CAJ | 학술논문

为考察膨润土作为吸附剂对含Ni2+废水的处理效果,配制不同Ni2+初始浓度的溶液作为模拟废水,以山东莱阳鑫达矿业有限公司的天然钙基膨润土为吸附剂进行吸附试验. 结果表明:随着Ni2+初始浓度的增加,膨润土对Ni2+的吸附率逐渐降低;膨润土对Ni2+的吸附率随固液比的增加而提高,但增加固液比降低了单位吸附剂的利用率,还提高了后续处理的难度;振荡速度对于膨润土吸附效果影响不大,可以忽略;随着pH值的提高,膨润土对Ni2+的去除率逐渐提高;Ni2+的初始浓度为100 mg/L、固液比为12. 5 g/L、无振荡,自然pH时,Ni2+去除率可达95%以上. 为考察溶液pH对膨润土吸附Ni2+的影响,考察了不同pH条件下膨润土对Ni2+的饱和吸附量,并对其机理进行了分析,结果表明:当溶液pH<7时,H+会与Ni2+发生竞争吸附从而降低Ni2+吸附率;pH值的提高有利于Ni2+的去除,但pH>7. 5后Ni2+的水解成为主要去除机制;不同pH下,Ni2+的不同存在形态也对吸附率产生了影响. 试验结果对膨润土作为吸附材料的工业化应用具有指导意义.
위고찰팽윤토작위흡부제대함Ni2+폐수적처리효과,배제불동Ni2+초시농도적용액작위모의폐수,이산동래양흠체광업유한공사적천연개기팽윤토위흡부제진행흡부시험. 결과표명:수착Ni2+초시농도적증가,팽윤토대Ni2+적흡부솔축점강저;팽윤토대Ni2+적흡부솔수고액비적증가이제고,단증가고액비강저료단위흡부제적이용솔,환제고료후속처리적난도;진탕속도대우팽윤토흡부효과영향불대,가이홀략;수착pH치적제고,팽윤토대Ni2+적거제솔축점제고;Ni2+적초시농도위100 mg/L、고액비위12. 5 g/L、무진탕,자연pH시,Ni2+거제솔가체95%이상. 위고찰용액pH대팽윤토흡부Ni2+적영향,고찰료불동pH조건하팽윤토대Ni2+적포화흡부량,병대기궤리진행료분석,결과표명:당용액pH<7시,H+회여Ni2+발생경쟁흡부종이강저Ni2+흡부솔;pH치적제고유리우Ni2+적거제,단pH>7. 5후Ni2+적수해성위주요거제궤제;불동pH하,Ni2+적불동존재형태야대흡부솔산생료영향. 시험결과대팽윤토작위흡부재료적공업화응용구유지도의의.
To examine the adsorption of Ni2+ in aqueous solution using bentonite as adsorbent,a series of experiments were conducted with different concentration of Ni2+prepared as simulated wastewater and natural calcium bentonite from Xinda Mining Company in Laiyang County,Shandong Province as adsorbent. Results show that the adsorption decreases with increas-ing of initial Ni2+concentration but increases with ratio increasing of solid to liquid. Moreover,increasing of ratio of solid to liq-uid will reduce the unit utilization of adsorbent and increases the difficulty of subsequent processing. Oscillation speed has less impact on the adsorption and it can be ignored. The Ni2+ adsorption rate increases with pH increasing. The adsorption rate of Ni2+ is nearly above 95% with conditions of the initial concentration of 100 mg/L and the ratio of solid to liquid of 12. 5 g/L. The saturated adsorption amount of bentonite for Ni2+ is examined under different pH and the influencing mechanism of pH is also analyzed in order to study the effect of pH on the adsorption with bentonite. The adsorption of Ni2+ decreases when pH<7 due to the competitive adsorption of H+and Ni2+with bentonite. The increase of pH is benefit for the adsorption,but the hydrol-ysis becomes the dominant removal mechanisms when pH>7. 5. Furthermore,the existing form of Ni2+ under different pH also influences the adsorption mechanism. The results have great significance for bentonite used as adsorbent material in industrial application.