Conventional Regeneration Research Articles

Heat and mass transfer simulation of the microwave-assisted toluene desorption for activated carbons regeneration

The low cost and high efficiency of microwave-assisted regeneration render it a viable alternative to conventional regeneration methods. To enhance the regeneration performance, we developed a coupled electromagnetic, heat, and mass transfer model to investigate the heat and mass transfer mechanisms of activated carbon during microwave-assisted regeneration. Simulation results demonstrated that the toluene desorption process is governed by temperature distribution. Changing the input power and flow rate can promote the intensity of hot spots and adjust their distribution, respectively, thereby accelerating toluene desorption, inhibiting readsorption, and promoting regeneration efficiency. Ultimately, controlling the input power and flow rate can flexibly adjust toluene emissions to satisfy the processing demands of desorbed toluene. Taken together, this study provides a comprehensive understanding of the heat and mass transfer mechanisms of microwave-assisted regeneration and insights into adsorbent regeneration.

Simulation analysis of CO2 in-situ enrichment technology of fluidized catalytic cracking regenerator

In a typical refinery, >30% CO2 is emitted from the Fluidized Catalytic Cracking(FCC) regenerator. To realize green and low-carbon production, how to capture CO2 in flue gas with low cost and high efficiency is crucial for the development of FCC. The CO2 in-situ enrichment technology of FCC regenerator was proposed in this paper. The regenerator plays the role of CO2 enricher, and additional carbon capture equipment is no longer required. The viability of this technology was critically discussed. Computational Fluid Dynamics was used to investigate the distribution pattern of the flow hydrodynamics and the pattern of coking reaction. Two extreme cases of CO2 in-situ enrichment technology were compared with conventional regeneration. The CO2 concentration in flue gas and dry flue gas exceeds 85% and 93%, respectively. Parameters such as pressure, superficial gas velocity, and O2 concentration were examined. The optimal operating conditions for new technology were obtained.

Research on solar-driven interfacial evaporation regeneration performance of different solutions for liquid desiccant cooling system

Liquid desiccant cooling systems (LDCS) are promising air-conditioning systems for energy conservation in buildings. However, their development is limited by significant energy waste and low regeneration efficiency. To improve, a solar-driven interfacial evaporation (SDIE) regeneration method is proposed: adopting photothermal materials to locate heat at the regeneration interface can prevent heat loss into the bulk solution and enhance efficiency. The thermal efficiency of the new regeneration method is about 2.5 times that of the conventional regeneration method. The type of desiccant greatly influences the performance of SDIE, but its impact has not been fully studied yet. To select the best desiccant for optimization, different solutions have been investigated with theoretical analysis and experiments. Considering both regeneration performance and economic benefits, the influence of some key parameters has been revealed. The results show that LiBr has the best regeneration performance, but MgCl2 and CaCl2 are more economical. Mixed desiccant could be a better substitute, showing a good balance between performance and cost. It was found that mixing CaCl2 and MgCl2 solutions in an appropriate proportion is a very cost-effective selection. These advances could make LDCS based on SDIE a potential competitor for the future air-conditioning system.

Recovery and regeneration of anode graphite from spent lithium-ion batteries through deep eutectic solvent treatment: Structural characteristics, electrochemical performance and regeneration mechanism

Recovery of graphite from spent lithium-ion batteries (LIBs) as new anode materials in the LIBs after regeneration can not only promote the recycling of spent LIBs, but also help to alleviate its environmental risks. However, the removal of the impurities in spent graphite is unsatisfying and its electrochemical performance need to be further improved when using conventional regeneration methods (such as acid treatment). Herein, we proposed a novel deep eutectic solvent (DES) leaching method to recover and regenerate waste graphite from spent LIBs under mild condition. The result showed that DES leaching could not only effectively remove the impurities in spent graphite, but also restore its crystal structure and morphology. The regenerated graphite obtained by DES treatment (DRG) exhibited a high specific capacity of 449.4 mAh/g for the first cycle at 0.1C and 285.4 mA h/g even after 500 cycles at 1C. In addition, the retention rate and coulombic efficiency of DRG were as high as 96.0 % and 100 %, respectively. These results demonstrated the excellent electrochemical performance of DRG, which was even comparable to that of commercial graphite. The regeneration mechanism of the proposed method was also elucidated. The organic binder was dissolved in DES by forming hydrogen bonds (OH…F and CH…Cl−). The Li coordination complex formed between SEI film and DES contributed to the dissolution of SEI film, and the residual electrolytes were removed based on the similarity-intermiscibility theory. This study provides a facile and green method to accomplish the closed-loop utilization of spent graphite in spent LIBs.

