scholarly journals Biochars from Lignin-rich Residue of Furfural Manufacturing Process for Heavy Metal Ions Remediation

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1037 ◽  
Author(s):  
Baobin Wang ◽  
Miao Ran ◽  
Guigan Fang ◽  
Ting Wu ◽  
Yonghao Ni
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Manufacturing Process ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Hydrothermal Carbonization ◽  
Raw Material ◽  
Metal Ion Removal ◽  
Heavy Metal Ion Removal ◽  
Kinetics And Isotherms

The pentose/furfural industrial manufacturing process uses corn cob residue as a raw material, where such a process yields significant amount of lignin-rich residue (LCR) at the end, which is commonly disposed by burning. In this study, the conversion of LCR to biochars (BCs), and their subsequent applications for heavy metal ion removal, were investigated. The BCs were prepared through hydrothermal carbonization and post-activation, using either ZnCl2 or H3PO4 treatment. The as-prepared activated BCs were characterized using N2 adsorption–desorption isotherms, XRD, FT-IR, SEM and TEM, and their performance in removing heavy metal ions (Pb2+, Cu2+, Cd2+) from aqueous solutions was assessed. The ZnCl2-activated BCs (BC-ZnCl2) exhibit a higher adsorption capacity than the H3PO4-activated BCs (BC-H3PO4), mainly due to the differences in their chemical/physical characteristics. The related adsorption kinetics and isotherms were analyzed.

Effect of Different Chemical and Physical Characteristic Having Lignocellulosic Fibers on Heavy Metal Ion Removal from Auqueous Solution

2008 ◽  
Vol 569 ◽  
pp. 285-288 ◽  
Author(s):  
Hyun Jong Lee ◽  
Beom Goo Lee ◽  
Dae Yong Shin ◽  
Heon Park
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Lignocellulosic Fibers ◽  
Heavy Metal Ion Removal ◽  
Kenaf Bast

In this study lignocellulosic fibers, such as kenaf bast, kenaf core, sugar cane bagasse, cotton, coconut coir, and spruce, which are environment friendly natural materials, were tested for their ability to remove copper, nickel and zinc ions from aqueous solutions. The fibers were analyzed for Klason lignin content, water sorption capacity and dry volume. The fiber with the highest level of heavy metal removal in the separate and mixed solution was kenaf bast.. In the mixed solution kenaf bast, sugar cane bagasse and cotton removed more copper and nickel ion than in the separate solution, and the amounts of removed heavy metal ions were changed in some lignocellulosic fibers, compared to those of the separate solution. In the mixed solution heavy metal ions may compete with one another for sorption sites on the surface of lignocellusic fiber. In kenaf bast to remove heavy metal ions most, Klason lignin content was the second lowest, and water sorption and dry volume were the lowest in all tested lignocellulosic fibers. It showed that removal of heavy metal ions does not correlate with any chemical and physical factors, but may be affected by the cell wall structure of lignocellulosic fibers and how many free phenolic groups in lignin, which are considered as the heavy metal ion binding site, are exposed on the surface of fibers. Cotton, with about 1% Klason lignin, was very low in heavy metal ion removal, while all other fibers containing greater than about 10% lignin did remove heavy metal ions. It showed that even the lignin content of lignocellulosic fibers does not correlate with heavy metal ion removal but lignin does play a role in heavy metal ion removal.

scholarly journals Selective Removal of Toxic Ions from Water/Wastewater: Using a Novel Surfactant

Substantia ◽  
2021 ◽  
pp. 79-88
Author(s):  
Mohammad Ziaee ◽  
Mojtaba Taseidifar ◽  
Richard M. Pashley ◽  
Barry W. Ninham
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Toxic Heavy Metal ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Advantages And Disadvantages ◽  
Heavy Metal Ion Removal ◽  
Green Surfactant

Pollution of drinking water by toxic heavy-metal ions is a matter of concern worldwide. These ions occur naturally, and also from environmental spills, radioactive wastes and other industrial waste. Arsenic and lead are typical examples. A novel green surfactant, purpose designed, and environmentally friendly is shown to be extremely effective and specific for heavy metal ion removal. This is a considerable step forward on previous technologies. Surfactants have been used universally to remove organic and inorganic contaminants from water. But little selectivity has been achieved. After usage, the residual surfactants are discharged into surface waters or sewage systems.  This causes environmental pollution. In this review, three surfactants from different classes (novel green surfactant, synthetic chemical surfactant and biosurfactant) are compared in terms of their efficiency in flotation, removal of different heavy-metal ions, biodegradability, and toxicity level, including their advantages and disadvantages.

