scholarly journals Recent Advances in Biopolymer-Based Dye Removal Technologies

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4697
Author(s):  
Rohan S. Dassanayake ◽  
Sanjit Acharya ◽  
Noureddine Abidi
Keyword(s):  
Membrane Filtration ◽  
Dye Removal ◽  
High Efficiency ◽  
Low Cost ◽  
Cost Effective ◽  
Synthetic Dyes ◽  
Health Related ◽  
Removal Technologies ◽  
Chitin And Chitosan ◽  
Intense Color

Synthetic dyes have become an integral part of many industries such as textiles, tannin and even food and pharmaceuticals. Industrial dye effluents from various dye utilizing industries are considered harmful to the environment and human health due to their intense color, toxicity and carcinogenic nature. To mitigate environmental and public health related issues, different techniques of dye remediation have been widely investigated. However, efficient and cost-effective methods of dye removal have not been fully established yet. This paper highlights and presents a review of recent literature on the utilization of the most widely available biopolymers, specifically, cellulose, chitin and chitosan-based products for dye removal. The focus has been limited to the three most widely explored technologies: adsorption, advanced oxidation processes and membrane filtration. Due to their high efficiency in dye removal coupled with environmental benignity, scalability, low cost and non-toxicity, biopolymer-based dye removal technologies have the potential to become sustainable alternatives for the remediation of industrial dye effluents as well as contaminated water bodies.

scholarly journals Dye Removal from Water and Wastewater Using Various Physical, Chemical, and Biological Processes

2018 ◽  
Vol 101 (5) ◽  
pp. 1371-1384 ◽  
Author(s):  
Krzysztof Piaskowski ◽  
Renata Świderska-Dąbrowska ◽  
Paweł K Zarzycki
Keyword(s):  
Textile Industry ◽  
Membrane Filtration ◽  
Carbon Nanomaterials ◽  
Dye Removal ◽  
Low Cost ◽  
Synthetic Dyes ◽  
Green Algal ◽  
Exchange Adsorption ◽  
Water Ecosystems ◽  
Synthetic Colorants

Abstract Synthetic dyes or colorants are key chemicals for various industries producing textiles, food, cosmetics, pharmaceutics, printer inks, leather, and plastics. Nowadays, the textile industry is the major consumer of dyes. The mass of synthetic colorants used by this industry is estimated at the level of 1 ÷ 3 × 105 tons, in comparison with the total annual consumption of around 7 × 105 tons worldwide. Synthetic dyes are relatively easy to detect but difficult to eliminate from wastewater and surface water ecosystems because of their aromatic chemical structure. It should be highlighted that the relatively high stability of synthetic dyes leads to health and ecological concerns due to their toxic, mutagenic, and carcinogenic nature. Currently, removal of such chemicals from wastewater involves various techniques, including flocculation/coagulation, precipitation, photocatalytic degradation, biological oxidation, ion exchange, adsorption, and membrane filtration. In this review, a number of classical and modern technologies for synthetic dye removal from industry-originated wastewater were summarized and discussed. There is an increasing interest in the application of waste organic materials (e.g., compounds extracted from orange bagasse, fungus biosorbent, or green algal biomasses) as effective, low-cost, and ecologically friendly sorbents. Moreover, a number of dye removal processes are based on newly discovered carbon nanomaterials (carbon nanotubes and graphene as well as their derivatives).

scholarly journals Chemical Modification of Combusted Coal Gangue for U(VI) Adsorption: Towards a Waste Control by Waste Strategy

2021 ◽  
Vol 13 (15) ◽  
pp. 8421
Author(s):  
Yuan Gao ◽  
Jiandong Huang ◽  
Meng Li ◽  
Zhongran Dai ◽  
Rongli Jiang ◽  
...  
Keyword(s):  
Structural Analysis ◽  
High Efficiency ◽  
Low Cost ◽  
Chemical Activation ◽  
Cost Effective ◽  
Coal Gangue ◽  
Order Kinetic ◽  
Practical Applications ◽  
Detailed Structural Analysis ◽  
Alkaline Conditions

