scholarly journals Mechanism of Oxytetracycline Removal by Coconut Shell Biochar Loaded with Nano-Zero-Valent Iron

2021 ◽  
Vol 18 (24) ◽  
pp. 13107
Author(s):  
Qi Li ◽  
Siyu Zhao ◽  
Yuhang Wang
Keyword(s):  
Single Molecule ◽  
Zero Valent Iron ◽  
Ion Concentration ◽  
Coconut Shell ◽  
Batch Adsorption ◽  
Isothermal Adsorption ◽  
Pseudo Second Order ◽  
Nano Zero Valent Iron ◽  
Addition Amount ◽  
Coconut Shell Biochar

In this paper, coconut shell biochar (BC), pickling biochar (HBC), and nano-zero-valent iron-loaded biochar (nZVI-HBC) were prepared; these were used to remove oxytetracycline (OTC), and the removal mechanism and degradation product were analyzed. These biochars were characterized using SEM, XRD, FTIR, and XPS. The effects of biochar addition amount, pH, ion type, and ion concentration on OTC adsorption were studied by a batch adsorption experiment. Under the optimal conditions, the equilibrium adsorption capacity of nZVI-HBC to OTC was 196.70 mg·g−1. The adsorption process can be described by Langmuir isothermal adsorption equations, conforming to the pseudo-second-order dynamics model, indicating that adsorption is dominated by single-molecule chemical adsorption, and a spontaneous process of increasing heat absorption entropy. Mass spectrometry showed that the OTC removal process of nZVI-HBC included not only adsorption but also degradation. These results provide a practical and potentially valuable material for the removal of OTC.

scholarly journals Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 198 ◽  
Author(s):  
Yaorong Shu ◽  
Bin Ji ◽  
Baihui Cui ◽  
Yuting Shi ◽  
Jian Wang ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Zero Valent Iron ◽  
Good Effect ◽  
Isotherm Models ◽  
Almond Shell ◽  
Removal Experiments ◽  
Pseudo Second Order ◽  
Nano Zero Valent Iron ◽  
Cr Removal ◽  
Main Factor

Nano-zero-valent iron biochar derived from almond shell (nZVI-ASBC) was used for hexavalent chromium (CR) removal. Experiments showed that pH was the main factor (p < 0.01) that affected the experimental results. At a dosage of 10 mg·L−1 and pH of 2–6, in the first 60 min, nZVI-ASBC exhibited a removal efficiency of 99.8%, which was approximately 20% higher than the removal yield at pH 7–11. Fourier transform infrared spectroscopy results indicated N-H was the main functional group that influenced the chemisorption process. The pseudo second-order dynamics and Langmuir isotherm models proved to be the most suitable. Thermodynamic studies showed that the reaction was exothermic and spontaneous at low temperatures (T < 317 K). Various interaction mechanisms, including adsorption and reduction, were adopted for the removal of Cr(VI) using the nZVI-ASBC composite. The findings showed that the BC-modified nZVI prepared with almond shell exerts a good effect and could be used for the removal of Cr(VI).

Performance of Nano Zero-Valent Iron Derived from the Decomposition of Siderite in the Removal of Phosphate

2021 ◽  
Vol 21 (1) ◽  
pp. 623-631
Author(s):  
Yueling Zhao ◽  
Haibo Liu ◽  
Tianhu Chen ◽  
Dong Chen ◽  
Chen Chen ◽  
...  
Keyword(s):  
Orthogonal Experiment ◽  
Zero Valent Iron ◽  
Raw Material ◽  
Order Kinetic ◽  
Experimental Conditions ◽  
P Concentration ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Nano Zero Valent Iron

Natural siderite was selected as a raw material for preparing nano zero-valent iron (nZVI). The efficiency of the as-synthesized nZVI for PO3−4–P removal was investigated, and the effects of the annealing temperature, pH, initial PO3−4–P concentration, adsorption temperature and oxygen were investigated. The results indicated that after annealing at 550 °C, nZVI exhibited an average crystal size of 56.3 nm and a surface area of 14.1 m2/g. A decrease in pH and an increase in oxygen availability enhanced the removal efficiency. The adsorption process, which was spontaneous and exothermic according to the thermodynamic analysis, agreed well with the pseudo-second-order kinetic model. Based on the Langmuir equilibrium isotherms, the capacity of nZVI to adsorb phosphorus was determined to be 33.18 mg/L. The optimized conditions for the experimental conditions were defined by an orthogonal experiment as follows: initial P concentration 2 mg/L, initial pH 4, iron dose 2 g/L, adsorption time 60 min. The experimental results suggested that the as-prepared nZVI was a promising adsorbent for the removal of phosphate.

