Adsorption of Hg(II) in an Aqueous Solution by Activated Carbon Prepared from Rice Husk Using KOH Activation

Abstract

With the development of industry, the discharge of wastewater containing mercury ions posed a serious threat to human health. Using biomass waste as an adsorbent to treat wastewater containing mercury ions was a better way due to its positive impacts on the environment and resource saving. In this research, activated carbon (AC) was prepared from rice husk (RH) by the KOH chemical activation method. The characterization results of scanning electron microscopy (SEM), Brunauer−Emmett−Teller (BET), Fourier transform infrared (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) showed that rice husk-activated carbon (RHAC) had good pore structure and oxygen-containing functional groups. The influences of contact time, initial concentration of Hg(II), adsorbent dosage, pH, and ionic strength on mercury ion removal were investigated. The Langmuir model was most suitable for the adsorption isotherm of RHAC, and its maximum adsorption capacity for Hg(II) was 55.87 mg/g. RHAC still had a high removal capacity for Hg(II) after five regeneration cycles. RHAC had excellent removal efficiency for mercury ion wastewater. At the same time, RH could be used as a nonpolluting and outstanding characteristic adsorbent material.

Assessment of Natural Zeolite Clinoptilolite for Remediation of Mercury-Contaminated Environment

“…In literature reports, higher but inconsistent sorption capacities and removal efficiencies of mercury can be found, but sorption is mostly performed from modal solutions with significantly higher initial mercury concentrations [71,72]. Higher concentration usually leads to improved sorption capacity due to the greater driving force [73]. Furthermore, compared to modal solutions, obtained leachates comprise of various organic and inorganic mercury species, which significantly affect mercury uptake.…”

Simulação Da Concentração De Matéria Orgânica Em Canais Urbanos: Estudo De Caso Canal Do Prado, Campina Grandepb

“…Os mecanismos de adsorção incluem basicamente dois tipos de interações, a adsorção química que corresponde a ligações químicas entre o sistema adsorvente/adsorbato e a adsorção física relacionada as forças de Van der Waals e de troca iônica (Figura 1). Esses mecanismos são investigados por meio de dados do equilíbrio, cinética e caracterização do adsorvente antes e após o processo (MOHAMMED;KAREEM, 2019;LIU et al, 2020). Além disso, os cálculos de pseudopotenciais e de bases atômicas numéricas localizadas baseados na Teoria do Funcional da Densidade (Density Functional Theory -DFT) também são bastante úteis para descrever o fenômeno (AHMAD et al, 2020).…”

Assessment and treatment of floodwater in the Vietnamese Mekong Delta using a simple filter system based on silver nanoparticles coated onto activated carbon derived from rice husk

“…In fact, AC made from rice husk exhibits high effectiveness in the treatment of not only organic compounds, [11][12][13] but also heavy metals. 14,15 As mentioned above, oodwater is a suitable residence for microorganisms, particularly disease bacteria. In addition to the pollutants and organic substances, the ingredient of harmful microorganisms in oodwater is necessary for treatment.…”

“…In fact, AC made from rice husk exhibits high effectiveness in the treatment of not only organic compounds, 11–13 but also heavy metals. 14,15 …”