Application of an Alkali Functionalized Material for Treating Pharmaceutical Wastewater Containing Chlorhexidine Gluconate and Cetrimide. Issue 2 (12th December 2015)

• Record Type: Journal Article
• Authors: Banerjee, Debasree; Jana, Shyamal; Sarkar, Ujjaini; Roy, Debasri
• Is Part Of: Clean. Volume 44:Issue 2(2016:Feb.)
• Page Start: 169
• Page End: 179
• Publication Date: 2015-12-12
• Subjects: Adsorption -- Antiseptics -- Mesoporous material -- Microporous activated carbon -- Modeling; Water quality -- Periodicals; Water -- Pollution -- Periodicals; Pollution -- Periodicals; Bioremediation -- Periodicals; Sewage -- Periodicals; Water chemistry -- Periodicals; 333.7205
• DOI: 10.1002/clen.201400340
• Languages: English
• ISSNs: 1863-0650

Abstract

Abstract : Two different types of mesoporous adsorbents and one microporous adsorbent were used for the adsorption of chlorhexidine gluconate and Cetrimide. Chlorhexidine gluconate and Cetrimide are widely used in antiseptic solutions, mouthwashes, and germicidal hand rinses, etc. Scanning electron microscopy images, N2 adsorption/desorption isotherms, pore size distribution, Fourier transform infrared spectra and points of zero charge illustrate that significant changes occur on the activated carbon after functionalization with NH4 OH when compared to the precursor granular activated carbon (GAC). The adsorption capacity of the novel alkali functionalized activated carbon (FAC‐NH3 ) was found to be comparable with the highly expensive mesoporous aluminosilicate MCM‐41 for both chlorhexidine gluconate and cetrimide. For a wide concentration range, adsorption with FAC‐NH3 is approximately three times more in comparison to GAC for both compounds. Chlorhexidine gluconate forms surface complexes with the functional groups present in the super microporous FAC‐NH3 . This fact is also supported by kinetic studies, where pseudo first‐order and second‐order models, intra‐particle diffusion, and Boyd's plots showed evidences to support chemisorption, on top of pure physical adsorption. Abstract : The adsorption capacity of an alkali functionalized activated carbon (FAC‐NH3) toward chlorhexidine gluconate (see figure) and cetrimide is comparable to the highly expensive mesoporous aluminosilicate MCM‐41. The enhancement of the adsorption capacity of FAC‐NH3 in comparison to granular activated carbon (GAC) is mainly due to the development of super‐microporosity and the introduction of functional groups after the modification of GAC with NH4 OH.