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•Novel solid-state conjugate adsorbent was prepared for Ce(III) ion detection and recovery.•The adsorbent was highly effective to the Ce(III) both in the detection and capturing.•The ...co-existing ions were not adversely affected of the Ce(III) capturing by the adsorbent.
The detection, adsorption and recovery of rare-earth elements specially the cerium (Ce(III)) on ligand based optical conjugate adsorbent was systematically studied. The functional ligand of 6-((2-(2-hydroxy-1-naphthoyl)hydrazono) methyl)benzoic acid (HMBA) was synthesized and then successfully anchored onto mesoporous silica by a direct immobilization method for the fabrication of conjugate adsorbent. The Ce(III) ion was detected by the charge transfer (π–π transition) transduction mechanism with high sensitivity and selectivity. The experimental conditions were optimized based on contact time, solution acidity, initial Ce(III) concentration and pH acidity and diverse metal salt concentrations. The conjugate adsorbent was highly sensitive, and the limit of detection was 0.33 µg/L for Ce(III) ions. The Ce(III) adsorption from synthetic aqueous solution also underwent in batch mode. However, the adsorption capacity depended on the solutions pH, initial concentration and to some extent on the competing ions. The experimental data revealed that the maximum Ce(III) adsorption was possible at pH 5.0. The presence of other cations and anions did not adversely affect the Ce(III) capturing by the conjugate adsorbent. The maximum adsorption capacity was determined to be as high as 179.16 mg/g. The extraction and recovery of Ce(III) ions from the saturated adsorbent was possible with 0.20 M HNO3. The regenerated adsorbent that remained maintained the high selectivity to Ce(III) ions and exhibited almost the same capturing ability as that of the original adsorbent. However, the adsorption efficiency was slightly decreased after several cycles. Therefore, the proposed conjugate adsorbent offered a cost-effective adsorbent and may be considered a viable alternative for effectively detection, capturing and recovery of Ce(III) ions from wastewater samples.
The chemical ligand-based conjugate adsorbent was prepared for selective and sensitive toxic lead (Pb(II)) ions monitoring and removal from contaminated water to save water quality and human health. ...Both in the monitoring and removal operations, the solution pH played a vital role by the conjugate adsorbent. The data clarified that pH 3.50 was suitable for simultaneous monitoring and removal of Pb(II) ions. In the monitoring, a significant color was formed upon the addition of Pb(II) ion even in the presence of ultra-trace level. Then the solution pH, reaction time, foreign ion, and initial concentration effect were systematically measured. The conjugate adsorbent exhibited an extremely low detection limit (0.35 µg/L) to comply with the material’s applicability in real sample onsite monitoring. In the reaction time effect, color optimization and high removal efficiency was achieved by increasing the reaction time. However, the diverse foreign ions were not adversely affected in the monitoring and removal to clarify the conjugate adsorbent as sensitive and selective towards the Pb(II) ions. The conjugate adsorbent was shown highly ordered structure and was able to open high functionality for Pb(II) ion monitoring and removal. The adsorption data also revealed that the present conjugate adsorbent exhibited adsorption capacity (172.87 mg/g) and was well fitted by the Langmuir adsorption isotherm with monolayer coverage. The adsorbed Pb(II) ion was desorbed using 0.30 M HCl and then simultaneously regenerated into the initial form for several cycles use after rinsing with water. Then it is expected that the optimum protocol effectively captured the Pb(II) in a sustainable and environmentally friendly manner for the production of clean water to safeguard public health and environmental remediation.
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•A novel conjugate adsorbent was proposed for Pb(II) ion monitoring and removal.•The conjugate adsorbent exhibited high selectivity and sensitivity to Pb(II) ions.•The adsorbent also exhibited high Pb(II) adsorption capacity and low detection limit.
•An organic ligand-based composite adsorbent was fabricated for Cu(II) capturing.•The facile adsorbent was shown extreme sensitivity to Cu(II) ion at optimum protocol.•The adsorbent exhibited ...reusability for several cycles used for Cu(II) ion capturing.
The functional organic ligand of 4-tert-Octyl-4-((phenyl)diazenyl)phenol (TPDP) was immobilized directly onto the mesoporous silica for the fabrication of composite adsorbent to detect and remove the toxic copper (Cu(II)) ions from contaminated water. The mesoporous silica and the composite adsorbent were characterized systematically using different instrumentations. Upon addition of a trace amount of Cu(II) with composite adsorbent, a significant color was formed to visualize the Cu(II) ion detection at optimum experimental protocol. The pH played a key factor in the detection and removal operation and the optimum pH was 4.0 for this study. The effect of pH, color optimization, contact time, competing ions, and concentration was assessed systematically both in the detection and removal operations. The limit detection by the composite adsorbent to Cu(II) ion was 0.28 µg/L. The diverse metal ions did not interfere during the Cu(II) ion detection and removal by the composite adsorbent and complied with the high sensitivity for onsite uses as potential materials. The proposed adsorbent also exhibited high adsorption capacity and was well-fitted in the Langmuir adsorption isotherms in monolayer coverage and the maximum adsorption capacity was as high as 184.73 mg/g. The Cu(II) ion was eluted from the composite adsorbent using 0.15 M HCl and then simultaneously regenerated into the initial stage without losing its major functionality for the next use operation. However, the adsorption efficiency was slightly decreased after several cycles of use according to the data. Then it is estimated that the fabricated ligand-based composite adsorbent in the real waste sample treatment for detection and removal of Cu(II) ions as a low-cost material without using highly sophisticated instrumentations.
