pH Controlled Reversible Interaction of Remazol Orange with Chitin

2017 ◽  
Vol 75 ◽  
pp. 25-36 ◽  
Author(s):  
Muhammad Mominur Rahman ◽  
Abdullah Muhammad Zakaria ◽  
Shaikat Chandra Dey ◽  
Md Ashaduzzaman ◽  
Sayed Md Shamsuddin
Keyword(s):  
Polymeric Materials ◽  
Textile Dye ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Separation Science ◽  
Sustainable Environment ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Ph Controlled

Biomaterials offer alternative opportunities to build sustainable environment compared to synthetic polymeric materials. Here, we utilized a naturally occurring and plentiful biopolymer, chitin, for the studies on interactive phenomena of a reactive textile dye, Remazol Orange (RO), from aqueous solution. The functional groups and crystallinity of chitin were examined by Fourier transform infrared spectroscopy (FT-IR) and x-ray diffraction (XRD) study. Scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were employed for the exploration of morphology and thermal stability of chitin. In order to investigate the effects of pH, contact time and initial RO concentration, batch studies were performed at room temperature of 25°C. Chitin exhibited a highly pH controlled reversible interaction with RO. RO was bounded 116.3 milligram per gram of chitin at pH 2.0 within 90 minutes of continuous shaking whereas 98.45% (w/w) RO were immediately unbounded from the chitin surface when the in-situ environment was changed at pH 10. Langmuir adsorption isotherm and pseudo-second order kinetic plot indicate homogeneous chemisorption and uniform monolayer of dye molecules on chitin surface. The findings from this study will certainly add value to analytical research leading to advanced applications in separation science and technology.

Characterization of natural- and organobentonite by XRD, SEM, FT-IR and thermal analysis techniques and its adsorption behaviour in aqueous solutions

Clay Minerals ◽  
2012 ◽  
Vol 47 (1) ◽  
pp. 31-44 ◽  
Author(s):  
G. A. Ikhtiyarova ◽  
A. S. Özcan ◽  
Ö. Gök ◽  
A. Özcan
Keyword(s):  
Surface Area ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Textile Dye ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Thermal Analysis Techniques

AbstractIn this study, natural bentonite was modified with hexadecyltrimethylammonium (HDTMA) bromide to obtain organobentonite (HDTMA-bentonite). Bentonite and HDTMA-bentonite were then characterized using XRD, XRF, SEM, FT-IR, thermogravimetric (TG) analysis, elemental analysis and Brunauer-Emmett-Teller (BET) surface area techniques. The HDTMA+ cation was found to be located on the surface and enters the interlayer spaces of smectite according to the XRD and SEM results. FT-IR spectra indicated the existence of HDTMA functional groups on the bentonite surface. The BET surface area significantly decreased after the modification due to the coverage of the pores of natural bentonite. After the characterization, the adsorption of a textile dye, Reactive Blue 19 (RB19), onto bentonite and HDTMA-bentonite was investigated. The maximum adsorption capacity of HDTMA-bentonite for RB19 was 502 mg g-1 at 20°C. The adsorption process followed a pseudo-second-order kinetic model and it was exothermic and physical in nature.

scholarly journals Removal of Direct 50 Dyes from Aqueous Solution Using Natural Clay and Organoclay Adsorbents

2015 ◽  
Vol 12 (1) ◽  
pp. 157-166 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Ph Value ◽  
Dye Adsorption ◽  
Hexadecyltrimethylammonium Bromide ◽  
Textile Dye ◽  
Order Kinetic ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Gibb’S Free Energy ◽  
Isotherm Equations

