Production of Paper From Walnut Shells

Elevated or unnatural levels of arsenic (As) and phosphorus (P) concentrations in soils and waterbodies from anthropogenic sources can present significant hazards for both natural ecosystems and human food production. Effective, environmentally friendly, and inexpensive materials, such as biochar, are needed to reduce mobility and bioavailability of As and P. While biochar features several physicochemical properties that make it an ideal contaminant sorbent, certain modifications such as mineral-impregnation can improve sorption efficiencies for targeted compounds. Here, we conducted sorption experiments to investigate and quantify the potential utility of magnesium (Mg) for improving biochar sorption efficiency of P and As. We synthesized a Mg-modified walnut shells-derived biochar and characterized its ability to remove As and P from aqueous solutions, thereby mitigating losses of valuable P when needed while, at the same time, immobilizing hazardous As in ecosystems. SEM-EDX, FTIR and elemental analysis showed morphological and functional changes of biochar and the formation of new Mg-based composites (MgO, MgOHCl) responsible for improved sorption potential capacity by 10 times for As and 20 times for P. Sorption efficiency was attributed to improved AEC, higher SSA, chemical forms of sorbates and new sorption site formations. Synthetized Mg-composite/walnut shell-derived biochar also removed >90% of P from real samples of wastewater, indicating its potential suitability for contaminated waterbody remediation.

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Investigation of filtration properties and microbiological characteristics of sewage sludge after physical conditioning with the use of ground walnut shells

Powder Technology ◽

10.1016/j.powtec.2019.11.100 ◽

2020 ◽

Vol 361 ◽

pp. 491-498

Author(s):

Marta Wójcik

Keyword(s):

Sewage Sludge ◽

Physical Conditioning ◽

Walnut Shells ◽

Microbiological Characteristics ◽

Filtration Properties

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Addition of walnut shells biochar to alkaline arable soil caused contradictory effects on CO2 and N2O emissions, nutrients availability, and enzymes activity

Chemosphere ◽

10.1016/j.chemosphere.2021.133476 ◽

2022 ◽

pp. 133476

Author(s):

Tanveer Ali Sial ◽

Sabry M. Shaheen ◽

Zhilong Lan ◽

Punhoon Khan Korai ◽

Imran Ghani ◽

...

Keyword(s):

Arable Soil ◽

N2o Emissions ◽

Enzymes Activity ◽

Walnut Shells ◽

Nutrients Availability

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Effect of peanut and walnut shells powders on tensile properties and morphological test by using heat cured PMMA as a matrix for prosthetic Denture

Engineering and Technology Journal ◽

10.30684/etj.v39i2a.1730 ◽

2021 ◽

Vol 39 (2A) ◽

pp. 196-205

Author(s):

Zainab M. Abdul Monem ◽

Jawad K. Oleiwi ◽

Qahtan A. Hamad

Keyword(s):

Fracture Surface ◽

Surface Morphology ◽

Matrix Material ◽

Weight Fraction ◽

Fracture Surface Morphology ◽

Ductile Materials ◽

Walnut Shells ◽

Peanut Shells ◽

The Matrix ◽

Material Powder

In the current Research , the heat cured matrix material powder of PMMA was reinforced with peanut and walnut shells (natural powders) which are chemically treated with 5% (w/v) (NaOH) to improve the matrix bonding (PMMA) before being used as a reinforcing powder and adding to exactly similar averages particle sizes ≤ (53µm), with different weight fractions of (4, 8, and 12 wt.%). The ASTM D638 is used for composite specimens of the tensile test. The results indicated that the Elastic modulus values reached its maximum value at (8 wt.%.) when reinforced with peanut shells particles (1.053Gpa) , while ,the values of tensile strength, elongation percentage at break, decrease as the weight fraction of peanut and walnut shells powder increase and the lowest values is obtained by reinforcing with peanut shells particles to reach their minimum values at (12 wt.%.) where the lowest values of them are (29 MPa, 2.758% ) respectively. The fracture surface morphology of pure PMMA seemed to be homogenous morphology in (SEM) test, whereas the fracture surface morphology of PMMA composite reinforced by (peanut and walnut shells) powders and shows a roughness fracture surface morphology this refer to semi ductile to ductile materials.

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Torrefaction kinetics of almond and walnut shells

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-017-6721-6 ◽

2017 ◽

Vol 131 (3) ◽

pp. 3065-3075 ◽

Cited By ~ 8

Author(s):

Bor-Sen Chiou ◽

Trung Cao ◽

Diana Valenzuela-Medina ◽

Cristina Bilbao-Sainz ◽

Roberto J. Avena-Bustillos ◽

...

Keyword(s):

Walnut Shells ◽

Kinetics Of

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The in situ remediation of aquaculture water and sediment by commercial probiotics immobilized on different carriers

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2021.049 ◽

2021 ◽

Author(s):

Mengmeng Yi ◽

Chun Wang ◽

He Wang ◽

Xi Zhu ◽

Zhigang Liu ◽

...

