Magnetic nano adsorbent is cost-effective and easily synthesized in the laboratory by chemical Co-precipitation method that provides not only high adsorption capacity but also rapid adsorption rate. The magnetic nano adsorbents were synthesized by Ferric and Ferrous ions precursor solution in the presence of ammonium hydroxide. In the present investigation, a magnetic nano adsorbent has been employed for the removal of Pb (II) from an aqueous solution by batch adsorption technique along with photocatalysis. The different parametric study also carried out such as initial concentration of Pb (II), adsorbent dose, contact time, and Solution pH. The Pb (II) was fast adsorption and the equilibrium was achieved within 45 minutes. The amount Pb (II) adsorbed increases as the temperature increase. The optimal pH for Pb (II) was around 5.4 and for the removal of Pb (II) ions was up to 96.00%. The employed adsorbents were characterized by SEM, X-ray diffraction (XRD), Vibrating spinning magnetometer (VSM), and FTIR. The Kinetic of adsorption study was examined for the pseudo-first-order model and pseudo-second-order models. This Photocatalytic adsorption study obeys Pseudo second-order kinetic. The reusability and regeneration of magnetic nano adsorbents were studied and were recycled up to 87.00 %.

The effective removal of heavy metals from industrial wastewater is the most important issues for many industrialized countries and it is big challenge for human being. This research focuses on understanding adsorption process and developing a cost effective technology for treatment of heavy metals-contaminated industrial wastewater. In this investigation the Fe2O3 magnetic nano adsorbents are effective and posse’s high adsorption capacity and efficient removal rate. In this research article iron oxide nano adsorbents have been employed for the removal of Cd(II)ions from aqueous solutions by batch adsorption technique. The amount of Cd(II) ions adsorbed increases as temperature increased. The optimal pH values for Cd(II) ions removal was in between 5.5 to 6.5 different other parameters are also studied such as initial concentration of metals, catalyst dose, contact time etc. The kinetic study also have been investigated for this research article and it is observed that Cd(II) ions removed by Fe2O3 magnetic nano adsorbent obey pseudo first order and pseudo second order kinetics model effectively.

In present work Hengam island sands were used for preparation of new magnetic nano-adsorbent. These sands have intrinsic magnetic properties due to possess specific compounds such as Fe3O4. It was modified by surface activator agent namely 3-(Glycidyloxypropyl)trimethoxysilane to produce effective nano-adsorbent. After preparation of this nano-adsorbent, Its physical and chemical properties was verified using several techniques such as FTIR, TGA/DTG, XRD and SEM. Nano-adsorbent was used as a solid phase to extraction of cetirizine from aqueous solutions and then its determination was done by HPLC. Effective analytical parameters such as pH of sample solution (pH=4), dosage of nano-adsorbent (100 mg), zero charge (pHz=5), breakthrough volume (500 mL) and contact time (15 min) were evaluated and optimized. Furthermore, figures of merit parameters such as precision (RSD=1.44%), limit of detection (LOD=1.1 µg L-1) and linear dynamic range (LDR=0.01-250 mg L-1) were obtained. Also for validation the accuracy of method, amount of cetirizine in two real samples were successfully determined.

Background and Magnetite hydroxyapatite (m-Hap) as a magnetic nano-adsorbent was synthesized for the removal of tetracycline (TC) from aqueous solutions.
The properties of m-Hap were investigated by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). Factors affecting the adsorption of TC including pH (3-10), adsorbent dosage (0.1-5 g/L), contact time (5-120 min) and initial concentration of TC (10-25 mg/L) were investigated. The effect of adsorbent on the removal of tetracycline from real wastewater was also studied.
The nanocomposite was almost spherical in shape and about 20-30 nm in diameter. In optimum conditions more than 99% of TC was removed (contact time 60 min, adsorbent dose 1g/L, and pH 7.5). The equilibrium data were well fitted into Langmuir model (R2= 0.977) and the maximum adsorption capacity was 64.4 mg g-1 at pH 7.5 and 298 K. Adsorption experiments on hospital wastewater indicated a slight decrease in adsorption removal of TC (85%).
This study showed that the magnetic Hydroxyapatite nanoparticles could be used as a highly efficient and promising adsorbent in water and wastewater treatment systems.

In this research, Fe3O4@SiO2 magnetic core-shell nanoparticles functionalized with 1,4-dihydroxyanthraquinone molecules were synthesized and used to remove divalent copper ions from aqueous solutions. Then, the structural, crystalline, surface morphology, nanoparticle size, magnetic properties and thermal stability of synthetic nanoparticles were determined using Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, field emission scanning electron microscope, transmission electron microscope, vibrating sample magnetometer and thermal gravimetric analysis were investigated and identified. After the synthesis of magnetic nano adsorbent, the effect of different amount of adsorbent and study of absorption kinetics in the removal of divalent copper ions was investigated and the results showed that the use of 14 mg of adsorbent leads to the removal of copper ions with a maximum absorption of 96% at ambient temperature in a period of 28 minutes and at pH = 7. Finally, the recyclability and reusability of Fe3O4@SiO2-DAQ in the copper ion adsorption-desorption process was investigated using a magnetic magnet and the results confirm that this synthetic nanocomposite is an effective adsorbent with excellent performance to remove divalent copper ions.

