Adsorption of diclofenac sodium from aqueous solution using polyaniline as a potential sorbent. I. Kinetic studies

Bajpai, Sunil; Bhowmik, Mousumi

doi:10.1002/app.32263

Cited by 55 publications

(25 citation statements)

References 36 publications

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“…Bajpai and Bhowmik suggested that the deviation from straight lines through the origin may be due to the difference between the rates of mass transfer in the initial and final steps of adsorption . This deviation also suggested that pore diffusion was not the sole rate‐controlling step.…”

Section: Resultssupporting

confidence: 60%

Sorption mechansim of pharmaceuticals from aqueous medium on ionic liquid modified biomass

Lawal

Moodley

2016

J of Chemical Tech & Biotech

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BACKGROUND The global use of antibiotics has become a serious concern because of its variety of potential adverse effects when present in the environment. Acute and chronic toxicity, impact on aquatic organisms, disruption of microbial populations, and dissemination into antibiotic‐resistant genes have reportedly been linked to pharmaceuticals. Therefore, the aim of this study was to investigate the mechanism of remediation of some selected pharmaceuticals in aqueous medium on ionic liquid modified biomass. RESULTS The mechanism of sorption of pharmaceuticals on biomass and biomass modified with an ionic liquid (IL) was investigated. Kigelia pinnata (KP) was modified with IL to form modified biomass (KP‐IL). The pharmaceuticals investigated were ibuprofen (IBU), ketoprofen (KET), ampicillin (AMP) and diclofenac (DCL). Optimum adsorption was at pH 2.5 for AMP and pH 5 for IBU, KET and DCL. Sorption data for all the pharmaceuticals were best described by pseudo‐second‐order kinetics and the Langmuir adsorption isotherm. Maximum sorption capacities of 251.2, 197.1, 276.8 and 73 mg g−1 were obtained for KET, DCL, IBU and AMP, respectively. CONCLUSION The study showed that KP‐IL is a good material for the remediation of pharmaceuticals, and the adsorption capacity was far better than that of the unmodified KP and biomasses previously reported in literature. © 2016 Society of Chemical Industry

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Section: Resultssupporting

confidence: 60%

Sorption mechansim of pharmaceuticals from aqueous medium on ionic liquid modified biomass

Lawal

Moodley

2016

J of Chemical Tech & Biotech

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“…The adsorption kinetics for all three contaminants were better described by the pseudo-second-order model, i.e., the rate of adsorption was proportional to the square of the number of unoccupied sites on the surface of Al-Mg/GO composites and to the concentration of contaminants in the solution. Similar kinetic results have been reported for adsorbing these contaminants on the surface of different adsorbents [21,30,58]. The pH evolution during the adsorption process exhibited the same trend (approaching the pH pzc ) for all three contaminants (Fig.…”

Section: Adsorption Isotherms and Kineticssupporting

confidence: 74%

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Ahmadi

Yang

Jones

et al. 2018

Adv Compos Hybrid Mater

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Separation-free Al-Mg/graphene oxide (Al-Mg/GO) composites were synthesized by facile one-pot hydrothermal treatment and examined for adsorptive removal of representative contaminants (phosphate, copper (II), and Diclofenac (DCF)) in urban stormwater runoff. The Al-Mg/GO composites exhibited good adsorption capacity for all three contaminants. The adsorption isotherm and kinetics are well described by Freundlich model and pseudo-second-order model, respectively. Further, adsorption of phosphate and DCF favored acidic conditions while an opposite trend was observed for copper (II), which can be ascribed to the change of surface charge of the composites at different pH. The presence of different ions commonly present in environmental matrices (humic acid, bicarbonate, and sulfate) exhibited different effects on the contaminants' removal. Bicarbonate inhibited phosphate and DCF adsorption but promoted copper (II) removal. Copper (II) adsorption was also increased through chemical complexation and electrostatic attraction as a result of humic acid/sulfate adsorption on the adsorbents. The adsorption mechanisms include electrostatic interaction for all three contaminants, Lewis acid-base interactions and surface complexation for phosphate, π-π interactions for DCF, and cation-π interactions for copper (II). More than 75% adsorption capacities were maintained after 4 cycles of adsorption/desorption/regeneration, indicating good reusability. The Al-Mg/GO composites show great potential as a multifunctional adsorptive material for urban stormwater management.

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“…The concentration of ibuprofen sorbed q e (mg/kg) onto sediment was determined using the following equation (Amin 2008; Bajpai and Bhowmik 2010): …”

Section: Methodsmentioning

confidence: 99%

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Oh¹,

Shin

Kim

2016

Environ Sci Pollut Res

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Ibuprofen is well known as one of the most frequently detected pharmaceuticals and personal care products (PPCPs) in rivers. However, sorption of ibuprofen onto sediment has not been considered in spite of its high K ow (3.5). In this study, the effects of various environmental conditions such as pH (4, 5.3, and 7), the concentrations of dissolved organic matters (0 to 1.0 mM citrate and urea), salinity (0, 10, 20, and 30 part per thousand), and presence of other PPCP (salicylic acid) on ibuprofen sorption were investigated. Linear model mainly fitted the experimental data for analysis. The distribution coefficient (K d) in the linear model decreased from 6.76 at pH 4 to near zero at pH 7, indicating that neutral form of ibuprofen at pH below pKa (5.2) was easily sorbed onto the sediment whereas the sorption of anionic form at pH over pKa was not favorable. To investigate the effect of dissolved organic matters (DOMs) on ibuprofen sorption, citrate and urea were used as DOMs. As citrate concentration increased, the K d value decreased but urea did not interrupt the ibuprofen sorption. Citrate has three carboxyl functional groups which can attach easily ibuprofen and hinder its sorption onto sediment. Salinity also affected ibuprofen sorption due to decrease of the solubility of ibuprofen as salinity increased. In competitive sorption experiment, the addition of salicylic acid also led to enhance ibuprofen sorption. Conclusively, ibuprofen can be more easily sorbed onto the acidified sediments of river downstream, especially estuaries or near-shore environment with low DOM concentration.

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Adsorption of diclofenac sodium from aqueous solution using polyaniline as a potential sorbent. I. Kinetic studies

Cited by 55 publications

References 36 publications

Sorption mechansim of pharmaceuticals from aqueous medium on ionic liquid modified biomass

Sorption mechansim of pharmaceuticals from aqueous medium on ionic liquid modified biomass

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

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