In this study, hexadecyltrimethylammonium bromide (HDMAB) - bentonite was synthesized by placing alkylammonium cation onto bentonite. Adsorption of textile dye such as direct Yellow 50 on natural bentonite and HDMAB -bentonite was investigated. The effects of pH, contact time,dosage clay and temperature were investigated experimentally .The Langmuir and Freundlish isotherms equations were applied to the data and values of parameters of these isotherm equations were evaluated. The study indicated that using 0.2 g of HDMAB (hexadecyltrimethylammonium bromide) lead to increase the percentage removal(R%) from 78% for pure bentonite to 99 %. The optimum pH value for the adsorption experiments was found to be pH=3 and therefore all the experiments were carried out at this pH value. The pseudo-second-order kinetic model agrees very well with the experimental results.Different thermodynamic parameters such as Gibb’s free energy, enthalpy and entropy of the on-going adsorption process have also been evaluated. The thermodynamic analyses of the dye adsorption on organoclay indicated that the system was endothermic in nature .

scholarly journals The study on adsorption behavior of 2,4-DCP in solution by biomass carbon modified with CTAB-KOH

2020 ◽  
Vol 82 (8) ◽  
pp. 1535-1546
Author(s):  
Dajun Ren ◽  
Hongyan Yu ◽  
Jian Wu ◽  
Zhaobo Wang ◽  
Shuqin Zhang ◽  
...  
Keyword(s):  
Removal Rate ◽  
Surface Group ◽  
Order Kinetic ◽  
Biomass Carbon ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Before And After ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Abstract In this study, rice straw was used to prepare biomass carbon, which was modified with KOH and cetyltrimethylammonium bromide (CTAB) to obtain modified biomass carbon (MBC). The biomass carbon (BC) before and after modification was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR), and the surface morphology, crystal structure and surface group characteristic BC were explored. The specific surface area and micropores of the modified biomass carbon increased significantly, the crystallinity was higher, and the pore structure was more clearly found. The adsorption performance of MBC for 2,4-dichlorophenol (2,4-DCP) was investigated. The results showed that under the best adsorption conditions ((2,4-DCP concentration (200 mg/L), MBC dosage (50 mg), pH (5.5), and loading time (60 min), temperature (room temperature)), the removal rate of 2,4-DCP was up to 42.5%, and adsorption capacity was 85.13 mg/g. The adsorption of 2,4-DCP on MBC materials was better explained by the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model. It was believed that the adsorption of 2,4-DCP by MBC was the monolayer adsorption process on the uniform surface of MBC at high concentration, and there was no interaction between the 2,4-DCP and MBC adsorbate during this process.

Recovery of recycled paper in the removal of the textile dye basic yellow 28: characterization and adsorption studies

2019 ◽  
Vol 34 (2) ◽  
pp. 218-227
Author(s):  
Radouane Laib ◽  
Samira Amokrane-Nibou ◽  
Djamel Nibou ◽  
Mohamed Trari
Keyword(s):  
Oxygen Demand ◽  
Textile Dye ◽  
X Ray Diffraction ◽  
Order Model ◽  
Recycled Paper ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Ph Range ◽  
Best Fit ◽  
Ft Ir Spectroscopy

Abstract A recycled newspaper pulp (NPP) was used in the adsorption of a basic textile dye (Sandocryl gold yellow, basic yellow 28: BY28). NPP was deinked and bleached for the homogeneity of the adsorbent and elimination of the anchor. The release of NPP was followed by measuring the absorbance and chemical oxygen demand (COD) in water. The NPP samples were characterized by X-ray diffraction and FT-IR spectroscopy while the morphology was visualized by the SEM technique and the chemical composition determined by the energy dispersive spectroscopy (EDS). The adsorption of BY28 on NPP was investigated by varying the contact time (0–160 min), pH (2–6), biosorbent dose (1–8 g) and initial BY28 concentration (25–200 mg L−1); the results show a good yield in the pH range (4–7). The adsorption isotherms were studied by the Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Tempkin models. A maximal NPP adsorption capacity of 91.21 mg g−1 at 20 °C was obtained. The kinetic study showed that the best fit is obtained with the pseudo second order model that correlates suitably the experimental data well.

