Influence of acid activation on NH3 adsorption properties of Turkish bentonite

Clay Minerals ◽  
2021 ◽  
pp. 1-28
Author(s):  
Burcu Erdoğan ◽  
Orkun Ergürhan ◽  
Aslıhan Anter
Keyword(s):  
Adsorption Properties ◽  
Acid Activation ◽  
Nh3 Adsorption

scholarly journals Study of sepiolite from Goles (Kosovo, Yugoslavia). II. Acid activation

2002 ◽  
Vol 67 (7) ◽  
pp. 499-506 ◽  
Author(s):  
Marina Radojevic ◽  
Vidojko Jovic ◽  
Dragomir Karaulic ◽  
Dragomir Vitorovic
Keyword(s):  
Specific Surface ◽  
Chemical Treatment ◽  
Acid Treatment ◽  
Nitrogen Adsorption ◽  
Adsorption Properties ◽  
Acid Activation ◽  
Surface Areas ◽  
Bet Method ◽  
Specific Surface Areas ◽  
Enhanced Adsorption

The changes in the pore structure and adsorption properties of sepiolite from Goles resulting from treatment with 4MHCl for various periods of time were investigated. The BET method specific surface areas, pore volumes and f ? plots were determined by nitrogen adsorption. The surface area progressively increased during the 70 hours of acid treatment, when a maximum was attained. The differences in the adsorption properties of the original and the acid treated sepiolite were evaluated by comparison of adsorption isotherms obtained with benzene, n-hexane, methanol and isooctane. The enhanced adsorption of isooctane was of great interest, since the sorption of this compound on natural sepiolites is generally very limited. The results suggest that chemical treatment of sepiolite with 4MHCl for 70 h produces an adsorbent of optimal porosity and other adsorption properties.

Preparation and Decolorization Properties of Active Industrial Vermiculites

2010 ◽  
Vol 178 ◽  
pp. 210-215
Author(s):  
Bai Li Su ◽  
Tong Jiang Peng ◽  
Guo Hua Ma
Keyword(s):  
Acid Concentration ◽  
Adsorption Properties ◽  
Optimum Process ◽  
Process Conditions ◽  
Acid Activation ◽  
Activation Time ◽  
Activation Temperature ◽  
Rate Testing ◽  
Cationic Exchange ◽  
Decoloration Rate

Based on cationic exchange and adsorption properties of industrial vermiculites, acid-activation processing and decoloration rate testing for industrial raw vermiculite samples industrial vermiculite samples from the Yuli Mine in Xinjiang Uygur Autonomous Region were researched. Some factors that influenced the acid-activated products adsorption and the decolorization performance were investigated, such as acid concentration, activation time, activation temperature etc., and optimum process conditions were developed as follows: the acid concentration was 3.0 mol/L, the activation time was 3 h and the activation temperature was 90°C, under these conditions, the decoloration rate of acid-activated sample was 88.46%.

Study of Adsorption Properties of Bentonite Clay

2021 ◽  
Author(s):  
Reda Marouf ◽  
Nacer Dali ◽  
Nadia Boudouara ◽  
Fatima Ouadjenia ◽  
Faiza Zahaf
Keyword(s):  
Kinetic Data ◽  
Bentonite Clay ◽  
Adsorption Properties ◽  
Ammonium Bromide ◽  
Acid Activation ◽  
Order Kinetic ◽  
Free Energy Of Adsorption ◽  
Adsorption Models ◽  
Pseudo Second Order ◽  
Pseudo First Order

The clay used in this study was the bentonite from Mostagnem, Algeria. This material is used in many fields such as drilling, foundry, painting, ceramics, etc. It can also be applied in the treatment of wastewaters from chemical industries by means of adsorption. In this chapter the physicochemical properties of bentonite were determined by using several analyses techniques such as chemical composition, XRD, FTIR and SBET. The bentonite was intercalated by aluminum poly-cations solution and cethytrimethyl ammonium bromide. The acid activation of natural bentonite was performed by treatment with hydrochloric acid at different concentrations. The surface water pollutants removed by the modified bentonites are bemacid yellow E-4G and reactive MX-4R dyes, and fungicide chlorothalinil. The Langmuir and Freundlich adsorption models were applied to describe the related isotherms. The pseudo-first order and pseudo-second order kinetic models were used to describe the kinetic data. The changes of enthalpy, entropy and Gibbs free energy of adsorption process were also calculated.

Kinetically controlled ammonia vapor diffusion synthesis of a Zn(ii) MOF and its H2O/NH3 adsorption properties

2016 ◽  
Vol 4 (26) ◽  
pp. 10345-10351 ◽  
Author(s):  
Yang Chen ◽  
Chengyin Yang ◽  
Xiaoqing Wang ◽  
Jiangfeng Yang ◽  
Kun Ouyang ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Energy Input ◽  
Adsorption Properties ◽  
Ammonia Vapor ◽  
External Energy ◽  
Vapor Diffusion ◽  
Kinetically Controlled ◽  
Nh3 Adsorption ◽  
Unique Method

A unique method for synthesizing a Zn(ii) complex Zn(INA)2(H2O)4 (INA = isonicotinate) has been developed by kinetically controlled ammonia (NH3) vapor diffusion at low temperatures without any external energy input.

Comparison on Pore Development of Activated Carbon Produced from Scrap Tire by Hydrochloric Acid and Sulfuric Acid

2012 ◽  
Vol 626 ◽  
pp. 706-710 ◽  
Author(s):  
Athiwat Sirimuangjinda ◽  
Duangduen Atong ◽  
Chiravoot Pechyen
Keyword(s):  
Methylene Blue ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Surface Area ◽  
Activated Carbons ◽  
Adsorption Properties ◽  
Bet Surface Area ◽  
Acid Activation ◽  
Scrap Tire ◽  
Methylene Blue Adsorption

Two activated carbons employing Scrap Tire as precursor were produced by using two different activating agents, HCl and H2SO4 (fixed impregnation ratio 1:1). Both of activated carbons were allowed by single-step to get difference carbonized at 500, 600 and 700°C in a muffle furnace for 1 h. Activated carbons differed with the physical structure, chemical and adsorption properties which were derived from Scanning Electron Microscope, and N2 adsorption/desorption isotherms. Batched sorption studies were performed to compare the iodine and methylene blue adsorption properties of two carbons. The carbon materials obtained from sulfuric acid activation of 500°C has BET surface area as high as 1066.70 m2/g, Methylene blue adsorption and Iodine number of 288.90 and 590.50 mg/g, respectively. The surface area and adsorption properties of carbon produced using sulfuric acid activation were higher than that produced using hydrochloric acid activation. The results suggest the feasibility of the process from the point of view of both porous texture and adsorption yield.

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