Green walnut shell as a new material for removal of Cr(VI) ions from aqueous solutions

被引:22
作者
Zafarani, Hamid Reza [1 ]
Bahrololoom, Mohammad Ebrahim [1 ]
Noubactep, Chicgoua [2 ,3 ]
Tashkhourian, Javad [4 ]
机构
[1] Shiraz Univ, Sch Engn, Dept Mat Sci & Engn, Shiraz 71454, Iran
[2] Univ Gottingen, Angew Geol, D-37073 Gottingen, Germany
[3] Kultur & Nachhaltige Entwicklung CDD eV, D-37005 Gottingen, Germany
[4] Shiraz Univ, Coll Sci, Dept Chem, Shiraz 71454, Iran
关键词
Low-cost biomass; Adsorption kinetics; Chromium removal; Green walnut shell; Bioreduction; ELECTROPLATING WASTE-WATER; DEAD FUNGAL BIOMASS; LOW-COST ADSORBENTS; HEXAVALENT CHROMIUM; AGRICULTURAL WASTE; ACTIVATED CARBON; INDUSTRIAL-WASTE; HEAVY-METALS; ADSORPTION; BIOSORPTION;
D O I
10.1080/19443994.2014.917986
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The removal of aqueous hexavalent chromium (Cr(VI)) by green walnut shell (GWS) was investigated in batch experiments. GWS is a readily available and low-cost horticulture solid waste. The efficiency of this biomass for Cr(VI) removal as impacted by various operational parameters was characterized. Tested parameters are: initial solution pH (pH(0)), initial GWS mass loading ([GWS] (g L- 1)), contact time (t (min)), GWS particle size (d (mu m)), initial Cr(VI) concentration ([Cr(VI)](0) (mg L- 1)), and ionic strength (I(M)). Results revealed that Cr(VI) chemical reduction (to Cr(III)) followed by adsorption or surface precipitation is the removal mechanism. The optimal operational conditions for Cr(VI) removal from 50 mL of a [Cr(VI)](0) = 10 mg L-1 solution were: pH(0) = 3.6, t = 5 min, [GWS] = 6 g L-1, and I = 0.1 M. The corresponding removal efficiency was 95%. The kinetic of the reaction was also studied. Results indicate that using GWS is an affordable, efficient, and applicable method for aqueous Cr(VI) removal and thus a low-cost material for water treatment.
引用
收藏
页码:431 / 439
页数:9
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