Biomass bagasse-based hyperbranched adsorbent for the complete removal of low-level Cr(VI)
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ORIGINAL RESEARCH
Biomass bagasse-based hyperbranched adsorbent for the complete removal of low-level Cr(VI) Hui He . Qin Lu . Huanhuan Huang . Fei Xue . Wenju Lin . Hang Zhou . Wei Wei
Received: 17 December 2019 / Accepted: 22 June 2020 Ó Springer Nature B.V. 2020
Abstract A biomass bagasse-based hyperbranched adsorbent (BF/HBPA) with high amino density was synthesized using epichlorohydrin (ECH) to cross-link hyperbranched polyamine (HBP-NH2) with bagasse fibre powder (BF). Using this kind of ‘‘cross-linking’’ procedure to synthesize the bagasse-based hyperbranched adsorbent could overcome the disadvantages of the low amino density in the stepwise grafting process, avoiding the requirement of strict preparation conditions and a complicated synthesis process. Thus, the as-prepared BF/HBPA could completely remove low-level Cr(VI) (1.6 mg/L), and showed an outstanding adsorption capacity (330.7 mg/g) for Cr(VI) at high Cr(VI) concentrations (108.3 mg/L) under 30 °C and pH value of 2. BF, as the framework of BF/HBPA Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03308-1) contains supplementary material, which is available to authorized users. H. He Q. Lu H. Huang F. Xue H. Zhou W. Wei (&) School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, P.R. China e-mail: [email protected] H. He Q. Lu H. Huang F. Xue H. Zhou W. Wei Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, P.R. China W. Lin Guangxi Guangye Sugar Industry Group Co., Ltd, Guigang 537102, P.R. China
cross-linking network, enhanced the adsorption rate (arrived at adsorption equilibrium in 15 min) for Cr(VI) on BF/HBPA. Moreover, BF/HBPA showed a promising regeneration property. After reusing for 10 cycles, the removal rate of BF/HBPA was maintained above 96%. The adsorption mechanism of physical electrostatic adsorption, chemical chelating adsorption and oxidation-reduction were all attributed to the complete removal of low-level Cr(VI) to the Safe Drinking Level (US EPA) (0.05 mg/L). Keywords Bagasse Hyperbranched Crosslinking Cr(VI) Complete removal
Introduction Cr(VI) exerts high carcinogenicity, toxicity and mutagenicity to animals and humans (Almeida et al. 2019; Devoy et al. 2019; Luo et al. 2017; Mangalam et al. 2019). Long-term exposure to Cr(VI) can lead to skin ulceration, nose perforation, lung cancer (Liu et al. 2019b; Adekunle et al. 2020). Nevertheless, compared with Cr(VI), the mobility and toxicity of Cr(III) are reduced by 500–1000 fold, and the enrichment of Cr(VI) is thought to be more than 100 times as hazardous as Cr(III) (Jie Ding et al. 2018; Chen and Kuo 2017). So, the reduction of hightoxicity Cr(VI) to the relatively safe Cr(III) is of great significance for the environment (Xin et al. 2018; Han
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et al. 2017). In recent studies, many methods have been devised to remove Cr(VI), including redox reactions (Chen et
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