A method for treating fuel oil and waste water of power plant is suggested which is including vanadium elimination through contacting with humic acid coated magnetic nano-adsorbent. The nano-adsorbent was modified with humic acid (HA) as a compound having carboxyl, hydroxyl and amin functional groups. HA/Fe3O4 nanoparticles were prepared by a co-precipitation procedure and were characterized using different techniques such as dynamic light scattering (DLS), Transmission electron microscopy (TEM), FTIR spectroscopy, X-ray diffraction spectroscopy. The surface charge of the nano-adsorbents was determined by Zeta potential technique and their magnetic properties were investigated by vibrational sample magnetometer (VSM). It was observed that the synthesized nanoparticles have a mean diameter about 14 nm. The effects of several experimental factors such as pH, adsorbent dosage, contact time and initial vanadium concentration, on the nano-adsorbent ability for vanadium removal were investigated. The best results were obtained using 10 mg/ml of nanoparticles at pH 5 and contact time 30 min. At this condition about 99.5 % of V(IV) could be removed from synthetic samples. Maximum adsorption capacity for vanadium (IV) was 8.97 mg/g which was fitted to Langmuir isotherm model. The ability of HA/Fe3O4 for the vanadium removal from fuel oil and wastewater of power plant was also investigated. It was observed that more than 93% of vanadium content could be removed from waste water and 67% form fuel oil using proposed nano-adsorbent.

One of the most important vitamins for human life is pantothenic acid (B5), because of its advantages such as production of blood cells, adrenal gland activity, stress management and energy production. The presence of this vitamin is important for plant growth and food production, because of its adsorption and determination were studied more than before.  Magnetic Nano adsorbent has been attracted great attention in the field of separation due to the simplicity, low cost and high speed. In this paper, the magnetic Nano composite modified with orange peel for adsorption efficiency of vitamin B5 from aqueous solution was synthesized. The Nano adsorbent structure was characterized using SEM-EDX, FTIR and XRD. The influence of adsorption parameters including pH, contact time, adsorbent dosage and initial concentration of B5 onto Nano adsorbent were evaluated. The best sorption of B5 via the Nano sorbent occurred at concentration of 300 mg L-1, 0.1 g of Nano adsorbent, 90 min of contact time at an optimum pH of 6. The Langmuir isotherm model (R2= 0.9899) was found to be fit with the isotherms data. The best kinetic model fit for adsorption of B5 from Nano adsorbent was found with the pseudo-first-order model (R2=0.9999).

Dyes are scientifically and generally a new type of environmental pollutions, which has caused worldwide concern. Many research has been done in this field to remove dyes from wastewater based on the adsorption process via nano-adsorbents. This study described the synthesis of a new magnetic nano-adsorbent based on chitosan hydrogel beads to remove methylene blue as the cationic dye from aqueous solutions. Chitosan hydrogel beads were cross-linked with cellulose and synthesized in the presence of magnetic bentonite nanoparticles (Fe3O4\Bent). Fe3O4\Bent nanoparticles were obtained from the synthesis of Fe3O4 magnetic nanoparticles in the presence of bentonite nanoclay by co-precipitation and in situ method. The structure of nano-adsorbents were investigated by FT-IR, XRD, FE-SEM, TEM, and VSM techniques. The adsorption capacities of hydrogel beads for Methylene blue dye were studied via different important parameters including the effect of pH, contact time, the effect of initial dye concentration and the effect of temperature. The results showed that the kinetic data and adsorption isotherm were best-correlated to the pseudo-second-order model and Langmuir model, respectively. The thermodynamic data (ΔG, ΔS, and ΔH) indicated that the adsorption process was spontaneous, favorable and endothermic.

Dyes in the textile industry are the most significant source of pollutants, which cause damaging effects to people’s health. Reactive black 5 (RD5) is an anionic color that is currently used in the textile industry. This study is designed to provide the strategies to synthesize and characterize the new family of functionalized magnetite nanoparticles via a chemical co-precipitation method with polyaniline modification groups on the surface. The effect of various parameters including pH, the initial concentration of RD5, the mass of adsorbent, contact time, temperature and ionic strength has been studied. Under optimal conditions, 10 mL of RD5 solution with a concentration of 30 mg/L, 20 mg of adsorbent, pH of 7 and contact time of 10 minutes, the color was completely removed. The results also showed that adsorption followed Langmuir isotherm (R2=0.998) and the maximum adsorption capacity was 63.69 mg/g. The results of kinetic studies also showed that the RD5 removal followed the pseudo-second-order equation with the correlation coefficient of R2=0.9984. The ΔG0 was negative at all temperatures which shows that the adsorption process was spontaneous. Conforming to our results, adsorption process by designed magnetic nano-adsorbent is an efficient and affordable method for eliminating RD5 from the industry.

In the present study, removal of dibenzothiophene (DBT) from model oil (n-hexane) was investigated using magnetic activated carbon (MAC) nano-composite adsorbent. The synthesized nano-composite was characterized by FT-IR, FE-SEM, BET and VSM techniques. The MAC nano-composite exhibited a nearly superparamagnetic property with a saturation magnetization (Ms) of 29.2 emu g-1, which made it desirable for separation under an external magnetic field. The magnetic adsorbent afforded a maximum adsorption capacity of 38.0 mg DBT g-1 at the optimized conditions (adsorbent dose, 8 g l-1; contact time, 1 h; temperature, 25 °C). Langmuir, Freundlich and Temkin isotherm models were used to fit equilibrium data for MAC nano-composite. Adsorption process could be well described by the Langmuir model. Kinetic studies were carried out and showed the sorption kinetics of DBT was best described by a pseudo-second-order kinetic model. In addition, the MAC nano-composite exhibited good capability of recycling to adsorb DBT in gasoline deep desulfurization.