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.

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.

Purification of phloridzin from Lithocarpus polystachyus Rehd leaves using polymeric adsorbents functionalized with glucosamine and β-cyclodextrin

2014 ◽  
Vol 68 (11) ◽  
Author(s):  
Qian-Wen Wang ◽  
Jia-Jia Liu ◽  
Xiong Liu ◽  
Hong-Wei Zha ◽  
Na Ren
Keyword(s):  
Fourier Transform ◽  
Adsorption Capacity ◽  
Chromatographic Separation ◽  
Adsorption Properties ◽  
Purification Method ◽  
Freundlich Model ◽  
High Efficient ◽  
One Step ◽  
The Fourier Transform ◽  
Column Chromatographic

AbstractA high-efficient purification method of flavonoids from Lithocarpus polystachyus Rehd leaves is reported. Two adsorbents functionalized with glucosamine (GA) and β-cyclodextrin (β-CD) were synthesized and characterized by the Fourier transform infrared (FTIR) spectra. Also, adsorption properties and purification effect of flavonoids on different adsorbents were investigated. Two typical commercial adsorbents, AB-8 and D101, were employed as the reference materials. The adsorption capacity was enhanced remarkably by the introduction of GA and β-CD groups to the adsorbents. Moreover, the isotherms were well fitted by the Freundlich model. After a one-step column chromatographic separation, the purity of phloridzin increased significantly from 14.65 % to 79.48 % for PS-CD, to 66.56 % for PS-GA, 44.68 % for D101, and to 52.84 % for AB-8. This study provides a novel alternative matrix for the purification of phloridzin from Lithocarpus polystachyus Rehd leaves extracts.

Research of Citric Acid Modified Adsorption of Cr (VI) Properties of Activated Carbons

2014 ◽  
Vol 809-810 ◽  
pp. 901-906
Author(s):  
Chen Li Wang ◽  
Jin Chuan Gu ◽  
Chun Mei Wei ◽  
Li Fang Bao ◽  
Rui Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Citric Acid ◽  
Acid Concentration ◽  
Rate Equation ◽  
Treatment Time ◽  
Activated Carbons ◽  
Adsorption Properties ◽  
Adsorption Rate ◽  
Citric Acid Concentration ◽  
Modified Activated Carbon

Citric acid modification of activated carbon to examine citric acid concentration, temperature and time modified adsorption properties of activated carbon. The results demonstrate that with the extension of temperature and treatment time, the adsorption properties of modified activated carbon were then decreased overall trend. Better process for citric acid modified activated carbon: citric acid concentration of 50%, modified temperature is 30°C, modified time is 5h. Lagergren adsorption rate equation with primary and secondary adsorption rate equation and the average absolute deviation from the rate on the adsorption properties of these factors affects the processing; secondary adsorption kinetics model was found to better describe the various factors affecting the adsorption process under conditions.

Optimization of Treatment Parameters on the Recycling of Used Lubricating Oil

2013 ◽  
Vol 699 ◽  
pp. 735-741 ◽  
Author(s):  
Ambali Saka Abdulkareem ◽  
Edison Muzenda ◽  
Ayo Samuel Afolabi
Keyword(s):  
Metal Content ◽  
Acid Treatment ◽  
Conventional Treatment ◽  
Treatment Time ◽  
Optimal Solution ◽  
Absorption Spectrometry ◽  
Treatment Temperature ◽  
Lubricating Oil ◽  
Used Oil ◽  
Treatment Parameter

Acid treatment is one of the cheapest techniques and least applicable processes in the recycling of used lubricating oils. In this work, the performance of sulphuric acid in the treatment used oil was studied. The effects of the critical treatment parameters (acid volume, concentration of the acid, treatment temperature, stirring time and treatment time) were investigated by varying one treatment parameter at a time and analysing metal content in the sample of the treated oil using atomic absorption spectrometry (ASS). Thereafter, an optimal solution was determined by the combination of the optimum values of each treatment parameters. The original conventional treatment parameter values, resulted in 13.2 ppm and thereafter was optimised to 11 ppm this showed a definite improvement in efficiency. This result is also comparable to other data obtained in previously studied work which employed the same conventional treatment parameters. The optimal solution is within 10% variation as compared the standard individual metal content which ranges 0-10 ppm.

Heat Treatments Effect on the Mechanical Properties of Industrial Drawn Copper Wires

2013 ◽  
Vol 811 ◽  
pp. 9-13 ◽  
Author(s):  
Zakaria Boumerzoug ◽  
Zakaria Boumerzoug ◽  
Vincent Ji
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Treatment Time ◽  
Void Formation ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Ambient Atmosphere ◽  
Creep Tests ◽  
Prior Heat Treatment ◽  
Industrial Material

In this present investigation, the mechanical properties of industrial drawn copper wires have been studied by creep tests, tensile tests and hardness Vickers. The effect of prior heat treatments at 500°C for different time on the drawn wires behavior was the main goal of this investigation. We have found that these heat treatments influenced the creep behavior of drawn wires and recorded shape curves. The creep tests were applied under ambient atmosphere at 240 °C. The creep duration before rupture decreased with the prior heat treatment time. The creep tests results were confirmed by tensile tests. A relationship between the hardness and the ultimate tensile strength of this industrial material has been established. Optical and scanning electron microscopy observations have been also used. Cross section observations of the wire after tensile or creep-rupture tests have shown that the mechanism of rupture was mainly controlled by the void formation.

