Adsorption of 2-mercaptobenzothiazole from aqueous solution by organo-bentonite

doi:10.1016/S1001-0742(12)60166-1

Journal of Environmental Sciences

Volume 25, Issue 6, 1 June 2013, Pages 1139-1144

https://doi.org/10.1016/S1001-0742(12)60166-1 Get rights and content

Abstract

The adsorption behavior of 2-mercaptobenzothiazole onto organo-bentonite was investigated. Natural bentonite from Gaozhou in Guangdong Province, China was collected. Organo-bentonite was prepared by intercalation of cetyltrimethyl ammonium bromide into the natural bentonite. The physicochemical properties of the prepared organo-bentonite were characterized by X-ray diffraction, N₂ adsorption-desorption isotherm and Fourier transform infrared spectroscopy. The results showed that montmorillonite is the main component of the natural bentonite. The basal spacing of the natural bentonite is 1.47 nm, which increased to 1.98 nm on intercalation with cetyltrimethyl ammonium bromide. Moreover, both the surface area and pore volume increased with intercalation. Clear CH₂ stretching (3000–2800 cm⁻¹) and scissoring (1480–1450 cm⁻¹) modes of the intercalated surfactants were observed for organo-bentonite. Compared with the pseudo first-order kinetic model, the pseudo second-order kinetic model is more suitable to describe the adsorption kinetics of 2-mercaptobenzothiazole onto organo-bentonite. The adsorption capacity of 2-mercaptobenzothiazole onto organo-bentonite increased with increasing initial concentration of 2-mercaptobenzothiazole, but decreased with increasing adsorbent dosage. The adsorption isotherm of 2-mercaptobenzothiazole onto organo-bentonite fits well with the Langmuir model. The maximum adsorption capacity of organo-bentonite for 2-mercaptobenzothiazole was 33.61 mg/g, indicating that organo-bentonite is a promising adsorbent for 2-mercaptobenzothiazole.

