scholarly journals Bioavailability of lead using chemical extractants in soil treated with humic acids and activated carbon

2015 ◽  
Vol 46 (4) ◽  
pp. 663-668 ◽  
Author(s):  
Nielson Machado dos Santos ◽  
Adriana Maria de Aguiar Accioly ◽  
Clístenes Williams Araújo do Nascimento ◽  
Ivo Ribeiro Silva ◽  
Jorge Antonio Gonzaga Santos
Keyword(s):  
Activated Carbon ◽  
Humic Acids ◽  
Chemical Extractants

scholarly journals Adsorption Characteristics of Humic Acids by Granular Activated Carbon

1997 ◽  
Vol 15 (7) ◽  
pp. 507-516 ◽  
Author(s):  
S.H. Lin ◽  
C.M. Lin
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Surface Diffusion ◽  
Humic Acids ◽  
Granular Activated Carbon ◽  
Model Parameters ◽  
Adsorption System ◽  
Transfer Resistance ◽  
Liquid Phase Mass Transfer ◽  
Continuous Adsorption

The adsorption of humic acids on granular activated carbon has been investigated. A commerically available humic acid and that extracted from the bottom sludge of a dam were employed in the studies. Both batch and continuous adsorption experiments were conducted. A simplified competitive adsorption model in conjunction with the Freundlich isotherm was employed to represent the batch multicomponent adsorption system and a homogeneous surface diffusion model utilized to describe the continuous adsorption system in a packed-bed column. The model parameters were obtained by best fit of the models to the experimental adsorption data. The results indicated that the liquid-phase mass-transfer resistance, surface diffusion coefficient and the amount of adsorption on the activated carbon decreased with increasing molecular weight of the humic acid. It was also found that the adsorption of humic acid on the activated carbon was primarily a surface diffusion-controlled process.

Enhanced adsorption of humic acids on ordered mesoporous carbon compared with microporous activated carbon

2011 ◽  
Vol 30 (4) ◽  
pp. 793-800 ◽  
Author(s):  
Fengling Liu ◽  
Zhaoyi Xu ◽  
Haiqin Wan ◽  
Yuqiu Wan ◽  
Shourong Zheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Humic Acids ◽  
Mesoporous Carbon ◽  
Ordered Mesoporous Carbon ◽  
Ordered Mesoporous ◽  
Enhanced Adsorption

Humic acids elimination from aqueous media utilizing derived activated carbon from raw maize tassel on equilibrium, thermodynamic and kinetics

2019 ◽  
Vol 160 ◽  
pp. 250-259
Author(s):  
Mahboube Ebrahimi ◽  
Saideh Bagheri ◽  
Maryam Maleki Taleghani ◽  
Majid Ghorabani
Keyword(s):  
Activated Carbon ◽  
Humic Acids ◽  
Aqueous Media ◽  
Equilibrium Thermodynamic ◽  
Maize Tassel

scholarly journals COMPARATIVE CHARACTERISTICS OF SORPTION ACTIVITY OF SAMPLES OF NATIVE HUMIC ACID AND SOME ENTEROSORBENTS

2021 ◽  
pp. 45-55
Author(s):  
Татьяна Александровна Корельская ◽  
Екатерина Александровна Журавлева ◽  
Елена Анатольевна Айвазова ◽  
Наталья Алнксандровна Онохина
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Humic Acids ◽  
Binding Activity ◽  
Lead Ions ◽  
Lead Ion ◽  
Sorption Activity ◽  
Rate Of Absorption ◽  
Functional Features ◽  
High Lead

В работе приведен сравнительный анализ сорбционных свойств гуминовых кислот, выделенных из верхового торфа Архангельской области и некоторых энтеросорбентов (активированный уголь, полисорб и фильтрум-СТИ) по отношению к ионам Pb и Zn. Структурно-функциональные особенности гуминовых кислот определяют их высокую связывающую активность и прочность связывания Pb, а также достаточно высокую селективность к Zn. На основании полученных результатов, делается вывод о перспективности разработки и применения препаратов на основе гуминовых кислот в качестве энтеросорбентов. The paper presents a comparative analysis of the sorption properties of humic acids isolated from the top peat of the Arkhangelsk region and some enterosorbents (activated carbon, polysorb, and filtrum) with respect to Pbions. The structural and functional features of humic acids determine their high lead-binding activity and the binding strength of the lead ion, which is indicated by the maximum values of the calculated constants Г∞ and K. It is shown that the degree of affinity of the Filtrum preparation to lead ions is higher than that for humic acids and other sorbents. The highest rate of absorption of lead ions was found for activated carbon and humic acids. Based on the results obtained, it is concluded that the development and use of humic acid-based drugs as enterosorbents used in acute lead poisoning is promising.

