Study on the Removal Efficiency and Mechanism of Tetracycline in Water Using Biochar and Magnetic Biochar

In this study, a new type of sludge-derived biochar material with high tetracycline removal efficiency, named magnetic Fe3O4 biochar, was accomplished by KOH activated and loaded with magnetic Fe3O4. The particles with spherical pellets observed by SEM, as well as the XRD patterns, indicated that magnetic Fe3O4 nanoparticles were successfully loaded onto the biochar. We studied the adsorption effects and mechanisms of the following three different adsorption materials for tetracycline: biochar (BC), magnetic Fe3O4, and magnetic biochar (MBC), and the loading conditions and reusability of the materials were also considered. The adsorption effects were as follows: Fe3O4 (94.3%) > MBC (88.3%) > BC (65.7%), and the ratio of biochar to ferric salt was 0.2:1; the removal effect reached the best result. Under an acidic condition, the adsorption capacity of all the materials reached the maximum, and the adsorption of tetracycline in water, by three adsorbents, involves chemical adsorption as the leading process and physical adsorption as the auxiliary process. Various characterizations indicated the removal of tetracycline, including pore filling, electrostatic interaction, hydrogen bond action, and cationic-π action. Complex bridging is a unique adsorption mechanism of magnetic Fe3O4 and magnetic biochar. In addition, the magnetic biochar also possesses π–π bond interaction. The magnetic materials can still maintain a certain amount of adsorption capacity on tetracycline after five cycles. This study proved that the magnetic sludge-based biochar are ideal adsorbents for the removal of tetracycline from water, as well as an effective route for the reclamation of waste sludge.

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Improvement of zeolite adsorption capacity for cephalexin by coating with magnetic Fe3O4 nanoparticles

Journal of Molecular Liquids ◽

10.1016/j.molliq.2016.02.092 ◽

2016 ◽

Vol 218 ◽

pp. 615-624 ◽

Cited By ~ 58

Author(s):

Anoushiravan Mohseni-Bandpi ◽

Tariq J. Al-Musawi ◽

Esmail Ghahramani ◽

Mansur Zarrabi ◽

Samira Mohebi ◽

...

Keyword(s):

Adsorption Capacity ◽

Fe3o4 Nanoparticles ◽

Magnetic Fe3o4 Nanoparticles ◽

Magnetic Fe3o4

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Improved Removal of Quinoline from Wastewater Using Coke Powder with Inorganic Ions

Processes ◽

10.3390/pr8020156 ◽

2020 ◽

Vol 8 (2) ◽

pp. 156

Author(s):

Lei Wang ◽

Qieyuan Gao ◽

Zhipeng Li ◽

Yongtian Wang

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Physical Adsorption ◽

Water Film ◽

Inorganic Ions ◽

Ion Concentration ◽

Batch Adsorption ◽

Order Kinetic ◽

Powder Particles ◽

Coke Powder

In this paper, laboratory batch adsorption tests were performed to study the adsorption behavior of coke powder in a quinoline aqueous solution with the absence and presence of inorganic ions (K+ and Ca2+). Adsorption isotherms, thermodynamic parameters, and kinetic models were used to understand the sorption mechanism, and zeta potential measurements were performed to elucidate the effect of the inorganic ions on the adsorption. The results showed that coke powder exhibited a reasonably good adsorption performance due to its pore structure and surface characteristics, and the presence of K+ and Ca2+ could further improve the adsorption. Without inorganic ions, the adsorption capacity of coke powder for quinoline and the removal efficiency of quinoline were 1.27 mg/g and 84.90%, respectively. At the ion concentration of 15 mmol, the adsorption capacity of coke powder and quinoline removal efficiency in the presence of K+ reached 1.38 mg/g and 92.02%, respectively, whereas those in the solutions with Ca2+ reached 1.40 mg/g and 93.31%, respectively. It was found that the adsorption of quinoline onto coke powder in the absence and presence of inorganic ions fit the Freundlich isotherm. Changes in the Gibbs free energy, the heat of adsorption, the entropy, and the activation energy of adsorption suggest that the adsorption was spontaneous and exothermic, which was dominated by physical adsorption, and that the added K+ and Ca2+ would favor the adsorption. In addition, the pseudo-second-order kinetic model was found to provide the best fit to the adsorption kinetic data, and K+ and Ca2+ increased the rate of quinoline adsorbed onto coke power. This improved adsorption due to inorganic ions was found to be a consequence of the decrease in the surface potential of coke powder particles, which resulted in a reduced thickness of water film around particles, as well as a decreased electrostatic repulsion between coke powder particles and quinoline molecules.