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Citation Excerpt :
Similarly, the modified organoclay mineral can greatly improve the adsorption capacity of BTHs. Ping Jing et al. [35] studied the adsorption of 2-mercaptobenzothiazole (MBT) from aqueous solution by cetyltrimethyl ammonium bromide modified organo-bentonite, the results indicated the maximum adsorption capacity of organo-bentonite for MBT was 33.61 mg/g, which was much higher than that of acid-treated clay adsorbent (10.80 mg/g) [36]. In our previous work [37], we used the novel amphoteric surfactant- cationic panthenol (CP) to modify acidified sodium-based montmorillonite (Na-AMt) to prepare organo-Mt (CPMMt), and the maximum adsorption capacity of CPMMt for BTH and 2-OH-BTH was 38.18 mg/g and 11.21 mg/g, respectively, which was much higher that of Na-AMt (11.39 mg/g and 4.01 mg/g, respectively).
The release of benzothiazoles into the environment has been reported to affect the ecological environment and human health, so it makes significant sense to remove benzothiazoles from aquatic environment. They are poorly eliminated by conventional wastewater treatment. A few studies have shown that benzothiazoles are difficult to bioaccumulate or sorb to particles, therefore, it is very meaningful to study their efficient adsorption. In this work, the novel combined modified montmorillonite with hydroxyl iron pillared and cationic panthenol intercalation (Fe-CPMMt) was firstly prepared and evaluated its removal effect for emerging contaminant-benzothiazole. The batch adsorption experiments showed that the maximum adsorption capacity of Fe-CPMMt for benzothiazole was 69.72 mg/g, while that of the original acidified sodium montmorillonite, alone hydroxyl iron pillared montmorillonite (Fe-AMt), alone cationic panthenol intercalated montmorillonite were 11.39 mg/g, 43.68 mg/g and 38.18 mg/g, respectively. The adsorption process for benzothiazole on Fe-CPMMt-1.0 conformed well to Langmuir isotherm adsorption model and the pseudo-second-order kinetic model, and was spontaneous and endothermic. Moreover, combining with the Zeta potential values of Fe-AMt and Fe-CPMMt-1.0, and with the help of Multiwfn wave function program based on density functional theory, the electrostatic attraction and coordination between Fe-AMt and benzothiazole, while the electrostatic interaction, hydrophobic partitioning, complexation, p-π/π, OH/π and CH/π interactions were verified between Fe-CPMMt and benzothiazole pollutant. The work confirmed that the novel combined modified montmorillonite with hydroxyl iron pillared and cationic panthenol intercalation has a better adsorption effect on benzothiazole. Combined with the insight into the adsorption mechanism from the atomic level, it might provide novel information for exploring a new more efficient inorganic-organic combined modified montmorillonite adsorbent for removing stubborn organic contaminants in water.
The adsorption and mechanism of benzothiazole and 2-hydroxybenzothiazole onto a novel ampholytic surfactant modified montmorillonite: Experimental and theoretical study
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Among them, the adsorption method is used most widely in effluents treatment because of its simple operation process, low-cost and efficient [24–29]. However, there are very few research reports on the removal of BTH and its derivatives by adsorption method [19,30,31]. In recent years, montmorillonite (Mt) has attracted extensive attention among many adsorbents owing to its good characteristics such as high specific surface area, chemical and mechanical stability, high cation exchange capacity, and negative feature of the surface [32–35].
A novel ampholytic surfactant (cationic panthenol, CP) modified montmorillonite (CPMMt) was firstly prepared and investigated its removal effect and mechanism for a class of emerging pollutants such as benzothiazole (BTH) and 2-hydroxybenzothiazole (2-OH-BTH) in water. Batch experiments were conducted to probe the effects of various conditions on the adsorption. The results showed CPMMt-1.0 had greater adsorption performance for BTH and 2-OH-BTH than Na-AMt (acidified Na-Mt), and the maximum equilibrium adsorption capacities of CPMMt-1.0 for BTH and 2-OH-BTH were three times that of Na-AMt. Zeta potential analysis, the effect experiments of solution pH combined with Multiwfn wave function program were carried out to inspect the electrostatic interaction. Furthermore, molecular dynamics simulation was applied to investigate the dynamics behavior of cationic panthenol (CP) and BTH or 2-OH-BTH in the interlamellar of montmorillonite. The results demonstrated that CP molecules presented a lateral bilayer structure, which was in good agreement with XRD experimental data, and the interaction between BTH and the surface of montmorillonite was stronger than that of 2-OH-BTH, which implies that the CPMMt-1.0 had better adsorption performance for BTH than 2-OH-BTH, which was consistent with the experimental results. The adsorption mechanism involved electrostatic interaction and hydrophobic partitioning.
2-Mercaptobenzothiazole as a corrosion inhibitor for carbon steel in supercritical CO <inf>2</inf> -H <inf>2</inf> O condition
2019, Applied Surface Science
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The adsorption performance is significantly better than that under non-supercritical state. It can be seen from spectra of S 2p that peaks of S-Fe bonds can be fitted at 162.0 eV under 8.5 MPa [26,37,48,49]. The occurrence of SO42− at 168.6 eV might be the SO42− in the experimental solution left on the steel surface by combining positive ions [22,37,48,50].
