Removal of Heavy Metal Ions Using Modified Celluloses Prepared from Pineapple Leaf Fiber

Abstract

Since large amounts of pineapple leaves are abandoned after harvest in agricultural areas, the possibility of developing value-added products from them is of interest. In this work, cellulose fiber was extracted from pineapple leaves and modified with ethylenediaminetetraacetic acid (EDTA) and carboxymethyl (CM) groups to produce Cell-EDTA and Cell-CM, respectively, which were then used as heavy metal ion adsorbents. A solution of either lead ion (Pb 2+ ) or cadmium ion (Cd 2+ ) was used as wastewater for the purpose of studying adsorption efficiencies. The adsorption efficiencies of Cell-EDTA and Cell-CM were significantly higher than those of the unmodified cellulose in the pH range 1−7. Maximum adsorptions toward Pb 2+ and Cd 2+ were, for Cell-EDTA, 41.2 and 33.2 mg g −1 , respectively, and, for Cell-CM, 63.4 and 23.0 mg g −1 , respectively. The adsorption behaviors of Cell-CM for Pb 2+ and Cd 2+ fitted well with a pseudo-first-order model, but those of Cell-EDTA for Pb 2+ and Cd 2+ fitted well with a pseudo-second-order model. All of the adsorption behaviors could be described using the Langmuir adsorption isotherm. Desorption studies of Pb 2+ and Cd 2+ on both adsorbents using 1 M HCl suggested that regenerability of Cell-EDTA was, for both adsorbates, better than that of Cell-CM. Moreover, adsorption measurements in a mixture of Pb 2+ and Cd 2+ at various ratios showed that for both adsorbents the adsorption of Pb 2+ was higher than that of Cd 2+ , while the adsorption selectivity for Pb 2+ of Cell-CM was greater than that of Cell-EDTA. This study showed that the modified cellulosic adsorbents made from pineapple leaves were able to efficiently adsorb metal ions.

3D-Printable Nanocellulose-Based Functional Materials: Fundamentals and Applications

“…Functionalization of nanocellulose can be done depending on the type of contaminant. Typical procedures include adding carboxyl-, amino-, or thiourea-using chemical modifiers such as ethylenediaminetetraacetic acid (EDTA) or carboxymethyl groups to enhance heavy metal adsorption [ 61 ]. While applications of nanocellulose for heavy metal ion and other contaminants adsorption have been reported, the use of 3D printing to create systems such as filters and membranes for water purification remains largely unexplored.…”

An amiRNA screen uncovers redundant CBF and ERF34/35 transcription factors that differentially regulate arsenite and cadmium responses

“…The nrt1.8 knock out mutant accumulates cadmium in shoots and has a similar root sensitivity to cadmium (Li et al, 2010) as the erf34/35 double mutant (Figure 5). However, additional experiments are needed to confirm this hypothesis, as additional CBF/ERF targets are also likely involved, including possible effects of ERF35 on cell wall synthesis (Sakamoto et al, 2018;Daochalermwong et al, 2020). Arsenate (As(V) can be transported by inorganic phosphate (Pi) transporters due to its chemical similarity to phosphate.…”

Carbohydrate biopolymers, lignin based adsorbents for removal of heavy metals (Cd2+, Pb2+, Zn2+) from wastewater, regeneration and reuse for spent adsorbents including latent fingerprint detection: A review

“…The selectivity of Pb 2+ was better with Cell-CM adsorbent than Cell-EDTA. The modified cellulose adsorbents increased the adsorption of the heavy metals Pb 2+ and Cd 2+ [ 45 ].…”

“…Cellulose is present in Plants leaves, cotton, wood and is an easily accessible low cost material. Cellulose based nanocomposites have shown good adsorption for the removal of heavy metal ions and chelation from water samples [ 15 ]. Cellulose based composites and nanocomposite materials were mostly used in wastewater treatment to minimize the influence of heavy metals in water.…”