科研之友
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摘要
Cr (VI) is one of the toxic heavy metals and how to effectively reduce the excessive amounts of Cr (VI) in wastewater to safe concentration has received increasing attention. In this study, magnetic chitosan/PVA hydrogel beads (MCPHB) were prepared and used for Cr (VI) removal. The effects of initial pH value, absorbent dose, contact time, temperature, and the initial concentration of Cr (VI) solution were investigated. The results indicated that the maximum adsorption quantity was 2.21 mg g(-1), and the optimum pH appeared at pH=3. The kinetics of adsorption is better fitted by the pseudo-second order equation, and adsorption isotherms are better described by the Langmuir equation. The residual concentration of Cr (VI) in the solution can meet the National Standard of drinking water. The results indicated that MCPHB can be used as promising adsorbents for the removal of Cr (VI) from low concentration wastewater.
