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为了研究辉光放电电解等离子体(GDEP)的放电参数对所合成的纤维素基水凝胶材料吸附重金属离子性能的影响,采用不同的放电电压和放电时间制备了一系列纤维素基水凝胶材料,通过浸泡、恒温震荡、乙二胺四乙酸(EDTA)滴定实验检测了水凝胶对重金属离子的吸附能力,利用准2级动力学模型和朗缪尔(Langmuir)等温方程描述了不同放电参数下制得的水凝胶吸附重金属离子的吸附动力学。研究结果表明:不同放电电压和放电时间对纤维素基水凝胶吸附重金属离子的吸质比有较大影响;纤维素基水凝胶对重金属离子的吸质比随着p H值的增加而增大,可在60 min时间内达到吸附平衡;吸附机制为离子交换吸附,吸附动力学可用准2级动力学模型和Langmuir等温方程描述;水凝胶经过吸附-脱附8次循环后,仍有较高的吸附效率。最终得出的结论为:在放电电压为620 V、放电时间为90 s的条件下,制得的纤维素基水凝胶对重金属离子Pd2+、Cd2+和Zn2+的最大吸质比分别可达0.597、0.425和0.168。该研究结论可以为进一步拓展液相放电技术的应用领域,处理重金属离子污染的废水提供理论依据。
In order to study the influence of the discharge parameters of glow discharge electrolytic plasma (GDEP) on the adsorption of heavy metal ions on the synthesized cellulose-based hydrogel materials, a series of cellulose-based hydrogels were prepared by using different discharge voltage and discharge time The adsorption capacity of hydrogels to heavy metal ions was measured by immersion, constant temperature shaking and ethylenediaminetetraacetic acid (EDTA) titration. The parameters of Quasi-2 kinetic model and Langmuir isotherm were used to describe the different discharge parameters Adsorption Kinetics of Heavy Metal Ions Adsorbed on Hydrogels. The results showed that the different discharge voltage and discharge time had a significant effect on the adsorption of heavy metal ions on cellulose-based hydrogels. The adsorption ratio of cellulose-based hydrogels to heavy metal ions increased with the increase of p H value And the adsorption equilibrium can be reached within 60 min. The adsorption mechanism is ion exchange adsorption. The adsorption kinetics can be described by quasi-second-order kinetic model and Langmuir isotherm equation. After the hydrogel has been adsorbed-desorbed for 8 cycles, A higher adsorption efficiency. The final conclusion is that under the conditions of discharge voltage of 620 V and discharge time of 90 s, the maximum absorbency ratios of the prepared cellulose-based hydrogels to heavy metal ions Pd2 +, Cd2 + and Zn2 + are up to 0.597, 0.425 and 0.168. The conclusions of this study can provide theoretical basis for further application of liquid phase discharge technology and treatment of wastewater contaminated by heavy metal ions.