, chitosan-kenaf biochar, chitosan-BiFeO₃, CKB and kenaf biochar: C_0Cr(VI) = 50mg/L, W = 0.2 g, T = 30 °C, t = 4 h, pH = 2, (b) Effect of solution pH on Cr(VI) adsorption onto CKB: C_0Cr(VI) = 50 mg/L, W = 0.2 g, T = 30 °C, t = 4 h, (c) Effect of Ca²⁺, NO₃⁻, PO₄³⁻, and SO₄²⁻ on Cr(VI) adsorption onto CKB: C_0Cr(VI) = 50 mg/L, W = 0.2 g, T = 30 °C, t = 4 h, pH = 2.