Removal of Mn(II) from Aqueous Solution Using Saponified Garlic Peel

2014 ◽  
Vol 694 ◽  
pp. 382-386 ◽  
Author(s):  
Bo Liang ◽  
Wan He Zhao ◽  
Kai Huang ◽  
Hong Min Zhu
Keyword(s):  
Metal Ion ◽  
Chemical Properties ◽  
Correlation Coefficients ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Physical And Chemical ◽  
Garlic Peel

The removal of Mn (II) ion by saponified garlic peel (S-GP) was investigated using batch adsorption. SEM and FT-IR were employed to investigate the physical and chemical properties of S-GP. The adsorption was evaluated as a function of initial metal ion concentration, contact time and temperature. The maximum adsorption capacity for Mn (II) was 0.51 mol/kg, and the adsorption process followed the Langmuir model. Pseudo-second-order models fitted the experimental data well and kinetic parameters, rate constants, equilibrium sorption capacity and related correlation coefficients at various temperatures were calculated and discussed. A possible adsorption mechanism based on a cation exchange was proposed for the adsorption of Mn (II).

Application of black walnut (Juglans nigra) husk for the removal of lead (II) ion from aqueous solution

2017 ◽  
Vol 75 (10) ◽  
pp. 2454-2464 ◽  
Author(s):  
O. S. Lawal ◽  
O. S. Ayanda ◽  
O. O. Rabiu ◽  
K. O. Adebowale
Keyword(s):  
Aqueous Solution ◽  
Entropy Change ◽  
Second Order ◽  
Black Walnut ◽  
Juglans Nigra ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Standard Entropy ◽  
Adsorption Model ◽  
Pseudo Second Order

The biosorption characteristics of Pb (II) ions from aqueous solution using black walnut (Juglans nigra) seed husk (WSH) biomass were investigated using batch adsorption techniques. The effects of pH, contact time, initial Pb (II) ion concentration, and temperature were studied. The Langmuir, Freundlich and Temkin isotherms were used to analyze the equilibrium data. It was found that the adsorption of Pb (II) ions onto WSH was best described by the Freundlich adsorption model. Biosorption kinetics data were tested using the pseudo-first order and pseudo-second order models, and it was observed that the kinetics data fitted the pseudo-second order model. Thermodynamic parameters such as standard Gibbs free energy change (ΔG0), standard enthalpy change (ΔH0) and standard entropy change (ΔS0) were evaluated. The result showed that biosorption of Pb (II) ions onto WSH was spontaneous and endothermic in nature. The FTIR study showed that the following functional groups: O-H, C = O, C-O, C-H and N-H were involved in binding Pb (II) ions to the biomass.

scholarly journals 3-aminopropyltriethoxysilane functionalized nanoscale zero-valent iron for the removal of dyes from aqueous solution

2011 ◽  
Vol 13 (2) ◽  
pp. 35-39 ◽  
Author(s):  
Junying Zhang ◽  
Qingyang Liu ◽  
Yuanju Ding ◽  
Yiling Bei
Keyword(s):  
Aqueous Solution ◽  
Sorption Kinetics ◽  
Zero Valent Iron ◽  
Nano Particles ◽  
Batch Studies ◽  
Adsorption Capacities ◽  
Nanoscale Zero Valent Iron ◽  
Pseudo Second Order ◽  
Nano Zero Valent Iron ◽  
Order Rate Equation

3-aminopropyltriethoxysilane functionalized nanoscale zero-valent iron for the removal of dyes from aqueous solution Batch studies were conducted to investigate the potential of 3-aminopropyltriethoxysilane modified nano zero-valent iron (APS-NZVI) to adsorb two dyes (acid brilliant scarlet GR and reactive brilliant red K-2BP) from aqueous solution. APS-NZVI showed good adsorption performance for two dyes. Under the adsorption conditions of pH 4.5, initial concentration was 100 mg/L, and time=4h, the maximum adsorption capacities of APS-NZVI were 121.06 mg/g for acid brilliant scarlet GR and 191.5 mg/g for reactive brilliant red K-2BP, respectively. The results revealed that the adsorption behavior of the dyes on the nano-particles fitted well with the Langmuir model and the sorption kinetics fits well the pseudo-second-order rate equation.