Removal of hexavalent chromium from aqueous solution by calcined Zn/Al-LDHs

2016 ◽  
Vol 74 (1) ◽  
pp. 229-235 ◽  
Author(s):  
Hui-Duo Yang ◽  
Yun-Peng Zhao ◽  
Shi-Feng Li ◽  
Xing Fan ◽  
Xian-Yong Wei ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Precipitation Method ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Co Precipitation ◽  
Double Hydroxides

In this study, Zn/Al-layered double hydroxides (Zn/Al-LDHs) were synthesized by a co-precipitation method and characterized with X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Then the hexavalent chromium Cr(VI) adsorption experiments on calcined Zn/Al-LDHs were carried out to analyze the effects of pH, temperature, adsorption time, initial Cr(VI) concentration and adsorbent dosage on the removal of Cr(VI) from aqueous solutions. The maximum adsorption capacity for Cr(VI) on calcined Zn/Al-LDHs under optimal conditions was found to be over 120 mg/g. The kinetic and isotherm of Cr(VI) adsorption on calcined Zn/Al-LDHs can be described with the pseudo-second-order kinetic model and Langmuir isotherm, respectively.

scholarly journals Preparation of CoFe2O4/activated carbon@chitosan as a new magnetic nanobiocomposite for adsorption of ciprofloxacin in aqueous solutions

2018 ◽  
Vol 78 (10) ◽  
pp. 2158-2170 ◽  
Author(s):  
Mohammad Malakootian ◽  
Alireza Nasiri ◽  
Hakimeh Mahdizadeh
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Adsorbent Dosage ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Isotherm Equations

Abstract Ciprofloxacin (CIP) is considered as a biological resistant pollutant. The CoFe2O4/activated carbon@chitosan (CoFe2O4/AC@Ch) prepared as a new magnetic nanobiocomposite and used for adsorption of CIP. CoFe2O4/AC@Ch was characterized by Fourier transform-infrared (FT-IR), field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), vibrating-sample magnetometer (VSM), and Brunauer–Emmett–Teller (BET) surface area measurements. The pHZPC value of the nanobiocomposite was estimated to be 6.4 by solid addition method. The prepared magnetic nanobiocomposites can be separated easily from water by an external magnet and reused. The effect of CIP concentration (10–30 mg/L), adsorbent dosage (12–100 mg/L), contact time (5–30 min) and pH (3–11) as independent variables on ciprofloxacin removal efficiency was evaluated. Optimum conditions were obtained in CIP concentration: 10 mg/L, adsorbent dosage: 100 mg/L, contact time: 15 min and pH: 5. In this condition, maximum CIP removal was obtained as 93.5%. The kinetic and isotherm equations showed that the process of adsorption followed the pseudo-second order kinetic and Langmuir isotherm. The results indicate that the prepared magnetic nanobiocomposite can be used as good adsorbent for the removal of CIP from aqueous solution and can be also recycled.

scholarly journals Equilibrium and Isotherm Modeling of Toxic dye Adsorption onto Modified Apricot Stone

2018 ◽  
Vol 1 (1) ◽  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Dye Adsorption ◽  
Acid Activation ◽  
Order Kinetic ◽  
Bet Analysis ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

In the present study, adsorption of toxic dye Diret red 28 (acid benzidinediazo-bis-1- naphtylamine - 4- sulfonique) from aqueous solution was investigated using activated carbon synthesized with Phosphoric Acid activation. The synthesized adsorbent was analyzed using BET, FT-IR and SEM techniques. The BET analysis showed that the area provided by the synthesized activated carbon was 88.01 m2 g-1. The adsorption isotherms of Toxic dye onto ASAC are determined and correlated with common isotherms equations. The smaller RMSE values obtained for the Langmuir and Dubinin-R models indicate the better curves fitting, the monolayer adsorption capacity of toxic dye is found to be 32.85 mg.g-1 at temperature 25 o C and 23.42 mg.g-1 at temperature 65 o C at pH 13. The adsorption of toxic dye was carried out using a batch system and the effects of pH, contact time, adsorbent dosage, initial concentration and temperature on the adsorption capacity of synthesized adsorbent were investigated. Kinetics studies proved that for both metals, the kinetic data follows the pseudo second order kinetic model. In addition, the thermodynamics studies proved that the adsorption process of toxic dye could be considered spontaneous and endothermic.

