Adsorption Properties Graphene-Based Composites on Lead(II) Ions

2021 ◽  
Vol 1036 ◽  
pp. 137-144
Author(s):  
Zhi Bo Sheng ◽  
Chen Kang Wang ◽  
Ling Zheng Wu ◽  
Wen Liang Jin ◽  
Shen You Song Jin
Keyword(s):  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
Infrared Spectrum ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Acid Treatment ◽  
Adsorption Process ◽  
Adsorption Properties ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

The graphene-based composites was prepared by the oxidation of graphene nano-platelets. The characterization results of thermogravimetric analysis (TGA) and Fourier transform infrared spectrum (FT-IR) indicated that acid treatment can generate abundant functional groups on the surface of graphene. The determined equilibrium adsorption capacity of FGN for lead was 57.765 mg/g, which is higher than that of many currently reports. The adsorption process was completed within 40 min and the adsorption isotherms confirmed to Langmuir classical isotherms models.

Effects of Acid and Heat Treatments on the Structure of Sepiolite and its Adsorption of Tannin

2012 ◽  
Vol 518-523 ◽  
pp. 728-731
Author(s):  
Cheng Yuan Su ◽  
Wei Guang Li ◽  
Meng Lin Chen
Keyword(s):  
Fourier Transform ◽  
Adsorption Capacity ◽  
Acid Concentration ◽  
Acid Treatment ◽  
Treatment Time ◽  
Heat Treatments ◽  
Adsorption Properties ◽  
Removal Rates ◽  
Calcined Temperature ◽  
Acid Treatments

In this paper, it was investigated the changes of structure of sepiolites under different conditions of acid treatments and heat treatments using fourier transform infrared spectroscopy(FTIR). At the same time, through the tannin adsorption experiments, it was studied the changes adsorption properties of sepiolites by acid treatments and heat treatments. The H2SO4 treatment was found to be more effective for the removal of tannin than HCl and HNO3 treatments. With increasing the acid concentration and acid treatment time of H2SO4, the removal rates and adsorption capacity of tannin by sepiolites were first increased and then decreased. The removal rates and adsorption capacity were 61.0% and 23.7mg/g when the acid concentration was 4.0mol/l. And the removal rates and adsorption capacity were 62.5% and 24.3mg/g when the acid treatment time was 16 hours. The calcinations treatment exhibited significant effects on the adsorption of tannin. The removal rates and adsorption capacity were 77.9% and 30.8mg/g when the calcined temperature was 400°C. However, when the calcined temperature was 700°C, the removal rates and adsorption capacity were only 54.1% and 20.8mg/g.

scholarly journals Nature and adsorption capacity of banana leaf rim carbon

2017 ◽  
Vol 20 (1) ◽  
pp. 49-56
Keyword(s):  
Thermogravimetric Analysis ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Experimental Result ◽  
Factors Affecting ◽  
Malachite Green Dye ◽  
Infrared Spectrometer ◽  
Ft Ir ◽  
Differential Thermogravimetric Analysis ◽  
Banana Leaf

The activated charcoal (AC) was synthesized from banana leaf rim (BLR) through three activation methods; physical (BLRC), chemical (Z BLRC, zinc chloride) and microwave activation (MW BLRC). The AC was characterized using fourier transform infrared spectrometer (FT-IR), Thermogravimetric analysis (TGA) & Differential thermogravimetric analysis (DTA) instrument and Field emission scanning electron microscope (FE-SEM). The Z BLRC has better thermal stability and adsorbent character compared with BLRC or MW BLRC. The present work is confined to an investigation on the adsorption process of Malachite green dye onto BLRC, Z BLRC & MW BLRC. Factors affecting adsorption process were studied and results that adsorption increases with concentration of dye, agitation time and temperature. This experimental data satisfied the Langmuir adsorption isotherm model. Second order kinetics holds good for the present adsorption process. Thermodynamic parameters were (∆H‡, ∆S‡ & ∆G‡) evaluated. Based on the characterization and adsorption experimental result it may be concluded that Z BLRC has better adsorption capacity than BLRC or MW BLRC.

Synthesis of a Novel Hexanedioyl Thiourea Resin and its Adsorption Properties for Ag(I)

2012 ◽  
Vol 217-219 ◽  
pp. 1213-1217
Author(s):  
Zhong Nan Wang ◽  
Hong Zhong ◽  
Shuai Wang
Keyword(s):  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Interfacial Polymerization ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Properties ◽  
Chelating Resin ◽  
Langmuir Adsorption ◽  
Polyethylene Polyamine ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

A novel hexanedioyl thiourea chelating resin(HTR) was synthesized through interfacial polymerization of hexanedioyl diisothiocyanate and polyethylene polyamine. Its structure was confirmed by FT-IR. The adsorption properties of HTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of HTR for Ag(I) is achieved after 12 hour at 20°C, the equilibrium adsorption capacity is 4.56mmol/g and increases as the temperature or pH rises, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well, and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.

