scholarly journals Cu(I) removal using mesoporous silica (UGM-triamin)

2021 ◽  
pp. 1-7
Author(s):  
Mercedes SALAZAR-HERNÁNDEZ ◽  
Enrique ELORZA-RODRÍGUEZ ◽  
Juan Manuel MENDOZA-MIRANDA ◽  
Lucia G. ALVARADO-MONTALVO
Keyword(s):  
Mesoporous Silica ◽  
Adsorption Capacity ◽  
Concentration Ratio ◽  
Porous Silica ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Free Cyanide ◽  
Real Solutions ◽  
Silica Materials

This paper shows the syntheses and use of hybrid porous silica materials (UGM-triamin) in the adsorption of Cu (I) of the cyanidation effluents of gold and silver. Studies of adsorption of Cu (I) in synthetic solutions of Cu-CN a pH of 11 and at a concentration ratio of 1: 5 Cu: CN, simulating the effluents of cyanide process gold and silver ores, showed maximum adsorption capacity of 7.54 mg of Cu (I) per gram of material and favorable adsorption according to the Langmuir model (RL of 0.31 to 0.41). The evaluation of the adsorption capacity of the material with real solutions of cyanide, showed 95% removal of copper in the effluent cyanide and 68.5% selectivity for the adsorption of copper. It has been observed free cyanide destruction in the system during adsorption of copper, so that the oxidation of free cyanide may be linked to the mechanism of adsorption of copper.

Synthesis of Mesoporous Silica and its Adsorption Properties for Chloride Ions

2019 ◽  
Vol 956 ◽  
pp. 282-293
Author(s):  
Guo Jun Ke ◽  
Tian Shi Liu ◽  
Peng Fei Yang ◽  
Xiao Lin Tang
Keyword(s):  
Mesoporous Silica ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Adsorption Properties ◽  
Adsorption Effect ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Mcm 41

A series of mesoporous silica materials (SBA-15, MCM-41, KIT-6) with different pore structures and properties were synthesized and characterized by means of small angle X-ray scattering, transmission electron microscopy, infrared spectroscopy and nitrogen adsorption-desorption. The adsorption properties of three mesoporous silica materials for chlorine ions in aqueous solution were investigated. The results show that SBA-15, MCM-41 with two-dimensional hexagonal structure has a better adsorption effect on chloride ion than KIT-6 With cubic core structure, and MCM-41 with larger specific surface area and smaller pore size has better adsorption effect on chloride ion than on SBA-15. The specific surface area of MCM-41 is 1036 m2/g, and the The adsorption kinetics accords with the pseudo-second-order kinetic model, and the adsorption isotherm is more consistent with the Langmuir isotherm model. The optimum operating conditions for MCM-41 to adsorb chloride ions are as follows: temperature 55 °C, pH 6, adsorption time 2 h, Cl- concentration 0.01 mol/L (584 mg/L) and adsorbent concentration 1.0 g/L. Under these conditions, the adsorption capacity of MCM-41 to chloride ions is greatly enhanced, and the maximum adsorption capacity is 188.18 mg/g.

Investigation of adsorption capacity of N-carboxymethyl chitosan for Pb(II) ions

2013 ◽  
Vol 68 (8) ◽  
pp. 1873-1879 ◽  
Author(s):  
Chongxia Wang ◽  
Qingping Song ◽  
Jiangang Gao
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Chloroacetic Acid ◽  
Freundlich Isotherm ◽  
Carboxymethyl Chitosan ◽  
Langmuir Model ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
First Order

N-carboxymethyl chitosan (NCMC) was prepared by reacting chitosan (CTS) with chloroacetic acid and characterized by 13C-NMR spectroscopy to confirm that carboxymethylation occurred only in the amino groups. The adsorption properties of CTS, NCMC and O-carboxymethyl chitosan (OCMC) towards Pb(II) ions were evaluated and the order of the adsorption capacity was as follows: NCMC > OCMC > CTS. The effects of initial pH value (2.0–5.5) of the solutions and contact time (5–120 min) on adsorption of Pb(II) were investigated and the kinetic data were evaluated using the pseudo-first-order and pseudo-second-order models. Kinetics study showed that the adsorption process followed second-order kinetics rather than the first-order one. Furthermore, the experimental equilibrium data of Pb(II) on the NCMC were analyzed using the Langmuir and Freundlich isotherm models and the results indicated that the Langmuir model gave a better fit than the Freundlich equation and the maximum adsorption capacity obtained from the Langmuir model was 421.9 mg g−1.