Segmented regeneration of ion exchange resins used for natural organic matter removal

This study investigated the feasibility of using segmented regeneration for ion exchange (IX) resins used for natural organic matter (NOM) removal. For the first part of the study, regeneration batch tests were conducted for resins solely loaded with sulfate (i.e. ResinSulfate) or NOM (i.e. ResinNOM). We found that ResinSulfate can be fully regenerated using a lower brine concentration (40 g NaCl/L vs 100 g NaCl/L) with a much faster desorption rate compared to ResinNOM (time to reach equilibrium: < 3 min vs approximately 60 min). For the second part of the study, resins recovered from a pilot plant were regenerated in bench-scale columns using conventional (2 bed volume (BV) of 80 g NaCl/L) and segmented regeneration strategies (10 g NaCl/L followed by 120 g NaCl/L), and different volumetric ratios between low-concentration brine and high-concentration brine were assessed for segmented regeneration. It was determined that the optimal segmented regeneration, which uses 3 BV of low-concentration brine followed by 0.8 BV of high-concentration brine, achieved an equivalent regeneration efficiency (77 %) to conventional regeneration while reducing salt usage by 21 % and improving the brine use efficiency from 16 % to 21 %.

Graphene oxide enhances thermal stability and microwave absorption/regeneration of a porous polymer

Microwave regeneration of adsorbents offers several advantages over conventional regeneration methods; however, its application for microwave transparent adsorbents such as polymers is challenging. In this study, hypercrosslinked polymer/graphene oxide (GO) nanocomposites with large surface area and enhanced microwave absorption ability were synthesized. Polymers of 4, 4´-bis ((chloromethyl)-1, 1´-biphenyl- benzyl chloride) were hypercrosslinked through the Friedel-Crafts reactions. GO sheets were synthesized through the Hummer’s method. Nanocomposites with different GO contents (1–8 wt%) were synthesized by solution mixing method. Thermogravimetry analysis revealed a large enhancement in the thermal stability of GO-filled nanocomposites compared to pristine polymer. N2 adsorption isotherm analysis showed 7% and 10% reduction in BET surface area and total pore volume of the nanocomposite with 8 wt% GO. Compared to the pristine polymer, the dielectric constant and dielectric loss factor increased from 5 to 17 and 0.05–1.6, respectively, for the nanocomposites with 8 wt% GO. Microwave-assisted desorption of toluene from samples revealed more than 160 ºC and 4 times improvement in the desorption temperature and desorption efficiency, respectively, by addition of 4 wt% GO to the polymer. This study showed the important role of GO addition for efficient microwave-assisted regeneration of polymer adsorbents.

A systematic analysis of the dynamics of microwave- and conventionally-assisted swing adsorption on zeolite 13X and an activated carbon under post-combustion carbon capture conditions

This work presents a detailed parametric experimental work on the feasibility of microwave regeneration of two commercial adsorbents in a dynamic carbon capture swing adsorption system. A synthetic flue gas (15% v/v CO2 in N2) dry or with 15% relative humidity was selected, along with Norit R2020CO2 activated carbon and zeolite 13X. A purpose-modified experimental apparatus was used to compare microwave-assisted and conventional thermal swing regeneration. The impact of operating parameters on the dynamic process performance was measured for microwave and conventional heating. Parameters considered were type of adsorbent, flue gas composition, quantity of adsorbent (and bed size), and time of full regeneration, on CO2 capture capacity, recovery, purity and desorption kinetics. Results showed that microwave-assisted regeneration presents advantages over its conventional equivalent, as CO2 purity, recovery, and productivity were found to be higher under the former for the two adsorbents studied. For the time needed to achieve 50, 80, 90, and 99% regeneration, the benefits of microwave regeneration over conductive regeneration increased with an increase in sample size. Under the wet gas feed, Norit R2020CO2 and zeolite 13X showed an appreciably higher working capacity with microwave regeneration than with conventional regeneration (39.68 and 24.23% higher, respectively). Under the dry gas feed, the two adsorbents also maintained a higher working capacity with microwave heating as opposed to conductive heating (9.36 and 20.39% higher, respectively). The larger working capacity observed with microwave-assisted regeneration is attributed to the better regeneration.

