Application Research On Cellulose Modification And Adsorption On Heavy Metal Ions

The experiment prepares heavy metal ions adsorbent by Peanut shells Peanut shells modification. In the modification process, NaOH as Pretreatment chemical, CS2 as modification chemical, it studies the adsorb principle, process condition and desorption - regeneration method on Cr⁶⁺and Cu²⁺.In process of modified peanut shells adsorbing Cr⁶⁺and Cu²⁺, it is mains effected by pH, time, temperature and heavy metal ions initial concentration four factors.They have a strong interaction. When pH,pH, time, temperature are equal to 1, 75℃,30min separately, the adsorption efficiency of Cr⁶⁺ is 98%, unit adsorption is 4mg/g. When pH, time, temperature and Heavy metal ions initial concentration are equal to 7, 25℃,30min, 20ug/L separately, the adsorption efficiency of Cu²⁺ is 95%, unit adsorption is 2.7mg/g.In test ,alkali as desorption agent and dilute HCl as regenerative agent to desorb-regenerate Cr⁶⁺ adsorbent, it finds that Cr⁶⁺ could be desorbed from adsorbent by NaOH-Na2CO3 and the highest desorption rate is 15%, the maximum adsorption rate is 50% after regenerating. HCl-H2O2 as desorption agent and 5%NaOH solution as regenerative agent to desorb-regenerate Cu²⁺ adsorbent, after five times regenerative-adsorption, the highest desorption rate is 95%, the maximum adsorption rate is 85%.In the Cr⁶⁺-Cu²⁺ interference test, pH, time, temperature and heavy metal ions dosing quantity as influence factors, it finds that Cr⁶⁺ and Cu²⁺ have promotion function in adsorption process. When pH, time, temperature and Heavy metal ions dosing quantityl are equal to 1, 50℃,30min, 3.6 and 0.25mg/g separately, the adsorption quantity is maximum, it is 8.8mg/g.