Indian Jujuba Seed Powder as an Eco-Friendly and a Low-Cost Biosorbent for Removal of Acid Blue 25 from Aqueous Solution

Indian jujuba seed powder (IJSP) has been investigated as a low-cost and an eco-friendly biosorbent, prepared for the removal of Acid Blue 25 (AB25) from aqueous solution. The prepared biomaterial was characterized by using FTIR and scanning electron microscopic studies. The effect of operation variables, such as IJSP dosage, contact time, concentration, pH, and temperature on the removal of AB25 was investigated, using batch biosorption technique. Removal efficiency increased with increase of IJSP dosage but decreased with increase of temperature. The equilibrium data were analyzed by the Langmuir and the Freundlich isotherm models. The data fitted well with the Langmuir model with a maximum biosorption capacity of 54.95 mg g−1. The pseudo-second-order kinetics was the best for the biosorption of AB25 by IJSP, with good correlation. Thermodynamic parameters such as standard free energy change (ΔG0), standard enthalpy changes (ΔH0), and standard entropy changes (ΔS0) were analyzed. The removal of AB25 from aqueous solution by IJSP was a spontaneous and exothermic adsorption process. The results suggest that IJSP is a potential low-cost and an eco-friendly biosorbent for the AB25 removal from synthetic AB25 wastewater

Synthesis of Indonesian Kaolin-nZVI (IK-nZVI), Evaluation for the Removal of Pb(II) from Waste Streams

Removal of toxic pollutants such as heavy metals from wastewater is of utmost importance in the current century. Heavy metals have severed a big problem in the world. Several tools have been established to mitigate this problem. In this research paper, Indonesian Kaolin-nano zerovalent iron (IK-nZVI) was synthesized as a model adsorbent for Pb(II) removal from wastewater. The efficiency of IK supported nZVI for Pb(II) removal efficiency was estimated by accompanying batch experiments. The examined parameters included the amount of IK-nZVI, the concentration of Pb(II) removal and the effect of pH. The results revealed that the IK-nZVI was efficient for the removal of Pb(II) from waste water. © 2020 Author(s).The author Lakkaboyana Sivarama Krishna is grateful to the Graduate School and The Thailand Research Fund (IRG578001), Chulalongkorn University for providing financial support, Senior Postdoctoral Fellowship under Rachadapisaek Sompote Fund

Synthesis, Spectroscopic Characterization and Molecular Docking Studies of 2-Butyl-4-Chloro-5-Formylimidazole Thiosemicarbazone Cobalt (II) Complex

A novel 2-Butyl-4-chloro-5-formylimidazole thiosemicarbazonecobalt (II) complex is synthesized and characterized by using spectroscopic techniques like elemental analysis, FT-IR, HRMS, electronic spectral analysis and Powder-X-ray diffraction. The Co(II) complex is found to be highly efficient in inhibiting the growth of human pathogens likeS. aureusand B. megaterium with MIC value 12.0 μg/mL whose inhibition zones are almost comparable with the standard antibiotic. The synthesized complex well occupies in the active site of β- ketoacyl-acyl carrier protein synthase III enzyme (PDB: 1MZS), in consists of catalytic triad and adenine-binding site, so the designed compoundis promising for to treat bacterial infection. © 2019 Author(s)

Y3+ and Sm3+ co-doped mixed metal oxide nanocomposite: Structural, electrochemical, photocatalytic, and antibacterial properties

Nanocomposite materials (rare-earth doped) are famous and tend to demonstrate good features in all the fields like photocatalysis, electrochemical, and antibacterial. A Wet-chemical route was used to prepare NiO-CYO-CSO [NiO-Ce0.9Y0.1O2-δ–Ce0.9Sm0.1O2-δ] nanocomposite successfully for different uses. The growth of fluorite cubic structure and absence of secondary phase was detected by X-ray diffraction. Metal-oxygen bond at 410.7 cm−1 was unveiled by Fourier transform infrared spectroscopy. The morphology and element composition of the material was characterized using Scanning electron microscopy and Energy dispersive absorption X-ray spectroscopy. The optical bandgap of the sample was deliberated using UV-Vis spectroscopy and the projected bandgap of NiO-CYO-CSO composite was found to be 3.54 eV. Impedance studies were done at conditions such as the frequency range (40  to 6 kHz) and voltage-1.3 V. The photocatalytic and antibacterial activities of NiO-CYO-CSO nanocomposite was also examined. Furthermore, the synthesized NiO-CYO-CSO will apply to wastewater treatment and pharmaceutical applications

Facile synthesis of NiO-CYSO nanocomposite for photocatalytic and antibacterial applications

Ceria based metal oxide nanocomposites (combination with rare earth oxides) have become irreplaceable and tend to display great functioning in all kinds of arenas like as photocatalytic, electrochemical and biological. NiO-CYSO [NiO-Ce0.8Y0.2O2-??Ce0.8Sm0.2O2-?] nanomaterial was produced by the wet-chemical route for numerous purposes. The development of fluorite cubic crystal configuration detected and no secondary phase and metal-oxygen bond was disclosed by XRD and FTIR correspondingly. The morphological and elemental analysis of the prepared composite was carried out using SEM with EDAX. The optical bandgap of prepared nanocomposite was studied using UV?Vis spectroscopy. Electrochemical behaviour observed at conditions, voltage-1.3 V, and the frequency range ? 40 Hz to 6 kHz. The photocatalytic and antibacterial behavior of prepared NiO-CYSO nanocomposite also investigated, which gave outstanding results.Scopu

