Adsorption of sulfonamides on biochars derived from waste residues and its mechanism

Yang

et al. 2022

ACS Appl. Nano Mater.

Covalent organic frameworks (COFs) featuring long-range ordered pore size and large specific surface area have been recognized as a fantastic platform for contaminant removal. However, the influence of nanopore size on their adsorption behavior has not been well understood. Herein, three stable β-ketoenamine COFs, i.e., TpPa-1, TpBD, and TpTph, with the same type of linkage but diverse nanopore size were successfully obtained by a salt-mediated crystallization strategy. Their adsorption behavior and interaction mechanisms toward sulfamerazine (SMR) in aqueous solution were studied by adsorption experiments and density functional theory (DFT) calculations. The adsorption kinetics of SMR over COFs followed the order TpPa-1 < TpBD < TpTph, which is consistent with the changing trend of nanopore size, suggesting that a large nanopore is beneficial in boosting mass transfer. However, the maximum adsorption capacities followed the order TpPa-1 (82.9 mg/g) < TpTph (150 mg/g) < TpBD (188 mg/g). Referring to the data of specific surface area and nanopore size of COFs, it can be inferred that the specific surface area of COFs plays a less important role, and pore characteristics might be the dominant factor affecting the adsorption behavior of SMR. Furthermore, DFT results confirmed that SMR can be loaded into the channels of TpPa-1, TpBD, and TpTph due to its small molecule size, and the adsorption interactions are dominated by C–H···π and H-bonding. The different adsorption performance of SMR on TpPa-1, TpBD, and TpTph stems from their different number of adsorption sites and binding energies. These findings demonstrated the feasibility of adjusting the adsorption capacity of COFs by regulating the nanopore sizes, providing possible solutions for tailor-made COFs with superior adsorption performance.

Section: Resultsmentioning

confidence: 99%

“…The solution pH influences the existing form of adsorbent and adsorbate simultaneously, both of which have a great impact on adsorption. 36 Figure S4a shows the adsorption behaviors of COFs toward SMR in the range of pH 4−10. It was found that with the decrease of acidity, the adsorption capacity first increases and then decreases.…”

Section: ■ Introductionmentioning

confidence: 99%

Effects of Nanopore Size on the Adsorption of Sulfamerazine from Aqueous Solution by β-Ketoenamine Covalent Organic Frameworks

Yang

et al. 2022

ACS Appl. Nano Mater.

Energy Science & Engineering

“…Interactions of H-bonding and π-π reactivity between LM, MA, OX, and BC play the key factor in the adsorption process as well as the pore volume and surface area of BC. 44 Fan et al 33 found similar results where the adsorption rate of sulfonamides on sludge-based BCs was rapidly increased in the first reaction 80 min and then slowed down until attaining the sorption equilibrium after a contacting time of 100 min. 33 Figure 3B shows the influence of BC dose on the removal of LM, MA, and OX at pH 7.6 ± 0.3, contact time of 135 min, and initial OX, LM, and MA concentrations of 200, 145, and 100 mg/L, respectively.…”

Section: Adsorption Performance Of the Prepared Bcmentioning

confidence: 66%

“…44 Fan et al 33 found similar results where the adsorption rate of sulfonamides on sludge-based BCs was rapidly increased in the first reaction 80 min and then slowed down until attaining the sorption equilibrium after a contacting time of 100 min. 33 Figure 3B shows the influence of BC dose on the removal of LM, MA, and OX at pH 7.6 ± 0.3, contact time of 135 min, and initial OX, LM, and MA concentrations of 200, 145, and 100 mg/L, respectively. The increase of BC dose from 0.1 to 1.0 g/L improved the removal efficiencies from 6% to 33.5%, 9% to 18%, and 6.2% to 18.6% in the case of OX, MA, and LM, respectively at a contact time of 135 min.…”

Section: Adsorption Performance Of the Prepared Bcmentioning

confidence: 66%

Solar‐light‐driven ZnO/biochar treatment of pesticides contaminated wastewater: A practical and computational study

Samy

Alalm

Ezeldean

et al. 2022

“…In order to prove that Fe/Ni-PG has excellent adsorption performance, the adsorption capacity of this study is compared with previously reported removal of six SAs (Table ). The data show that the adsorption capacity of Fe/Ni-PG is higher than most reported studies. ,,− ,− It is worth mentioning that the adsorption effect of Fe/Ni-PG on the six mixed SAs can be compared with some literature studies on the adsorption of SAs alone (Tables and ). It can be seen that this material is indeed a potential material for the removal of SAs.…”

Section: Results and Discussionmentioning

confidence: 82%

Preparation of Fe/Ni Bimetallic Oxide Porous Graphene Composite Materials for Efficient Adsorption and Removal of Sulfonamides

et al. 2021

An iron−nickel bimetallic oxide porous graphene composite material (Fe/Ni-PG) was prepared by a simple partial combustion method, which can be used to effectively remove sulfonamides (SAs) from an aqueous solution. The adsorption performance of Fe/Ni-PG, Fe-PG, and Ni-PG on six kinds of SAs was compared, and the influence of time, temperature, pH, and initial concentration of SAs on the adsorption behavior of SAs of Fe/Ni-PG in an aqueous solution was studied. The adsorption kinetics and thermodynamics exhibited that the Langmuir model and pseudo-second-order kinetics model can describe the adsorption isotherm and kinetics. The maximum adsorption capacities of sulfadiazine (SD), sulfamerazine (SM), sulfamethazine (SDM), sulfathiazole (STZ), sulfapyridine (SPD), and sulfisoxazole (SIZ) calculated by the Langmuir model were 26.3, 50.3, 42.2, 27.3, 34.5, and 41.7 mg/g, respectively, which exceeded those of most reported adsorbents. In the adsorption process, hydrogen bonding, π−π electron donor−acceptor, electrostatic interaction, and bimetallic synergies play a major role, and the entire adsorption process is spontaneously endothermic. In addition, the material has excellent stability, and the Fe/Ni-PG after desorption is consistent with the raw material. This work provides a favorable way for the removal of SAs in the environment.