Assessing treatment of lead (Pb II) from industrial wastewater on dried bulbs of water hyacinth: adsorption capacity, isotherm and kinetic study

IF 0.5 Q4 ENGINEERING, ENVIRONMENTAL

International Journal of Environmental Technology and Management Pub Date : 2017-09-13 DOI:10.1504/IJETM.2017.10007533

Tiyasha Kanjilal, C. Bhattacharjee, S. Datta

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引用次数: 2

Abstract

Remediation through aquatic macrophytes treatment system for the removal of noxious contaminants from wastewater is an emerging environmental protection technique. The dried and acid-alkali treated bulbs of water hyacinth (WHB) having high porosity and O2-filled functional groups were utilised to treat Pb(II) from industrial wastewater. Characterisation of WHB with FESEM, XRD and FTIR exhibited the presence of several carboxyls, hydroxyl, ketonic, aldehydes and other O2-filled functional groups showing WHB adsorption with highest monolayer capacity of (Qm) 38.614 mg/g. WHB adsorption directed towards the pseudo-second order kinetics and Langmuir isotherm mechanism. The study also emphasised effective regeneration of WHB using HNO3, NaOH and vacuum dry. The bio-sorption mechanism was observed to be endothermic spontaneous reaction process, with ΔG decreased from -0.71 to -8.53 with increasing temperature. With optimised and controlled process conditions, only 5.0 g L−1 of WHB bio-sorbent could significantly treat about 85.3% of 100 mg L−1 of Pb(II) within 120 minutes at pH 7.0 and 30°C. Also a comparative optimisation study of ANN and RSM were used to predict the WHB bio-sorption bioprocess. Therefore, WHB have efficient potential to be commercially applicable as an environmental-friendly and economical bio-sorbent for treatment of Pb(II) from solutions and effluent from paint industry.

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工业废水中铅（PbII）在水葫芦干球茎上的吸附性能、等温线和动力学研究

通过水生植物处理系统去除废水中的有害污染物是一种新兴的环境保护技术。利用干燥和酸碱处理的具有高孔隙率和充氧官能团的水葫芦球茎（WHB）处理工业废水中的Pb（II）。用FESEM、XRD和FTIR对WHB的表征显示出几种羧基、羟基、酮基、醛和其他O2填充的官能团的存在，显示出WHB吸附的最高单层容量为（Qm）38.614mg/g。WHB吸附趋向于拟二阶动力学和Langmuir等温线机制。该研究还强调了使用HNO3、NaOH和真空干燥对WHB进行有效再生。生物吸附机理为吸热自发反应过程，随着温度的升高，ΔG从-0.71降至-8.53。在优化和受控的工艺条件下，在pH 7.0和30°C下，只有5.0 g L−1的WHB生物吸附剂可以在120分钟内显著处理约85.3%的100 mg L−1 Pb（II）。此外，还使用ANN和RSM的比较优化研究来预测WHB生物吸附生物过程。因此，WHB作为一种环境友好、经济的生物吸附剂，具有有效的商业应用潜力，可用于处理涂料工业溶液和废水中的Pb（II）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Environmental Technology and Management ENGINEERING, ENVIRONMENTAL-

CiteScore

1.00

自引率

0.00%

发文量

期刊介绍： IJETM is a refereed and authoritative source of information in the field of environmental technology and management. Together with its sister publications IJEP and IJGEnvI, it provides a comprehensive coverage of environmental issues. It deals with the shorter-term, covering both engineering/technical and management solutions.