Background

This paper aims to investigate the occurrence and removal characteristics of phthalate esters from bottled drinking water using silver modified roasted date pits. Three adsorbents, namely roasted date pits (RODP), silver-modified roasted date pits (S-RODP), and activated carbon (AC) were used to investigate their adsorption characterizations in removing dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), di-2-ethylhexyl phthalate (DEHP), and di-n-octyl phthalate (DNOP) from the collected bottle water samples.

Methods

The occurrences of the phthalate esters in the collected bottled water samples were carried out at different temperatures (30, 50, and 60 °C), and analyzed using gas chromatography-mass spectrometry analysis - selected ion monitoring. Batch adsorption isotherms were used to study and establish the efficiency of such adsorbents in removing phthalate esters, in which they describe the adsorbent-adsorbate interaction systems. Adsorption efficiency of the various adsorbents was investigated by using different adsorbent masses (0.05 g, 0.10 g, and 0.15 g) and temperature (30 °C, 50 °C, and 60 °C). Different physical and chemical characterizations were studied using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Brunauer-Emmett-Teller (BET) surface area, pore radius, and pore volume.

Results

The results indicated that the most abundant phthalate esters were DMP followed by DEP under 30 °C; however, DNOP was not detected in any of the tested water samples, except for one sample under 30 °C with a concentration of 0.031 μg/mL. The obtained results showed that phthalate esters leaching to the bottled drinking water were affected by storage temperature. The phthalate esters levels were increased with increasing the temperature to 60 °C. It was concluded that the ability of S-RODP for the adsorption of phthalate esters was better than the removal percentage obtained by AC and RODP. The removal percentage was increased from 90 to 99% by increasing the temperature from 30 to 50 °C and then decreased to 92.3% at 60 °C.

Conclusion

RODP was successfully used as an effective adsorbent for phthalate esters removal from drinking water. However, S-RODP has the highest removal abilities than other adsorbents due to the newly formed functional groups on its surface.

中文翻译：

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用银修饰的烤枣核从瓶装饮用水中邻苯二甲酸酯的发生和去除特性

背景

本文旨在研究使用银修饰的烤枣核从瓶装饮用水中邻苯二甲酸酯的发生和去除特性。使用三种吸附剂，即烤枣（RODP），银改性的烤枣（S-RODP）和活性炭（AC），研究了它们在去除邻苯二甲酸二甲酯（DMP），邻苯二甲酸二乙酯（DEP），收集的瓶装水样品中的邻苯二甲酸二丁酯（DBP），邻苯二甲酸丁苄酯（BBP），邻苯二甲酸二-2-乙基己酯（DEHP）和邻苯二甲酸二正辛酯（DNOP）。

方法

收集的瓶装水样品中邻苯二甲酸酯的出现是在不同温度（30、50和60°C）下进行的，并使用气相色谱-质谱分析法（选定的离子监测）进行了分析。间歇式吸附等温线用于研究和确定此类吸附剂去除邻苯二甲酸酯的效率，其中它们描述了吸附剂与吸附剂的相互作用系统。通过使用不同的吸附剂质量（0.05 g，0.10 g和0.15 g）和温度（30°C，50°C和60°C）研究了各种吸附剂的吸附效率。使用扫描电子显微镜（SEM），傅立叶变换红外（FTIR），Brunauer-Emmett-Teller（BET）表面积，孔半径和孔体积研究了不同的物理和化学特征。

结果

结果表明，在30°C下，邻苯二甲酸酯含量最高的是DMP，然后是DEP。但是，除了一个在30°C下浓度为0.031μg/ mL的样品外，在所有测试的水样品中均未检测到DNOP。所得结果表明，沥滤到瓶装饮用水中的邻苯二甲酸酯受储存温度的影响。随着温度升高至60°C，邻苯二甲酸酯含量增加。结论是，S-RODP吸附邻苯二甲酸酯的能力优于AC和RODP所获得的去除率。通过将温度从30°C升高到50°C，去除率从90％增加到99％，然后在60°C时降低到92.3％。

结论

RODP成功地用作从饮用水中去除邻苯二甲酸酯的有效吸附剂。然而，由于其表面上新形成的官能团，S-RODP具有比其他吸附剂更高的去除能力。