scholarly journals Investigating the efficiency of single-walled and multi-walled carbon nanotubes in removal of penicillin G from aqueous solutions

2018 ◽  
Vol 5 (4) ◽  
pp. 187-196 ◽  
Author(s):  
Soheila Chavoshan ◽  
Maryam Khodadadi ◽  
Negin Nasseh ◽  
Ayat Hossein Panahi ◽  
Aliyeh Hosseinnejad
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Langmuir Model ◽  
Penicillin G ◽  
Maximum Adsorption Capacity ◽  
Initial Concentration ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Kinetics Of

Background: Drugs, especially antibiotics, are one of the serious problems of modern life and the main pollution sources of the environment, especially in the last decade, which are harmful to human health and environment. The aim of this study was to investigate the removal of penicillin G from aqueous solutions using single-walled and multi-walled carbon nanotubes. Methods: In this study, the effect of different parameters including pH (3, 5, 7, 9, and 11), initial concentration of pollutant (50, 100, 150, and 200 mg/l), absorbent dose (0.25, 0.5, 0.75, and 1 g/L), mixing speed (0, 100, 200, and 300 rpm), and temperature (10, 15, 25, 35, 45°C) were investigated. The Langmuir, Freundlich, Temkin, BET, Dubinin-Radushkevich isotherms and adsorption kinetics of the first- and second-order equations were determined. Results: The results showed that the efficiency of single-walled and multi-walled carbon nanotubes in the removal of penicillin G was 68.25% and 56.37%, respectively, and adsorption capacity of the nanotubes was 141 mg/g and 119 mg/g at initial concentration of 50 mg/l and pH=5 with adsorption dose of 0.8 g/L for 105 minutes at 300 rpm and temperature of 10°C from aqueous solutions. Also, it was revealed that the adsorption process had the highest correlation with the Langmuir model and secondorder kinetics, and the maximum adsorption capacity based on Langmuir model was 373.80 mg/g. Conclusion: According to the results, it was found that single-walled and multi-walled carbon nanotubes can be used as effective absorbents in the removal of penicillin G from aqueous solutions.

Study on Electrospun-Membrane-Based Filter to Rapidly Remove Reactive Yellow 2 from Wastewater

2013 ◽  
Vol 726-731 ◽  
pp. 707-711
Author(s):  
Wen Peng Zhang ◽  
Da Yong Wu ◽  
Ya Kun Wang
Keyword(s):  
Electron Microscopy ◽  
Mesoporous Silica ◽  
Adsorption Capacity ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Electrospun Membrane ◽  
Transmission Electron ◽  
Prepared Material

Uniform highly ordered mesoporous silica nanofiber membrane was successfully prepared onto copper mesh via coaxial electrospinning combining with the solvent evaporation and extraction induced surfactant assembly process. After a high temperature treatment and amination, it was employed to remove reactive yellow 2 (RY2) in wastewater showing remarkable adsorption capacity. The maximum adsorption capacity can reach up to 371.7 mg/g. The structural properties of synthesized mesoporous silica were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectrum (FTIR). And the adsorption behavior of prepared material was analyzed through three kinds of isotherm models.

Adsorption of lead using a novel xanthated carboxymethyl chitosan

2013 ◽  
Vol 69 (2) ◽  
pp. 298-304 ◽  
Author(s):  
Qingping Song ◽  
Chongxia Wang ◽  
Ze Zhang ◽  
Jiangang Gao
Keyword(s):  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Carboxymethyl Chitosan ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Visible Spectra ◽  
Initial Ph ◽  
Uv Visible

Adsorption of Pb(II) was studied using a novel xanthated carboxymethyl chitosan (XCC). The XCC was synthesized using the xanthation reaction of N-carboxymethyl chitosan (NCMC). The chemical structure of XCC was characterized by UV–visible spectra. The effects of initial pH value of the solutions, contact time and adsorption isotherms on adsorption of Pb(II) were investigated. Moreover, the possible adsorption mechanism was identified using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The experimental results showed XCC experienced a high adsorption capacity. The adsorption isotherm followed the Langmuir model. The maximum adsorption capacity obtained from the Langmuir model was 520.8 mg/g. Thermodynamic studies revealed a spontaneous and exothermic adsorption process. FTIR and XPS studies showed that the carboxyl groups, nitrogen atoms and sulfur atoms participated in the adsorption of Pb(II).