The corrosion inhibition performance of 2-mercaptobenzothiazole (MBTH) for carbon steel in a CO₂-H₂O system was investigated by weight loss, surface analysis, electrochemical measurements, and quantum chemical calculations. Results showed that MBTH could effectively protect carbon steel from CO₂ corrosion and inhibition efficiency of MBTH in supercritical CO₂ was higher than that in non-supercritical CO₂ situation. The differential capacitance curves revealed that excess positive charges would be on the surface of carbon steel in the supercritical-CO₂ system while negative charges accumulated on carbon steel surface in non-supercritical CO₂ condition. The adsorption model was proposed to explain the inhibition mechanism of MBTH.
SECM study of the pH distribution over Cu samples treated with 2-mercaptobenzothiazole in NaCl solution
2017, Electrochemistry Communications
This paper reports the effect of treatment with 2-mercaptobenzothiazole (2MBT) (a corrosion inhibitor) on pH distribution over Cu samples monitored in situ using scanning electrochemical microscopy (SECM) in potentiometric mode. Line scans were conducted over two copper wires embedded in insulating resin, one of which had been pre-treated with 2MBT. It was found that the treated Cu sample had a less acidic character than the non-treated sample. Furthermore, the pH above the resin areas is considerably more acidic than that above either Cu wire. This feature is attributed to the consumption of OH⁻ ions on the non-treated Cu wire during the formation of atacamite as a corrosion product, and the tautomeric equilibrium established by the detached 2-mercaptobenzothiazole molecules in the bulk electrolyte. These pH distributions are spatially resolved in the SECM mapping above both Cu wires.
Green in-situ synthesized silver nanoparticles embedded in bacterial cellulose nanopaper as a bionanocomposite plasmonic sensor
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MBT is also known as a poorly biodegradable pollutant that has potentially mutagenic, carcinogenic and allergenic influences on humans and can easily enter into the environment. Till now, many studies have been developed for the determination of MBT because of its manifold usages and toxic nature, but no attempts have been made to MBT sensing using AgNPs (Parham and Khoshnam, 2013; Jing et al., 2013). On the other hand, the importance of cyanide (CN−) sensing in the environmental samples has been clearly known, because it is one of the exceedingly toxic and hazardous ions that recognized to humankind even at low concentration.
Herein, we introduce a new strategy for green, in-situ generation of silver nanoparticles using flexible and transparent bacterial cellulose nanopapers. In this method, adsorbed silver ions on bacterial cellulose nanopaper are reduced by the hydroxyl groups of cellulose nanofibers, acting as the reducing agent producing a bionanocomposite “embedded silver nanoparticles in transparent nanopaper” (ESNPs). The fabricated ESNPs were investigated and characterized by field emission scanning electron microscopy (FE-SEM), UV–visible spectroscopy (UV–vis), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and energy-dispersive X-ray spectroscopy (EDX). The important parameters affecting the ESNPs were optimized during the fabrication of specimens. The resulting ESNPs were used as a novel and sensitive probe for the optical sensing of cyanide ion (CN⁻) and 2-mercaptobenzothiazole (MBT) in water samples with satisfactory results. The change in surface plasmon resonance absorption intensity of ESNPs was linearly proportional to the concentration in the range of 0.2–2.5 µg mL⁻¹ and 2–110 µg mL⁻¹ with a detection limit of 0.012 µg mL⁻¹ and 1.37 µg mL⁻¹ for CN⁻ and MBT, respectively.
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The important characteristic vibrations and their corresponding bands are given in Supporting information Table S1 [11,27–30]. In the case of Fe(dmbpy)32 + immobilized Na+-bt material (Fig. 1b) additional bands observed at 1483 and 1428 cm− 1 are attributed for CC stretching vibration whereas the band observed at 834 cm− 1 may be assigned to heterocyclic ring deformation (Table S1) [28,29]. The appearance of these bands suggests the successful incorporation of Fe(dmbpy)32 + in Na+-bt material.
Fe(dmbpy)₃^2 + (where dmbpy is 4,4′-dimethyl-2,2′-bipyridine) was immobilized by ion-exchange in a bentonite clay film coating on a glassy carbon electrode. Cyclic voltammetry characteristics of the immobilized Fe(dmbpy)₃^2 + were stable and reproducible corresponding to the Fe(dmbpy)₃^2 +/3 + redox process. In the presence of isoniazid (IZ), the electrogenerated in film Fe(dmbpy)₃^3 + oxidized IZ efficiently producing large anodic current. This current was linearly proportional to the IZ concentration in the solution. The process was described by an EC' electrocatalysis mechanism allowing for sensitive determination of IZ with a wide linear dynamic concentration range of 10.0 μM to 10.0 mM. The electrode was tested for its analytical suitability and possible discrimination of interferences by determining IZ in a commercially available pharmaceutical product. The paper reports on a simple, cheap, and easy to fabricate chronoamperometric chemical sensor for determination of IZ. Kinetic parameters, such as the catalytic rate constant (2.3 × 10³ M^− 1 s^− 1) and diffusion coefficient of IZ (5.42 × 10^− 5 cm² s^− 1), were determined using CV, chronoamperometry, and chronocoulometry.

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Adsorption of 2-mercaptobenzothiazole from aqueous solution by organo-bentonite

Abstract

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