Showing papers on "Langmuir published in 2019"
TL;DR: In this paper, a 2-amino-5-guanidinopentanoic acid modified activated carbon (AGDPA@AC) was developed for the effective removal of methylene blue (MB) dye from aqueous medium.
339 citations
TL;DR: In this article, the effect of the experimental conditions (pH, initial concentration (Co), surfactant loading, etc.) on the adsorption capacity is also appraised.
327 citations
TL;DR: The established adsorption method is appropriate for advertisersorption of fenuron pesticide in waters and is speedy, cost‐effective, efficient and repeatable.
271 citations
TL;DR: Graphene and graphene oxide composites have been used for wastewater purification because of their adsorption, oxidation, and catalytic properties as mentioned in this paper, and their composites naturally have significant pore volume, high conductivity, rich surface chemistry, and an exceptionally large aspect ratio.
Abstract: Graphene, graphene oxide (GO), and their composites have been prominently utilized for wastewater purification because of their adsorption, oxidation, and catalytic properties. Graphene and GO and its composites naturally have significant pore volume, high conductivity, rich surface chemistry, and an exceptionally large aspect ratio which make it favorable for adsorption and catalysis of organic pollutants from wastewater. The sheet-like, resonating, polyaromatic π-system of graphene subsidiaries play a significant role in π–π interactions, hydrogen bonding, and/or electrostatic interactions with organic pollutants that include dyes, pharmaceutical waste, and agricultural and industrial effluents whose base structure consists of notably reactive unsaturated aromatic rings and oxygen-rich functional groups. The adsorption capacities of pollutants have been widely researched and catalogued by considering the adsorption isotherm (Langmuir, Freundlich, Temkin, DR model) they fit, the kinetic models (pseudo-fi...
228 citations
TL;DR: The conjugate adsorbent (CJA) was fabricated by functional ligand embedded onto the highly porous silica material for selective lead (Pb(II) ion monitoring and removal from wastewater and demonstrated the potential low-cost material for competitive use in wastewater remediation, especially in the developing countries.
225 citations
TL;DR: The nanofibers membranes fabricated by poly(vinyl alcohol)/chitosan (PVA/Chi) using an electro-spun technique for selective and high adsorption of lead and cadmium ions based on the solution acidity are considered to be effective and promising materials for Pb( II) and Cd(II) ions from wastewaters with high efficiency.
203 citations
TL;DR: In this article, mesoporous carbonated nanoparticles were synthesized by sol-gel route using a complex [Ti(OH2)6]3+·3Cl− and a modifying agent Na2CO3 and used as an adsorbents for Sr(II) removal from aqueous medium.
199 citations
TL;DR: The Langmuir adsorption model captures the key physics of molecular interactions at interfaces and laid the foundation for further progress in understanding interfacial phenomena, developing new adsorbent materials, and designing engineering processes.
Abstract: The 100th anniversary of Langmuir’s theory of adsorption is a significant landmark for the physical chemistry and chemical engineering communities. Despite its simplicity, the Langmuir adsorption model captures the key physics of molecular interactions at interfaces and laid the foundation for further progress in understanding interfacial phenomena, developing new adsorbent materials, and designing engineering processes. The Langmuir model has had an exceptional impact on diverse fields within the chemical sciences (ranging from chemical biology to materials science), an impact that became clearer with the development of modified adsorption theories and continues to be relevant today.
199 citations
TL;DR: In this paper, a batch equilibrium system has been used to investigate the adsorption of methyl orange (MO) on NiO and CuO nanoparticles (NPs), and the effects of experimental conditions such as initial concentration, agitation time, solution pH and temperature were examined.
176 citations
TL;DR: In this paper, the effect of synthetic conditions (e.g., different linkers and activation temperatures) and adsorptive conditions on DCF removal was examined, and the adsorption of diclofenac (DCF) was shown to be endothermic and almost not affected by pH in the range of 4.8-7.7.
175 citations
TL;DR: In this paper, the authors used the biomass of Scenedesmus sp. as an adsorbent for the removal of hexavalent chromium or Cr(VI) from solution.
TL;DR: Results manifested that the UiO-66-DMTD was a latent adsorbent for the efficient and selective removal of Hg(II) in wastewater.
TL;DR: The present study demonstrated the promise of biochar-CMC-nZVI composite as a low-cost, "green", and effective sorbent for removal of Cr(VI) in the environment.
TL;DR: In this paper, the applicability and accuracy of four linearization methods of the Langmuir isotherm (equilibrium adsorbate concentration (Ce)/equilibrium adaption capacity (qe)-Ce, 1/qe-1/ce, qe-qe/ ce and qe/Ce-ce) in parameter estimations by linear least squares regression (LSR) were compared.
TL;DR: In this article, highperformance nitrogen-doped porous carbon adsorbents were prepared from waste cellulose fibers using the spray-drying method and used to remove methyl orange (MO) from water.
TL;DR: It is shown that carbon nanotube-based adsorbents with magnetic and non-magnetic property were of high adsorption performance for the removal of DQ from water and could be promising adsorbent materials for the efficient removal of herbicides from wastewaters.
