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Development of a bio-adsorbent medium to remove arsenic from water

机译:生物吸附培养基的研制从水中除去砷

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The objective of this work was to study the removal of arsenic from water for human con-sumption by developing a bio-adsorbent using passion fruit, able to meet the maximum allowable limits of 0.025 mg L~(-1) established by Mexican NOM-127-SSA-1994. This was performed with synthetic water ([As] = 0.22 mg L~(-1)). The pectin was extracted using two methods, conventional acid extraction and alkali treatment with steam drag. After the pectin was extracted and characterized, experiments were performed to obtain adsorption kinetics and isotherms. The results showed adsorption kinetics of pseudo-second order with a rate constant of adsorption, k_(ad), of 2.107 g mg~(-1) min~(-1) for the acidic pectin and of 0.550 g mg~(-1) min~(-1) for the alkaline pectin. With regard to adsorption isotherms, the experimental data fitted thei Freundlich model, the KF being 2.08 for acidic pectin and 2.032 for alkaline pectin. Arsenic removal per-centages were 91% for acidic pectin and 81% for alkaline pectin.
机译:这项工作的目的是通过使用激情果实,通过开发生物吸附剂来研究从水中的砷从水中移除砷,能够满足由墨西哥的最大允许的0.025mg l〜(-1)的最大允许限制 - 127-SSA-1994。这是用合成水进行的([AS] = 0.22mg L〜(-1))进行。使用两种方法,常规酸提取和碱处理用蒸汽阻力来提取果胶。提取果胶蛋白并表征后,进行实验以获得吸附动力学和等温。结果显示伪二次阶的吸附动力学,其吸附速率常数,K_(Ad),2.107g mg〜(-1)min〜(-1)的酸性果胶和0.550g mg〜(-1 )碱性果胶的min〜(-1)。关于吸附等温线,实验数据拟合了TheI Freundlich模型,KF为酸性果胶和2.032用于碱性果胶的2.08。酸性果胶的砷除去每居民为91%,81%用于碱性果胶。

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