Removal of chromium from wastewater using paper waste sludge-derived hyrdrochar modified by naoh

Lan Huong Nguyen; Huu Tap Van; Quang Trung Nguyen; Thu Huong Nguyen; Thi Bich Lien Nguyen; Thi Phuong Thuy Pham; Thai Hoang Le; Manh Ha Bui; Viet The Ho; Ordanza Hanna Joy Tilpo; Marcaida Gio Serafin Ivan Jimenez; Tra Mai Ngo

doi:10.15625/0866-7187/15704

Author affiliations

Authors

Lan Huong Nguyen Faculty of Environment - Natural Resources and Climate Change, Ho Chi Minh City University of Food Industry (HUFI), Ho Chi Minh City, Vietnam
Huu Tap Van Faculty of Natural Resources and Environment, TNU - University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
Quang Trung Nguyen Faculty of Natural Resources and Environment, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
Thu Huong Nguyen Faculty of Natural Resources and Environment, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
Thi Bich Lien Nguyen Faculty of Natural Resources and Environment, TNU-University of Sciences (TNUS), Tan Thinh Ward, Thai Nguyen City, Vietnam
Thi Phuong Thuy Pham Faculty of Biological Technology, Ho Chi Minh City University of Food Industry (HUFI), Ho Chi Minh City, Vietnam
Thai Hoang Le Department of Environmental Engineering, International University, Vietnam National University, Ho Chi Minh City, Vietnam
Manh Ha Bui Department of Environmental Sciences, Saigon University, Ho Chi Minh City, Vietnam
Viet The Ho Faculty of Environment-Natural Resources and Climate Change, Ho Chi Minh University of Food Industry (HUFI), Ho Chi Minh City, Vietnam
Ordanza Hanna Joy Tilpo Department of Environmental Science and Management, Advanced Education Program - TNU - University Agriculture and Forestry (TUAF), Quyet thang Ward, Thai Nguyen City, Vietnam
Marcaida Gio Serafin Ivan Jimenez Department of Environmental Science and Management, Advanced Education Program - TNU - University Agriculture and Forestry (TUAF), Quyet thang Ward, Thai Nguyen City, Vietnam
Tra Mai Ngo Institute of Physic, VAST, Ha Noi, Vietnam

DOI:

https://doi.org/10.15625/0866-7187/15704

Keywords:

Chromium, hydrochar, adsorption, paper waste sludge, ion exchange

Abstract

In this work, paper waste sludge (PWS) collected from the primary settling tank of the paper wastewater treatment plant was utilized to generate hydrochar as a low-cost adsorbent for removal of Cr(VI) from aqueous solution. The characteristics of paper waste sludge hydrochar (PWSH) and the effects of adsorption conditions of Cr(VI) onto PWSH, including solution pH (3-9), contact time (5-240 min), initial Cr(VI) concentration (10-80 mg/L) and the adsorbent dose of 1 g/L at room temperature (25±2°C) were investigated. Adsorption isotherm and kinetics were also predicted in this work. The results indicate that the maximum adsorption capacity achieved 11.89 mg/g at 120 min of contact time, pH 3, and initial Cr(VI) concentration of 60 mg/L. The adsorption isotherm was reflected the best by the Langmuir model (R² of 0.9968). Whereas, the adsorption kinetic also indicates that the pseudo-second-order model predicted the best for Cr(VI) adsorption process with a R² of 0.9469. The mechanism of Cr(VI) adsorption process onto PWSH was chemical sorption through electrostatic interaction and ion exchange.

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