Enhancing lead extraction efficiency from contaminated soil: A synergistic approach combining biodegradable chelators and surfactants.

Lead (Pb), a persistent and bio-accumulative contaminant, poses threats to the environment and human health. The effective removal of Pb from contaminated soil proves challenging due to its tendency to form stable complexes with soil components. Chelators have been extensively studied for their ability to extract metal contaminants, including Pb, from soil environment.

Remediation of fluoride-contaminated wastes: Chelator-assisted washing and subsequent immobilization using CaO and HPO.

Fluoride (F) contamination in industrial waste is a significant challenge for sustainable materials recycling. Existing techniques for mitigating F contamination focus on immobilization, converting F compounds to insoluble forms while leaving the total F content untreated. Chelator-assisted washing is considered a promising alternative remediation strategy that can indirectly release F by entrapping and dissolving F-bearing minerals.

The behaviour of particulate trace metals in marine systems: A review.

Changes in the ocean temperature, seawater acidity, and oxygen level are parts of global change that may indirectly impact the biogeochemical cycles of trace metals in the marine system, particularly for the particulate phase. The different factors influencing the level of particulate trace metals are interesting topics for investigation. Following up on marine research in the estuary and coastal areas, we specifically review the distribution of particulate trace metals.

Remediation of cadmium-contaminated soil: GLDA-assisted extraction and sequential FeCl-CaO-based post-stabilization.

Cadmium (Cd) contamination of farmland soils is a growing concern because of its highly toxic impact on ecosystems and human health. Chelator-assisted washing and chemical immobilization are effective remediation strategies for Cd-contaminated soils. Ethylenediaminetetraacetic acid (EDTA) has traditionally been used for soil washing, but its persistence in the environment and subsequent toxicity have raised significant ecological concerns.

Evaluation of newly designed flushing techniques for on-site remediation of arsenic-contaminated excavated debris.

Excavated debris (soil and rock) contaminated with geogenic arsenic (As) is an increasing concern for regulatory organizations and construction stakeholders. Chelator-assisted soil flushing is a promising method for practical on-site remediation of As-contaminated soil, offering technical, economic, and environmental benefits. Ethylenediaminetetraacetic acid (EDTA) is the most prevalent chelator used for remediating As-contaminated soil.

Insight into stability of dithiocarbamate-modified adsorbents: Oxidation of dithiocarbamate.

We previously reported that monoalkyl dithiocarbamate-modified cellulose (DMC) exhibited excellent adsorption performance for arsenite (As), cadmium (Cd), lead (Pb), gold (Au), silver (Ag), platinum (Pt), and palladium (Pd). However, its adsorption capability for As decreased by 96.4% after two weeks of storage at 40 °C under an air atmosphere.

Revisiting the Synthesis of Cellulose Acrylate and Its Modification via Michael Addition Reactions.

The synthesis of cellulose acrylate from cellulose with acryloyl chloride has been problematic due to unexpected gelation of the reaction mixture, but we discovered that the use of bulky amines was crucial for the reproducibility of the synthesis of cellulose acrylate. The solubility of the obtained cellulose acrylate depended on the reaction conditions due to the possible cross-linking oxa-Michael reaction between a remaining hydroxy group and the introduced acrylate group. The synthesized cellulose acrylate worked as a useful precursor of chemically modified cellulose materials because it reacted with various functionalized nucleophiles such as secondary amines and thiols as a Michael donor.

Element pattern in two dominant species of seaweed from Betsukari coastline - Mashike, Hokkaido, Japan.

The present study investigated the monthly of element accumulation in seaweeds. Patterns of As, Ba, Cd, Cu, Fe, Mn, Pb, and Zn concentrations in dominant species of Phaeophyceae and Rhodophyceae, namely Saccharina japonica and Pterocladiella tenuis respectively, collected from the Betsukari coastline-Mashike, Hokkaido, Japan, were investigated. Our results indicated that element accumulation was more related to specific seaweed species than to their supply in seawater concentration.

Cross-linked dithiocarbamate-modified cellulose with enhanced thermal stability and dispersibility as a sorbent for arsenite removal.

Numerous reports have described dithiocarbamate (DTC)-modified cellulose sorbents that can selectively separate metal ions from water. We have previously synthesized a novel sorbent modified with DTC containing N-heterocycles in the backbone for the selective removal of hazardous metal ions. The sorbent was found to partially dissolve and aggregate in solution, reducing its sorption capacity.

Enhanced remediation of arsenic-contaminated excavated soil using a binary blend of biodegradable surfactant and chelator.

The reclamation of geogenic As-contaminated excavated soils as construction additives can reduce the post-disposal impact on the ecosystem and space. Although retaining soil characteristics while reducing contaminant load is a challenging task, washing remediation with biodegradable surfactants or chelators is a promising alternative to non-biodegradable counterparts. In this study, newly synthesized biodegradable surfactants (SDG: sodium N-dodecanoyl-glycinate, SDBA: sodium N-dodecanoyl-β-alaninate, SDGBH: sodium N-dodecanoyl-α,γ-glutamyl-bis-hydroxyprolinate, SDT: sodium N-dodecanoyl-taurinate, and DCPC: N-dodecyl-3-carbamoyl-pyridinium-chloride) and biodegradable chelators (EDDS: ethylenediamine N,N'-disuccinic acid, GLDA: L-glutamate-N, N'-diacetic acid, and HIDS: 3-hydroxy-2,2'-imino disuccinic acid) are evaluated for the remediation of As-contaminated soil.

Speciation analysis of inorganic selenium in wastewater using a highly selective cellulose-based adsorbent via liquid electrode plasma optical emission spectrometry.

Speciation of selenium (Se) is typically carried out using a sophisticated technique such as ICP-MS after preconcentration using an adsorbent; however, the separation and preconcentration of inorganic Se has not been realized in the solutions containing high concentrations of SO. A dithiocarbamate-modified cellulose (DMC) was used in this study for the selective extraction and preconcentration of inorganic Se in wastewater, with a portable liquid electrode plasma-optical emission spectrometry (LEP-OES) being employed for quantification. DMC was found to selectively and quantitatively adsorb selenite (Se) over a wide range of pH (1.