Zeolites featuring 14×12-Ring Channels with Unique Adsorption Properties

2021 ◽  
Author(s):  
Peng Wu ◽  
Shiqing Li ◽  
Lu Han ◽  
Zhonglin Zhao ◽  
Hao Xu ◽  
...  
Keyword(s):  
Acid Treatment ◽  
Adsorption Properties ◽  
Silylating Agent

The lamellar precursor PREFER was applied to develop interlayer expanded zeolite IEZ-FER(D4h) with extra-large pores through hydrothermal acid treatment-assisted molecular alkoxysilylation using 1,3,5,7-tetramethyl cyclo tetrasiloxane (D4h) as a silylating agent...

Characteristics of Lithium Polysilicate Electrolyte Synthesized by Sol-Gel Processing

2007 ◽  
Vol 124-126 ◽  
pp. 1031-1034
Author(s):  
Bong Soo Jin ◽  
Bok Ki Min ◽  
Chil Hoon Doh
Keyword(s):  
Heat Treatment ◽  
Acid Treatment ◽  
Treatment Time ◽  
Sol Gel ◽  
Silicate Solution ◽  
Treatment Temperature ◽  
Lithium Silicate ◽  
Treatment Conditions ◽  
Xrd Patterns ◽  
Si Wafer

To find out suitable Si surface treatment and heat treatment conditions, acid treatment of Si wafer was done for lithium polysilicate electrolyte coating on Si wafer. In case of HCl treatment, the wet angle of a sample is 30o, which is the smallest wet angle of other acid in this experiment. Acid treatment time is 10 min, which is no more change of wet angle. Lithium polysilicate electrolyte was synthesized by hydrolysis and condensation of lithium silicate solution using perchloric acid. Thermal analysis of lithium polysilicate electrolyte shows the weight loss of ~23 % between 400 and 500 , which is due to the decomposition of LiClO4. The XRD patterns of the obtained lithium polysilicate electrolyte also show the decrement of LiClO4 peak at 400 . The optimum heat treatment temperature is below 400 , which is the suitable answer for lithium polysilicate electrolyte.

Morphology dependent adsorption of methylene blue on trititanate nanoplates and nanotubes prepared by the hydrothermal treatment of TiO2

2016 ◽  
Vol 75 (2) ◽  
pp. 350-357
Author(s):  
Graham Dawson ◽  
Wei Chen ◽  
Luhua Lu ◽  
Kai Dai
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Pore Volume ◽  
Hydrothermal Reaction ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
High Capacity ◽  
Adsorption Properties

The adsorption properties of two nanomorphologies of trititanate, nanotubes (TiNT) and plates (TiNP), prepared by the hydrothermal reaction of concentrated NaOH with different phases of TiO2, were examined. It was found that the capacity for both morphologies towards methylene blue (MB), an ideal pollutant, was extremely high, with the TiNP having a capacity of 130 mg/g, higher than the TiNT, whose capacity was 120 mg/g at 10 mg/L MB concentration. At capacity, the well-dispersed powders deposit on the floor of the reaction vessel. The two morphologies had very different structural and adsorption properties. TiNT with high surface area and pore volume exhibited exothermic monolayer adsorption of MB. TiNP with low surface area and pore volume yielded a higher adsorption capacity through endothermic multilayer adsorption governed by pore diffusion. TiNP exhibited a higher negative surface charge of −23 mV, compared to −12 mV for TiNT. The adsorption process appears to be an electrostatic interaction, with the cationic dye attracted more strongly to the nanoplates, resulting in a higher adsorption capacity and different adsorption modes. We believe this simple, low cost production of high capacity nanostructured adsorbent material has potential uses in wastewater treatment.

scholarly journals ELIMINATION OF TOXIC ELEMENTS BY NATURAL AND SYNTHETIC ADSORBENTS

2020 ◽  
Vol 1 (21) ◽  
Author(s):  
Zuzana Danková ◽  
Alexandra Bekényiová ◽  
Zuzana Mitróová ◽  
Danka Gešperová
Keyword(s):  
Chemical Modification ◽  
Adsorption Capacity ◽  
Quartz Sand ◽  
Toxic Elements ◽  
Magnetic Particles ◽  
Binary Solution ◽  
Adsorption Properties ◽  
Column Tests ◽  
Batch Tests ◽  
Synthetic Adsorbents

The adsorption of Zn(II) and Cu(II) onto siderite (S) and kaolin (K) and adsorption of As(V) ontobentonite (B) was studied. The chemical modification – precipitation of MnO2 on the kaolin (KM) andsiderite (SM) surface was used to improve the adsorption properties of natural materials for theirapplication in columns. In the batch tests the higher adsorption capacity was observed for the KMsample. The binary solution of Zn(II)/Cu(II) was percolated through the columns filled with quartz sand(QS) as a bearer of KM or SM. The effect of toxic elements removal reached in average 90 % for bothcolumns.The adsorption of As(V) onto natural bentonite (B) and synthetic magnetic particles (MP) was studiedby batch as well as column tests. Whereas the B sample did not perform good adsorption properties inbatch test, in dynamic conditions its effect was comparable with MP. The effect of As(V) removal wasstudied in a number of series with different materials beddings and cycles repetitions. The resultsshowed that the most effective was the column filled with QS+B+MP containing more coarse-grainedfraction of bentonite. In the second cycle its removal effect reached 60 % of As(V) elimination from thesolution.

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