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Comparative Experiment Study on the Total Phosphorus Removal Efficiency of Different Infiltration Media Combinations in the CRI System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.415-417.1735 ◽

2011 ◽

Vol 415-417 ◽

pp. 1735-1739 ◽

Cited By ~ 1

Author(s):

Jun Min Chen

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Total Phosphorus ◽

Phosphorus Removal ◽

Sponge Iron ◽

Experimental Results ◽

National Standard ◽

Phosphorus Adsorption ◽

New Type ◽

Better Than

The total phosphorus removal efficiency is very low and the TP concentration of the effluent can not reach the national standard of GB18918-2002 in CRI system. In order to solve these problems, a series of comparative experiments on phosphorus adsorption capacity of 5 kinds of special infiltration media are carried out. And then another series of comparative experiments on the total phosphorus removal efficiency of 4 kinds of infiltration media combinations are also conducted, the experimental results show that the phosphorus adsorption capacity of sponge iron is the best one among the special infiltration media selected；the phosphorus removal efficiency of the infiltration media including 1/6 sponge iron is much better than the infiltration media including only sand; and the phosphorus removal efficiency of the infiltration media combination with sponge iron homogeneously mixed with sand, is better than the infiltration media combination with the same weight of sponge iron concentrated. The experimental results will help to explore the development of the new type composite infiltration media of the CRI System.

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Magnetic Fe3O4 nanoparticles for adsorptive removal of acid dye (new coccine) from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2010.310 ◽

2010 ◽

Vol 62 (4) ◽

pp. 844-851 ◽

Cited By ~ 24

Author(s):

Chih-Huang Weng ◽

Yao-Tung Lin ◽

Chia-Ling Yeh ◽

Y. C. Sharma

Keyword(s):

Ionic Strength ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Fe3o4 Nanoparticles ◽

Average Particle Size ◽

Precipitation Method ◽

Maximum Adsorption Capacity ◽

Average Particle ◽

Magnetic Fe3o4 Nanoparticles ◽

Magnetic Fe3o4

The ability of magnetic Fe3O4 nanoparticles (MFN) to remove new coccine (NC), an acidic dye, from aqueous solutions was studied. Parameters including ionic strength, pH, and temperature were evaluated. MFN, prepared by precipitation method, exhibits an average particle size of 12.5 nm, specific surface area of 85.5 m2/g, and pHzpc of 5.9. Results of kinetic adsorption experiments indicated that the pseudo-second-order rate of adsorption increased with increasing initial NC concentration. Findings also revealed that the equilibrium data could be fitted into Langmuir adsorption isotherm. The adsorption is favored at low pH, high temperature, and low ionic strength, whereupon a maximum adsorption capacity of 1.11 × 10−4 mol/g was determined for NC. Thermodynamic functions indicated that the adsorption process is spontaneous and exothermic in nature. Tests of regeneration showed that after 5 regeneration cycles the adsorption capacity of NC decreased to 35% to its original capacity.

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Specifically designed magnetic biochar from waste wood for arsenic removal

Sustainable Environment Research ◽

10.1186/s42834-021-00100-z ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Chih-Kuei Chen ◽

Jia-Jia Chen ◽

Nhat-Thien Nguyen ◽

Thuy-Trang Le ◽

Nguyen-Cong Nguyen ◽

...

Keyword(s):

Adsorption Capacity ◽

Arsenic Removal ◽

Physical Adsorption ◽

Adsorption Method ◽

Waste Wood ◽

Processing Technologies ◽

Magnetic Biochar ◽

X Ray ◽

Modified Biochar ◽

Operation Conditions

AbstractArsenic is a carcinogenic substance, with many cases of poisoning related to arsenic pollution in groundwater. In Taiwan arsenic in groundwater caused the notorious Blackfoot disease. Methods for arsenic removal from water include precipitation, membrane processes, ion exchange, and adsorption, but these processing technologies suffer from high investment costs and complex operations. The traditional adsorption method cannot be used for arsenic removal due to its high operating costs, difficulties in recovery, and low adsorption capacity. To address these issues, this study designed an adsorption material based on biochar for arsenic removal with higher adsorption properties and easy recovery. Biochar sources are readily available from waste wood as a cheap and environmentally friendly material. The efficiency of As (III) removal is also promoted by FeCl3 and KMnO4. The objectives of this research are to obtain optimum operation conditions by assessing the effects of different iron and manganese contents, different doses, different pH and different initial concentration. The adsorption mechanism between As (III) and biochar was studied by adsorption isotherms and the kinetic model. X-ray diffraction, energy-dispersive X-ray spectroscopy and elemental analyzer analysis results show that modified biochar has major elements of Fe and Mn. There is greater magnetism, 40 emu g− 1, in the modified biochar. The maximum adsorption efficiency of 81% and 0.72 mg g− 1 capacity occurs when the ratio of Mn, Fe and C is 4:1:1. The adsorption capacity is high under higher pH with pristine biochar and 1FeC under lower pH with 1Fe2MnC. The reaction mechanism is divided into four pathways. The first pathway is the attachment of As (III) ions into the pore of biochar via physical adsorption. In the second pathway, biochar can connect with As (III) through hydrogen bonding from the function group -OH in the biochar and the As (III) itself. In the third pathway, they can contact each other by electron force when the biochar surface is filled with a positive charge. In the fourth pathway, the compounds of manganese have strong oxidizability to oxidize As (III) to As(V). The iron ions then act as a bridge connecting the biochar and the As (III), resulting in the formation of new complex compounds.

