Impact of surface modification on adsorptive removal of BTX onto activated carbon

Anjum, Hirra; Johari, Khairiraihanna; Gnanasundaram, Nirmala; Appusamy, Arunagiri; Murugesan, Thanabalan

doi:10.1016/j.molliq.2019.02.046

Cited by 37 publications

(18 citation statements)

References 45 publications

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“…This is possibly related to variations in crystalline structure due to molecular interactions, since changes in both peak intensity and position indicate formation of new phase 60 . Although one can assume that the change in complex peak intensity is due to the grinding, since crystallites size reduction can affect the XRD pattern 61 , the agreement between our XRD and DSC data regarding potential molecular interactions suggests the presence of inclusion complex in the co-ground product 49 .…”

Section: Resultssupporting

confidence: 58%

Encapsulation of Isoniazid-conjugated Phthalocyanine-In-Cyclodextrin-In-Liposomes Using Heating Method

Nkanga

Krause

2019

Sci Rep

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Liposomes are reputed colloidal vehicles that hold the promise for targeted delivery of anti-tubercular drugs (ATBDs) to alveolar macrophages that host Mycobacterium tuberculosis. However, the costly status of liposome technology, particularly due to the use of special manufacture equipment and expensive lipid materials, may preclude wider developments of therapeutic liposomes. In this study, we report efficient encapsulation of a complex system, consisting of isoniazid-hydrazone-phthalocyanine conjugate (Pc-INH) in gamma-cyclodextrin ( γ -CD), in liposomes using crude soybean lecithin by means of a simple organic solvent-free method, heating method (HM). Inclusion complexation was performed in solution and solid-state, and evaluated using UV-Vis, magnetic circular dichroism, 1 H NMR, diffusion ordered spectroscopy and FT-IR. The HM-liposomes afforded good encapsulation efficiency (71%) for such a large Pc-INH/ γ -CD complex (PCD) system. The stability and properties of the PCD-HM-liposomes look encouraging; with particle size 240 nm and Zeta potential −57 mV that remained unchanged upon storage at 4 °C for 5 weeks. The release study performed in different pH media revealed controlled release profiles that went up to 100% at pH 4.4, from about 40% at pH 7.4. This makes PCD-liposomes a promising system for site-specific ATBD delivery, and a good example of simple liposomal encapsulation of large hydrophobic compounds.

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Section: Resultssupporting

confidence: 58%

Encapsulation of Isoniazid-conjugated Phthalocyanine-In-Cyclodextrin-In-Liposomes Using Heating Method

Nkanga

Krause

2019

Sci Rep

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“…Benzene is highly carcinogenic, while toluene and p-xylene can cause some diseases of kidneys, skin and eyes upon longer exposure [3]. BTX are highly volatile in nature, and it is essential to eliminate these toxic materials from the water before draining the water into the environment [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Application of Carbon Nanotubes Decorated with Zinc Oxide Nanoparticles for Removal of Benzene, Toluene and p-Xylene from Aqueous Solution

Abussaud

2021

Sustainability

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The removal of benzene, toluene and p-xylene (BTX) from water is necessary to avoid various health and environmental concerns. Among various techniques, adsorption is suitable and widely used for the removal of BTX from water. In this study, the adsorption of BTX from water was performed using carbon nanotubes that were impregnated with zinc oxide nanoparticles. The impregnation was performed using the wet impregnation technique. The synthesized materials were characterized using scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) spectroscopy, thermogravimetric analysis (TGA) and nitrogen adsorption–desorption analysis. In batch adsorption experiments, the effect of adsorbent dosage, initial concentration, and contact time were investigated. The percentage removal for a given time and dosage was in the order of p-xylene > toluene > benzene. The kinetics models’ fitting revealed that the pseudo-second-order model fits well the adsorption of benzene, toluene and p-xylene with R2 > 99.4%. The results of adsorption isotherm fitting revealed the best fit with Sips isotherm model (R2 > 99.7%) and the adsorption capacity was p-xylene: 125 mg/g > toluene:105 mg/g > benzene: 70 mg/g. This behavior is observed probably due to a decrease in solubility and an increase in the molecular weight of BTX.

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“…Carbon materials have been regarded as one of the potential low-cost adsorbents for the abatement of VOCs, for long. Here, granular activated carbon has been utilized for the adsorption of xylene, its successful application in different forms for VOCs removal is evident from the following literature review: (i) corncob-based activated carbons [19] (ii) resin-based activated carbon [20] (iii) carbonaceous materials [21] (iv) lignin-derived activated carbon [22] (v) activated carbon [23][24][25] (vi) activated carbon fibers [26,27] (vii) mesoporous carbon composites [28].…”

Section: Introductionmentioning

confidence: 99%

Fixed bed utilization for the isolation of xylene vapor: Kinetics and optimization using response surface methodology and artificial neural network

Gupta

Kumar

2020

Environmental Engineering Research

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This paper discusses the isolation of xylene vapor through adsorption using granular activated carbon as an adsorbent. The operating parameters investigated were bed height, inlet xylene concentration and flow rate, their influence on the percentage utilization of the adsorbent bed up to the breakthrough was found out. Mathematical modeling of experimental data was then performed by employing a response surface methodology (RSM) technique to obtain a set of optimum operating conditions to achieve maximum percentage utilization of bed till breakthrough. A fairly high value of R2 (0.993) asserted the proposed polynomial equation’s validity. ANOVA results indicated the model to be highly significant with respect to operating parameters studied. A maximum of 76.1% utilization of adsorbent bed was found out at a bed height of 0.025 m, inlet xylene concentration of 6,200 ppm and a gas flow rate of 25 mL.min-1. Furthermore, the artificial neural network (ANN) was also employed to compute the percentage utilization of the adsorbent bed. A comparison between RSM and ANN divulged the performance of the latter (R2 = 0.99907) to be slightly better. Out of various kinetic models studied, the Yoon-Nelson model established its appropriateness in anticipating the breakthrough curves.

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Impact of surface modification on adsorptive removal of BTX onto activated carbon

Cited by 37 publications

References 45 publications

Encapsulation of Isoniazid-conjugated Phthalocyanine-In-Cyclodextrin-In-Liposomes Using Heating Method

Encapsulation of Isoniazid-conjugated Phthalocyanine-In-Cyclodextrin-In-Liposomes Using Heating Method

Synthesis, Characterization and Application of Carbon Nanotubes Decorated with Zinc Oxide Nanoparticles for Removal of Benzene, Toluene and p-Xylene from Aqueous Solution

Fixed bed utilization for the isolation of xylene vapor: Kinetics and optimization using response surface methodology and artificial neural network

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