EXPERIMENTAL RESULTS OF ADSORPTION OF Ni (II) FROM WASTEWATER USING COFFEE HUSK BASED ACTIVATED CARBON

Abstract

In recent years, the studies on finding the low cost methods to remove metal ions have been increased. Use of agricultural wastes such as coffee husk, coffee residue, coconut fiber, rice husk, peanut shells, cob, etc. as adsorbents to remove heavy metals, pollutants in wastewater has been of great concern in Viet Nam and regional countries. The results showed that the material from coffee husk had superior adsorption. In this study, the coffee husk was heated in Ar gas at temperatures of 300 oC, 400 oC, 500 oC, 600 oC for 30 minutes, 60 minutes and 90 minutes, then was denatured by impregnation with HNO3 at different concentrations (1M, 3M, 5M). The adsorbent products from the above process from coffee husk were tested to find the best technical solution by studying the influences of pH (2 ÷ 9), contact time (10 ÷ 100 min), adsorbent dose (0.2 ÷ 10 g/L) and initial concentration Ni(II) (10 ÷ 60 mg/L). The research results showed that while the activated carbon samples treated at 400 oC in 30 minutes had Ni (II) adsorption capacity of 1.97 mg/g, the activated carbon by HNO3 had Ni (II) adsorption higher capacity, maximum adsorption capacity is 21.14 mg/g (more than 10 times in comparison with the non-denatured or non-modified coal).

Adsorption of Ag+ ions using hydroxyapatite powder and recovery silver by electrodeposition

“…In Vietnam, some materials were synthesized to remove heavy metal ions such as: coffee husk, MnFe 2 O 4 /GNPs composite and chitosan/graphene oxide/magnetite nanostructured (CS/Fe 3 O 4 /GO) composite. [9][10][11] The adsorption capacity for Ni(II) of coffee husk is 21.14 mg/g, reported by Do Thuy Tien et al [9] The CS/Fe 3 O 4 /GO can remove 60 % of Fe(III) with adsorption capacity of 6.5 mg/g. [11] Nguyen…”

A química além da teoria

“…Vários estudos têm sido realizados para analisar a eficiência e os mecanismos de adsorção de carvão ativado produzido a partir de diferentes fontes orgânicas residuárias, tal como o coco verde (Júnior, 2002), a serragem de eucalipto (Couto, 2009), a casca de tangerina (Pavan et al, 2007), a casca de arroz (Reis et al, 2015) e a palha de café (Rodriguez et al, 2018;Tien et al, 2018;Cruz et al, 2019).…”

Estudo da argila KSF e KSF impregnada com zinco visando reações de dessulfurização via craqueamento catalítico

“…Vários estudos têm sido realizados para analisar a eficiência e os mecanismos de adsorção de carvão ativado produzido a partir de diferentes fontes orgânicas residuárias, tal como o coco verde (Júnior, 2002), a serragem de eucalipto (Couto, 2009), a casca de tangerina (Pavan et al, 2007), a casca de arroz (Reis et al, 2015) e a palha de café (Rodriguez et al, 2018;Tien et al, 2018;Cruz et al, 2019).…”