Removal of Heavy Metal Ions with Hacac-Silica

2014 ◽  
Vol 901 ◽  
pp. 45-51
Author(s):  
Dan Feng Cui ◽  
Jian Zhuang Zhao ◽  
Yan Ying Zheng
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
High Specific Surface Area ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Ultrasonic Technology ◽  
Heavy Metal Ion Removal

This paper presents a new decoration view functionalization of mesoporous silica to extend their applications to heavy metal ion removal. The study showed that Hacac can be incorporated into the structure through in-situ strategy, and the calcined Hacac-silica possesses advantages of high specific surface area of about 1496 m2/g and pore size of 4nm, ordered spheric morphology of about 300nm in diameter. Auxiliary by ultrasonic technology, the heavy metal ions remove rates are more than 95% for Pb2+, Cu2+ and Cr3+. More choice of chelating agents can be used for further functionalization of silica based mesoporous material.

Thermoresponsive Ion-Imprinted Composite Hydrogels for Heavy Metal Ion Removal

2013 ◽  
Vol 661 ◽  
pp. 162-165 ◽  
Author(s):  
Jing Jing Wang ◽  
Xian Ning Li
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Ion Imprinted ◽  
Heavy Metal Ion Removal ◽  
Gel Transition

A novel thermoresponsive Cu(II) ion-imprinted composite hydrogel [Cu(II)-IICH] based on N-isopropylacrylamide (NIPAM) and aminated silica (SiO2-NH2) has been prepared by in situ free-radical polymerization using Cu(II) ion as template. The Cu(II)-IICH was used to remove heavy metal ions from aqueous solution at 20 and 40oC. The Cu(II)-IICH selectively bound the template ion above a critical gel transition temperature (CGTT) of crosslinked poly(N-isopropylacrylamide) (PNIPAM). The memory was fixed by shrinking above the CGTT, and was deleted by swelling below the CGTT. In order to study the reusability of the Cu(II)-IICH, the sorption-desorption cycles were performed for five times. The results suggested that the Cu(II)-IICH can be used for several times without significantly decreasing its adsorption capacity.

scholarly journals A Short Review on the N,N-Dimethylacrylamide-Based Hydrogels

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 234
Author(s):  
Ayatzhan Akhmetzhan ◽  
Nurbala Myrzakhmetova ◽  
Nurgul Amangeldi ◽  
Zhanar Kuanyshova ◽  
Nazgul Akimbayeva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Large Scale ◽  
Short Review ◽  
Self Healing ◽  
Practical Applications ◽  
Metal Ion Removal

Scientists have been encouraged to find different methods for removing harmful heavy metal ions and dyes from bodies of water. The adsorption technique offers promising outcomes for heavy metal ion removal and is simple to run on a large scale, making it appropriate for practical applications. Many adsorbent hydrogels have been developed and reported, comprising N,N-dimethylacrylamide (DMAA)-based hydrogels, which have attracted a lot of interest due to their reusability, simplicity of synthesis, and processing. DMAA hydrogels are also a suitable choice for self-healing materials and materials with good mechanical properties. This review work discusses the recent studies of DMAA-based hydrogels such as hydrogels for dye removal and the removal of hazardous heavy metal ions from water. Furthermore, there are also references about their conduct for self-healing materials and for enhancing mechanical properties.

scholarly journals Preparation and characterization of p-sulfonated calix[4]arene functionalized chitosan hydrogel beads and their preliminary adsorption study towards removal of lead(II) and zinc(II) ions

2020 ◽  
Vol 16 (4) ◽  
pp. 429-432
Author(s):  
Hamizah Syahirah Mohamad Zubir ◽  
Mohd Haniff Wahid ◽  
Irene Ling ◽  
Hong Ngee Lim ◽  
Sazlinda Kamaruzaman ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Sodium Hydroxide Solution ◽  
Acetic Acid Solution ◽  
Chitosan Hydrogel ◽  
Metal Ion Removal ◽  
Hydrogel Beads ◽  
Modified Chitosan

p-sulfonated calix[4]arene functionalized chitosan hydrogel beads have been successfully prepared by mixing p-sulfonated calix[4]arene and chitosan in dilute acetic acid  solution (1% v/v), followed by dropping the mixture into sodium hydroxide solution to form beads with diameters of ~0.1 cm. The presence of the active sulfonate groups and the unique structure of calixarene render the material useful as an adsorbent for heavy metal ions. Metal adsorption on p-sulfonated calix[4]arene is possible through a combination of physical and ionic interactions. Atomic Absorption Spectroscopy (AAS) results showed that the amount of adsorbed metal ion is optimum at 10 ppm for all samples. The overall percentage of metal ion removal shows that p-sulfonated calix[4]arene modified chitosan is the best adsorbent with up to 98% removal achieved for Pb(II) and 90% removal for Zn(II). This is followed by p-sulfonated calix[4]arene and graphene oxide (GO) modified chitosan with up to 90% removal for Pb(II)  and 89% removal for Zn(II) and pure chitosan hydrogel beads with up to 60% removal for both Pb(II)  and Zn(II). The results clearly prove that the presence of p-sulfonated calix[4]arene can enhance the adsorption of heavy metal ions. In addition, the adsorbent shows higher Pb(II) removal compared to Zn(II).

