离子交换树脂吸附黄连素废水中铜离子的研究

Study on copper removal from berberine wastewater using ion exchange resin

以Cu^(2+)-黄连素混合体系的含铜制药废水为研究对象,考察3种离子交换树脂(D152、D113和D401)对含铜废水中Cu^(2+)和黄连素的吸附性能并对树脂进行了筛选,对D401树脂进行了吸附动力学和吸附热力学拟合分析,同时考察该树脂在黄连素竞争吸附影响下对Cu^(2+)的去除效果。最后,在静态试验基础上开展了动态试验,考察D401树脂柱在3种流速[1、2和5 BV(柱体积)/h]下,进样量为1~20 BV时出水的Cu^(2+)和黄连素浓度。结果表明:D401树脂的比吸附量随温度升高而增加,随树脂投加量的增加而降低;该树脂在较宽的pH范围内对Cu^(2+)具有很好的选择吸附性,pH为5.0是最佳吸附条件,此时比吸附量可达39.87 mg/g。吸附过程可以通过Langmuir吸附等温线和伪二级动力学模型进行描述。动态试验中,树脂柱在1 BV/h的流速下,对Cu^(2+)有较好的去除效果;在3种流速条件下,对黄连素的吸附率均较低,进一步验证了该型树脂对Cu^(2+)具有很好的选择吸附性。

Ion exchange resins（ D152,D113,D401） were applied to the treatment of pharmaceutical wastewater containing copper ions and berberine. The D401 was selected as optimal polymeric adsorbent based on the comparison of copper and berberine adsorption removal rates. In addition, the adsorption kinetics and thermodynamics were analyzed,and the Cu2＋removal efficiency of competitive adsorption process within berberine-copper system was investigated. Flowing experiments were carried out at 1 BV/h,2 BV/h and 5 BV/h flow velocity to investigate the effluent copper and berberine concentrations under the dosage of 1-20 BV. The results showed that adsorption ratio of D401 resin increased with temperature rising and declined with increasing resin dosage. The resin exhibited distinct selectivity of Cu2＋from berberine-copper system in a broad pH range. The best adsorption condition achieved 39. 87 mg/g at pH of 5. 0. The adsorption process could be described by Langmuirmodel and pseudo-second-order kinetic model. Flowing experiments showed that the 1 BV/h was the best condition.The removal of Cu2＋obtained better results under this flow velocity and the adsorption of berberine was not obviously at three flow velocities. The result verified that the D401 resin has a good selectivity for Cu2＋adsorption.