Easily Regenerative Carbon/Boehmite Composites with Enhanced Cyclic Adsorption Performance toward Methylene Blue in Batch and Continuous Aqueous Systems

AbstractUltrafine matrix composite powder was prepared from brown corundum slag, grinding balls, anhydrous ethanol, and modifier using a planetary ball mill. The adsorption material was used for dyeing wastewater treatment. A pH instrument, spectrophotometer, and digital water bath oscillator were used to study the amount of modifier, milling speed, milling time, ball-to-powder weight ratio, and slurry concentration to investigate the effects of preparation conditions on the adsorption performance of adsorbent material. The prepared adsorbents and activated carbon were used to adsorb methylene blue in solution under the same conditions to compare adsorbent dosage, adsorption time, temperature, pH of solution, and initial concentration of methylene blue and to study their effects on methylene blue decolorization rate. The experiment results show that dosage of R of 7.5%, ball-to-powder weight ratio of 14:1, rotational speed of 500 rpm, slurry concentration of 20%, and ball milling time of 2.5 h were the optimum parameters. The composite powder (4 g/l) was added to methylene blue wastewater (35 mg/l), pH was adjusted to 6, and adsorption was carried out for 0.5 h at 30°C. The removal rate reached 99.4%.

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Experimental Study on the Adsorption of MB on Novel Photocatalyst Yeast/ZnS Hybrid Microspheres

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.924.129 ◽

2014 ◽

Vol 924 ◽

pp. 129-133

Author(s):

Hai Gang Gou ◽

Wei Sheng Guan ◽

Li Yang ◽

Zhao Qi Wang ◽

Yang Zhi Zhu

Keyword(s):

Experimental Study ◽

Methylene Blue ◽

Adsorption Capacity ◽

Experimental Results ◽

Yeast Cells ◽

Isotherm Modeling ◽

Adsorption Performance

Employing yeast cells as carriers,a novel cell-loaded photocatalyst yeast/ZnS (YC/ZnS) was successfully synthesized. The adsorption performance of methylene blue on the YC/ZnS microspheres was studied. Experimental results showed that the optimized adsorption conditions were 23°C,pH7 and the YC/ZnS dosage 4.5g/L. Under these conditions,the adsorption capacity of YC/ZnS could reach 471.2μg/g. Isotherm modeling revealed that Freundlich equations described well the adsorption of methylene blue onto YC/ZnS.

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Adsorption of Methylene Blue and Congo Red on Bentonite Modified with CaCO3

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.853 ◽

2017 ◽

Vol 727 ◽

pp. 853-858 ◽

Cited By ~ 2

Author(s):

Han Bing Zhang ◽

Ning Hua Chen ◽

Zhang Fa Tong ◽

Qi Feng Liu ◽

Yan Kui Tang ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Isotherms ◽

Adsorption Kinetics ◽

Congo Red ◽

Phosphate Adsorption ◽

Adsorption Effect ◽

Adsorption Performance ◽

Initial Ph ◽

Removal Efficiencies ◽

Ph Range

Both bentonite and CaCO3 are cheap and abundant superior regional non-metal ores in Guangxi province, so it is very meaningful to jointly exploit bentonite and CaCO3 for real applications. In this study, bentonite modified with CaCO3 (CCB) was prepared and its adsorption performance of Congo Red (CR) and Methylene Blue (MB) was evaluated by investigating the adsorption influencing effects of initial pH, SDBS and phosphate. Adsorption isotherms and adsorption kinetics models were also fitted to analysis the corresponding kinetic characteristics of CCB. The results show that CCB exhibited superior adsorption performance with the respective > 90% MB and CR removal within the initial pH range 2 ~ 10. To a certain extent, MB removal efficiencies by CCB can be increased with the addition of SDBS. On the other hand, CR adsorption on CCB was inhibited slightly in presence of SDBS. But as a whole, removal efficiencies of MB and CR by CCB were kept constant when SDBS co-existed. MB and CR adsorption on CCB decreased to some extent because of competitive adsorption effect when phosphate co-existed. It also demonstrated that CCB can remove phosphate at the same time with dyes. Adsorption models including adsorption isotherms adsorption kinetics indicated that MB and CR adsorption on CCB was a monolayer process, and the adsorption rate depended on both adsorbent and adsorbate. In summary, CCB is a promising adsorbent for dyes removal with many advantages such as simple preparation technology, excellent adsorption performance for anionic and cationic dyes, broad fitting pH range and SDBS resistance. Besides, it can remove dyes together with phosphate at the same time. Therefore, this study is very useful for the dyeing wastewater treatment and exploiting the resources of bentonite and CaCO3.

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