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Enhanced Adsorption Of Anionic Dyes Using Sr-Doped Zno Nanoparticles: Nonlinear Kinetics And Isotherm Studies, Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary

Al-Azhar Bulletin of Science

Using a co-precipitation process, sr-doped ZnO was prepared and demonstrated to be effective in the removal of anionic congo red dye, since its surface positive charge was increased to 17.3 mV. To investigate the surface morphology and physicochemical characteristics of Sr-doped ZnO, FTIR spectroscopy, scanning electron microscopy (SEM), elemental analysis, and point of zero charges (pHPZC) were employed. We conducted batch adsorption experiments to investigate the effects of contact time (180 minutes), pH (3.5–11), adsorbent dosage (0.5–3.0 g L−1), and temperature (288–328 K). The kinetic study was modeled using several equations, including pseudo-firstorder (PFO), pseudo-second-order (PSO), Elovich, and intra-particle diffusion …

Heavy Metal And Fluoride Ions Removal From Wastewater Using Moringa Seed Beads, Khalid Khader, Rabie Farag, Moustafa Abo-Elfadl, Mohamed Ali

Al-Azhar Bulletin of Science

Water contamination by heavy metals has harmful and hazardous health consequences for humans. The goal of this study is to see how effective Moringa seeds beads (MOSB) mixed with sodium alginate are at adsorbing ions like copper, nickel, manganese, lead and fluoride from polluted water. Different instrumental approaches were used to characterize the adsorbent (FT-IR and SEM).. Batch adsorption studies and the effects of the adsorption parameters were optimized. The results revealed that the removal rate for each element occurred at the optimum dose (5g/l) with removal efficiency (93, 72, 80, 96, and 93 %) and the maximum sorption capacity …

Synthesis, Structural Characterization, And Catalytic Reduction Study Of Co(Ii) Complex Towards Toxic Organic Compounds; Nitrophenol, And Nitroaniline, Aml Saleh, Abeer Faheim, Omayma Mostafa, Zeinab Abdelwahab, Aida Salman

Al-Azhar Bulletin of Science

This work demonstrates the synthesis of Co(II) complex of a new imine ligand incorporated sulfonamide, and coumarin moiety. The ligand and its complex were characterized by elemental analysis, IR, 1HNMR, mass, UV-Vis spectroscopy, molar conductance, magnetic susceptibility and thermal gravimetric analysis (TGA-DTG). According to the spectral analysis, the ligand, HL acts as a multidente donor coordinating through NONO donor sites. The Co(II) complex has tetrahedral geometry, and non-electrolytic in nature. The thermodynamic parameters as activation energy, enthalpy of activation, entropy of activation, and free energy of activation were determined via the thermal analysis. Furthermore, the ability of Co(II) complex as …

Modeling Of The Dynamics Adsorption Of Some Hazardous Elements From Aqueous Solution Onto Bentonite-Calcium-Alginate Beads, Riham Abou-Lilah, Nagwa Badway, Azza Gamal, Hoda Rizk, Amal Ali, Mostafa Elshorbagy

Al-Azhar Bulletin of Science

Encapsulation of bentonite-Ca-alginate was employed for discharge of Cs+, Sr2+, UO22+ and Co2+ from aquatic solution. Preferable pH for elimination of these ions was 5.5. For radiation stability, bentonite-Ca-alginate was investigated; a 60Co source was used to expose it to gamma radiation. Data obtained from (FT-IR) assessed radiation-induced effect on a stability of bentonite-Ca-alginate. Irradiated samples untill 100 kGy do not impair an absorption of an ions examined. In a column application, bentonite-Ca-alginate composite beads were examined for the discharge of these ions from multicomponent solution using fixed-bed column. Effect on column output of various parameters, like bed height, flow …

Synthesis And Characterization Of (Aam-Co-Ahps)/Mmt Hydrogel Composites For The Efficient Capture Of Methylene Blue From Aqueous Solution, Amin Elkony, Ahmed Ibrahim, Maher Abu El-Farah, Farg Abd-Elhai

Al-Azhar Bulletin of Science

In this study, Acrylamide-co-3-Allyloxy-2-hydroxy-1-propanesulfonic acid sodium salt/ montmorillonite [(AAm-co-AHPS)/MMT)] hydrogel composite was synthesis via in situ free-radical copolymerization. The swelling properties and adsorption efficiency of MB were studied. Effect of AHPS ratio on the properties of hydrogel composite was investigated at different AAm/AHPS molar ratio of 100/0, 95/5, 90/10, 85/15, and 80/20. The highest swelling ratio (49.71 g/g) was observed for the composite containing 15% AHPS. The hydrogel composites were characterized using FTIR, TGA, XRD, and SEM. The effects of contact time, dye concentration, pH, adsorbent dose, and temperature on the adsorption capacity of MB were studied. Additionally, the reusability …

Preparation Of Activated Carbon From Ion Exchange Resin Waste And Its Application For Manganese Removal From Groundwater, A. Swelam, Yahia Gedamy, Ahmed El.Shahed

