English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In this study, biosorption processes performed with and without ultrasound-assisted were presented for the first time comparatively. For this purpose, the potential for use of  Ulva lactuca  Linnaeus 1753 ( U. lactuca ) which is a macroalgae, as an alternative biosorbent was investigated for Hg(II) removal from aqueous solutions. Both conventional univariate and multivariate methods were evaluated to optimise biosorption processes. Biosorption equilibrium time was determined as 60 min for without ultrasound-assisted method, while it was only 3 min for ultrasound-assisted method. Biosorption processes were optimised by Central Composite Design (CCD) and successfully described by quadratic polynomial models as a function both of R ( % ) and  q e (mg/g). In optimum conditions (Co = 125 mg/L, m = 30 mg, pH = 4.0 for ultrasound-assisted method and pH = 2.0 for without ultrasound-assisted method), removal efficiencies were achieved experimentally as 95.8 %  ± 0.2 and 96.1 %  ± 0.7 (N = 2), respectively. Models with high regression coefficients ( R2 (adj) &gt; 95 % ) obtained from Response Surface Methodology (RSM) were found to be applicable to the estimation of biosorption data. Biosorption equilibrium data was defined by Langmuir model. Langmuir’s maximum sorption capacity was increased from 125.6 to 232.0 mg/g when ultrasound-assisted method was applied. According to the results of kinetics evaluation, both biosorption processes were thermodynamically possible, endothermic (Δ H º&gt;0) and spontaneous reactions (Δ G º&lt;0) controlled by chemisorption based on the pseudo-second-order kinetic models. Results showed that ultrasound-assistance to the biosorption process contributed positively to increasing the rate of reaction and allowing sorption to be completed in a shorter time by facilitating sorption mass transfer.

international journal of environmental analytical chemistry

Sorptive performance of marine algae ( Ulva lactuca Linnaeus , 1753) with and without ultrasonic-assisted to remove Hg(II) ions from aqueous solutions: optimisation, equilibrium and kinetic evaluation