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首页> 外文期刊>Journal of Hazardous Materials >Adsorptive removal of phenolic compounds using cellulose acetate phthalate-alumina nanoparticle mixed matrix membrane
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Adsorptive removal of phenolic compounds using cellulose acetate phthalate-alumina nanoparticle mixed matrix membrane

机译：醋酸纤维素邻苯二甲酸酯-氧化铝纳米粒子混合基质膜吸附去除酚类化合物

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摘要

Mixed matrix membranes (MMMs) were prepared using alumina nanoparticles and cellulose acetate phthalate (CAP) by varying concentration of nanoparticles in the range of 10 to 25 wt%. The membranes were characterized by scanning electron micrograph, porosity, permeability, molecular weight cut off, contact angle, surface zeta potential, mechanical strength. Addition of nanoparticles increased the porosity, permeability of the membrane up to 20 wt% of alumina. pH at point of zero charge of the membrane was 5.4. Zeta potential of the membrane became more negative up to 20 wt% of nanoparticles. Adsorption of phenolic derivatives, catechol, paranitrophenol, phenol, orthochloro phenol, metanitrophenol, by MMMs were investigated. Variation of rejection and permeate flux profiles were studied for different solutes as a function of various operating conditions, namely, solution pH, solute concentration in feed and transmembrane pressure drop. Difference in rejection of phenolic derivatives is consequence of interplay of surface charge and adsorption by alumina. Adsorption isotherm was fitted for different solutes and effects of pH were investigated. Catechol showed the maximum rejection 91% at solution pH 9. Addition of electrolyte reduced the rejection of solutes. Transmembrane pressure drop has insignificant effects on solute rejection. Competitive adsorption reduced the rejection of individual solute.
机译：使用氧化铝纳米颗粒和邻苯二甲酸醋酸纤维素（CAP），通过在10％到25％重量范围内改变纳米颗粒的浓度来制备混合基质膜（MMM）。通过扫描电子显微镜，孔隙率，渗透性，截留分子量，接触角，表面ζ电位，机械强度来表征膜。纳米粒子的添加增加了膜的孔隙率，渗透性，最高可达氧化铝的20 wt％。膜的零电荷点的pH为5.4。膜的Zeta电势在纳米颗粒的20％（重量）以下变得更负。研究了MMM对酚类衍生物，邻苯二酚，对硝基苯酚，苯酚，邻氯苯酚，间硝基苯酚的吸附。研究了不同溶质的截留率和渗透通量曲线随各种操作条件的变化，即溶液的pH，进料中的溶质浓度和跨膜压降。酚类衍生物排斥的差异是表面电荷和氧化铝吸附相互作用的结果。吸附等温线适合不同的溶质，并研究了pH的影响。邻苯二酚在溶液pH为9时显示出最高的排斥率91％。电解质的添加降低了溶质的排斥率。跨膜压降对溶质截留的影响很小。竞争性吸附减少了单个溶质的排斥。

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