Rigid amine-incorporated silica aerogel for highly efficient CO2 capture and heavy metal removal

Choi, Haryeong; Han, Hyug Hee; Parale, Vinayak G.; Kim, Taehee; Park, Wanje; Kim, Younghun; Kim, Jiseung; Choi, Yujin; Bae, Youn-Sang; Park, Hyung-Ho

doi:10.1016/j.cej.2024.149357

Cited by 8 publications

(2 citation statements)

References 107 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To ensure the safety of relevant personnel in complex temperature environments, higher performance of protective clothing is required with the advancement in cutting-edge industries including aerospace, metallurgy, firefighting, and other thermo-related fields. − From the performance point of view, besides the basic properties of the matrix, the structure of protective materials also poses a great impact on the protective efficiency. As such, aerogels have emerged as good candidates for thermal insulation, , adsorption, , protection, , and electronic device applications due to their high porosity, large surface area, small density, and low thermal conductivity. The processing of aramid fiber with aerogel structure has thus held great potential to acquire novel fibrous materials featuring lightweight, high-/low-temperature resistance, and flame retardancy for wearable protective applications. , …”

Section: Introductionmentioning

confidence: 99%

Strong, Tough, and Recyclable Aramid Aerogel Fibers with Homogeneous Nanoscale Structures for High-Temperature Thermal Insulation Applications

Zhang,

Liu,

Huang

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Aramid aerogel fibers (AAFs) have attracted tremendous attention recently because of their lightweight, temperature resistance, and flame retarding characteristics, which hold great promise in wearable thermal insulation applications. However, there is still a lack of an efficient method for the fabrication of high-performance AAFs with homogeneous nanoscale structures and optimized thermal/mechanical properties. This paper reports a scalable approach for the continuous spinning of heterocyclic AAFs (HAAFs) by the combination of the "ropes bind rods" reinforcement concept and the "redox responsive sol−gel transition" strategy. The redox reaction responsiveness of the coordination property between cobalt ions and benzimidazole ligand contained in heterocyclic aramid (PABI) is exploited as triggering for sol−gel transition in the spinning process, where the highly dynamic PABI/Co 2+ complex in spinning dope rapidly converts into a highly stable PABI/Co 3+ complex upon extruding into an oxidation bath and forms gel fibers. Incorporating a small amount of flexible benzimidazole-containing polymer further promotes the gelation of PABI/Co 2+ system and strengthens the PABI/Co 3+ cross-linked networks on the basis of a "ropes bind rods" concept on the nanoscale level, which ensures the continuous spinning of HAAFs. The resultant HAAFs demonstrated a homogeneous nanoscale porous structure thanks to the in situ constructed cross-linked networks that prevent the gel skeleton from distortion in subsequent treatment. As a result, the HAAFs show mechanical strength among the highest reported values for AAFs and excellent toughness that is superior to all previous AAFs. The AAFs also exhibit good thermal stability and flame retardancy for thermal insulation applications. The recyclability of HAAFs is finally demonstrated based on the reversible feature of metal coordination bonds. This work is expected to provide an efficient strategy for the design and scalable fabrication of aramid and other high-performance aerogel fibers.

show abstract

Section: Introductionmentioning

confidence: 99%

Strong, Tough, and Recyclable Aramid Aerogel Fibers with Homogeneous Nanoscale Structures for High-Temperature Thermal Insulation Applications

Zhang,

Liu,

Huang

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…Silica aerogel, a class of porous materials, has been widely used in many application fields due to its pore system, lightweight, physicochemical stability, efficient thermal insulation, and eco-friendlines. − Besides, aerogel materials with pore gradient structures have been demonstrated to show superior properties than those porous materials with uniform pore size . In our previous work, a hierarchical pore-gradient silica aerogel (HPSA) which consists of large-pore at top regions and small-pore at bottom regions as well as porous wall assembled by mesoporous silica nanoparticles was constructed via a modified reported fabrication approach, and its utilization in solar-driven water evaporation was explored.…”

Section: Introductionmentioning

confidence: 99%

Electricity Harvesting from Water Evaporation on Hierarchical Pore Gradient Silica Aerogel-Based Generators