Keyword(s):

Water Quality ◽

High Throughput Sequencing ◽

Relative Concentration ◽

Ammonia Nitrogen ◽

Quality Parameters ◽

Water Quality Parameters ◽

Treatment Groups ◽

Walnut Shells ◽

Water And Sediment ◽

Aquaculture Water

Abstract In the present study, we investigated the effect of probiotics immobilized by oyster shells (Os), vesuvianite (Ve) and walnut shells (Ws) on the remediation of aquaculture water and sediment by analyzing the variation of ammonia-nitrogen (NH4–N), nitrate-nitrogen (NO3–N), nitrite-nitrogen (NO2–N), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (CODCr), as well as the microbiota of the water and sediment. The positive or negative effects of the treatment groups on the water quality parameters were both observed. Compared with their effects on water quality parameters, the treatment groups had better effects on sediment parameters. Group Ve had the best remediation effect of NH4–N and NO3–N in the sediment (decreased by 5.22 and 1.66 times, respectively). Group Os showed a lower relative concentration of TN and CODCr (decreased by 3.77 and 0.95 times, respectively). The high-throughput sequencing results revealed that the immobilized probiotics increased the relative abundances of functional bacteria in the treatment groups at the phylum and genus level. The above results showed that probiotics immobilized by oyster shells, vesuvianite and walnut shells positively affected the aquaculture environment's remediation, especially the sediment.

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Activated carbons prepared from hazelnut shells, walnut shells and peanut shells for high CO2 adsorption

Polish Journal of Chemical Technology ◽

10.1515/pjct-2017-0025 ◽

2017 ◽

Vol 19 (2) ◽

pp. 38-43 ◽

Cited By ~ 11

Author(s):

Katarzyna Lewicka

Keyword(s):

Surface Area ◽

Co2 Adsorption ◽

Activated Carbons ◽

Dft Method ◽

Adsorption Method ◽

Walnut Shells ◽

Peanut Shells ◽

Activating Agent ◽

Hazelnut Shells ◽

Bet Equation

Abstract Research treats about producing activated carbons for CO2 capture from hazelnut shells (HN), walnut shells (WN) and peanut shells (PN). Saturated solution of KOH was used as an activating agent in ratio 1:1. Samples were carbonized in the furnace in the range of temperatures 600°C–900°C. Properties of carbons were tested by N2 adsorption method, using BET equation, DFT method and volumetric CO2 adsorption method. With the increase of carbonization temperature specific surface area of studied samples increased. The largest surface area was calculated for samples carbonized at 900°C and the highest values of CO2 adsorption had samples: PN900 at 0°C (5.5 mmol/g) and WN900 at 25°C (4.34 mmol/g). All of the samples had a well-developed microporous structure.

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Slow pyrolysis of walnut shells in nitrogen and carbon dioxide

Fuel ◽

10.1016/j.fuel.2018.03.094 ◽

2018 ◽

Vol 225 ◽

pp. 419-425 ◽

Cited By ~ 15

Author(s):

O. Senneca ◽

F. Cerciello ◽

S. Heuer ◽

P. Ammendola

Keyword(s):

Carbon Dioxide ◽

Slow Pyrolysis ◽

Walnut Shells

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N-doped porous carbon derived from walnut shells with enhanced electrochemical performance for supercapacitor

Functional Materials Letters ◽

10.1142/s1793604719500425 ◽

2019 ◽

Vol 12 (03) ◽

pp. 1950042 ◽

Cited By ~ 7

Author(s):

Yunfeng Wang ◽

Honghui Jiang ◽

Shewen Ye ◽

Jiaming Zhou ◽

Jiahao Chen ◽

...

Keyword(s):

Electrochemical Performance ◽

Specific Capacitance ◽

Porous Carbon ◽

Low Cost ◽

High Specific Capacitance ◽

Cycling Stability ◽

Electrochemical Performances ◽

Walnut Shells ◽

Electrochemical Cycling ◽

Elemental Doping

As the low-cost, natural multi-component for elemental doping and environment-friendly characteristics, biomass-derived porous carbon for energy storage attracts intense attention. Herein, walnut shells-based porous carbon has been obtained through carbonization, hydrothermal and activation treatment. The corresponding porous carbon owns superior electrochemical performances with specific capacitance reaching up to 462[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], and shows excellent cycling stability (5000 cycles, [Formula: see text]94.2% of capacitance retention at 10[Formula: see text]A[Formula: see text]g[Formula: see text]). Moreover, the symmetry supercapacitor achieves high specific capacitance (197[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text]), relevant electrochemical cycling stability (5000 cycles, 89.2% of capacitance retention at 5[Formula: see text]A[Formula: see text]g[Formula: see text]) and high power/energy density (42.8[Formula: see text]W[Formula: see text]h[Formula: see text]kg[Formula: see text] at 1249[Formula: see text]W[Formula: see text]kg[Formula: see text]). Therefore, the facile synthesis approach and superb electrochemical performance ensure that the walnut shells-derived porous carbon is a promising electrode material candidate for supercapacitors.

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