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首页> 外文期刊>Frontiers of environmental science & eng >Experimental determination of Cd~(2+) adsorption mechanism on low-cost biological waste
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Experimental determination of Cd~(2+) adsorption mechanism on low-cost biological waste

机译：低成本生物废料对Cd〜（2+）吸附机理的实验确定

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摘要

Carbonate shells have an astonishing ability in the removal of Cd~(2+) in a short time period with emphasis on being a low cost adsorbent. In the present study, the sorption capacity of carbonate shells was studied for Cd~(2+) in batch experiments. The influence of different carbonate shell sizes and physico-chemical factors were evaluated and the results were analyzed for its correlation matrices by using Predictive Analytics Software (PASW). The mineralogy state of aqueous solution regarding the saturation index was simulated using PHREEQC to identify the Cd~(2+) uptake mechanism. The Cd uptake rates were calculated as well as Ca~(2+), HCO_3~- concentration, pH, ambient humidity and temperature were measured. Cd~(2+) removal of 91.52% was achieved after 5 h adsorption. The adsorption efficiencies were significantly influenced by pH as they increased with the increase of pH from acidic solution (5.50±0.02) to slightly alkaline (7.60±0.05). In addition, the mineralogy state of aqueous solution calculated from PHREEQC confirmed that the increment of Ca~(2+) and HCO_3~- concentrations in solution was attributed to the dissolution of carbonate shells. Moreover, the ion exchange adsorption mechanism of Cd~(2+) toward Ca~(2+) was identified as the process involved in Cd~(2+) uptake.
机译：碳酸盐壳具有在短时间内去除Cd〜（2+）的惊人能力，重点是作为低成本的吸附剂。在本研究中，分批实验研究了碳酸盐壳对Cd〜（2+）的吸附能力。评估了不同碳酸盐壳大小和理化因素的影响，并使用Predictive Analytics软件（PASW）对结果进行了相关矩阵分析。利用PHREEQC模拟了水溶液中与饱和度有关的矿物学状态，确定了Cd〜（2+）的吸收机理。计算了镉的吸收率以及Ca〜（2 +），HCO_3〜-浓度，pH，环境湿度和温度。吸附5h后，去除Cd〜（2+）达到91.52％。 pH值随着从酸性溶液（5.50±0.02）到弱碱性（7.60±0.05）的增加而增加，吸附效率受到pH的显着影响。此外，由PHREEQC计算得出的水溶液的矿物学状态证实了溶液中Ca〜（2+）和HCO_3〜-浓度的增加与碳酸盐壳的溶解有关。此外，Cd〜（2+）对Ca〜（2+）的离子交换吸附机理被认为是Cd〜（2+）吸收的过程。

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