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使用聚电解质包覆的工业废粉煤灰去除污水中的镉

Cadmium Removal from Contaminated Water Using Polyelectrolyte-Coated Industrial Waste Fly Ash.

作者信息

Olabemiwo Fatai A, Tawabini Bassam S, Patel Faheemuddin, Oyehan Tajudeen A, Khaled Mazen, Laoui Tahar

机构信息

Geosciences Department, College of Petroleum & Geosciences, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia.

Mechanical Engineering Department, KFUPM, Dhahran 31261, Saudi Arabia.

出版信息

Bioinorg Chem Appl. 2017;2017:7298351. doi: 10.1155/2017/7298351. Epub 2017 Jun 7.

DOI:10.1155/2017/7298351
PMID:28680373
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5478888/
Abstract

Fly ash (FA) is a major industrial waste generated from power stations that add extra cost for proper disposal. Recent research efforts have consequently focused on developing ways to make use of FA in environmentally sound applications. This study, therefore, investigates the potential ability of raw fly ash (RFA) and polyelectrolyte-coated fly ash (PEFA) to remove cadmium (Cd) from polluted water. Using layer-by-layer approach, functionalized fly ash was coated with 20 layers from 0.03% (v/v) of cationic poly(diallyldimethylammonium chloride) (PDADMAC) and anionic polystyrene sulfonate (PSS) solutions. Both surface morphology and chemical composition of the adsorbent (PEFA) were characterized using Field-Emission Scanning Electron Microscope (FE-SEM), X-Ray Diffraction (XRD), Fourier-Transform Infrared (FTIR), and X-Ray Fluorescence (XRF) techniques. The effects of pH, adsorbent dosage, contact time, initial contaminant concentration, and mixing rate of the adsorption of Cd were also studied in batch mode experiments. Results of the study revealed that a 4.0 g/L dosage of PEFA removed around 99% of 2.0 mg/L of Cd in 15 min at 150 rpm compared to only 27% Cd removal achieved by RFA under the same conditions. Results also showed that adsorption by PEFA followed both Langmuir and Freundlich models with correlation coefficients of 98% and 99%, respectively.

摘要

粉煤灰（FA）是发电站产生的主要工业废料，其妥善处置会增加额外成本。因此，最近的研究工作集中在开发以环保方式利用粉煤灰的方法。因此，本研究调查了原生粉煤灰（RFA）和聚电解质包覆粉煤灰（PEFA）从污染水中去除镉（Cd）的潜在能力。采用层层包覆法，用0.03%（v/v）的阳离子聚二烯丙基二甲基氯化铵（PDADMAC）和阴离子聚苯乙烯磺酸盐（PSS）溶液对功能化粉煤灰进行20层包覆。使用场发射扫描电子显微镜（FE-SEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和X射线荧光光谱（XRF）技术对吸附剂（PEFA）的表面形态和化学成分进行了表征。还通过间歇模式实验研究了pH值、吸附剂用量、接触时间、初始污染物浓度和混合速率对Cd吸附的影响。研究结果表明，在150转/分钟的转速下，4.0 g/L剂量的PEFA在15分钟内去除了2.0 mg/L Cd中的约99%，而在相同条件下RFA仅去除了27%的Cd。结果还表明，PEFA的吸附符合Langmuir模型和Freundlich模型，相关系数分别为98%和99%。

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