scholarly journals Using amine-functionalized magnetite hollow nanospheres (AMHNs) as adsorbents for heavy metal ions

2017 ◽  
Vol 76 (2) ◽  
pp. 452-458 ◽  
Author(s):  
Sen Lin ◽  
Lili Liu ◽  
Yong Yang ◽  
Wei Zhang ◽  
Meng Xu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Hollow Nanospheres ◽  
One Pot ◽  
Amine Functionalized ◽  
Physicochemical Features ◽  
Kinetics And Isotherms

In this paper, the amine-functionalized magnetite hollow nanospheres (AMHNs), prepared through a facile one-pot synthesis, were used as heavy metal ion adsorbents, whose morphology and physicochemical features were exploring by transmission electron microscopy, vibrating sample magnetometer, X-ray diffraction and Fourier-transform infrared analyses. Its adsorption performances for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were studied in detail. The adsorption increased with the increase of initial pH value of the solution and could be obviously affected by ionic strength. Also, the adsorption kinetics and isotherms were studied. The adsorption processes for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ could all reach equilibrium in 60 min and be described well by the Langmuir thermodynamics model. The saturated adsorption capacities for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were 0.66, 0.47, 0.45, 0.38 and 0.26 mmol/g, respectively. In addition, the competitive adsorption showed the AMHNs had higher affinity to Pb2+ than to other heavy metal ions.

Enhanced Adsorption Properties of Poly(2-Acrylamido-2-Methyl-1-Propansulfonic Acid)/Silica Composite Materials for Heavy Metal Ion Removal

2012 ◽  
Vol 164 ◽  
pp. 154-157
Author(s):  
Jing Jing Wang ◽  
Xian Ning Li
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Silica Content ◽  
Metal Ion Removal ◽  
Composite Hydrogels ◽  
Ion Removal ◽  
Silica Composite ◽  
Heavy Metal Ion Removal ◽  
Enhanced Adsorption

Poly(2-acrylamido-2-methyl-1-propansulfonic acid)(PAMPS)/silica composite hydrogels have been prepared by in situ free-radical polymerization. The composite hydrogels were used to remove heavy metal ions from aqueous solution under the non-competitive condition. The results showed that the adsorption capacity of the hydrogels increased with the pH values and silica content in the formulation. Furthermore, the synergistic complexation of metal ions was found in the adsorption studies. Regeneration studies suggested that metal rebinding capacity of the hydrogels did not change significantly through repeated applications compared with the first run.

scholarly journals Adsorption of Heavy Metals Using Mixture of Waste Products

2019 ◽  
Vol 31 (5) ◽  
pp. 1009-1012 ◽  
Author(s):  
Shalini ◽  
Pratibha Naithani
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Peanut Shell ◽  
Waste Products ◽  
Metal Ion Removal ◽  
Nickel Chromium ◽  
Lead Nickel ◽  
Physical And Chemical

A new adsorbent for removing lead, nickel, chromium and arsenic ions from industrial wastewaters has been investigated. This new adsorbent consists of four waste products tea waste, rice husk, sugarcane bagasse and peanut shell. The adsorbent was prepared without any physical and chemical treatment. Batch experiments were conducted to assess the removal of selected metal ions from wastewaters. The results have shown that the mixture of four waste products presented an excellent adsorption of heavy metal ions. The equilibrium time was dependent on type of adsorbent and sample. The highest percentage of metal ion removal was 100 %. The results showed pseudo second order kinetics. The surface chemical nature of prepared adsorbent was studied by Fourier transform infrared spectroscopy. The functional group present in adsorbent has affinity towards heavy metal ions to form metal complexes. The surface morphology of prepared adsorbent was confirmed by scanning electron microscopy and chemical composition was analyzed by energy dispersive X-ray spectroscopy.

Kinetic study of Heavy Metal ion removal through Hydrogels

2021 ◽  
Vol 25 (9) ◽  
pp. 127-132
Author(s):  
Anamica . ◽  
P.P. Pande
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ion ◽  
Visible Absorption ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Metal Ion Adsorption ◽  
Heavy Metal Ion Removal ◽  
Removal Of Metal Ions

The crosslinkers allyl mannitol (AM), allyl sorbitol (AS) and allyl pentaerythritol (AP) have been used for the synthesis of crosslinked polymeric gels of acrylic acid. These gels were used for the removal of heavy metal ions from water. The quantitative removal of metal ions was determined with the support of UV-visible absorption spectroscopy. The results show that the fully dried hydrogel samples have better adsorption potential for heavy metal ion removal. The kinetics of metal ion adsorption during the treatment of wastewater has also been studied. It was found that under certain conditions, the kinetics involved may be of pseudo first order while under different set of conditions, the kinetics involved is of pseudo second order.

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