Adsorption and reduction of carcinogenic organics by ordered semi-crystalline poly-m-chloroaniline

2021 ◽  
pp. 095400832110443
Author(s):  
Pankaj Gupta ◽  
Nakshatra Bahadur Singh ◽  
Mohit Sahni
Keyword(s):  
Oxidative Polymerization ◽  
Polymeric Materials ◽  
Spectroscopic Studies ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Anionic Dyes ◽  
Pseudo Second Order ◽  
Aromatic Nitro ◽  
First Time

Poly-m-chloroaniline has been synthesized by chemical oxidative polymerization of m-chloroaniline and confirmed by spectroscopic studies. Powder X-ray diffraction and FESEM studies confirmed ordered arrangement in poly-m-chloroaniline. The peak at lower angle such as 7.09° having d spacing of 12.53 Å shows ordered structure of PmClA which was further confirmed by layered morphology in the FESEM images. FTIR spectra confirm the stretching and vibration mode of polymeric m-chloroaniline ring. BET surface area and pore diameter of PmClA were found to be 121 m2/g and 15.184 nm. Poly-m-chloroaniline was found to have better adsorption capacity toward anionic dyes over cationic dyes. The anionic dye (IC and EY) was 98 and 99% removed in just 25 min, whereas the cationic dye (MG and Rh6G) was 87 and 83% removed in 30 min. Langmuir adsorption isotherm model and pseudo second-order kinetic equation fitted the data best. Mechanism of adsorption has also been proposed. This is suggested that polymeric materials can be used for purification of water. The reduction of aromatic nitro compounds to amino compounds using organocatalyst has been done for the first time.

Synthesis of Functionalized Magnetite Titanium Dioxide Nanocomposite for Removal of Acid Fuchsine Dye

2018 ◽  
Vol 21 (8) ◽  
pp. 583-593 ◽  
Author(s):  
Sara Rahnama ◽  
Shahab Shariati ◽  
Faten Divsar
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Magnetic Core ◽  
Fractional Factorial ◽  
Order Kinetic ◽  
Sorption Data ◽  
Salt Addition ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Objective: In this research, a novel magnetite titanium dioxide nanocomposite functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its ability for efficient removal of Acid Fuchsine as an anionic dye from aqueous solutions was investigated. Method: The core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium source for shell. The synthesized nanocomposites (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments. The various experimental parameters affecting dye removal efficiency were investigated and optimized using Taguchi fractional factorial design. Results: The synthesized adsorbent showed the highest removal efficiency of Acid Fuchsine (99 %) at pH= 3.5, without salt addition and during stirring at contact times less than 10 minutes. The study of kinetic models at two concentration levels showed the fast dye sorption on the surface of proposed nanocomposites with pseudo second order kinetic model (R2=1). Also, the fitting of Acid Fuchsine sorption data to Freundlich, Langmuir and Temkin isotherms suggested that Freundlich model gave a better fitting than other models (R2=0.9936, n=2). Conclusion: Good chemical stability, excellent magnetic properties, very fast adsorption kinetics and high removal efficiency make the synthesized nanocomposite as a proper recoverable sorbent for removal of Acid Fuchsine dye from wastewaters.

Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

2020 ◽  
Vol 16 (7) ◽  
pp. 880-892
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna Sezer ◽  
Erol Pehlivan
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Wood Sawdust ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Equilibrium Status

Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents. Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process. Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions. Conclusıon: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.

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