A research study on Cr(VI) removal from electroplating wastewater using chemically modified coconut shell-based activated carbon and treated zeolite
Abstract:In this research, the technical feasibility of using coconut shell-based activated carbon (CSBAC) and zeolite for Cr(VI) removal from electroplating wastewater was investigated using batch studies at varying Cr concentrations (5 to 25 mg/l). The granular CSBAC was made up of coconut shell, an abundantly available agricultural waste from the local coconut industry in Thailand. Chemical treatments of CSBAC and zeolite with HNO3 and NaCl, respectively, were also conducted to improve their removal capabilities. The results of their removal performances on Cr were evaluated and statistically compared. It was conclusively evident that the chemically treated adsorbents (CSBAC and zeolite) demonstrated significantly better removal capabilities for Cr6+ (CSBAC: 15.47, zeolite: 3.23 mg/g) than asreceived adsorbents (CSBAC: 4.72, zeolite: 1.79 mg/g), respectively. It was also found that nitric-oxidized CSBAC and NaCl-treated zeolite were capable of Cr removal at lower concentrations (5 and 10 mg/l) with the Cr adsorption capacities as follows: nitric-oxidized CSBAC (7.88 and 6.66 mg/g) and NaCl-treated zeolite (4.20 and 3.55 mg/g), respectively; thus, suggesting that both chemically treated adsorbents are highly capable of treating Cr effluents at lower concentrations. It is important to note that their adsorption capacities on Cr6+ vary, depending on the characteristics of the individual adsorbent, the extent of chemical treatment/modification, and the initial concentration of chromium.
Document Type: Research Article
Publication date: 2003-01-01
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