Abstract
A novel bio-adsorbent was fabricated via grafting an amino-terminated hyperbranched polymer (HBP-NH2) onto bagasse cellulose. The morphology and microstructure of the HBP-NH2-grafted bagasse cellulose (HBP-g-BC) were characterized and its adsorption capacity for Cr(VI) ions in aqueous solutions was investigated. The rough surface structure of HBP-g-BC that is beneficial for improving the adsorption capacity was observed by scanning electron microscopy (SEM). The grafting reaction was confirmed by Fourier-transform infrared (FT-IR) spectroscopy. The adsorbent performance was shown to be better with a lower pH value, a higher adsorbent dosage, or a higher initial Cr(VI) concentration. Moreover, the kinetics study revealed that the adsorption behavior followed a pseudo-second-order model. The isotherm results showed that the adsorption data could be well-fitted by the Langmuir, Freundlich, or Temkin models. Moreover, HBP-g-BC could maintain 74.4% of the initial removal rate even after five cycles of regeneration. Thus, the high potential of HBP-g-BC as a bio-adsorbent for heavy metal removal has been demonstrated.
Highlights
Chromium is one of the most common heavy metals used in industry and has a broad range of industrial applications, such as electroplating and metal processing
Compared with that of bagasse cellulose (BC), the spectrum of Dialdehyde Bagasse Cellulose (DABC) shows a characteristic adsorption peak of carbonyl group at 1726 cm−1, suggesting that aldehyde groups were introduced to BC to form
We have demonstrated that the Hyperbranched polymers (HBPs)-g-BC bio-adsorbent is capable of removing Cr(VI) ions from aqueous solutions, and its maximum adsorption capacity for Cr(VI) was much higher than that of DABC
Summary
Chromium is one of the most common heavy metals used in industry and has a broad range of industrial applications, such as electroplating and metal processing. Wastewater containing Cr(VI) may cause serious environmental problems [1,2]. Contact with Cr(VI) can cause ulcerations and dermatitis on the skin. It has been reported that ingestion of Cr(VI) through contaminated drinking water could potentially cause mouth or stomach cancers [4]. The removal of Cr(VI) from wastewater is essential to protect the environment and maintain human health
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