Kaolin-nano scale zero-valent iron composite(K-nzvi): Synthesis, characterization and application for heavy metal removal

The present study explored the synthesis of Kaolin-nano scale zero-valent iron composite (K-nZVI) by using chemical reduction method. Sorption characteristics of the K-nZVI for the removal of Cu(II) ions was studied in batch conditions. The physical and chemical structure of the K-nZVI composite was characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-XRF), X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Brunauer-Emmett-Teller studies (BET). The effect of pH, the initial metal ion concentration, and contact time on adsorption of Cu(II) onto K-nZVI was investigated. The K-nZVI exhibited good sorption performances over the initial pH range from 2.5 to 6.5. The kinetics data was studied by applying two sorption kinetic models (Pseudo-first and Pseudo-second-order) equations. The pseudo-second-order model was relatively suitable for describing the adsorption process. The equilibrium adsorption data is well fitted to Langmuir adsorption models. The maximum adsorption capacities of K-nZVI sorbent as obtained from Langmuir adsorption isotherm is found to be 178–200 mg g−1 for Cu(II). Sorption isotherm models (Langmuir and Freundlich) were applied to the experimental data. The adsorption kinetics was well represented by the pseudo second order rate equation, and the adsorption isotherms were better fitted by the Langmuir equation. The thermodynamic studies showed that the adsorption reaction of Cu(II) is endothermic processes. TheK-nVZI having number of features including easy preparation, environmentally friendly nature, low-cost and good sorption performance enable K-nZVI application in industrial purpose specifically in the field of industrial water treatment

(E)-2-[(2-Butyl-4-chloro-1H-imidazol-5-yl)methylidene]-N-methylhydrazine-1-carbothioamide monohydrate

The title thiosemicarbazide derivative, C10H16ClN5S·H2O, crystallized as a monohydrate. The molecule has an E conformation about the azomethine C=N bond that links the methylhydrazine-1-carbothioamide moiety to the imidazole ring. The butyl chain substituent on the imdazole ring is disordered over two sets of sites, with a refined occupancy ratio of 0.509 (9):0.491 (9). In the crystal, molecules are linked by O—H...N and N—H...O hydrogen bonds involving the solvent water molecule, forming chains along the c-axis direction. The chains are linked by O—H...S and N—H...S hydrogen bonds, forming a three-dimensional framework

High concentration arsenic removal from aqueous solution using nano-iron ion enrich material (NIIEM) super adsorbent

Nano iron ion enrich materials (NIIEM) is a new commercial adsorbent employed to remove inorganic arsenic (As) toxicant from aqueous solutions. In this study, BET, SEM, EDX, XRF, XRD and TG-DTG were used to characterize this commercial adsorbent before and after contact with As(III)/As(V). NIIEM is composed mostly of core shell Fe0 structure with an outer oxide and hydroxide shell. The SEM analysis of NIIEM after arsenic adsorption was characterized by the formation of agglomerates into larger particles (clusters). The XRD results revealed that NIIEM (Fe0) were transformed to Ferrihydrite (Fe5O7(OH)·4H2O) corrosion products at high concentration of As(III)/As(V) under acidic conditions. The batch experiments conducted to describe the adsorption affinity of NIIEM depicted that its adsorption kinetics adopted a pseudo-second-order model with high affinity for both As(III) and As(V) at initial pH 2.5. Maximum adsorption capacity determined at initial pH 2.5 from the Langmuir-Freundlich isotherm model was found to be 704.7 and 122.7 mg/g for As(III) and As(V), respectively. These results indicate that NIIEM has high adsorbent efficiency and it is very suitable for in-situ and ex-situ remediation of highly concentrated As(III) and As(V) toxicants in aqueous solutions

Adsorption of acid blue 25 from aqueous solution using zeolite and surfactant modified zeolite

In the present study, we have demonstrated the Indonesian natural zeolite and modified zeolite was used to remove the acid blue 25 (AB25) from wastewater. The adsorption capacity of AB25 on zeolite and modified zeolite (zeolite-CTAB) were investigated by various batch adsorption experiments. The modification effect on the surface of zeolite was analyzed using Fourier transforms infrared spectra, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence, and X-ray diffraction, respectively. The maximum removal of AB25 was obtained under acidic conditions at pH 2. The kinetic experimental results imply that the adsorption of AB25 onto these adsorbents well followed the second-order kinetic model. The maximum adsorption capacity of 64.2 mg/g was found in Zeolite at 30°C and 112.44 mg/g for zeolite-CTAB at 60°C. The results revealed that the adsorption of AB25 onto zeolite-CTAB fitted better to Langmuir model and Zeolite fitted better with Freundlich model. The AB25 adsorption on zeolite-CTAB increases with an increasing temperature indicates that the preferential adsorption may occur at a higher temperature. The positive value of ∆H° in zeolite-CTAB material thermodynamic parameters indicates that the process was an endothermic process. These results indicate that zeolite-CTAB has high adsorbent efficiency and it is promising adsorbents for removing the dye AB25