Determination of point of zero charge of natural organic materials

被引:280
作者
Bakatula, Elisee Nsimba [1 ,2 ]
Richard, Dominique [1 ,2 ]
Neculita, Carmen Mihaela [3 ]
Zagury, Gerald J. [1 ,2 ]
机构
[1] RIME, Montreal, PQ, Canada
[2] Ecole Polytech, Dept Civil Geol & Min Engn, Montreal, PQ H3C 3A7, Canada
[3] Univ Quebec Abitibi Temiscamingue, RIME, Rouyn Noranda, PQ J9X 5E4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Point of zero charge; Point of zero net charge; Isoelectric point; Salt addition method; Ion adsorption method; Cation exchange capacity; Zeta potential; Organic materials; SURFACE-CHARGE; AQUEOUS-SOLUTIONS; MODIFIED SAWDUST; VARIABLE CHARGE; HEAVY-METALS; ADSORPTION; PH; BIOSORPTION; EQUILIBRIUM; REMOVAL;
D O I
10.1007/s11356-017-1115-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study evaluates different methods to determine points of zero charge (PZCs) on five organic materials, namely maple sawdust, wood ash, peat moss, compost, and brown algae, used for the passive treatment of contaminated neutral drainage effluents. The PZC provides important information about metal sorption mechanisms. Three methods were used: (1) the salt addition method, measuring the PZC; (2) the zeta potential method, measuring the isoelectric point (IEP); (3) the ion adsorption method, measuring the point of zero net charge (PZNC). Natural kaolinite and synthetic goethite were also tested with both the salt addition and the ion adsorption methods in order to validate experimental protocols. Results obtained from the salt addition method in 0.05 M NaNO3 were the following: 4.72 +/- 0.06 (maple sawdust), 9.50 +/- 0.07 (wood ash), 3.42 +/- 0.03 (peat moss), 7.68 +/- 0.01 (green compost), and 6.06 +/- 0.11 (brown algae). Both the ion adsorption and the zeta potential methods failed to give points of zero charge for these substrates. The PZC of kaolinite (3.01 +/- 0.03) was similar to the PZNC (2.9-3.4) and fell within the range of values reported in the literature (2.7-4.1). As for the goethite, the PZC (10.9 +/- 0.05) was slightly higher than the PZNC (9.0-9.4). The salt addition method has been found appropriate and convenient to determine the PZC of natural organic substrates.
引用
收藏
页码:7823 / 7833
页数:11
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