Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

“…(2016) [1][2][3][4][5][6][7][8][9][10][11][12][13] www.deswater.com doi: 10.1080/19443994.2015.1130655 poisoning typically results from the ingestion of contaminated food or water and can cause a variety of symptoms, especially in children, depending on the duration of Pb exposure [2,3]. Damage to liver and kidney, anemia, mental retardation, depression, increase in blood pressure, nausea, infertility, abdominal pain, fatigue, problems with sleep, headaches, stupor, slurred speech, and loss of coordination are some reported symptoms of chronic Pb poisoning [2,3].…”

“…To date, different types of natural and synthetic sorbents including clay minerals (e.g. bentonite, palygorskite, and kaolinite) [9][10][11], multi-walled carbon nanotubes [12], mercapto-functionalized sepiolite [13], zeolitenanoscale zero-valent iron composite [14], 8-hydroxy quinoline-immobilized bentonite [15], N-methylimidazole-modified palygorskite [16], as well as various biosorbents [17,18], and polymers [19][20][21] have been used for removing of metals from aqueous solutions.…”

“…A series of such conical centrifuge test tubes were then shaken at a constant speed of 180 rpm. Samples were collected at predetermined time intervals (10,30,60,120,240,480,960, and 1,440 min), centrifuged and the supernatants were analyzed for Pb concentration using the AAS.…”

Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central Slovakia

“…Based on the R 2 values, the Freundlich model is better applicable for adsorption of Pb 2+ and Cd 2+ while lower uptake of Cu 2+ and Zn 2+ is better described by the Langmuir model. (Fan et al 2009). …”

“…Sari et al (2007) calculated changes in thermodynamic parameters, such as Gibbs free energy, enthalpy and entropy. The results showed that adsorptions of Pb 2+ and Cr 3+ on clay were feasible, spontaneous and exothermic processes in nature (Fan et al 2009). Clays could be modified to improve their sorption capacity (e.g.…”