Uranium sorption onto activated carbon prepared from rice straw: Competition with humic acids

2013 ◽  
Vol 280 ◽  
pp. 745-750 ◽  
Author(s):  
S.M. Yakout ◽  
S.S. Metwally ◽  
T. El-Zakla
Keyword(s):  
Activated Carbon ◽  
Rice Straw ◽  
Humic Acids

scholarly journals Efficient microwave degradation of humic acids in water using persulfate and activated carbon

2018 ◽  
Vol 16 (3) ◽  
pp. 1069-1075 ◽  
Author(s):  
Xianbing Zhang ◽  
Zhaoxia Ding ◽  
Juan Yang ◽  
Leslie Cizmas ◽  
Eric Lichtfouse ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Humic Acids

scholarly journals COMPARATIVE CHARACTERISTICS OF SORPTION ACTIVITY OF SAMPLES OF NATIVE HUMIC ACID AND SOME ENTEROSORBENTS

2020 ◽  
pp. 90-99
Author(s):  
Татьяна Александровна Корельская ◽  
Екатерина Александровна Журавлева ◽  
Наталья Александровна Зубова ◽  
Елена Анатольевна Айвазова
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Humic Acids ◽  
Binding Activity ◽  
Lead Ions ◽  
Lead Ion ◽  
Sorption Activity ◽  
Rate Of Absorption ◽  
Functional Features ◽  
High Lead

В работе приведен сравнительный анализ сорбционных свойств гуминовых кислот, выделенных из верхового торфа Архангельской области и некоторых энтеросорбентов (активированный уголь, полисорб и фильтрум-СТИ) по отношению к ионам Pb. Для количественной оценки сорбционной активности препаратов использовались математические модели Лэнгмюра и Фрейндлиха. Показано, что модель Лэнгмюра с наибольшей достоверностью описывает сорбционные процессы ионов свинца на поверхности прежде всего активированного угля. Сорбционные характеристики гуминовых кислот, полисорба и фильтрум-СТИ наиболее адекватно представляются с использованием математической модели Фрейндлиха, что подтверждает гетерогенность поверхностей соответствующих образцов. Структурно-функциональные особенности гуминовых кислот определяют их высокую свинецсвязывающую активность и прочность связывания иона свинца, на что указывают максимальные значения вычисленных констант Г и K. Продемонстрировано, что степень сродства препарата Фильтрум - СТИ к ионам свинца выше по сравнению с таковой для гуминовых кислот и других сорбентов. Наибольшая скорость поглощения ионов свинца выявлена для активированного угля и гуминовых кислот. На основании полученных результатов, делается вывод о перспективности разработки и применения препаратов на основе гуминовых кислот в качестве энтеросорбентов, используемых при острых отравлениях соединениями свинца. The paper presents a comparative analysis of the sorption properties of humic acids isolated from the top peat of the Arkhangelsk region and some enterosorbents (activated carbon, polysorb, and filtrum) with respect to Pbions. To quantify the sorption activity of drugs, Langmuir and Freundlich mathematical models were used. It is shown that the Langmuir model describes the sorption processes of lead ions on the surface of activated carbon with the greatest confidence. The sorption characteristics of humic acids, polysorb, and filtrum are most adequately represented using the Freundlich mathematical model, which confirms the heterogeneity of the surfaces of the corresponding samples. The structural and functional features of humic acids determine their high lead-binding activity and the binding strength of the lead ion, which is indicated by the maximum values of the calculated constants Г and K. It is shown that the degree of affinity of the Filtrum preparation to lead ions is higher than that for humic acids and other sorbents. The highest rate of absorption of lead ions was found for activated carbon and humic acids. Based on the results obtained, it is concluded that the development and use of humic acid-based drugs as enterosorbents used in acute lead poisoning is promising.

Photocatalytic oxidation and subsequent adsorption characteristics of humic acids

1996 ◽  
Vol 34 (9) ◽  
pp. 65-72 ◽  
Author(s):  
Miray Bekbölet ◽  
Ferhan Çeçen ◽  
Gülhan Özkösemen
Keyword(s):  
Activated Carbon ◽  
Humic Acid ◽  
Humic Acids ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Batch Reactor ◽  
Freundlich Isotherm ◽  
Oxidation Products ◽  
Adsorption Characteristics ◽  
Significant Change

Effect of TiO2 photocatalyzed oxidation on the degradation and decolorization of humic acids was studied. The photocatalytic oxidation products were further investigated in terms of adsorptivity on activated carbon. With photocatalytic oxidation in a lab-scale batch reactor significant decolorization and a decrease in UV280 and UV254 took place. Simultaneously there was a decrease in TOC and COD. Parallel to this an evolution of BOD5 was observed. Thus the BOD5/COD ratio increased with irradiation time and more biodegradable substances have been formed. A significant change in the structure of compounds in humic acid took place only after 3-4 hours of irradiation as determined by the decrease in COD/TOC ratio. Generally there was a slight decrease of adsorptivity after irradiation as concluded from the comparison of Freundlich isotherm constants for raw and irradiated humic acid. This decrease increased as the irradiation time increased. But for irradiation times to be used in practice in photocatalytic oxidation no significant change in adsorption is expected.

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