新型TCAS吸附树脂对水中Cd2+的吸附去除研究
Study on adsorption of Cd2+ in aqueous solution by a new type of TCASadsorbed resin
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摘要: 通过静态吸附试验,研究一种由超分子受体化合物磺化硫杂杯芳烃(TCAS)与树脂结合的产物——新型TCAS吸附树脂对重金属Cd2+的吸附去除性能,并初步探讨了吸附机理。试验研究结果表明,TCAS吸附树脂对Cd2+的饱和吸附量为14.45 mg/g。当温度为20℃,0.5 g TCAS吸附树脂对10 mL浓度为5 mg/L的Cd2+溶液吸附60 min时, Cd2+的去除率可达到99%以上。pH值是影响TCAS吸附树脂吸附效果的重要因素,在pH=5~9时,Cd2+的去除率随着pH值的升高而增大。在试验范围内,TCAS吸附树脂对Cd2+吸附符合Freundlich方程。吸附在TCAS吸附树脂上的Cd2+可洗脱回收,TCAS吸附树脂也可再生利用。 TCAS吸附树脂对重金属Cd2+的吸附机理主要归因于TCAS对Cd2+的络合作用。Abstract: Through the static tests, the capacity of a new TCAS-adsorbed resin to remove of Cd2+ was investigated,and the main mechanism of adsorption was also discussed. This new type of TCASadsorbed resin was made of a novel supramolecular compound named thiacalix[4]arenetetrasulfonate (TCAS) and anion exchange resin. The adsorbing results showed that the maximum adsorption capacities of the TCAS-adsorbed resin toward Cd2+ is 14.45 mg/g. The removal rate of Cd2+ in aqueous solution was up to 99% after 60 min at 20℃ when a 10 mL aqueous solution of Cd2+(5 mg/L) was adsorbed by 0.5 g TCAS-adsorbed resin. The pH value had an important effect on the adsorption of Cd2+ in wastewater treatment, when the pH was increased from 5 to 9, the removal rate would increase with the rise of pH. The isothermal adsorption of TCAS- adsorbed resin for Cd2+ fit Freundlich equation within the range of experimental concentration. The adsorption metal ions could be recovered while TCAS-adsorbed resin could be reused. The complexation was the main mechanism for TCAS to adsorb Cd2+.
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Key words:
- adsorption /
- TCAS-adsorbed resin /
- heavy metal /
- cadmium ion
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