Mechanism of protodesorption—exchange of heavy metal cations for protons in a heterophase system of H2O–H2SO4–MSO4—cellulose sorbent

Козлов, В. А.; Никифорова, Т. Е.; Loginova, V.A.; Койфман, О. И.

doi:10.1016/j.jhazmat.2015.08.004

Cited by 18 publications

(8 citation statements)

References 26 publications

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“…Сорбционные материалы могут быть как водорастворимыми, так и нерастворимыми в воде, в том числе сшитыми, они могут применяться в виде мембран, волокон, гелей или шариков [12][13]. Следует отметить, что гибридные материалы также представляют большой интерес для удаления катионов металлов из водных растворов.…”

Section: том 4 выпуск 3 2023unclassified

Effect of chemical modification of cotton cellulose by anthranilic acid on the sorption of Cu(II) and Fe(II) ions

Nokoforova

2023

From Chemistry Towards Technology Step-by-Step

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Аннотация. В работе выполнено модифицирование хлопковой целлюлозы антраниловой кислотой для получения нового сорбента, способного эффективно извлекать ионы тяжелых металлов из водных растворов. Модифицирование проводили в две стадии: на первой стадии получали диальдегидцеллюлозу за счет окисления целлюлозы метапериодатом натрия; на второй стадии диальдегидцеллюлозу обрабатывали антраниловой кислотой с получением готового сорбента. Определены оптимальные условия модифицирования хлопковой целлюлозы для достижения максимальной сорбции ионов железа(II) и меди(II). Исследованы равновесно-кинетические характеристики исходной и модифицированной хлопковой целлюлозы. Проведена обработка результатов кинетического эксперимента в рамках моделей кинетики псевдо-первого и псевдо-второго порядков. Сняты изотермы сорбции, проведена их обработка в рамках модели Ленгмюра и определены величины предельной сорбционной емкости (А∞).Показано, что модифицирование хлопковой целлюлозы позволяет заметно повысить ее сорбционную емкость. Установлено, что А∞ модифицированного сорбента примерно в 4-5 раз превосходит предельную сорбционную емкость нативной хлопковой целлюлозы по отношению к ионам Cu(II) и Fe(II). Получены и сопоставлены ИК-спектры целлюлозы, модифицированной антраниловой кислотой, и нативной целлюлозы. Получены СЭМ-изображения структуры поверхности исходной хлопковой целлюлозы и модифицированного сорбента.

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Section: том 4 выпуск 3 2023unclassified

Effect of chemical modification of cotton cellulose by anthranilic acid on the sorption of Cu(II) and Fe(II) ions

Nokoforova

2023

From Chemistry Towards Technology Step-by-Step

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“…Aqueous sulfuric acid solutions are used as media for various catalytic reactions and also for quantitative measurement of the basicity of compounds . Such essential processes as electrophilic substitution in the aromatic ring, etherification, molecular regrouping, and isomerization are performed in a medium of concentrated or water‐free sulfuric acid or even oleum.…”

Section: Proton Aciditymentioning

confidence: 99%

“…The direct knowledge of the degree of solvated proton hydration influences the interpretation of the mechanisms of numerous homogeneous and heterogeneous catalytic processes, enzymatic reactions, interphase ion‐exchange protodesorption, the formation, isomerization, hydrolysis of aromatic sulfonic acids and their functional derivatives, and the proton transfer in proton‐exchange polymer membranes and in solid electrolytes of electrochemical cells . The possibility of realization of the above processes is often determined by the solubility of the substrates, particularly of aromatic hydrocarbons, sulfonic acids, and their substituted derivatives…”

Section: Introductionmentioning

confidence: 99%

Solvated proton as the main reagent and a catalyst in the single-stage aromatic sulfonation and protodesulfonation of sulfonic acids

2017

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This review is devoted to the critical analysis of the existing contradictory ideas about kinetic description and the mechanisms of electrophilic aromatic substitution (EAS), ie, reversible arene sulfonation and hydrolysis (protodesulfonation) of arenesulfonic acids. Contemporary scientific and educational literature contains prevailing, widespread points of view on the multistage nature processes of the EAS that proceed via πand σ-complexes and are accompanied by arenium ion formation. This interpretation does not account for determining influence of the medium, and the process accompanies the loss of aromaticity. The review presents an alternative point of view: These processes proceed via singlestage and the same transition state. To substantiate this position, we reviewed in detail the contemporary ideas on the solvated proton structure, the limits of applicability of acidity function Н о and excess acidity Х scales, and the experimental solubility data of arenesulfonic acid hydrates in sulfuric acid. This solubility depends on the medium acidity (h o ), which provides the formation of 3 conjugated types of hydrates: anionic (АrSO 3 − ·H 2 O), hydroxonium-arene sulfonated (АrSO 3 − ·H 3 O + ), and the hydroxonium complex with the H-form of АrSO 3 Н·H 3 O + acid. In sulfuric acid solutions with an excess of water, irreversible hydrolysis proceeds with the participation of ArSO 3 − ·H 3 O + . However, protodesulfonation becomes reversible and proceeds with the participation of ArSO 3 Н·H 3 O + in solutions with an excess of sulfuric acid. A conclusion has been made about determining the role of the hydrated proton environment by means the formation of a cyclic transition state. An alternative 2-stage mechanism of EAS is logically and energetically unsubstantiated and, therefore, should be rejected.

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“…The rapid development of modified cellulose materials opens up new opportunities in water treatment and these materials have already been demonstrated to be very promising candidates for the treatment of high-volume and low-concentration polluted water . Through surface chemical modification with various functional groups or species such as carboxyl, cyclodextrin, metal ions, metals, metal oxides, cellulose materials can achieve excellent adsorption performance for water contaminants, including dyes, pesticides, Ag(I), Cu(II), Fe(III), Ni(II), Cr(VI), Cd(II), Hg(II), Pb(II), and so on. ,− …”

Section: Applications Of Cellulose-based Compositesmentioning

confidence: 99%

Cellulose as a Scaffold for Self-Assembly: From Basic Research to Real Applications

Tian

2016

Langmuir

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Cellulose has received a tremendous amount of attention both in academia and industry owing to its unique structural features, impressive physical-chemical properties, and wide applications. This natural polymer is originally used for packaging, paper, lightweight composites, and so forth and is now being developed for various new areas, such as antibacterial treatment, catalysis, water purification and separation, and biological and environmental analysis. In the current article, we summarize the recent developments in the self-assembly of cellulose with various species including metal ions and metal and metal oxide nanoparticles. Then we highlight several key application areas of cellulose-based composites by reviewing the recent representative literature in each area. A significant part of this review demonstrates some exciting innovations for a wide range of practical applications of cellulose-based composites. Some challenges are also discussed with a view toward future developments.

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Mechanism of protodesorption—exchange of heavy metal cations for protons in a heterophase system of H2O–H2SO4–MSO4—cellulose sorbent

Cited by 18 publications

References 26 publications

Effect of chemical modification of cotton cellulose by anthranilic acid on the sorption of Cu(II) and Fe(II) ions

Effect of chemical modification of cotton cellulose by anthranilic acid on the sorption of Cu(II) and Fe(II) ions

Solvated proton as the main reagent and a catalyst in the single-stage aromatic sulfonation and protodesulfonation of sulfonic acids

Cellulose as a Scaffold for Self-Assembly: From Basic Research to Real Applications

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