Conventional regeneration of spent activated carbon from brewer’s spent grain

This work studied conventional regeneration of saturated activated carbon using muffle furnace. The activated carbon was prepared from brewer’s spent grain using carbonization and chemical activation with potassium hydroxide. It was saturated with methylene blue dye and regenerated using muffle furnace. Effect of 30% hydrogen peroxide (H202 ) as an oxidant in the regeneration process was studied. Adsorption – regeneration process was studied for six cycles. Regeneration condition was optimized using central composite design (CCD). Effect of regeneration temperature and time on the adsorptive capacity of regenerated carbon was studied for one cycle. Adsorptive capacity and regeneration efficiency were found to decrease with increase in the number of cycles. 30% H202 had a tremendous effect on the adsorptive capacity of the regenerated carbon. The adsorptive capacity increased as the temperature grew from 200°C to 500°C, but dropped after being raised to 6,000°C. Adsorptive capacity increased from 10 minutes to 30 minutes, but declined to 50 minutes. The Quadratic model was used to regenerate a long network of electronics devices. In this experiment, the parameters were exactly what were required for optimal adsorption: temperature of 537.76 degrees Celsius, time of 29.34 minutes, and an initial dye concentration of 100mg/L with estimated adsorptive capacity of 54.2827mg/L. This was an extremely small mistake of 0.02 percent following validation.

Effects of the heating source on the regeneration performance of different adsorbents under post-combustion carbon capture cyclic operations. A comparative analysis

This work presents a comparative study of microwave and conventional (conductive) heating for adsorbent regeneration. A binary gas mixture representative of pre-dried flue gas from coal-fired power plants (15% v/v CO2 in N2) was passed through a rotatory fixed-bed adsorption column filled with a zeolite molecular sieve (13X) and an activated carbon (NoritR2030CO2). The impact of the two regeneration methods on both the textural properties and the carbon capture performance (CO2 uptake capacity, regeneration efficiency, and rate of regeneration) were assessed and compared after consecutive adsorption/desorption cycles. Overall, NoritR2030CO2 maintained stable adsorption capacity and regeneration efficiency with both conventional and microwave heating but slightly better with the latter. Additionally, power consumption per adsorbent unit mass and per adsorbate removed were reduced with microwave regeneration by 18.69 and 17.76% respectively compared to conventional regeneration. In the case of 13X, adsorption capacity and regeneration efficiency were found to be relatively stable after a drop in the first cycle in both heating modes, whereas power requirement was found higher in microwave regeneration than in conventional regeneration.NoritR2030CO2 showed a slightly higher maximum desorption rate when regenerated with microwave heating compared to conductive heating. Contrarily, the maximum desorption rate for the molecular sieve is higher with conductive heating as opposed to microwave heating. However, the data indicated a bigger desorption rate with the microwave regeneration in both adsorbents in later stages of the heating process (i.e. from min 16th for NoritR2030CO2 and from min 18th for 13X until process completion). The breakthrough time (tb) of NoritR2030CO2 was unaffected by cyclic operation or the heating methods, whereas in 13X this value varied over the cycles. The latter observation indicates that 13X requires either longer times or higher temperatures to achieve full regeneration compared to NoritR2030CO2.It can be concluded that microwave-assisted regeneration presented slight advantages over regeneration with conductive heating in delivering more steady capture capacity and regeneration efficiency for NoritR2030CO2 under the test conditions employed here whereas 13X exhibited indifference.

Application of Ascophyllum nodosum-Based Soluble Extract on Micropropagation and Regeneration of Nicotiana benthamiana and Prunus domestica

In the present study, the effect of a commercial extract of the seaweed Ascophyllum nodosum on in vitro micropropagation, shoot regeneration, and rhizoghenesis were studied in Nicotiana benthamiana and Prunus domestica. Results showed that the MS medium supplemented with various concentrations of the Ascophyllum extract (5, 10, 50, and 100 mg L−1) significantly enhanced the number of regenerated buds from N. benthamiana leaf discs to the conventional MS regenerating medium. Increases ranged from 3.5 to 6.5 times higher than the control. The effect of the Ascophyllum extract on N. benthamiana micropropagation was assessed through the measurement of some plant growth parameters. Results showed that the extract alone could not replace the micropropagation medium since shoot length, shoot diameter, root length, and leaf area were significantly reduced. However, its combination with a half-strength MS medium enhanced these parameters. Its effect was also evaluated on regeneration from plum hypocotyl slices. When added to the shoot regeneration medium without any plant growth regulators, the Ascophyllum extract alone could induce shoot regeneration. However, the percentage of bud regeneration and number of regenerated buds were lower than with the conventional shoot regeneration medium containing complete growth regulators. In contrast, the Ascophyllum extract drastically promoted rhizogenesis from plum hypocotyl slices. These results pave the way for the possible use of A. nodosum extracts in in vitro mass propagation of higher plants.

