School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, PR China.
Yangtze Ecology and Environmental Co., Ltd. Wuhan, Hubei 434000, PR China.
J Hazard Mater. 2021 Apr 15;408:124860. doi: 10.1016/j.jhazmat.2020.124860. Epub 2020 Dec 17.
Cadmium (Cd) pollution is regarded as a disturbing environmental problem due to its serious risks to the water body and human health. The removal of cadmium from wastewater is thus crucial to avoid its harmful effects on the ecosystem. This study comprehensively investigated Cd(II) adsorption onto MgCl modified biochar (MgC600) and results showed that the adsorption capacity of MgC600 was more than twice of that of pristine biochar due to its enhanced ion exchange ability. Response surface analysis revealed that reaction time played a crucial role in the Cd(II) adsorption, followed by initial concentration and solution pH. Moreover, the optimal adsorption conditions and capacity were precisely given by the quadratic regression model and thus proved that the model can be applied to predict the operation conditions of Cd(II) adsorption. Finally, a new model defined as BJP model [Formula: see text] was proposed and proved to be more suitable for the fixed bed filtration process. Overall, our findings provide a promising material in treatment of Cd(II)-rich wastewater and give a clear picture of its application. More importantly, the newly developed BJP model can accurately describe the fixed bed filtration process and further promote its application in wastewater treatment.
镉（Cd）污染被认为是一个令人困扰的环境问题，因为它对水体和人类健康存在严重风险。因此，从废水中去除镉对于避免其对生态系统的有害影响至关重要。本研究全面研究了 Cd(II)在 MgCl 改性生物炭（MgC600）上的吸附，结果表明，由于增强了离子交换能力，MgC600 的吸附容量是原始生物炭的两倍多。响应面分析表明，反应时间对 Cd(II)吸附起着至关重要的作用，其次是初始浓度和溶液 pH。此外，二次回归模型精确地给出了最佳吸附条件和容量，从而证明该模型可用于预测 Cd(II)吸附的操作条件。最后，提出了一个新的模型，即 BJP 模型[公式：见文本]，并证明它更适合固定床过滤过程。总的来说，我们的研究结果为处理富含 Cd(II)的废水提供了一种很有前途的材料，并对其应用有了清晰的了解。更重要的是，新开发的 BJP 模型可以准确描述固定床过滤过程，进一步促进其在废水处理中的应用。