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In the era of climate change, global agricultural systems are facing numerous, unprecedented challenges. In order to achieve food security, advanced nano-engineering is a handy tool for boosting crop ...production and assuring sustainability. Nanotechnology helps to improve agricultural production by increasing the efficiency of inputs and minimizing relevant losses. Nanomaterials offer a wider specific surface area to fertilizers and pesticides. In addition, nanomaterials as unique carriers of agrochemicals facilitate the site-targeted controlled delivery of nutrients with increased crop protection. Due to their direct and intended applications in the precise management and control of inputs (fertilizers, pesticides, herbicides), nanotools, such as nanobiosensors, support the development of high-tech agricultural farms. The integration of biology and nanotechnology into nonosensors has greatly increased their potential to sense and identify the environmental conditions or impairments. In this review, we summarize recent attempts at innovative uses of nanotechnologies in agriculture that may help to meet the rising demand for food and environmental sustainability.
•The sustainable ligand-based composite material was prepared for Lu(III) adsorption and recovery.•The materials were shown high selectivity toward Lu(III) ion at optimum protocol.•The foreign ion ...was not interfered with due to the strong affinity at the selected solution acidity.
Organic ligand-based sustainable composite hybrid material (CMHs) was prepared for the sensitive and selective adsorption of Lutetium (Lu(III)) from waste samples. The hard and soft donor organic ligand of (3-(3-(methoxycarbonyl)benzylidene) hydrazinyl)benzoic acid (MBHB) was immobilized according to the direct approach. The carrier silica and ligand-embedded CMHs were characterized systematically. The adsorption of Lu(III) ion was significantly influenced by the solution pH due to the protonation form of the synthesized organic ligand. However, the slightly acidic pH (4.0) was chosen for sensitive and selective separation and adsorption of Lu(III) ions. The co-existing diverse metal ions were not interfered with during the adsorption of the Lu(III) ion because of the high affinity of the Lu(III) ion to CMHs at the optimum experimental protocol. It was expected that the bond distance between Lu-O was shorter than the other bond length of Lu-N atoms of the organic ligand. The Langmuir adsorption isotherm model was defined according to the morphology of the material and implemented to validate the adsorption isotherms according to the homogeneous ordered structures. The adsorption capacity was 171.76 mg/g as expected due to the high surface area of the CMHs. The adsorbed Lu(III) ion was completely eluted from the CHMs with the eluent of 0.35 M HNO3 and the regenerated material was used in several cycles without significant loss in its original performances. Therefore, it is expected that the ligand-based CMHs may hold huge potential in applications and may be scaled up for commercial applications, including specific separation, adsorption, and recovery of Lu(III) ions from waste samples.
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•Novel ligand based solid-state sensor material was fabricated for Cd(II) capturing.•The solid-state sensor was able to sensitively detect the Cd(II) ion at optimum conditions.•The ...foreign ions were not adversely affected to Cd(II) capturing by the sensor.
In this study, the novel functional ligand was synthesized and then successfully immobilized onto the inorganic silica for the fabrication of solid-state sensor for simultaneous detection and adsorption of cadmium (Cd(II)) ion from water samples. The fabricated sensor was formed optical colour upon addition of trace amount of Cd(II) ion at experimental conditions. Several experimental parameters such as sensor morphology, solution pH, colour optimization, detection limit, competing ions effect, desorption and maximum adsorption capacity was evaluated. The data clarified that the materials could detect the ultra-trace level of Cd(II) ion according to the limit of detection was 0.88 µg/L based on the false positives and false negatives with the propagation of uncertainties. The solution pH was exhibited the key role, and the suitable pH 7.0 were selected based on the signal intensity and adsorption efficiency. The competing ions were not adversely affected in the Cd(II) ion detection and adsorption operation. In addition, the signal intensity was observed only for the Cd(II) ion, and these were clarified the high selectivity towards the Cd(II) ion at this experimental conditions. In addition, the adsorption data were well fitted with the Langmuir adsorption model with monolayer coverage. The determined maximum adsorption was 176.19 mg/g, which was comparable with the other forms of materials. The solid-state sensor was exhibited the high reusability based on the desorption performances. The desorption was carried out using 0.20 M HCl and then the sensor was ready to use after rinsing with water without significant loss in its performances. Therefore, the proposed solid-state sensor has high possibility in the real wastewater.