Comparison of microwave and conventional heating for CO2 desorption from zeolite 13X

This study investigates microwave irradiation as an alternative to conventional heating for temperature swing adsorption processes. The performance of microwave and conventional heating during sorbent regeneration was evaluated by measuring CO2 desorption from zeolite 13X at different temperatures. Experimentally, a fixed bed of zeolite 13X was saturated by a 150 sccm flow of 15 % CO2 at room temperature followed by sorbent regeneration under nitrogen at 55, 100, or 150 °C by applying either microwave irradiation or conventional heating. Microwaves reduced sorbent regeneration times by at least half compared to regeneration by conventional heating. Under conventional regeneration, desorption curves were resolved into two peaks representing physisorbed CO2 (mass diffusion limited) at low temperature and bicoordinated CO2 (thermally limited) with increasing temperature. Under microwave regeneration, only one desorption peak was observed suggesting that CO2 desorption was limited by mass diffusion through the porous zeolite 13X structure, rather than by temperature. Depending on microwave power, apparent activation energy of the microwave-assisted regeneration was 15.8–18.1 kJ/mol, compared to 41.5 kJ/mol for conventional regeneration. The reduction in apparent activation energy is mainly attributed to selective microwave heating of CO2 adsorption sites (Na+ sites) resulting in greater steady state temperatures of Na+ relative to framework atoms, suggesting greater heating efficiency due to microwaves compared to conventional heat transfer. Due to rapid cycling and efficient heat transfer to CO2 sites on zeolite 13X, microwave regeneration is found to increase adsorption/desorption cycling productivity and potentially reduce the energy penalty of temperature swing capture.

Interim reuse in urban derelicts: Uncovering the community's attitudes and preferences through scenario-elicitation

Over the last decades, interim reuse has emerged as a possible solution for vacant land and abandoned spaces in cities. It is presented as an alternative to conventional regeneration projects, opening up new possibilities for the occupation of formerly derelict spaces. However, in addition to such opportunities, it also poses a number of risks which need to be mitigated, calling for new mechanisms that foster the consultation and participation of communities within the scope of urban planning. The present research seeks to fill this gap by introducing scenario-elicitation, an innovative participation methodology, which relies on new visualisation and communication techniques in planning. Application of the methodology to an abandoned industrial lot in Barreiro – a shrinking city in the suburban belt of Lisbon, Portugal – yielded the following conclusions: (i) scenario-elicitation constitutes a potential tool for the consultation of communities, as a complement to other visualisation and communication techniques in planning; (ii) interim reuse is embraced by communities as a useful device to respond to vacancy and urban abandonment situations; (iii) citizens' adherence to types of interim reuse is geared, primarily, towards collective space options linked to healthy living practices and the combination of different functional and spatial assets.

The role of intraparticle diffusion path length during electro-assisted regeneration of ion exchange resins: Implications for selective adsorbent design and reverse osmosis pretreatment

Inorganic membrane scaling is a major cause of process failure for reverse osmosis (RO). Pretreatment using selective ion exchangers can reduce membrane scaling by removing scale-forming ions such as calcium (Ca2+) and phosphate (P). Ca- and P-selective ion exchangers also enable calcium phosphate recovery via precipitation from spent regenerants enriched with both ions. However, conventional regeneration approaches require substantial chemical and energy inputs. In this study, we designed a RO pretreatment process using electro-assisted regeneration of a column train containing a hybrid anion exchanger (HAIX) and a weak acid cation exchanger (WAC) to selectively remove > 90% Ca2+ and P from synthetic secondary effluent. HAIX and WAC were regenerated using pH 11 catholyte and pH 3 anolyte produced via electrochemical water splitting. HAIX contains ferric oxide nanoparticles (FeOnp) in a parent strong base anion exchanger (SBA). By comparing P regeneration efficiency of HAIX and SBA, we identified that FeOnp dopants reduced intraparticle diffusivity by 85% from SBA to HAIX. However, HAIX exhibited faster column regeneration kinetics than SBA, potentially due to the shortened intraparticle diffusion path length caused by the surface-distributed P in saturated HAIX, which overcompensated for low intraparticle diffusivity. Regenerability enhancement caused by the reduced intraparticle diffusion path length was also confirmed by comparing WAC with shallow-shell WAC (SSWAC), which has surface-distributed carboxylate functional groups. We anticipate that this study will inform selective adsorbent design by identifying strategies to improve regenerability, facilitate process intensification by replacing chemical inputs with electricity, and enhance resource recovery from wastewater.

