Removal of Cr(VI) from aqueous solution by biochar derived from rice husk

Risfidian Mohadi,Alfan Wijaya,Normah Normah,Novie Juleanti,Patimah Mega Syah Bahar Nur Siregar,Aldes Lesbani,Neza Rahayu Palapa,Tarmizi Taher

doi:10.21924/cst.6.1.2021.293

Risfidian Mohadi, Alfan Wijaya + Show 6 more

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https://doi.org/10.21924/cst.6.1.2021.293

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Abstract

In this work, biochar produced from Indonesian rice husks. Then used as adsorbent of Cr(VI) in aqueous solution. The XRD pattern of biochar showed the characterization pattern at 23º (002) reflection, appearance of silicate oxide, and the carbon vibrations. The surface area and SEM morphologies confirmed that after pyrolysis treatment the surface of rice husk has changed. The surface area of biochar increased after thermal treatment. The adsorption study of Cr(VI) by biochar demonstrate 2nd-order reaction, and Langmuir isotherm models. The maximum adsorption capacity of biochar derived rice husk to adsorb Cr(VI) is 161.290 mg/g, and biochar showed the good potential as reuseable adsorbent to remove heavy metal in aqueous solution.

Highlights

Chromium (Cr) is a great electroplating source and a heavy metal pollutant obtained from several industrial processes that can affect the environment [1,2]
The results showed that the adsorption capacities were 5.75, 3.00, and 11.75 mg/g, respectively
Identification of functional groups was conducted by Fourier Transform Infra-Red (FTIR) Shimadzu Prestige-21 using KBr pellet while the BET surface area analysis was conducted using Quantachrome Micromeritic 2020 instrument and the sample degassed by liquid N2 before the process

Summary

Introduction

Chromium (Cr) is a great electroplating source and a heavy metal pollutant obtained from several industrial processes that can affect the environment [1,2]. This compound is released from mines, pottery, and photography [3,4], with the ion structure usually formed as 3+ and 6+ in an aqueous environment. Adsorption is a popular treatment that has low preparation cost, high efficiency, and is easy to operate depending on the adsorbent ability [8,9,10]. The most appealing forms are agricultural wastes-based biomass, such as wheat straw, mangifera indica, bagasse, rose waste, and maize corncob [11,12,13,14]

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