Clay-biochar composite for arsenic removal from aqueous media

M. Vithanage, L. Sandaruwan, G. Samarasinghe, Y. Jayawardhana

Research output: Chapter in Book/Conference paperConference paperpeer-review

2 Citations (Scopus)

Abstract

Arsenic is present mainly in groundwater in the forms of highly toxic arsenate and arsenite. Biochar has been a promising cost effective and carbon negative material for many different contaminants such as trace metals, antibiotics, pesticides etc., however, not for anionic metalloids as arsenic. This study intended to evaluate the potential of a novel composite prepared using biochar, derives from fibrous fraction of municipal solid waste in Gohagoda landfill site, Kandy, Sri Lanka and red earth clay for remediate As(III) in aqueous media. Pyrolyzed biochar+red earth composite was characterized for its physicochemical properties. Furthermore, As(III) pH dependency (pH 3–9), kinetics behavior and sorbate (50–1000 µg L−1) concentrations were investigated using a batch sorption technique. The concentrations of As(III) in aqueous media were measured by inductively coupled plasma optical emission spectrometry. For arsenic (III), pH 6–7 range was favorable for adsorption process. Whereas, highest adsorption at 24 hours reaction time at pH 6–7 recorded as around 25% (12.5 µg g−1) for arsenic (III). Moreover, well fitted pseudo second order (R2 = 0.928) could suggest chemical adsorption mechanism rather than a physical adsorption mechanism in to the adsorbent. Hence, process involved with chemisorption can be suggested as the As(III) removal mechanism. However, further isotherm experiments are needed with expanded concentration range to mechanism identification.

Original languageEnglish
Title of host publicationEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
EditorsYong-Guan Zhu, Yong-Guan Zhu, Huaming Guo, Huaming Guo, Prosun Bhattacharya, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Arslan Ahmad, Arslan Ahmad, Ravi Naidu, Ravi Naidu
PublisherCRC Press
Pages437-438
Number of pages2
ISBN (Print)9781138486096
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, China
Duration: 1 Jul 20186 Jul 2018

Publication series

NameEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018

Conference

Conference7th International Congress and Exhibition Arsenic in the Environment, 2018
Country/TerritoryChina
CityBeijing
Period1/07/186/07/18

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