Recycling and Direct-Regeneration of Cathode Materials from Spent Ternary Lithium-Ion Batteries by Hydrometallurgy: Status Quo and Recent Developments

The cathodes of spent ternary lithium-ion batteries (LIBs) are rich in nonferrous metals, such as lithium, nickel, cobalt and manganese, which are important strategic raw materials and also potential sources of environmental pollution. Finding ways to extract these valuable metals cleanly and efficiently from spent cathodes is of great significance for sustainable development of the LIBs industry. In the light of low energy consumption, ‘green’ processing and high recovery efficiency, this paper provides an overview of different recovery technologies to recycle valuable metals from cathode materials of spent ternary LIBs. Development trends and application prospects for different recovery strategies for cathode materials from spent ternary LIBs are also predicted. We conclude that a highly economic recovery system: alkaline solution dissolution/calcination pretreatment → H2SO4 leaching → H2O2 reduction → coprecipitation regeneration of nickel cobalt manganese (NCM) will become the dominant stream for recycling retired NCM batteries. Furthermore, emerging advanced technologies, such as deep eutectic solvents (DESs) extraction and one–step direct regeneration/recovery of NCM cathode materials are preferred methods to substitute conventional regeneration systems in the future.

Seasonal variation characteristics of hydroxyl radical pollution and its potential formation mechanism during the daytime in Lanzhou

Hydroxyl free radicals (OH radicals) play the main role in atmospheric chemistry and their involving reactions are the dominant rate determining step in the formation of secondary fine particulate matter and in the removal of air pollutants from the atmosphere. In this paper, we studied the seasonal variation characteristics of OH radicals during the daytime in Lanzhou and explored the potential formation mechanism of high concentration OH radicals. We found that the OH radicals in four seasons was 2.7 × 106, 2.6 × 106, 3.1 × 106, and 2.2 × 106 cm−3, respectively. Since the rainfall was concentrated in summer, the wet deposition had a significant effect on removing OH radicals. Among the four pollutants (including ozone (O3), volatile organic compounds (VOCs), nitrogen dioxide (NO2) and fine particulate matter (PM2.5)), the variation of OH radicals were closely related to ozone concentration especially in spring and summer. In autumn, the correlation between PM2.5 and OH radicals were the closest among the observing pollutants and its formation mechanism was different conventional regeneration pathway. In Event 1, high concentration of ozone was the main source of OH radicals; under the high humidity condition, except for ozone, the multiple factors including VOCs, NO2 and PM2.5 interplayed and leaded to the Event 2.

Carbon-rich solvent regeneration in solvent-based post-combustion CO2 capture process (PCCC): Process intensification by megasonics

Global greenhouse gas emanations from fossil-fuel combusting for power-generation alone contribute 9.795 gigatonnes (Gt) in 2014. There is a tremendous focus on global carbon capture researchers to cut down these emissions significantly. Chemical absorption is widely used and the use of monoethanolamine (MEA) was generally preferred. However, MEA solutions were not without problems. For example, equipment deterioration due to O2 presence, high energy for solvent-regeneration, solvent degradation and formation of undesired harmful by-products inhibits the solvent's cyclic capacity. To address these issues megasonics-assisted (1 MHz - tank-type) solvent regeneration process had been investigated experimentally. The results revealed that low regeneration temperature (<45 °C), less condenser duty, the potential for sensible heat saving, no reboiler is required facilitates capital and maintenance saving, no significant colour change after regeneration and loss of absorption capacity after regeneration was 3.7 times lower than the conventional. In addition, similar regeneration energy (20.20 KJ/mol CO2) but with 3.5 times lower nominal power input than the conventional regeneration method. Furthermore, physicochemical characterization of the solvent before and after absorption and regeneration followed by 13C NMR spectra analysis was also discussed.

