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Removal of Cd(Ⅱ) Ion from Aqueous Solution by Adsorption on Wasted Low Grade Phosphorus-Containing Iron Ore

机译:废低品位含磷铁矿石的吸附去除水溶液中的镉(Ⅱ)离子

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Low grade phosphorus-containing iron ore (LGPIO), a raw and wasted industrial solid material was used as an adsorbent to remove Cd(Ⅱ) ion from wastewater. The effects of initial pH value, adsorptive time, initial Cd(Ⅱ) ion concentration, adsorptive temperature and LGPIO dosage on the Cd(Ⅱ) ion removal efficiency were studied. The results show that the Cd(Ⅱ) ion removal efficiencies exceed 99.8% and Cd(Ⅱ) ion concentrations are less than 0.10 mg/L under the pH value 6, temperature 20 ℃, adsorptive time 90 min, initial Cd(Ⅱ) ion concentration 50 mg/L, particle size <0.15 mm, adsorbent dosage 50 g/L and stirring speed 290 r/min. After Cd(Ⅱ) ion removal reaction, the Cd(Ⅱ) ion concentrations completely complies with the requirement of national discharge standard of water pollutants for cadmium and zinc industry (GB 20466-2010) (TCd(Ⅱ) = 0.1 mg/L) in China. Therefore, it can be concluded that LGPIO is a new low-cost adsorbent which is suitable for the adsorption of Cd(Ⅱ) ion from wastewater.
机译:低品位的含磷铁矿石(LGPIO)是一种工业原料,它是一种浪费的工业废料,用于吸附去除废水中的Cd(Ⅱ)离子。研究了初始pH值,吸附时间,初始Cd(Ⅱ)离子浓度,吸附温度和LGPIO用量对Cd(Ⅱ)离子去除效率的影响。结果表明,在pH值为6,温度为20℃,吸附时间为90 min,初始Cd(Ⅱ)离子条件下,Cd(Ⅱ)离子的去除率超过99.8%,Cd(Ⅱ)离子浓度小于0.10 mg / L。浓度为50 mg / L,粒径<0.15 mm,吸附剂量为50 g / L,搅拌速度为290 r / min。 Cd(Ⅱ)离子去除反应后,Cd(Ⅱ)离子浓度完全符合镉锌工业用水污染物国家排放标准(GB 20466-2010)的要求(TCd(Ⅱ)= 0.1 mg / L)。在中国。因此,可以得出结论,LGPIO是一种新型低成本吸附剂,适用于从废水中吸附Cd(Ⅱ)离子。

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