Abstract Acid treated spent bleaching earth was prepared by treating earth, a waste material from the palm oil industry, with 20% sulphuric acid and heated at 350°C for three hours. This can efficiently sorb variety of organic dyes especially reactive dyes, maximum sorption capacity in order 2–300 mg g−1. The applicability both Langmuir Freundlich isotherms to experimental data indicates that physicosorption chemisorption were involved process. Keywords: earthreactive dyesacid dyessorption

Abstract The potential of chrome sludge, a waste product from the electroplating industries, to remove colour aqueous solutions was investigated. Results indicated that sludge had better affinity for acid than basic dyes. Equilibrium data can be fitted into Langmuir isotherm with maximum sorption 30 – 60 mg g−1 range dyes studied. process followed first order rate kinetics and dye removal influenced by concentration agitation speed. Keywords: sludgedyesadsorptionagitation

Abstract The sorption characteristics of Cr(VI) and Cu(II) by ethylenediamine modified rice hull from single binary metal ion solutions were evaluated under various experimental conditions. Optimal removal occurred at pH 2.0 5.5, respectively. Simultaneous greater than 3.0. kinetics studied with reference to concentration, agitation rate particle size. Sorption was more rapid Cu(II). fitted a pseudo‐second order expression. variation in the initial uptake rates very small an beyond 150 rpm...

Abstract Biomass of non‐living dried water hyacinth roots, Eichhornia crassipes, showed high sorption for copper from aqueous solutions. Maximum was 20.90 mg Cu/g as determined Langmuir isotherm. Several factors affecting were investigated. They include effect pH, initial concentrations, presence chelators and other metals. The feasibility removing electroplating waste using this material in a packed‐bed system also discussed.

Abstract Studies were carried out to assess the capability of a moss, Calymperes delessertii Besch, remove copper from solution. Both batch and column experiments performed, taking into account such parameters as pH, sorbent dosage, concentration, presence other metal ions, temperature, contact time, height flow'rate. The results show that moss is an efficient for removal mechanism mainly ion‐exchange process.

This study comparatively examines the determinants of yield spreads for Sukuk and conventional bonds, with a particular focus on role firms’ environmental, social, governance (ESG) performance. Using dataset comprising 744 bond-year observations from issuers in countries prominent dual financial systems—namely, Saudi Arabia, UAE, Turkey, Malaysia, Indonesia—over period 2008 to 2022, this analysis identifies distinct mechanisms that influence these asset classes. For robustness, sample...

Abstract The potential of an aquatic plant, Hydrilla verticillata, to remove two basic dyes, methylene blue and blue, from aqueous solutions was assessed under various experimental conditions. Results showed that dried able the dyes efficiently rapidly. Its breakthrough time flow conditions could be predicted using Hutchin's bed depth‐service (BDST) model. As is readily available, it represent a cheap source biosorbent for dyes.

Abstract The potential of using quaternized rice husk (QRH) as a sorbent for the removal As(V) from aqueous solution was investigated. Both batch and column studies were carried out. Results indicate that sorption pH temperature dependent. Equilibrium attained within 20 minutes appeared to be essentially an ion exchange process. Experimental data could fitted into Langmuir isotherm with maximum capacity 18.98 mg g−1 at 7.5 28±2°C. Anions such SO4 2− CrO4 interfere uptake by QRH. In studies,...

Abstract The sorption of Cr(III) from synthetic solution and tannery waste using moss, Calymperes delessertii Besch, was conducted under laboratory conditions to assess its potential in removing Cr(III). Parameters investigated include pH, contact time, initial concentration sorbent dosage. Results obtained isotherm studies show that the by moss followed Langmuir maximum capacities were 15.4 13.7 mg g−1 for respectively. Keywords: Biosorptionmosschromium(III)tannery

Abstract The ability of coconut husk and its dye-coated forms to remove Cu from aqueous solutions has been investigated at different concentrations pH values. effects some common chelators other metal ions on sorption were also studied. equilibrium data obey the Langmuir isotherms for natural husk-Cu systems. Dye modification led an enhancement in sorption. Keywords: SorptioncopperCoconut huskdye modificationenhancement

Abstract The potential of carbonized spent bleaching earth (CSBE) to remove/reduce acid and basic dyes in aqueous solution was investigated. Results show that CSBE more effective removing dyes. Parameters like pH, initial concentration, agitation rate, contact time temperature which affect the sorption process were studied. As determined from Langmuir isotherms maximum capacities for Basic Blue 3 Methylene 102.6 94.5 mg/g respectively. Hence could be a useful sorbent treatment baisc...

Abstract Various chemical modifications were attempted on rice hull in order to improve its metal sorption capacity. Ethylenediamine tetraacetic acid (EDTA) was found give the greatest enhancement. Parameters investigated include pH, initial concentration, sorbent dosage and competition with other cations chelators. Sorption pH dependent greater uptake at higher value. Equilibrium attained less than 60 minutes implying material could be suitable for continuous flow system. Maximum capacities...