Preparation of Amorphous Calcium Phosphate (ACP) by Precipitation Method at Low Temperature and Its Application in the Removal of Congo Red (CR)

ChemistrySelect, Год журнала: 2025, Номер 10(15)

Опубликована: Апрель 1, 2025

Abstract To tackle Congo red contamination in dye wastewater, this study undertook the modification of ACP by adding β‐cyclodextrin (β‐CD), citric acid (CA), and polyethylene glycol (PEG), with objective augmenting its adsorption efficiency for (CR). Adsorption experiments were performed based on various factors, such as initial concentration, solution pH, temperature, contact time. The results demonstrated that β‐CD‐ACP had excellent properties could quantitatively remove from wastewater a wide pH value (3 − 10). When concentration is 2000 mg L −1 , maximum capacity CR has reached 662.47 g . experimental data more consistent pseudo‐second‐order kinetic model Langmuir isotherm model. thermodynamic parameters indicated was spontaneous endothermic process. Moreover, internal diffusion revealed linear relationship, suggesting played role onto involves hydrogen bonding, ion‐exchange mechanism PO 4 3− chelation effect Ca 2+ we prepared exhibits performance recyclability, demonstrating great potential removing wastewater.

Язык: Английский

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A solid acid derived from fishbone catalyzes the hydrolysis of cellulose into nanocellulose

International Journal of Biological Macromolecules, Год журнала: 2024, Номер 275, С. 133903 - 133903

Опубликована: Июль 31, 2024

Язык: Английский

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Soil Heavy Metal(loid) Pollution Evaluation, Risk Assessment, and Source Analysis of a Mineral Processing Plant

Sustainability, Год журнала: 2024, Номер 16(12), С. 5271 - 5271

Опубликована: Июнь 20, 2024

Yunnan Province is rich in mineral resources. Early mining, processing, metallurgy, and other mining activities produce three industrial wastes (waste water, waste gas, residue) causing environmental pollution. Considering the legacy site of a processing plant as research object, 21 sampling points study area 12 control periphery were set up to determine contents heavy metal(loid)s As, Hg, Cd, Cu, Ni, Pb, Cr soil. The spatial distribution was interpolated analyzed using Arcmap10.8, combined with single-factor index, Nemero Comprehensive Pollution Index, health risk assessment method for metal(loid) pollution status soil evaluated. acidic, largest average value elemental As percentages screening values. results composite index showed following trend: > Pb Cd Cu Ni Hg. mainly originate from metallurgy Hg combustion fossil fuels, while soil-forming substrates are main sources Ni. by most prominent element, whereas some areas also cannot be ignored prevent negative impacts on residents. It recommended remediate treat public events; therefore, this fills gap studying potential ecological risks, human assessments, exposure (oral ingestion, respiratory dermal contact).

Язык: Английский

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“Treating Waste with Waste”: Utilizing Phosphogypsum to Synthesize Porous Calcium Silicate Hydrate for Recovering of Fe2+ from Pickling Wastewater

Sustainability, Год журнала: 2024, Номер 16(17), С. 7796 - 7796

Опубликована: Сен. 6, 2024

Phosphogypsum is a by-product of the wet-process phosphoric acid production, and it rich in Ca S. Long-term storage can cause serious pollution to environment; therefore, promoting sustainable utilization crucial. This study proposes use silicic sodium hydroxide solution for hydrothermal synthesis porous calcium silicate hydrate adsorbent, which used adsorbing Fe2+ from simulated hydrochloric pickling wastewater. Under optimal conditions (37.5 g/L NaOH, calcium/silicon ratio 1.0, liquid/solid 15:1 mL/g, 110 °C, 4 h), conversion rate SO42− 87.41%. Porous exhibits excellent OH− release capability Fe2+-containing The adsorption process Fe2+; mainly chemical adsorption, involving ion exchange between Ca2+ Fe2+, as well complexation reactions O-Si-O group, -OH Si-O group with Fe2+. technology aims provide recovery wastewater, has significant practical importance.

Язык: Английский

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Heavy Metal Pollution and Solutions for Its Control: General Aspects with a Focus on Cobalt Removal and Recovery from Aqueous Systems

ChemEngineering, Год журнала: 2024, Номер 8(6), С. 118 - 118

Опубликована: Ноя. 18, 2024

Heavy metal pollution is a worldwide and stringent concern following many decades of industrialization intensive mining without (in some cases) consideration for environmental protection. This review aims to identify the existing emerging techniques heavy metals (HM) removal/recycling from water wastewater, with an emphasis on cobalt. Unlike other metals, cobalt has not been considered detrimental element environment human beings until recently. Thus, several methods applicable were evaluated best treatment approaches cobalt-polluted wastewater. The most feasible depollution adapted source, environment, economic conditions investigated concluded. operations processes presented in this paper are conventional innovative as well, including precipitation, membrane separation, ultrafiltration (UF) nanofiltration (NF), but also reverse osmosis/forward osmosis (RO/FO), sorption/chemisorption processes, flotation/mechanical separation combined coagulation/flocculation, photocatalysis, electrochemical processes. For each one, depending frequency use, physicochemical mechanisms optimal operational identified carry out successful removal recovery aqueous environments.

Язык: Английский

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In-situ synthesis of silicic acid-encapsulated iron hydroxyphosphate for the removal of Cd(II), Pb(II), Cu(II), and Zn(II) from aqueous solutions: Material design and mechanistic insights

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 159037 - 159037

Опубликована: Дек. 1, 2024

Язык: Английский

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