Al-Azhar Bulletin of Science

The present study aims to synthesize an activated carbon adsorbent (S-AC, P-AC and OH-AC) from polystyrene divinyl benzene waste under different carbonization temperature (450oC and 900 oC and activation conditions (H2SO4, H3PO4 or NaOH). It being characterized and applied as an adsorbent for manganese removal from groundwater. FTIR results indicate that the changes in the peak intensities clear that the binding process was occurring on the surface of the adsorbent. Different factors such as solution pH, adsorbent dosage, contact time, temperature and Mn(II) initial concentration were investigated. The results showed that manganese adsorption capacity decreases with the increase of the …

Evaluation Of The Mechanisms And Effectiveness Of Nano-Hydroxides, Wood And Dairy Manure-Derived Biochars To Remove Fluoride And Heavy Metals From Water, Anna Rose Wallace, Wenjie Sun Dr, Chunming Su Dr

Civil and Environmental Engineering Theses and Dissertations

The development of effective treatment processes for the removal contaminants, such as fluoride and heavy metals, from polluted water have been urgently needed due to serious environmental health and safety concerns. In this dissertation, a variety of materials including various (hydro)oxide nanomaterials, biochars and surface modified biochar were studied to evaluate their effectiveness and mechanism on removing fluoride or mixed heavy metals from water.

In the Chapter 2, this study investigated the adsorptive removal of fluoride from water using various (hydro)oxide nanomaterials, focusing on ferrihydrite, hydroxyapatite (HAP) and brucite, which have the potential to be used as sorbents for surface …

Surface Oxygenation Of Biochar Through Ozonization For Dramatically Enhancing Cation Exchange Capacity, Matthew D. Huff, Sarah Marshall, Haitham A. Saeed, James Weifu Lee

Chemistry & Biochemistry Faculty Publications

Background

Biochar cation exchange capacity (CEC) is a key property that is central to biochar environmental applications including the retention of soil nutrients in soil amendment and removal of certain pollutants in water-filtration applications.

Results

This study reports an innovative biochar-ozonization process that dramatically increases the CEC value of biochars by a factor of 2. The ozonized biochars also show great improvement on adsorption of methylene blue by as much as a factor of about 5. In this study, biochar samples treated with and without ozone were analyzed by means of pH and CEC assays, water field capacity measurement, elemental …

Characterization Of Biochars Produced From Peanut Hulls And Pine Wood With Different Pyrolysis Conditions, James W. Lee, Bob Hawkins, Michelle K. Kidder, Barbara R. Evans, A. C. Buchanan, Danny Day

Chemistry & Biochemistry Faculty Publications

Background

Application of modern biomass pyrolysis methods for production of biofuels and biochar is potentially a significant approach to enable global carbon capture and sequestration. To realize this potential, it is essential to develop methods that produce biochar with the characteristics needed for effective soil amendment.

Methods

Biochar materials were produced from peanut hulls and pine wood with different pyrolysis conditions, then characterized by cation exchange (CEC) capacity assays, nitrogen adsorption–desorption isotherm measurements, micro/nanostructural imaging, infrared spectra and elemental analyses.

Results

Under a standard assay condition of pH 8.5, the CEC values of the peanut hull-derived biochar materials, ranging from …

Effects Of Activated Carbon Surface Chemistry Modification On The Adsorption Of Mercury From Aqueous Solution, Emily K. Faulconer

Publications

Mercury (Hg), a naturally occurring element, is toxic and can lead to negative health impacts for humans and ecosystems. Activated carbon adsorption is effective in treating Hg-laden aqueous effluent for safe discharge. Two modifications of commercially available activated carbon were investigated: iron impregnation to allow for magnetic sorbent recapture and wet chemical oxidation to enhance aqueous Hg capture. The modified carbons were characterized by nitrogen adsorption-desorption, XRD, pHpzc, vibrating sample magnetometry, elemental analysis, and total acidity titration. The 3:1 C:Fe magnetic powdered activated carbon (MPAC) retained a high surface area of 790 m2 /g and was 95% magnetically recoverable, with …

Kinetics And Thermodynamic Studies On Removal Of Copper Metal Ion From Aqueous Solution Using Rice Straw, A. El-Zomrawy, M. Thabet, M. Awad, A. Swalem, M. Abo-Shouk

Al-Azhar Bulletin of Science

The adsorption percentage of Cu(II) ions from aqueous solution in the absence and in the presence of different concentration of hydrochloric acid on rice straw (SIII) and its ash (R400) were studied in a modified batch adsorption technique. The kinetic data was analyzed using various kinetic models particularly pseudo-first-order, pseudo-second-order and intra-particle diffusion. The pseudo-second-order kinetic model was found to agree well with the experimental data. Thermodynamic parameters such as enthalpy (DH°), free energy (DG°) and entropy (DS°) changes towards calculated and adsorption process was spontaneous at R400 in the absence and in the presence of 0.005 M HCl and …