scholarly journals Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

2020 ◽  
Author(s):  
Merve Özçelik ◽  
Mustafa CAN ◽  
Mustafa İmamoğlu
Keyword(s):  
Equilibrium Constant ◽  
Thermodynamic Parameters ◽  
Metal Ion ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Polymer Beads ◽  
Pseudo Second Order ◽  
Chlorine Ions ◽  
Ft Ir

Adsorption of gold, and palladium species containing chlorine ions species onto commercial N-{2-[Bis(2-aminoethyl)amino]ethyl}aminomethyl–polystyrene polymer beads (TRIS) were investigated. The influence of the pH, initial metal ion concentration, and contact time on the adsorption performance was examined in a batch adsorption experiment. Langmuir, Modified Langmuir, Freundlich and Freundlich, Dubinin–Radushkevich isotherm model variables are calculated. The Langmuir monolayer adsorption capacities of the Pd (II), and Au (III) chlorine ions species were found to be 204.5, and 168.5 mg/g, respectively. The two metal adsorption kinetics fit the pseudo-second order kinetic models. In thermodynamic calculations, the choice of different equilibrium constant and withal using dimension containing constant usage are an important problem in the field. To overcome these problems, the Modified Langmuir isotherm equilibrium constant is used at determination of thermodynamic parameters. Adsorption mechanism steps were characterized by using FT-IR, SEM, and EDS. The adsorbent is interacted with each metal ions in HCl solution electrostatic interaction and surface complex formation between the amine groups. The calculation of the thermodynamic parameters using the dimensionless modified Langmuir equilibrium constant calculated more satisfying and more reliable way. All thermodynamic parameters suggested that Pd (II) and Au (III) adsorptions onto TRIS beads was a spontaneous, physisorption.

scholarly journals Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

2020 ◽  
Author(s):  
Merve Özçelik ◽  
Mustafa CAN ◽  
Mustafa İmamoğlu
Keyword(s):  
Equilibrium Constant ◽  
Thermodynamic Parameters ◽  
Metal Ion ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Polymer Beads ◽  
Pseudo Second Order ◽  
Chlorine Ions ◽  
Ft Ir

Adsorption of gold, and palladium species containing chlorine ions species onto commercial N-{2-[Bis(2-aminoethyl)amino]ethyl}aminomethyl–polystyrene polymer beads (TRIS) were investigated. The influence of the pH, initial metal ion concentration, and contact time on the adsorption performance was examined in a batch adsorption experiment. Langmuir, Modified Langmuir, Freundlich and Freundlich, Dubinin–Radushkevich isotherm model variables are calculated. The Langmuir monolayer adsorption capacities of the Pd (II), and Au (III) chlorine ions species were found to be 204.5, and 168.5 mg/g, respectively. The two metal adsorption kinetics fit the pseudo-second order kinetic models. In thermodynamic calculations, the choice of different equilibrium constant and withal using dimension containing constant usage are an important problem in the field. To overcome these problems, the Modified Langmuir isotherm equilibrium constant is used at determination of thermodynamic parameters. Adsorption mechanism steps were characterized by using FT-IR, SEM, and EDS. The adsorbent is interacted with each metal ions in HCl solution electrostatic interaction and surface complex formation between the amine groups. The calculation of the thermodynamic parameters using the dimensionless modified Langmuir equilibrium constant calculated more satisfying and more reliable way. All thermodynamic parameters suggested that Pd (II) and Au (III) adsorptions onto TRIS beads was a spontaneous, physisorption.

scholarly journals Removal of Molybdenum(VI) from Raw Water Using Nano Zero-Valent Iron Supported on Activated Carbon

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3162
Author(s):  
Huijie Zhu ◽  
Qiang Huang ◽  
Shuai Fu ◽  
Xiuji Zhang ◽  
Mingyan Shi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fixed Bed ◽  
Zero Valent Iron ◽  
Batch Adsorption ◽  
Raw Water ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Nano Zero Valent Iron ◽  
The Impact ◽  
Harmful Effects

