Facial Synthesis of Adsorbent from Hemicelluloses for Cr(VI) Adsorption

• Published in: Molecules (Basel, Switzerland) Vol. 26; no. 5; p. 1443
• Main Authors: Wei, Yi, Chen, Wei, Liu, Chuanfu, Wang, Huihui
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 07.03.2021; MDPI
• Subjects: Adsorbents; Adsorption; adsorption kinetics; Ammonia; Aqueous solutions; Carbon; Carbon - chemistry; Chromium; Chromium - chemistry; Chromium - isolation & purification; Citric Acid - chemistry; Ethanol; Experiments; Fourier transforms; heavy metal; hemicelluloses; Hydrogen-Ion Concentration; hydrothermal carbonization; Industrial wastes; Kinetics; Metabolism; Microscopy, Electron, Scanning; Morphology; Photoelectron Spectroscopy; Polysaccharides - chemistry; Potassium; Scanning electron microscopy; Spectroscopy, Fourier Transform Infrared; Spectrum analysis; Spectrum Analysis, Raman; Vibration; Wastewater treatment; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; X-Ray Diffraction; United States > US; China; Germany; heavy metal; hydrothermal carbonization; hemicelluloses; adsorption kinetics
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules26051443

It is challenging work to develop a low-cost, efficient, and environmentally friendly Cr(VI) adsorbent for waste water treatment. In this paper, we used hemicelluloses from chemical fiber factory waste as the raw material, and prepared two kinds of carbon materials by the green hydrothermal method as adsorbent for Cr(VI). The results showed that hemicelluloses hydrothermally treated with citric acid (HTC) presented spherical shapes, and hemicelluloses hydrothermally treated with ammonia solution (HTC-NH2) provided spongy structures. The adsorption capacity of the samples can be obtained by the Langmuir model, and the adsorption kinetics could be described by the pseudo-second-order model at pH 1.0. The maximum adsorption capacity of HTC-NH2 in the Langmuir model is 74.60 mg/g, much higher than that of HTC (61.25 mg/g). The green hydrothermal treatment of biomass with ammonia solution will provide a simple and feasible way to prepare adsorbent for Cr(VI) in waste water treatment.