Abstract

A sorbent based on a copolymer of maleic anhydride with styrene, containing m-phenylenediamine fragments was synthesised. After drying at 50–60 ° С , the obtained sorbent was identified using IR spectroscopy. Further, a study of lead sorption by a synthesised sorbent was conducted. For this purpose, the effect of pH, time, ionic strength and metal concentration on sorption was determined. According to the experiment, the maximum sorption was established at рН = 6. Complete sorption of lead (II) wasobtained following 3 hours of metal contact with the sorbent. The effect of increase in ionic strength to 0.6 mol/L on sorption was shown to be insignificant, with a subsequent increase leading to a critical decrease in sorption value. The isotherm of lead sorption by the synthesised sorbent was constructed and the optimal concentration conditions studied. The analysis results demonstrated an increase in the concentration of lead (II) ions in the solution to provide higher values of sorbed metal concentration with the maximum occurring at a concentration of 6·10 -3 mol/L (pH = 6, С Pb +2 = 6·10 -3 mol/L, V sample = 20 mL, m sorb. = 0.05 g, CE = 405 mg/g). Under optimal conditions, the extraction degree of lead (II) ions exceeds 95 %. The study of sorption was carried out both under static and dynamic conditions. Additionally, the effect of various mineral acids (HClO 4 , H 2 SO 4 , HNO 3 , HCl) of the equal concentration on the desorption of lead (II) from the sorbent was studied. The maximum desorption of lead (II) was obtained in sulphuric acid. Thus, the proposed express technique including preliminary concentration of lead (II) with a synthesised sorbent provides quantitative isolation of lead (II) from a large sample volume with a complex background composition.

Highlights

  • Obtained following 3 hours of metal contact with the sorbent

  • The effect of increase in ionic strength to 0.6 mol/L on sorption was shown to be insignificant, with a subsequent increase leading to a critical decrease in sorption value

  • The analysis results demonstrated an increase in the concentration of lead (II) ions in the solution to provide higher values of sorbed metal concentration with the maximum occurring at a concentration of 6·10-3 mol/L

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Summary

Значение pН

Все дальнейшие исследования проводили при рH = 6. Изучено влияние ионной силы μ на сорбцию: ионная сила до 0,6 незаметно влияет на сорбцию, последующее же увеличение приводит к значительному уменьшению сорбции Что с увеличением ионного окружения функциональных групп уменьшается возможность комплексообразования свинца(II). Также была исследована зависимость сорбции от времени Полная сорбция свинца(II) происходит после 3 ч при статических условиях. Таблица 2 Влияние ионной силы раствора на величину сорбции свинца (II): mсорб = 50 мг, V = 20 мл, рН = 6

Значение μ
Первая Вторая Третья
БИБЛИОГРАФИЧЕСКИЙ СПИСОК
Determination of lead in water in the concentration
Критерии авторства

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