Traces of Molybdenum (Mo) in drinking water pose potent dangers owing to its harmful effects on the health of humans. This study used nanoscale zero-valent iron (Fe0) supported by activated carbon (NZVI/AC) for removing Mo(VI) from raw water. In an attempt to gain an understanding of the various factors that affect the process, we designed the study to look into the impact of various experimental parameters including pH, adsorption kinetics, and coexisting ions on the Mo(VI) removal using fixed-bed column runs and a batch-adsorption method and for Mo(VI) removal using NZVI/AC. The optimum conditions were found to be pH 4.5 and an equilibrium time of 9 h and 72 h for simulation water (SW) and raw water (RW), respectively. The removal of Mo(VI) was remarkably inhibited by the presence of silicate (SiO42−) and phosphate (PO43−), while the impact of humic acid and some other anions was insignificant. Metal cations such as Fe3+, Al3+, Zn2+, and Ni2+ enhanced the adsorption of Mo(VI). The influent contaminant concentration Mo(VI) in raw water was found to be 0.1603 mg/L, the empty-bed contact time (EBCT) was 3 and 6 min, whereas the breakthrough empty-bed volumes were 800 and 1100 and at the value of 70 μg/L provided by WHO provisional guidelines, respectively.

Adsorption of Pb2+ in Wastewater Using Adsorbent Derived from Grapefruit Peel

2011 ◽  
Vol 391-392 ◽  
pp. 968-972 ◽  
Author(s):  
Yuan Yuan Pei ◽  
Jing Yong Liu
Keyword(s):  
Adsorption Kinetics ◽  
Contact Time ◽  
Removal Rate ◽  
Ion Concentration ◽  
Affecting Factors ◽  
Solution Ph ◽  
Isothermal Adsorption ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
Kinetics Of

The adsorbent was prepared from Grapefruit peel by activation with ZnCl2. Grapefruit peel adsorbent (GPA) was employed to be as adsorbent to remove Pb(Ⅱ) in wastewater. The affecting factors on the adsorption of Pb(Ⅱ)from aqueous solution with GPA, such as solution pH, contact time, GPA dosage, initial Pb(Ⅱ) concentration, and reaction temperature were investigated. Adsorption kinetics and adsorption mechanism were investigated also. The results showed that the factors mentioned above have remarkably influence on adsorption of Pb(Ⅱ) ions onto GPA. The suitable conditions for the adsorption conditions were as following: solution pH, 5.3~6.5; contact time, 1.5 hours; GPA dosage, 10 g/L; initial Pb(Ⅱ) ion concentration, 100 mg/L; temperature, 30°C. Under the suitable conditions, the removal rate of Pb(Ⅱ) was more than 90% and the sorption capacities of the GPA for Pb(Ⅱ) were 12.73mg/g. Adsorption kinetics of Pb(Ⅱ) ions onto GPA obeyed pseudo-second-order equation. The isothermal adsorption can be described well by Langmuir, Freundlich and Temkin models, and the Freundlich model was the best.

scholarly journals Heavy metals adsorption from contaminated water using moringa seeds/ olive pomace byproducts

2021 ◽  
Vol 11 (6) ◽  
Author(s):  
Ibrahim Hegazy ◽  
Mohamed E. A. Ali ◽  
Ehab H. Zaghlool ◽  
Ragaa Elsheikh
Keyword(s):  
Heavy Metals ◽  
Agricultural Waste ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Olive Pomace ◽  
Fe And Mn ◽  
Pseudo Second Order ◽  
Seed Husk ◽  
Adsorption Desorption ◽  
Kinetics Of

AbstractSeveral approaches have been used to reduce the accumulation of heavy metals in aqueous solutions, including adsorption to the surface of agricultural waste. Batch studies have been performed in this study to explore the adsorption of Fe2+, Mn2+ on olive pomace (OP), and moringa seed husk (MSH). Fourier transform infrared and scanning electron microscopy also characterized the prepared adsorbent. Batch adsorption studies were performed, and the effects of adsorbent chemical structure, adsorbent dosage, pH, contact time, and initial ion concentration were investigated on Fe and Mn ions sorption and mechanism in order to maximize the removal efficiency of Fe and Mn. It was shown that the removal percentage of Fe2+ and Mn2+ were 83% and 91%, respectively, at optimum pH 5 and optimum time of 120 min at 5 g of OP. Although the removal percentage of Fe2+ and Mn2+ were 80.5% and 93%, respectively, at 5 g of MSH. The pseudo-second-order model was followed by the adsorption kinetics of Fe2+ and Mn2+ on OP and MSH, and the Langmuir model worked well with the adsorption isotherms. Based on their adsorption/desorption processes, OP and MSH adsorbents may be regenerated by DI water more than five times. The overall adsorption power of the OP adsorbent for Fe2+ and Mn2+ was 10.406 and 10.460 mg/g, and the MSH was 10.28 and 11.641 mg/g for Fe2+ and Mn2+, respectively.

Sign in / Sign up

Export Citation Format

Share Document