Modeling of the Coldfinger water exhauster for advanced TEG regeneration in natural gas dehydration

The performance of natural gas dehydration using triethylene glycol (TEG) strongly depends on the purity level of TEG in the regeneration unit. Coldfinger is a TEG regeneration technology reported to be capable of increasing TEG purity to levels above 99.8 wt.%, but conceptual models of this equipment appear to be lacking. This work presents a methodology for modeling Coldfinger, where the equipment is represented as two theoretical equilibrium stages operating at different temperatures in the presence of internal vapor recirculation. The key parameters governing the functioning of the equipment are discussed on the basis of a series of simulations carried out for different top temperatures and internal recirculation ratios. The results demonstrate that a regeneration of TEG up to approximately 99.9 wt.% is achievable by injecting smalls amounts of dry gas, considerably lower than conventional enhanced TEG regeneration by gas stripping.

Low-energy-consumption and environmentally friendly CO2 capture via blending alcohols into amine solution

The conventional regeneration processes for aqueous amine-based sorbents require high regeneration temperature and are very energy intensive. In this work, a low-temperature and energy-saving CO2 capture technology has been successfully developed by using alcohols-amines-water mixtures as sorbents. The addition of certain amounts of alcohols [especially ethanol (EtOH)] to amines can significantly increase the CO2 desorption rates and cyclic CO2 capture capacities in comparison with those of monoethanolamine-water, diethanolamine-water, and methyldiethanolamine-water systems. The sorbent containing 40 wt% EtOH, 20 wt% monoethanolamine (MEA), and 20 wt% H2O can increase cyclic CO2 capture capacity by 6.8 times and a maximum improvement of 236 times in CO2 desorption rate at 75 °C, which makes the use of the low-temperature waste heat in power plants for CO2 capture or self-supported CO2 capture in power plants possible. To the best of authors’ knowledge, this is the first time that Raman and Fourier transform infrared spectroscopy characterizations have been used to confirm that ethanol in EtOH-MEA-H2O can change the reaction pathway by forming C2H5OCO2− instead of HCO3−, which is difficult to decompose. In addition, the experimental results confirm that the new technology can significantly avoid amine degradation – a common challenge of the state-of-the-art CO2 capture technologies. Therefore, the new CO2 capture technology is promising from the perspectives of energy saving and environmental protection.

Spent Caustic Regeneration in a Rotating Packed Bed: Reaction and Separation Process Intensification

Regeneration of spent caustic from liquefied petroleum gas sweetening in refineries is significant to save resources and reduce solid waste emissions. Conventional regeneration technologies have been widely used, but these technologies usually have a reactor and a separator in series which occupies a large space. In this work, simultaneous reaction and separation processes were proposed to be conducted in a rotating packed bed (RPB), aiming for the process intensification of spent caustic regeneration. Experimental results of laboratory tests show that the regeneration processes of mercaptide oxidation and disulfide separation were efficiently enhanced in the RPB. The side-line test, treating the actual spent caustic from a refinery, could achieve good performance for a long-time running. An artificial neural network model was applied for parameters analysis and prediction of the regeneration performance. This work demonstrated the feasibility of spent caustic regeneration in only one RPB unit, which disp...

Magnetic Fe3O4@Chitosan Carbon Microbeads: Removal of Doxycycline from Aqueous Solutions through a Fixed Bed via Sequential Adsorption and Heterogeneous Fenton-Like Regeneration

The adsorptive removal of antibiotics from aqueous solutions is recognized as the most suitable approach due to its easy operation, low cost, nontoxic properties, and high efficiency. However, the conventional regeneration of saturated adsorbents is an expensive and time-consuming process in practical wastewater treatment. Herein, a scalable adsorbent of magnetic Fe3O4@chitosan carbon microbeads (MCM) was successfully prepared by embedding Fe3O4 nanoparticles into chitosan hydrogel via an alkali gelation-thermal cracking process. The application of MCM composites for the adsorptive removal of doxycycline (DC) was evaluated using a fixed-bed column. The results showed that pH, initial concentration, flow rate, and bed depth are found to be important factors to control the adsorption capacity of DC. The Thomas and Yoon-Nelson models showed a good agreement with the experimental data and could be applied for the prediction of the fixed-bed column properties and breakthrough curves. More importantly, the saturated fixed bed can be easily recycled by H2O2 which shows excellent reusability for the removal of doxycycline. Thus, the combination of the adsorption advantage of chitosan carbon with catalytic properties of magnetic Fe3O4 nanoparticles might provide a new tool for addressing water treatment challenges.