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首页> 外文期刊>RSC Advances >Preparation and evaluation of heavy metal rejection properties of polyetherimide/porous activated bentonite clay nanocomposite membrane
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Preparation and evaluation of heavy metal rejection properties of polyetherimide/porous activated bentonite clay nanocomposite membrane

机译：聚醚酰亚胺/多孔膨润土黏土纳米复合膜的重金属排斥性能制备与评价

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摘要

The acid activated bentonite clay ranging from 1.0 to 4.0 wt% was incorporated into polyetherimide membranes and was extensively studied for its morphology, porosity, membrane hydraulic resistance and hydrophilic properties. The nanocomposite membrane has shown an increment in porosity, hydrophilicity and a reduction in hydraulic resistance. Elemental mapping studies confirmed the intercalation of activated bentonite clay within the polymer matrix. Studies have been conducted to analyse the permeate flux and rejection of Cu(II), Ni(II) and Cd(II) ions by varying the pH and initial feed concentration. The results revealed that membranes with higher clay dosage showed enhanced flux and rejection, whereas lower rejection was observed in the case of lower pH and higher initial feed concentrations. It has also been demonstrated that the affinity of metal ions to form the hydration sphere and the adsorption capacity towards bentonite clay plays a vital role in the effective removal of metal ions. The membrane showed good rejection of heavy metal ions without any external chelating agent. The membranes showed maximum rejection of 69.3%, 76.2% and 82.5% for 250 ppm of Cd(II), Ni(II) and Cu(II) ion solutions, respectively. The low level of heavy metal concentration in the permeate indicates that good quality water could be reclaimed for further reuse.
机译：将1.0-4.0重量％的酸活化的膨润土粘土掺入聚醚酰亚胺膜中，并对其形态，孔隙率，膜耐水压性和亲水性进行了广泛的研究。纳米复合膜显示出孔隙率，亲水性的增加和水力阻力的降低。元素作图研究证实了活性膨润土在聚合物基质中的嵌入。已经进行了研究以通过改变pH和初始进料浓度来分析Cu（II），Ni（II）和Cd（II）离子的通量和截留率。结果表明，具有较高粘土用量的膜显示出较高的通量和截留率，而在较低的pH和较高的初始进料浓度下，则观察到较低的截留率。还已经证明金属离子形成水化球的亲和力和对膨润土的吸附能力在有效去除金属离子中起着至关重要的作用。该膜在没有任何外部螯合剂的情况下显示出对重金属离子的良好排斥。对于250 ppm的Cd（II），Ni（II）和Cu（II）离子溶液，膜的最大截留率分别为69.3％，76.2％和82.5％。渗透物中低水平的重金属浓度表明可以回收优质水以进一步使用。

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