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•The Cd(II) was monitored and removed by ligand-based composite adsorbent efficiently.•The composite adsorbent was able to detect trace-level Cd(II) ions with high sensitivity.•The ...competing ions did not interfere in Cd(II) ions detection & removal by the adsorbent.
Developing an eco-friendly composite adsorbent via an eco-friendly process for detection and removing Cd(II) from wastewater is urgently necessary due to the critical hazards of Cd(II) to public health and environmental safety. The chemical ligand of 2,2′-Biquinoline-4,4′-dicarboxylic acid (BIDA) was embedded directly on the mesoporous silica for the fabrication of facial composite adsorbent (FCA) for toxic cadmium (Cd(II)) ion detection and removal from wastewater solutions. The FCA nanostructures were characterized by SEM, TEM, and N2 adsorption/desorption analyzer systematically. The physicochemical properties of FCA, as well as the primary influencing factors and mechanism of Cd(II) detection and adsorption processes, were also investigated. More interestingly, a colorimetric method based on color enhancement upon adding Cd(II) was developed by the FCA to detect low concentrations of Cd(II) ions. The solution pH played a key factor in color formation and neutral pH of 7.0 was selected based on the optimum color formation. The limit of detection was 0.39 µg/L. The preeminent adsorption capacity of FCA toward Cd(II) was (159.21 mg/g) which was mainly ascribed to the complexation of Cd(II) with the functional groups of BIDA coating FCA. The adsorption isotherms and kinetics data preferably conformed to the Langmuir isotherms model with monolayer coverage. The detection and adsorption of Cd(II) were not affected by other cations at the optimum experimental conditions. The FCA exhibited high reusability based on the elution and regeneration performances. The elution was carried out using 0.20 M HCl and then the FCA was ready to use after washing with water without loss in its functionality. The successful removal and detection of Cd(II) water samples demonstrates the great potential of the proposed FCA to remediate Cd(II) polluted water to safeguard water quality.
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•The ligand-based optical composite material was fabricated for effective Cd(II) capturing.•The proposed material was effective to capture the Cd(II) ion with high sensitivity.•The ...foreign metals did not compete with Cd(II) ions during detection & removal.
The chemical ligand of N,N–bis(salicylidene)1,2–bis(2–aminophenylthio)ethane (BSBAE) was synthesized and then embedded indirectly on the mesoporous silica for the fabrication of optical composite materials (OCM) for toxic cadmium (Cd(II)) ion detection and removal from wastewater solutions. The variable parameters were measured including solution acidity, contact time, initial concentration, selectivity, and sensitivity, on the detection and removal of Cd(II) by the OCM. The solution pH played an important role in detection and removal but the present OCM worked well in the acidic pH region at 3.50. The data clarified that OCM formed distinguished color upon the addition of trace level of Cd(II) ions. The results also disclosed that the OCM was not affected by the existing diverse metal ions and the signal intensity was observed only toward the Cd(II) ion. The OCM was able to detect the low-level Cd(II) ion as the detection limit was 0.32 µg/L and the adsorption of the highest removal capacity was 179.65 mg/g. In addition, the diverse foreign ions were not reduced the Cd(II) ion adsorption significantly, and the OCM has approximately no adsorption capacity for other ions at this pH. The elution of Cd(II) ions from the saturated OCM was desorbed successfully with 0.25 M HCl. The regenerated OCM that remained maintained the high selectivity to Cd(II) ions and exhibited almost the same adsorption capacity as that of the original OCM. However, the adsorption efficiency slightly decreased after several cycles according to the experimental data observation. Therefore, the proposed OCM offered a cost-effective material and may be considered a viable alternative for effectively toxic Cd(II) ion detection and removal from wastewater as potential materials.
The Aldehyde dehydrogenase (ALDH) superfamily comprises a group of enzymes involved in the scavenging of toxic aldehyde molecules by converting them into their corresponding non-toxic carboxylic ...acids. A genome-wide study in potato identified a total of 22 ALDH genes grouped into ten families that are presented unevenly throughout all the 12 chromosomes. Based on the evolutionary analysis of ALDH proteins from different plant species, ALDH2 and ALDH3 were found to be the most abundant families in the plant, while ALDH18 was found to be the most distantly related one. Gene expression analysis revealed that the expression of StALDH genes is highly tissue-specific and divergent in various abiotic, biotic, and hormonal treatments. Structural modelling and functional analysis of selected StALDH members revealed conservancy in their secondary structures and cofactor binding sites. Taken together, our findings provide comprehensive information on the ALDH gene family in potato that will help in developing a framework for further functional studies.
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