Adsorptive recovery of vanadium(V) from chromium(VI)-containing effluent by Zr(IV)-loaded orange juice residue
Adsorptive recovery of vanadium(V) from chromium(VI)-containing effluent by Zr(IV)-loaded orange juice residue
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DOI：
10.1016/j.cej.2014.03.029
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发表时间：
2014-07-15
影响因子：
15.1
通讯作者：
Liu, Huizhou
中科院分区：
文献类型：
--
作者：
Hu, Qiaoyu;Paudyal, Had;Liu, Huizhou
以干橙子汁渣为原料，通过化学负载锆（IV），将其转化为经济环保的吸附剂。研究了其对模拟废水和实际废水中钒（V）和铬（VI）的吸附性能。V（V）的吸附强烈地依赖于溶液的pH，并且V（V）和Cr（VI）之间的最大分离系数（β（V/Cr）= 45）发生在pH 2.85处。OH-与金属含氧阴离子之间的阴离子交换或亲核取代反应被认为是主要的吸附机理。Langmuir吸附和伪二级速率方程可以很好地描述V（V）在凝胶上的吸附。对V（V）和Cr（VI）的最大吸附容量分别为1.003和0.288 mmol/g。吸附的钒有效地解吸使用稀NaOH溶液。共存阴离子如硝酸盐和氯化物的干扰可忽略不计，凝胶的耐久性、再现性以及通过V（V）和Cr（VI）的混合物随后洗脱的柱吸附测试使得Zr（IV）-SOW成为从含铬（VI）的废水中回收少量钒的有前景的吸附剂。最后，初步尝试了使用本凝胶从含有Cr（VI）的真实的稀工业废水中选择性富集V（V），并证实成功实现。(c)2014爱思唯尔有限公司版权所有。
Dried orange juice residue marketed as cattle food was converted into an economical and environmentally benign sorbent through chemical loading with zirconium(IV). Its adsorption properties for vanadium(V) and chromium(VI) from synthetic and actual waste water were investigated. The adsorption of V(V) is strongly dependent on solution pH, and the maximum separation coefficient (beta(V/Cr) = 45) between V(V) and Cr(VI) takes place at pH 2.85. The anion exchange or nucleophilic substitution reaction between OH- and metal oxo-anions was proposed as the main adsorption mechanism. Langmuir adsorption and pseudo-second-order rate equations can describe well the adsorption of V(V) onto the gel. The maximum adsorption capacities for V(V) and Cr(VI) were estimated as 1.003 and 0.288 mmol/g, respectively. The adsorbed vanadium was effectively desorbed using a diluted NaOH solution. The negligible interference of coexisting anions, such as nitrates and chlorides, durability, reproducibility of the gel, and the column adsorption test through the mixture of V(V) and Cr(VI) followed by elution make the Zr(IV)-SOW a promising sorbent for the recovery of a small quantity of vanadium from chromium(VI)containing effluent. Finally, a preliminary attempt to selectively enrich V(V) from the real dilute industrial effluent that contains Cr(VI) using the present gel has been carried out, and it was confirmed to be successfully achieved. (c) 2014 Elsevier B.V. All rights reserved.