Article
Environmental Sciences
Mauricio Faleschini, Erica Giarratano, Monica N. Gil
Summary: Efficiencies in metal removal using unmodified sludge generated in the wastewater treatment pond from the wool industry in Trelew, Argentina were evaluated. Optimal sorption conditions were assessed, and the sludge was characterized by low porosity and scarce organic matter content. Kinetic studies showed that the metal retention followed the pseudo-second-order model, indicating chemisorption as the dominant mechanism.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Environmental Sciences
Xiaoqing Cai, Yinxia Wu, Yu Chuang, Chan He, Tiantian Shi
Summary: This study describes the use of bentonite-supported nanoscale zero-valent iron (B-nZVI) for simultaneous adsorption of Pb (II) and Ni (II) and compares it to single adsorbate situation. The effect of reaction conditions on adsorption efficiency and stability of B-nZVI after adsorbing heavy metals is investigated. In binary mixtures, competition for binding sites and interactions between B-nZVI and metal ions are identified. The adsorption efficiencies of Pb (II) and Ni (II) on B-nZVI are determined and the adsorption mechanisms are studied through various models.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Polymer Science
Huda Alsaeedi, Hilal Ahmad, Malak Faisal Altowairqi, Afnan Abdullah Alhamed, Ali Alsalme
Summary: Cellulose nanoparticles were synthesized and covalently functionalized with multi-functional group for their excellent application in environmental remediation technology. The hybrid material demonstrated excellent adsorption properties for simultaneous extraction of multiple metal ions. The sorbent exhibited a sorption capacity in the range of 1.8-2.2 mmol/g. The method was successfully employed for simultaneous extraction and determination of Pb(II), Cd(II) and Cu(II) from real-world samples, with a preconcentration limit of 0.7 ppb and a detection limit of 0.4 ppb.
Article
Environmental Sciences
Yingya Wang, Hanbing Zhang, Muhammad Yaseen, Zhangfa Tong, Ninghua Chen, Huazhen Shi
Summary: Organic modification of magnetic alkaline Ca-bentonite resulted in the preparation of a film material with magnetic separation ability and enhanced removal performance for heavy metal cations. The modified material exhibited higher adsorption capacity for heavy metal ions and could be efficiently recycled with minimal decrease in adsorption capacity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Khondaker M. N. Alam, Evert J. Elzinga
Summary: Batch kinetic experiments combined with XAS were conducted to investigate the sorption behavior of Mn-(II), Co-(II), Ni-(II), Zn-(II), and Cd-(II) with sulfated green rust (GR) in anoxic suspensions at pH 8. The results showed that all five divalent metals coordinated at Fe-(II) sites of the GR sorbent. However, there were differences in the sorption behavior, with Mn-(II) and Cd-(II) showing limited uptake and Co-(II), Ni-(II), and Zn-(II) exhibiting extensive sorption throughout the experimental time frame. This was attributed to differences in affinity and extent of substitution in Fe-(II) sites of the GR lattice controlled by ionic size.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Hao Xu, Xinjiang Hu, Yonghua Chen, Yan Li, Riqing Zhang, Chunfang Tang, Xi Hu
Summary: The study successfully synthesized HA-Fe-PILC with excellent adsorption performance for Cd(II) and Pb(II) removal. The results demonstrated the potential application of HA-Fe-PILC in wastewater treatment, showing high efficiency in heavy metal removal.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Analytical
Eshraq Aljamal, Mohmmed Rasheed, Fawwaz Khalili
Summary: Carbonate and silicate natural sediments from the gulf of Aqaba-Jordan were studied for the adsorption of nickel, lead, and cadmium ions. The adsorption process was found to be spontaneous and endothermic, with an increase in adsorption capacity with increasing pH.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Beata Jablonska, Tomasz Drozdz, Pawel Jablonski, Pawel Kielbasa
Summary: This study investigates the removal of Pb(II), Cd(II), and Ni(II) ions from aqueous solutions using nonthermal plasma with a dielectric barrier discharge. Optimization of solution flow rate, generator modulation frequency, and duty cycle was performed, and it was found that each pass of the solution through the plasma reactor resulted in a decrease in Cd(II) and Ni(II) concentrations. Pb(II) concentration dropped rapidly after one pass, but further passes did not improve its removal. The removal percentages were 88% for Cd(II) after six passes, 72% for Pb(II) after one pass, and 19% for Ni(II). The purification mechanism involved the precipitation of metal ions due to an increase in solution pH after exposure to plasma.