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Synthesis and Characterization of Magnetic Fe3O4/Zeolite NaA Nanocomposite for the Adsorption Removal of Methylene Blue Potential in Wastewater Treatment

Journal of Chemistry ◽

10.1155/2021/6678588 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Ngoc Bich Thi Tran ◽

Ngoc Bich Duong ◽

Ngoc Long Le

Keyword(s):

Methylene Blue ◽

Wastewater Treatment ◽

Adsorption Capacity ◽

Removal Efficiency ◽

Fe3o4 Nanoparticles ◽

Synthesis Process ◽

X Ray ◽

Adsorption Removal ◽

Zeolite Naa ◽

Magnetic Fe3o4

In this research, the magnetic Fe3O4/zeolite NaA nanocomposite (Fe3O4/ZA), Fe3O4 nanoparticles, and zeolite NaA have been synthesized by facile hydrothermal methods for adsorption removal of methylene blue from aqueous solution. The as-synthesized Fe3O4/ZA nanocomposite was characterized by X-ray diffraction (XRD), MicroRaman analysis, Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray fluorescence (XRF), N2 adsorption isotherms (BET), and UV-VIS analysis. The results show that with a small weight loading of Fe3O4, the ∼3.3% Fe3O4/ZA sample exhibits a high adsorption capacity (∼40.36 mg·g−1) and removal efficiency (∼96.8%) compared to that of the zeolite NaA (∼32.99 mg·g−1 and 79.11%, respectively). Interestingly, the removal efficiency and the adsorption capacity increase rapidly with the increase of adsorption time (10–60 minutes) and Fe3O4 loading (∼3.3–9.3% wt.) in the Fe3O4/ZA composition. The adsorption mechanism of MB molecules of the Fe3O4/ZA can be addressed at the combination of the interaction between active sites on the surfaces and edges of the invert spinel ferrite Fe3O4 nanoparticles and zeolite NaA with MB molecules. Our approach provides a simple, efficient, and scalable synthesis process that render practical applications of the magnetic Fe3O4/ZA nanocomposite as a lower-cost adsorbent for wastewater treatment.

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Magnetic Fe3O4 Nanoparticles: Synthesis and Application in Water Treatment

Nanoscience & Nanotechnology-Asia ◽

10.2174/2210682011101010014 ◽

2012 ◽

Vol 1 (1) ◽

pp. 14-24 ◽

Cited By ~ 13

Author(s):

Xue-Mei Li ◽

Gaojie Xu ◽

Yue Liu ◽

Tao He

Keyword(s):

Water Treatment ◽

Fe3o4 Nanoparticles ◽

Nanoparticles Synthesis ◽

Magnetic Fe3o4 Nanoparticles ◽

Magnetic Fe3o4

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Adsorption and Catalysis of Orange II from Wastewater by Inorganic-Organic-Bentonite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.340.236 ◽

2011 ◽

Vol 340 ◽

pp. 236-240

Author(s):

Jian Feng Ma ◽

Jian Ming Yu ◽

Bing Ying Cui ◽

Ding Long Li ◽

Juan Dai

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Dye Removal ◽

Maximum Adsorption Capacity ◽

Orange Ii ◽

Acid Dye ◽

Secondary Pollution ◽

Organic Bentonite ◽

Maximum Removal

Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.

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Pristine and Magnetic Kenaf Fiber Biochar for Cd2+ Adsorption from Aqueous Solution

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18157949 ◽

2021 ◽

Vol 18 (15) ◽

pp. 7949

Author(s):

Anwar Ameen Hezam Saeed ◽

Noorfidza Yub Harun ◽

Suriati Sufian ◽

Muhammad Roil Bilad ◽

Zaki Yamani Zakaria ◽

...

Keyword(s):

Adsorption Capacity ◽

Photoelectron Spectroscopy ◽

Textural Properties ◽

Ion Concentration ◽

Solution Temperature ◽

Maximum Adsorption Capacity ◽

Magnetic Biochar ◽

X Ray ◽

Study Results ◽

Capacity Surface

Development of strategies for removing heavy metals from aquatic environments is in high demand. Cadmium is one of the most dangerous metals in the environment, even under extremely low quantities. In this study, kenaf and magnetic biochar composite were prepared for the adsorption of Cd2+. The synthesized biochar was characterized using (a vibrating-sample magnetometer VSM), Scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The adsorption batch study was carried out to investigate the influence of pH, kinetics, isotherm, and thermodynamics on Cd2+ adsorption. The characterization results demonstrated that the biochar contained iron particles that help in improving the textural properties (i.e., surface area and pore volume), increasing the number of oxygen-containing groups, and forming inner-sphere complexes with oxygen-containing groups. The adsorption study results show that optimum adsorption was achieved under pH 5–6. An increase in initial ion concentration and solution temperature resulted in increased adsorption capacity. Surface modification of biochar using iron oxide for imposing magnetic property allowed for easy separation by external magnet and regeneration. The magnetic biochar composite also showed a higher affinity to Cd2+ than the pristine biochar. The adsorption data fit well with the pseudo-second-order and the Langmuir isotherm, with the maximum adsorption capacity of 47.90 mg/g.

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