Synthesis and Adsorption Properties for Ag(I) of Pyridinedicanbnyl Thiourea Resin

2012 ◽  
Vol 581-582 ◽  
pp. 180-184 ◽  
Author(s):  
Zhong Nan Wang ◽  
Hong Zhong ◽  
Shuai Wang
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Properties ◽  
Chelating Resin ◽  
Batch Operation ◽  
Langmuir Adsorption ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

A novel pyridinedicanbnyl thiourea chelating resin(PTR) was synthesized from pyridinedicanbnyl diisothiocyanate and diethylene triarmine , its structure was confirmed by FT-IR. The adsorption properties of PTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of PTR for Ag(I) is achieved after 14 hour at 25°C, the equilibrium adsorption capacity is 4.73mmol/g, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well,and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.

scholarly journals Synthesis and characterization of thiol-polystyrene microsphere and its adsorption properties of thallium

2021 ◽  
Vol 237 ◽  
pp. 01001
Author(s):  
Youze Xu ◽  
Yuehui Chen ◽  
Yuanyuan Zhao ◽  
Shuang Zhou ◽  
Guangyi Fu ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Raw Materials ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Membrane Diffusion ◽  
Polystyrene Microspheres ◽  
Polystyrene Microsphere ◽  
Control Step ◽  
Ft Ir ◽  
Modified Polystyrene

Thallium (Tl) is highly toxic in the environment. In order to solve the harm of Tl pollution to the environment, thiol-polystyrene microsphere (TPM) with good adsorption properties for Tl were prepared in this paper. The GAUSSIAN software was used to calculate the adsorption performance of the TPM on Tl+, and the adsorption mechanism was discussed. The thermogravimetric analysis show that the TPM prepared with chloromethyl polystyrene microspheres (CPM) and thiourea as the main raw materials has good chemical thermal stability. In the Tl+ solution of 1mg/L, the adsorption and removal rate of the TPMs in was 99%, with a significant adsorption of Tl+ properties. When the dosage of TPM is 0.4L/g, pH is 6-10, temperature is 5-20 °C, and adsorption time reaches 640min, thallium-containing water with Tl+ concentration of 5mg/L can be treated to within the national discharge standard (5μg/L). The analytical effect of 0.5mol/L dilute sulfuric acid on TPM can reach 99.96%, and the adsorption capacity of TPM on Tl+ is reduced by only 0.1% after repeated use 4 times, which has good regeneration performance. The modified polystyrene microspheres were characterized by EDS, FT-IR, Raman spectra and XPS, and it was proved that the TPM were ligated with Tl+ through the grafted mercapto group, so as to adsorb and remove Tl+ from the solution. According to the isotherm and kinetic model of TPM adsorption Tl+, the maximum saturated adsorption amount of TPM to Tl+ can reach 3.47mg/g, mainly chemical adsorption, and the membrane diffusion stage is the main control step of TPM adsorption Tl+. The results showed that the TPM could be a promising adsorbent with good adsorption capacity and reusability for Tl+ removal from wastewater

The Preparation and Characterization of the Solid Acid Catalyst for the Esterification of the Gutter Oil

2014 ◽  
Vol 881-883 ◽  
pp. 297-301 ◽  
Author(s):  
Yan Zhi Liu ◽  
Shun Ping Wang ◽  
Kun Yuan ◽  
Huian Tang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Active Carbon ◽  
Solid Acid ◽  
Solid Acid Catalyst ◽  
Acid Catalyst ◽  
Raw Material ◽  
Ft Ir

The solid acid catalyst (ACSA) for the gutter oil esterification to biodiesel was prepared via active carbon as raw material by introducing the-SO3H group onto the surface of it. The ACSA were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and elemental analysis (EA), respectively. And the results showed that the-SO3H groups were successfully introduced onto the surface of the active carbon and the containing of the-SO3H groups are higher than 0.017g per gram of ACSA.

