Abstract

The purpose of this study was to examine the sorption properties of low-cost sorbents derived from bark for heavy metals such as copper and cadmium at different pH and ionic strength conditions. Three different bark-derived sorbents such as untreated, acid treated, and alkaline treated barks were prepared. The acid treated and alkali treated barks were obtained through chemical treatments using 0.1 HCl and 0.1 NaOH solutions, respectively. Morphology, elemental composition, and specific surface area of different bark-derived sorbents were characterized by SEM (Scanning Electron Microscopy), EDS (Energy-dispersive X-ray spectroscopy) and BET (Brunauer–Emmett–Teller) specific surface area measurements, respectively. Batch isotherm tests were carried out to examine the sorption properties of bark-derived sorbents. The results showed that alkali treated bark had high affinity for both copper and cadmium. At pH 7.0 sorption capacity of alkali treated bark for copper (1.43 mg/g) was greater than untreated and acid treated barks, which corresponded to a removal efficiency of around 95%. Also, sorption capacity of alkali treated bark for cadmium was greater than the other bark-derived sorbents, which corresponded to removal efficiency of around ~ 98.5%. In case of pH effect, sorption affinity of untreated bark for both copper and cadmium increased with the increase of pH. On the other hand, for ionic strength effect, sorption affinities of three different bark-derived sorbents for copper decreased with increase of ionic strength. Therefore, the alkali treated bark could be a cost-effective sorbent for the removal of heavy metals from water and wastewater.

中文翻译：

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使用源自树皮的吸附剂去除重金属

抽象的

这项研究的目的是研究在不同的pH和离子强度条件下，树皮衍生的低成本吸附剂对重金属（如铜和镉）的吸附性能。制备了三种不同的树皮衍生吸附剂，例如未处理的，酸处理的和碱性处理的树皮。酸处理过的树皮和碱处理过的树皮分别通过使用0.1 HCl和0.1 NaOH溶液的化学处理获得。分别通过SEM（扫描电子显微镜），EDS（能量分散X射线光谱）和BET（Brunauer-Emmett-Teller）比表面积测量来表征不同树皮衍生吸附剂的形态，元素组成和比表面积。 。进行了批量等温线测试，以检查树皮衍生的吸附剂的吸附性能。结果表明，碱处理的树皮对铜和镉均具有高亲和力。在pH 7.0时，碱处理的树皮对铜的吸附能力（1.43 mg / g）大于未处理和酸处理的树皮，其去除效率约为95％。而且，碱处理的树皮对镉的吸附能力大于其他树皮衍生的吸附剂，这相当于约98.5％的去除效率。在pH影响的情况下，未处理的树皮对铜和镉的吸附亲和力随pH的增加而增加。另一方面，对于离子强度效应，三种不同的树皮衍生的吸附剂对铜的吸附亲和力随离子强度的增加而降低。因此，经碱处理的树皮可能是一种从水中和废水中去除重金属的经济有效的吸附剂。