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对1.0~1.6mm的新疆核桃壳进行改性,在其表面引入氨基基团,以此作为吸附剂,研究其对含Cr(VI)模拟废水的静态吸附性能。实验结果表明,改性核桃壳对Cr(VI)有很好的吸附作用,对于50m L浓度为20mg/L模拟水样,当温度为25℃,水样初始p H值为5.89,吸附剂用量为0.50g,吸附时间为180min时,Cr(VI)的去除率可以达到98.6%,并且随着体系温度的升高,改性核桃壳对Cr(VI)的吸附量逐渐增加。吸附等温线拟合结果表明,Langmuir吸附等温模型能更好地描述上述吸附过程。
The walnut shell with 1.0 ~ 1.6mm in Xinjiang was modified to introduce amino group into the surface of the walnut shell, which could be used as adsorbent to study its static adsorption performance on simulated wastewater containing Cr (VI). The experimental results showed that the modified walnut shell had a good adsorption effect on Cr (VI). For 50 mg L of simulated water sample at 20 mg / L, the initial p H value of water sample was 5.89 when the temperature was 25 ℃, Was 0.50g, adsorption time was 180min, Cr (VI) removal rate can reach 98.6%, and with the increase of system temperature, the modified walnut shell adsorption of Cr (VI) gradually increased. The fitting results of adsorption isotherms show that the Langmuir adsorption isothermal model can better describe the adsorption process.