Preparation of a Novel Prepolymer of Polyurethane Acrylate

2012 ◽  
Vol 554-556 ◽  
pp. 153-156 ◽  
Author(s):  
Shu Zhen Tan ◽  
Yi Wang ◽  
Yi Fu Zhang ◽  
Wei Long Zhou
Keyword(s):  
Fourier Transform ◽  
Infrared Spectrum ◽  
Fourier Transform Infrared ◽  
Toluene Diisocyanate ◽  
Formaldehyde Resin ◽  
Hydroxyethyl Methacrylate ◽  
Hydroxyl Value ◽  
Polyurethane Acrylate ◽  
Methacrylate Group ◽  
Ft Ir

A new prepolymer of polyurethane acrylate (PUA) was synthesized from cyclohexanone- formaldehyde resin (CFR) with high hydroxyl value, toluene diisocyanate (TDI) and 2-hydroxyethyl methacrylate (HEMA) by using dibutyltion dilaurate as catalyst via two steps. The result from Fourier transform infrared spectrum (FT-IR) showed that methacrylate group was introduced into the terminal of CFR by using TDI as bridge and curable PUA was obtained. Then, the PUA was cured by using azodiisobutyronitrile as catalyst at 110-130°C for 2h. The resulting product has excellent solvent resistance.

Study on Adsorption of U(VI) From Aqueous Solution by Activated MgO

2017 ◽  
Author(s):  
Qingqing Liu ◽  
Xiaoyan Li
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Batch System ◽  
15Mg Dose ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The activated MgO was synthesized by microwave homo-precipitator method and characterized by SEM, EDS and FT-IR methods. It was used to adsorption of U(VI) from aqueous solution with batch system. The paper discussed the effect of pH, temperature, contact time, adsorbent dose and initial U(VI) concentration on the adsorption. The results showed that activated MgO has good adsorption capacity for U(VI), the removal rate and equilibrium adsorption capacity reached 83.5% and 84.04mg·g−1 at pH 5.0, 15mg dose and 313K,respectively. The adsorption kinetics of U(VI) onto activated MgO were better fitted with pseudo-second-order kinetic.The adsorption isotherm data were fitted well to Freundlich isotherm model.The thermodynamic parameters showed that the adsorption process is endothermic and spontaneous.

Synthesis of Triethynylborazine-Polyhydromethylsiloxane Copolymers and its Ceramization

2013 ◽  
Vol 774-776 ◽  
pp. 629-633
Author(s):  
Ji Feng Jiang ◽  
Kang Kang Guo ◽  
Ya Ping Zhu ◽  
Fan Wang ◽  
Hui Min Qi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
X Ray Diffraction ◽  
Hydrosilylation Reaction ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

Triethynylborazine-polyhydromethylsiloxane copolymers (TEB-PHMSs) were prepared through hydrosilylation reaction between -C≡CH attached to boron and ≡Si-H. The structures of TEB-PHMSs were characterized by Fourier transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR) spectroscopy. Their cure behavior were examined by Differential Scanning Calorimeter (DSC) and FT-IR, and then thermostability and ceramization of cured TEB-PHMS were investigated by Thermogravimetric analysis (TGA), pyrolysis-GC-MS, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The results indicated that TEB-PHMSs could be cured and converted into an outstanding thermostable SiBCN ceramics.

Adsorption Properties of Pr3+ and Nd3+ Using Silica Grafted with Larch Tannin

2012 ◽  
Vol 550-553 ◽  
pp. 1561-1565 ◽  
Author(s):  
Tian Tian Xu ◽  
Chu Rui Huang ◽  
Yuan Yuan Luo ◽  
Qiang Du ◽  
Shi Lin Zhao
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Adsorption Properties ◽  
Equilibrium Adsorption ◽  
Dynamics Model ◽  
Adsorption Capacities ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Equilibrium Adsorption Capacity ◽  
Order Rate Equation

The new adsorption material was prepared by grafting the larch tannin onto aminated silica beads with the glutaraldehyde as the cross-linking agent. The adsorption properties of Pr3+and Nd3+on the new adsorbent material in aqueous solution were investigated. The results showed that the equilibrium adsorption capacities of this adsorbent to Pr3+, Nd3+were 402.12mg/g, 305.43mg/g at 303K when the initial concentrations of each ions were 442.7mg/L, 432.6mg/L, respectively and the pH value was 5.5; the maximum adsorption quantities of each ions were 576.34mg/g, 497.02mg/g at 303K when the initial concentrations of each ions were 704.5mg/L, 721.0mg/L, respectively and the pH value was 5.5. The effect of pH value was significant to the equilibrium adsorption capacity, the optimum pH values of this material to Pr3+and Nd3+were both 5.5; while the effect of the temperature was not obvious to the equilibrium adsorption capacity. The adsorption thermodynamics meet Freundlich equation, and the adsorption kinetics data of this adsorbent to Pr3+, Nd3+fitted with the pseudo-second-order rate equation dynamics model.

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