Uranium mining waste causes serious radiation-related health and environmental problems. This has encouraged efforts toward U(VI) removal with low cost and high efficiency. Typical uranium adsorbents, such as polymers, geopolymers, zeolites, and MOFs, and their associated high costs limit their practical applications. In this regard, this work found that the natural combusted coal gangue (CCG) could be a potential precursor of cheap sorbents to eliminate U(VI). The removal efficiency was modulated by chemical activation under acid and alkaline conditions, obtaining HCG (CCG activated with HCl) and KCG (CCG activated with KOH), respectively. The detailed structural analysis uncovered that those natural mineral substances, including quartz and kaolinite, were the main components in CCG and HCG. One of the key findings was that kalsilite formed in KCG under a mild synthetic condition can conspicuous enhance the affinity towards U(VI). The best equilibrium adsorption capacity with KCG was observed to be 140 mg/g under pH 6 within 120 min, following a pseudo-second-order kinetic model. To understand the improved adsorption performance, an adsorption mechanism was proposed by evaluating the pH of uranyl solutions, adsorbent dosage, as well as contact time. Combining with the structural analysis, this revealed that the uranyl adsorption process was mainly governed by chemisorption. This study gave rise to a utilization approach for CCG to obtain cost-effective adsorbents and paved a novel way towards eliminating uranium by a waste control by waste strategy.

scholarly journals Treatment of wastewater containing printing dyes: summary and perspectives

2020 ◽  
Author(s):  
Đurđa Kerkez ◽  
◽  
Milena Bečelić-Tomin ◽  
Gordana Pucar Milidrag ◽  
Vesna Gvoić ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Dye Removal ◽  
High Efficiency ◽  
Light Attenuation ◽  
Synthetic Dyes ◽  
Dye Molecules ◽  
Time Saving ◽  
Printing Process ◽  
Industrial Sectors

Synthetic dyes are widely used in textile, printing, leather tanning, cosmetic, drug and food processing industries. The printing and dyeing industry is considered as one of the most polluting industrial sectors. The printing process is very versatile and includes printing on paper as well as printing on textile, plastic and other materials. After the printing process is completed, various chemicals such as ethers, alcohols, phenols, aldehydes, ketones, benzene, and esters are used in the cleaning procedure. Resulting wastewater often contains a variety of solvents, surfactants, dyes, and other chemicals, thus greatly increasing the difficulty of wastewater treatment. Improper discharge of printing and dyeing wastewater into water bodies will have several effect, beginning with aesthetical issues followed by destruction of the aqueous ecosystem due to light attenuation, oxygen consumption and toxicity effects. Therefore, it is very important to find out and optimize printing and dying wastewater treatment techniques. Processes for dye removal from wastewater can be physical, chemical, biological and more recently hybrid treatments. Physical processes such as adsorption, based on mass transfer mechanism, are commonly used method mainly due to ease of operation and high efficiency. Chemical processes including coagulation and flocculation, advanced oxidation processes and electrochemical treatment are usually more expensive due t chemicals use, equipment requirements and electrical energy consumption. However, these techniques are destructive and may lead to total mineralization of dye molecules and accompanying pollutants. Biological treatment is a low-cost and environmentally friendly process that produces less sludge. This method has significant advantages but dye molecules are less prone to this kind of treatment as they are made to be stable and reluctant. So, the adjustment and optimization of biological treatment, for dye removal, is an ongoing field of research. In recent studies hybrid processes are gaining more attention, combining different techniques. Integrating treatments, as a cost-saving and time-saving process, can represent optimal solution for printing wastewater treatment.

scholarly journals Fabrication of a cost-effective lemongrass (Cymbopogon citratus) membrane with antibacterial activity for dye removal

RSC Advances ◽  
2019 ◽  
Vol 9 (58) ◽  
pp. 34076-34085 ◽  
Author(s):  
Zengxiao Cai ◽  
Rechana Remadevi ◽  
Md Abdullah Al Faruque ◽  
Mohan Setty ◽  
Linpeng Fan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Dye Removal ◽  
Antibacterial Property ◽  
Low Cost ◽  
Dye Adsorption ◽  
Cost Effective ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Dye Wastewater ◽  
Cymbopogon Citratus

Dye wastewater has caused severe environmental and health problems. In this work, we have fabricated a novel low-cost membrane with good methylene blue dye adsorption and antibacterial property from naturally sustainable lemongrass (Cymbopogon citratus).

scholarly journals Strain-enabled ultra-broadband Ge-based photonic devices for low-cost integration in PICs

2020 ◽  
Author(s):  
Yiding Lin ◽  
Danhao Ma ◽  
Rui-Tao Wen ◽  
Kwang Hong Lee ◽  
Govindo Syaranamual ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Communication Networks ◽  
High Efficiency ◽  
Low Cost ◽  
Data Communication ◽  
Cost Effective ◽  
Photonic Devices ◽  
Single Step ◽  
High Data ◽  
Data Capacity

