Abstract
Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.
Highlights
Dyes have been widely used in several industries, such as textiles, leather, paper, printing, cosmetics and so on, which, lead to serious environmental problems (Ma et al, 2013)
The surface of treated shrimp shell particle (TSSP) was much rougher than that of raw shrimp shell particle (RSSP), which could be due to the calcium carbonate crystals that clustered on the chitin after deproteinization (Tong and Yao, 1997)
Two novel adsorbents—raw shrimp shell powder (RSSP) and treated shrimp shell powder (TSSP)—were prepared from shrimp shell waste
Summary
Dyes have been widely used in several industries, such as textiles, leather, paper, printing, cosmetics and so on, which, lead to serious environmental problems (Ma et al, 2013). In printing and dyeing industries, a considerable amount of effluent is generated, which contains aromatic, polycyclic aromatic or heterocyclic dye, toxic, and carcinogenic compounds that are difficult to be removed and biodegraded (Crini, 2006). Congo red (CR) named [1-naphthalenesulfonic acid, 3,30-(4,40-biphenylenebis (azo)) bis(4-amino-) disodium salt] is a benzidine-based anionic diazo dye, which has been known to cause an allergic reaction and to be metabolised to benzidine, a human carcinogen (Vimonses et al, 2009). The color variations may be attributed to resonance among charged canonical structures or the protonation of its amino groups (Purkait et al, 2007)
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