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本文研究了用瓷土作廉价的吸附剂除去水溶液中Cr~(+6)的方法。在pH2.5和温度30℃的条件下,浓度为0.5×10~(-4)的Cr~(+6)溶液的最大除去率为68％。用Lagergren方程解释了吸附过程的动力学。平均吸附速率常数为0.148min~(-1)。发现吸附过程符合Langmuir吸附等温线。计算了不同温度时的吸附速率常数。吸附速率的控制因素是颗粒内的扩散。测定了不同温度时的传质系数和颗粒内扩散系数。本文研究表明,低温和低pH值有利于除去Cr~(+6)。
In this paper, the use of porcelain clay as a cheap adsorbent to remove Cr ~ (+6) in aqueous solution. Under the conditions of pH2.5 and temperature of 30 ℃, the maximum removal rate of Cr ~ (+6) solution with concentration of 0.5 × 10 ~ (-4) was 68%. The kinetics of the adsorption process is explained by the Lagergren equation. The average adsorption rate constant was 0.148min ~ (-1). The adsorption process was found to be in accordance with the Langmuir adsorption isotherm. The adsorption rate constants at different temperatures were calculated. The control factor for the rate of adsorption is intraparticle diffusion. The mass transfer coefficient and intraparticle diffusion coefficient were measured at different temperatures. The research in this paper shows that low temperature and low pH are good for removing Cr ~ (+6).