Chemical modification of granular activated carbon for enhancement of arsenic adsorption

Lei Yang, J. Paul Chen

Research output: Contribution to conferencePaperpeer-review

Abstract

Chemically treated granular activated carbon (MGAC) significantly enhanced As(V) removal over virgin granular activated carbon (GAC), especially at trace As(V) levels. The removal of As(V) for both MGAC and GAC were quite pH dependent. The optimal pH for As(V) adsorption occurred at 5.0 and 6.0 for MGAC and GAC separately. At initial As(V) concentration 150 ppb, a dosage of 5 g/L MGAC resulted in a residue As less than 10 ppb, compared with 80 ppb by GAC. Kinetics study showed that at initial As(V) 150 ppb, more than 99% As(V) was removed by MGAC within 30 minutes, compared with 120 minutes by GAC. This difference, however, was not apparent at high As(V) concentrations. Langmuir model fitting well with isotherm data, which gave the maximum As(V) binding capacities (qmax) 1.23 and 1.14 mg/g for MGAC and GAC separately. The affinity of As(V) (b) to MGAC (1.86 L mg-1) was much higher than that of GAC (0.88 L mg-1).

Original languageEnglish
Pages5623
Number of pages1
StatePublished - 2005
Externally publishedYes
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: 30 Oct 20054 Nov 2005

Conference

Conference05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period30/10/054/11/05

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