Tian,

Chang,

Liu

et al. 2024

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In this study, the electric energy harvesting capability of the hierarchical pore gradient silica aerogel (HPSA) is demonstrated due to its unique porous structure and inherent hydroxyl groups on the surface. Taking advantage of the positively charged surface of unwashed HPSA credited by the preparation strategy, poly(4-styrene sulfonic acid) (PSS) can be spontaneously adsorbed onto unwashed HPSA and shows gradient distribution due to the pore-gradient structure of HPSA. By virtue of the gradient distribution and the stronger ionization of PSS, PSS-modified HPSA (PSS−HPSA) shows enhanced electricity generation performance from natural water evaporation with an average output voltage of 0.77 V on an individual device. The water evaporation-induced electricity property of PSS−HPSA can be maintained in the presence of a low concentration of salt. The desirable salt resistance capability benefits from the unique 3D hierarchical porous structure of HPSA which ensures rapid water replenishment so as to effectively avoid the salt accumulation. The HPSA-based devices with the advantages of unique porous structure, easy functionalization, good physicochemical stability, good salt resistance capability, and eco-friendliness show great potential as water evaporation-induced electricity generators.

show abstract

Statistical modeling and optimization of heavy metals (Pb and Cd) adsorption from aqueous solution by synthesis of Fe3O4/SiO2/PAM: isotherm, kinetics, and thermodynamic

Osman,

Uğurlu,

Vaizoğullar

et al. 2024

Polym. Bull.

View full text Add to dashboard Cite

In this study, magnetic material was synthesized using iron salts, then silicon-specific material was used to gain porosity, straight-chain polyacrylamide (PAM) was modified to give the surface functional properties, and the final product synthesized Fe3O4/SiO2/PAM nanocomposite material. Heavy metal (Pb and Cd) removal studies were carried out with the synthesized composite material, considering the central composite design and response surface methodology (CCD-RSM) optimization model. The effects of various parameters, for example, the initial concentration, pH, adsorbent dose, temperature and contact time, were investigated as a part of this study. To optimize these parameters, the CCD-RSM model was applied to design the experiments. Analysis of variance (ANOVA) was applied to evaluate statistical parameters and investigate interactions of variables. In the designed experimental set, the amount of adsorbent (30 mg), pH 7.0 value, temperature (40 °C), initial concentration of Pb (80 mg/L) and Cd (20 mg/L) and 90 min contact time were determined as the optimum conditions. The high coefficient of determination of both metals showed good agreement between experimental results and predicted values (R2 0.99; 0.95). TEM, SEM, XRD, FTIR, BET and Zeta potential analyses were performed to characterize the structure and morphology of the adsorbent. In Pb2+ and Cd2+ heavy metal removal studies, maximum adsorption capacities were determined as 66.54 and 13.22 mg/g, respectively. Additionally, adsorption isotherms, adsorption kinetics and thermodynamic modeling studies were conducted. Features such as large surface area and high adsorption capacity of the synthesized nanoparticles were observed. In this study, Fe3O4/SiO2/PAM demonstrated its potential as an effective adsorbent for the removal of heavy metal ions present in simulated wastewater samples. In particular, we can say that the material has a strong selectivity, as well as a high affinity for Pb(II) ions.

show abstract

Rigid amine-incorporated silica aerogel for highly efficient CO2 capture and heavy metal removal

Cited by 8 publications

References 107 publications

Strong, Tough, and Recyclable Aramid Aerogel Fibers with Homogeneous Nanoscale Structures for High-Temperature Thermal Insulation Applications

Strong, Tough, and Recyclable Aramid Aerogel Fibers with Homogeneous Nanoscale Structures for High-Temperature Thermal Insulation Applications

Electricity Harvesting from Water Evaporation on Hierarchical Pore Gradient Silica Aerogel-Based Generators

Statistical modeling and optimization of heavy metals (Pb and Cd) adsorption from aqueous solution by synthesis of Fe3O4/SiO2/PAM: isotherm, kinetics, and thermodynamic

Contact Info

Product

Resources

About