TL;DR: In this paper, the equilibrium adsorption and kinetics of an anionic surfactant synthesized from soap-nut fruit on sandstone, carbonate and bentonite clay as representative of reservoir rocks were investigated by FE-SEM, XRD and BET surface area analysis.
TL;DR: In this article, the Mn-doped UiO-66 with cubic morphology was fabricated with a facile solvothermal method to investigate the adsorption performance of Mn-o-66, tetracycline (TC) and Cr(VI) were chosen as the target pollutant.
TL;DR: In this article, the applicability of Fe-BDC metal organic framework for the removal of the toxic dye methylene blue from industrial waste was assessed by investigating factors such as effect of contact time, concentration of the dye, amount of adsorbents, and temperature.
TL;DR: The phosphate adsorbed CaO-biochar composites can be directly applied as a slow-release fertilizer to farmland soil, which have the functions of improving soil physical structure, increasing soil fertility, and regulating soil pH.
TL;DR: In this article, the kinetic and equilibrium parameters of the quantitative adsorption for Indigo Carmine (IC) removed by commercial activated carbon (AC) were studied by UV-visible absorption spectroscopy.
TL;DR: The results indicate that SWBC is efficient for MB adsorption and could be a potential adsorbent for wastewater treatment.
TL;DR: It was demonstrated that the fairly cheap and environmentally friendly FexCo3-xO4 nanoparticles have a strong adsorption and removal ability for dyes and are easy to recycle.
TL;DR: In this article, the equilibrium and kinetics of the adsorption of carbamazepine (Cbz) and sildenafil citrate (Sil) onto powdered activated carbon are presented.
TL;DR: In this paper, the authors describe the synthesis of cobalt-oxide nanoparticles by simple precipitation technique and their environmental application, and the nano-adsorbent displayed its efficiency in methyl orange removal from aqueous solution.
TL;DR: In this paper, four types of commercial activated carbon were selected to study their MG adsorption performances systematically, such as adsorship contact time, equilibrium MG adorption capacities, Langmuir and modified Langmuirus equations fitting, adsorithmodynamics and effect of pH.
TL;DR: In this paper, the sorption efficacy of chitosan (β-(1→4)-linked d-glucosamine and N-acetyl-d-gluosamine composite for synthetic direct Rose FRN dye removal from aqueous media was investigated.
Abstract: In the present study, sorption efficacy of chitosan (β-(1→4)-linked d -glucosamine and N-acetyl- d -glucosamine) composite for synthetic direct Rose FRN dye removal from aqueous media was investigated. Chitosan and clay were subjected to chemical modifications to prepare chitosan/clay composite. Batch sorption affecting parameters like pH, composite dose, volume, initial dye concentration, time and temperature were optimized. Maximum sorption capacity (17.18 mg/g) was found within first 40 min of contact. Point of zero charge was found to be 7.0. Linearized and non-linearized regression forms of pseudo 1st and 2nd order kinetic models were used to predict the nature of rate limiting steps involved in the sorption process. Sorption equilibrium data was revealed by applying linear and non-linear equilibrium Langmuir, Freundlich and Redlich–Peterson isotherm models. Calculated values of thermodynamic factors showed that sorption process is exothermic, spontaneous and feasible. Desorption studies were performed for the regeneration of chitosan/clay composite by using different eluting agents. The synthesized composite were characterized by X-ray diffraction (XRD), surface analysis (Brunauer, Emmett and Teller: BET), scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The developed method was also applied on the real textile effluent for the efficient removal of dyes.
TL;DR: In this paper, a synthesized silicate porous material (SPM) was characterized by X-ray diffraction (XRD), Brunner-Emmet-Teller (BET), and scanning electron microscope (SEM).
Abstract: Tailings generated from mineral processing have attracted worldwide concerns due to creating serious environmental pollution. In this work, porous adsorbents were prepared as a porous block by using silicate tailings, which can adsorb heavy metal ions from the solution and are easy to separate. The synthesized silicate porous material (SPM) was characterized by X-ray diffraction (XRD), Brunner–Emmet–Teller (BET), and scanning electron microscope (SEM). The material presented a surface area of 3.40 m2⸱g−1, a porosity of 54%, and the compressive strength of 0.6 MPa. The maximum adsorption capacities of Pb2+, Cd2+, and Cu2+ by SPM were 44.83 mg·g−1, 35.36 mg·g−1, and 32.26 mg·g−1, respectively. The experimental data were fitted well by the Freundlich and Langmuir adsorption models. The kinetics of the adsorption process were fitted well by the pseudo-first order kinetic equation. These results show that the porous materials prepared with silicate tailings could act as an effective and low-cost adsorbent for the removal of heavy metal ions from wastewater. This study may provide a new thought on the high-value utilization of tailing for alleviating environmental pressure.
TL;DR: A H3PO4-modified biochar (CFCP) was prepared using chicken feather and applied to Cd2+ and Pb2+ adsorption, and the pseudo-second-order model and the Langmuir and Freundlich isotherm could better describe the Cd 2+ andPb2+, respectively.
TL;DR: In this paper, the application of single and mixed pillared clays in adsorption of inorganic pollutant in the water: the cadmium, the cobalt, and the copper.