scholarly journals Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

2020 ◽  
Vol 17 (22) ◽  
pp. 8377
Author(s):  
Yahui Zhou ◽  
Shaobo Liu ◽  
Yunguo Liu ◽  
Xiaofei Tan ◽  
Ni Liu ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
First Order ◽  
Micropore Filling ◽  
Order Kinetic Model ◽  
Pseudo First Order

The occurrence of environmental endocrine disrupting chemicals (EDCs) in aquatic environments has caused extensive concern. Graphene-like magnetic sawdust biochar was synthesized using potassium ferrate (K2FeO4) to make activated sawdust biochar and applied for the removal of 17-estradiol (E2). The characterization showed that the surface morphology of five graphene-like magnetic sawdust biochars prepared with different preparation conditions were quite different. The specific surface area and pore structure increased with the increment of K2FeO4 addition. The results have shown that graphene-like magnetic sawdust biochar (1:1/900 °C) had the best removal on E2. The experimental results indicated that pseudo-first-order kinetic model and the Langmuir model could describe the adsorption process well, in which the equilibrium adsorption capacity (qe,1) of 1:1/900 °C were 59.18 mg·g−1 obtained from pseudo-first-order kinetic model and the maximum adsorption capacity (qmax) of 1:1/900 °C were 133.45 mg·g−1 obtained from Langmuir model at 298K. At the same time, lower temperatures, the presence of humic acid (HA), and the presence of NaCl could be regulated to change the adsorption reaction in order to remove E2. Adsorption capacity was decreased with the increase of solution pH because pH value not only changed the surface charge of graphene-like magnetic sawdust biochar, but also affected the E2 in the water. The possible adsorption mechanism for E2 adsorption on graphene-like magnetic sawdust biochar was multifaceted, involving chemical adsorption and physical absorption, such as H-bonding, π-π interactions, micropore filling effects, and electrostatic interaction. To sum up, graphene-like magnetic sawdust biochar was found to be a promising absorbent for E2 removal from water.

scholarly journals Recent Trends in Morphology-Controlled Synthesis and Application of Mesoporous Silica Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2122
Author(s):  
Nabanita Pal ◽  
Jun-Hyeok Lee ◽  
Eun-Bum Cho
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Porous Silica ◽  
The United States ◽  
Structural Features ◽  
Energy Applications ◽  
Silica Materials

The outstanding journey towards the investigation of mesoporous materials commences with the discovery of high surface area porous silica materials, named MCM-41 (Mobil Composition of Matter-41) according to the inventors’ name Mobile scientists in the United States. Based on a self-assembled supramolecular templating mechanism, the synthesis of mesoporous silica has extended to wide varieties of silica categories along with versatile applications of all these types in many fields. These silica families have some extraordinary structural features, like highly tunable nanoscale sized pore diameter, good Brunauer–Emmett–Teller (BET) surface areas, good flexibility to accommodate different organic and inorganic functional groups, metals etc., onto their surface. As a consequence, thousands of scientists and researchers throughout the world have reported numerous silica materials in the form of published articles, communication, reviews, etc. Beside this, attention is also given to the morphology-oriented synthesis of silica nanoparticles and their significant effects on the emerging fields of study like catalysis, energy applications, sensing, environmental, and biomedical research. This review highlights a consolidated overview of those morphology-based mesoporous silica particles, emphasizing their syntheses and potential role in many promising fields of research.

Al-promoted increase of surface area and adsorption capacity in ordered mesoporous silica materials with a cubic structure

2011 ◽  
Vol 47 (45) ◽  
pp. 12337 ◽  
Author(s):  
Daniel Carmona ◽  
Francisco Balas ◽  
Álvaro Mayoral ◽  
Rafael Luque ◽  
Esteban P. Urriolabeitia ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Ordered Mesoporous Silica ◽  
Ordered Mesoporous ◽  
Silica Materials ◽  
Mesoporous Silica Materials ◽  
Cubic Structure

Y2O3 functionalized natural palygorskite as an adsorbent for methyl blue removal

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41765-41771 ◽  
Author(s):  
Xi He ◽  
Jianjun Wang ◽  
Zhan Shu ◽  
Aidong Tang ◽  
Huaming Yang
Keyword(s):  
Wastewater Treatment ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Langmuir Model ◽  
Methyl Blue ◽  
Maximum Adsorption Capacity ◽  
Potential Applications

The methyl blue adsorption isotherm on Y2O3/Palygorskite obeys the Langmuir model, with the maximum adsorption capacity greatly enhanced to 1579.06 mg g−1, exhibiting potential applications in wastewater treatment.

Sign in / Sign up

Export Citation Format

Share Document