Article
Chemistry, Physical
Ryo Taguchi, Hideshi Seki, Hideo Maruyama
Summary: Adsorption behaviors of Pb and Cd onto carbonized Polygonum sachalinense (CPS) were investigated. The adsorption model based on monodentate binding of divalent metal ions with carboxylic and phenolic groups explained the adsorption behaviors. The maximum adsorption capacity of CPS for divalent metal ions was determined as 1.22 mmol/g, and Pb showed higher binding affinities than Cd. The kinetics of Pb and Cd adsorption on CPS revealed that the adsorption onto phenolic groups was rate limiting step.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Environmental Sciences
Sema Bagdat, Feyzullah Tokay, Sahin Demirci, Selehattin Yilmaz, Nurettin Sahiner
Summary: Super porous polyethyleneimine (PEI) cryogels were used as adsorbents to remove Cd(II), Co(II), Cr(III), Ni(II), Pb(II), and Zn(II) from contaminated waters. The optimum pH value and contact time for removing the analytes were determined as 4.0 and 90 min, respectively. The adsorption capacities of the sorbent ranged from 19.88 to 24.39 mg/g for target metal ion solutions with a concentration of 50 mg/L. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherms followed the Langmuir isotherm model. The PEI cryogels showed selectivity and tolerance to high concentrations of different ions and successfully removed the target analytes from industrial wastewater samples with removal rates ranging from 80.35% to 99.89%.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Lin Zhang, Xin Yang, Sensen Li, Lingyi Tang, Tianyi Chen, Tingting Gu, Genqiang Chen, Geoffrey Michael Gadd, Zhen Li
Summary: In this study, the responses of Aspergillus niger to three toxic metals (Pb2+, Cd2+, and Cu2+) were investigated. It was found that A. niger had higher tolerance to Pb2+ than to Cd2+ and Cu2+. An appropriate concentration of Pb2+ stimulated fungal growth and metabolism, while Cd2+ and Cu2+ stress showed negative influences on fungal physiological parameters.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Astronomy & Astrophysics
Saeed Negahban, Marzieh Mokarram
Summary: The study estimated and analyzed the rate of heavy metal changes in soils of road margins affected by traffic on Fasa-Darab Road, Iran. Results showed that Pb and Cd were the most relevant parameters in the analysis of potential ecological risk index (PERI) within the study area.
EARTH AND SPACE SCIENCE
(2021)
Article
Chemistry, Analytical
Sadin Ozdemir, Ersin Kilinc, Omer Acer, Mustafa Soylak
Summary: In this study, E. profundum loaded onto Amberlite XAD-4 resin was used for solid-phase extraction of Cu(II), Ni(II), and Pb(II). Various conditions of the SPE procedure and the effects of interfering ions were discussed. The biosorption capacities of E. profundum for Pb(II), Cu(II), and Ni(II) were determined, with LOD values and linear ranges calculated for each metal. Metal ion concentrations in water and food samples were measured using ICP-OES.
MICROCHEMICAL JOURNAL
(2021)
Article
Materials Science, Paper & Wood
Rui Tang, Hanbing Zhang, Yaseen Muhammad, Caimei Lu, Kun Liu, Sishan Yu, Zhangfa Tong
Summary: By modifying magnetic bentonite with mesh-bag-like structures, an adsorbent with improved adsorption performance and stability was synthesized, which can effectively remove heavy metals from wastewater. The modified adsorbent has multiple adsorption sites, high adsorption rates and capacities, and exhibits good reusability in a wide pH range.
Article
Environmental Sciences
Gang Li, Jinli Zhang, Yu Li, Jia Liu, Zhen Yan
Summary: The study found that the adsorption characteristics of Pb(II), Cd(II) and Cu(II) on MWCNT-HAP are significantly influenced by factors such as solid-to-liquid ratio, pH, and ionic strength, and the adsorption process is spontaneous and endothermic.
ENVIRONMENTAL TECHNOLOGY
(2021)
