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

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.


Keywords


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

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DOI: https://doi.org/10.15625/0866-7187/15704 Display counter: Abstract : 188 views.

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