Abstract
Hydrothermal carbon (HTC) was prepared by the one-step hydrothermal method for Cr (VI) removal from wastewater, which was considered a “green chemistry” method. The specific surface area (SBET) of HTC was 85 m2/g with the pore size in range of 2.0–24.0 nm. FT-IR spectra analysis showed that the HTC had abundant chemical surface functional groups. The influence of adsorption parameters such as pH, HTC dosage, Cr (VI) concentration, and contact time on the removal efficiency of Cr (VI) had been investigated. When the initial concentration was 50 mg/L, pH = 6, amount of adsorbent was 0.2 g/50 ml, and adsorption time was 90 min; the Cr (VI) absorbed rate of HTC reached 98%. Batch adsorption experiments indicated that Cr (VI) adsorption data of HTC fitted the Freundlich isothermal and pseudo-second-order kinetic models. Overall, our findings provide a promising material in treatment of Cr (VI)-rich wastewater and give a clear picture of its application, which is worthy of further study.
Highlights
Heavy metal contamination in water is becoming a concerning global environmental issue
Activated carbons have better adsorption capacity and Cr (VI) absorbed rate resulted from the large surface area and volume, which have been widely employed to eliminate Cr (VI) ions from wastewater resulted from its low cost, high adsorption efficiency, and simple operation [18, 19]
Hydrothermal carbonization (HTC) processes as a nascent technology to produce functional materials was reported resulting from its low cost, simplicity in operation, and high energy efficiency [24, 25]
Summary
Heavy metal contamination in water is becoming a concerning global environmental issue Heavy metal pollutants, such as chromium, arsenic, cadmium, nickel, copper, and lead, are difficult to be removed or degraded from the water mostly due to their high stability [1]. Activated carbons have better adsorption capacity and Cr (VI) absorbed rate resulted from the large surface area and volume, which have been widely employed to eliminate Cr (VI) ions from wastewater resulted from its low cost, high adsorption efficiency, and simple operation [18, 19]. Hydrothermal carbonization (HTC) processes as a nascent technology to produce functional materials was reported resulting from its low cost, simplicity in operation, and high energy efficiency [24, 25]. The adsorption kinetics and isotherms of Cr (VI) on HTC at different temperatures were analyzed and discussed
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