Abstract Photonic-integrated circuits (PICs) have become one of the most promising solutions to the burgeoning global data communication and are being envisioned to have revolutionary impact in many other emerging fields. This outlook requires future PICs to be significantly more broadband and cost-effective. The current germanium (Ge)-based active photonic devices in PICs are thus facing a new bandwidth-cost trade-off. Here, we demonstrate ultra-broadband, high-efficiency Ge photodetectors up to 1,630 nm operation wavelength and Ge0.99Si0.01 electro-absorption (EA) modulator arrays with an operating range of ~100 nm from 1,525 to 1,620 nm, using a CMOS-compatible recess-type silicon nitride (SiNx) stressor. The broadband operation could facilitate a wide (>100 nm) window for low-cost Ge modulator-detector co-integration, requiring only a single step of Ge epitaxy and two different SiNx depositions. The broad modulation and co-integration coverage can be entirely shifted to shorter (~1,300 nm) and longer (>1,700 nm) wavelengths with small amounts of Si or tin (Sn) alloying. This proof-of-concept work provides a pathway for PICs towards future low-cost and high-data-capacity communication networks, immediately accessible by designers through foundries.

Rigorous Design Process for a Groundwater Pump for Low-Yield Water Wells: A Case Study

2010 ◽  
Author(s):  
Peter Anderson ◽  
James Wonson ◽  
W. John Dartnall
Keyword(s):  
Developing Countries ◽  
Water Supply ◽  
Design Process ◽  
High Efficiency ◽  
Low Cost ◽  
Cost Effective ◽  
Production Volume ◽  
Tube Wells ◽  
Well Yield

Ground-water pumping in remote areas, such as Australian farms, was for many years traditionally done by wind pumps in order to satisfy the needs of stock. Since the 1980’s solar pumps of varying designs have become popular for pumping water from farm dams and tube wells. Wind pumps, solar pumps, engine or electric motor driven pumps and even animal/human powered pumps have a future in many remote situations in the world for stock watering, irrigation and for village water supply in developing countries. In these markets there is a wide-spread view that local manufacture of the pumps is preferable, as is well documented in the literature on village water supply in developing countries. Submersible pumps that are either of the multi-stage centrifugal class or that use the progressive cavity principle have increased in popularity in the low well yield environment. However, where well yields are extremely low the efficiency of these pumps also becomes low and oversized pumps of these kinds are often inappropriately applied. Quite often in the low yield situation, tube wells are also oversized in that they are drilled to large diameters and depths so as to provide storage in order to accommodate the water demand requirements of the user. This practice leads to unnecessary deterioration of both pump and well. Designing for low production volume manufacture presents unique challenges for the designer in attempting to design a robust, versatile but cost-effective product. The design challenges include, achievement of: - high efficiency, reliability, longevity, simplicity, versatility with a minimum parts count, and all this at a low cost. A case study is presented in this paper in which the design issues are outlined. A rigorous design process has been applied in this case study.

Ferrocene-Crosslinked Polypyrrole Hydrogel Derived Fe-N-doped Hierarchical Porous Carbon as Efficient Electrocatalysts for pH Universal ORR and Zn-air battery

2021 ◽  
Author(s):  
Peng Sun ◽  
Teng Zhang ◽  
Hantian Luo ◽  
Jinli Dou ◽  
Weiwei Bian ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Efficiency ◽  
Low Cost ◽  
Cost Effective ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous ◽  
Air Battery ◽  
Carbon Based

Herein, a cost-effective and high-efficiency Fe-N-doped carbon-based catalysts, denoted as PF-800, was facilely prepared via direct carbonization of a polypyrrole hydrogel (PF) using the low cost and commercial massive produced...

Adsorption of cefixime from aqueous solutions using modified hardened paste of Portland cement by perlite; optimization by Taguchi method

2016 ◽  
Vol 74 (5) ◽  
pp. 1069-1078 ◽  
Author(s):  
Mohammad Hossein Rasoulifard ◽  
Soghra Khanmohammadi ◽  
Azam Heidari
Keyword(s):  
Portland Cement ◽  
Aqueous Solutions ◽  
High Efficiency ◽  
Low Cost ◽  
Cost Effective ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Affecting Factors ◽  
Effective Removal ◽  
Removal Technique

In the present study, we have used a simple and cost-effective removal technique by a commercially available Fe-Al-SiO2 containing complex material (hardened paste of Portland cement (HPPC)). The adsorbing performance of HPPC and modified HPPC with perlite for removal of cefixime from aqueous solutions was investigated comparatively by using batch adsorption studies. HPPC has been selected because of the main advantages such as high efficiency, simple separation of sludge, low-cost and abundant availability. A Taguchi orthogonal array experimental design with an OA16 (45) matrix was employed to optimize the affecting factors of adsorbate concentration, adsorbent dosage, type of adsorbent, contact time and pH. On the basis of equilibrium adsorption data, Langmuir, Freundlich and Temkin adsorption isotherm models were also confirmed. The results showed that HPPC and modified HPPC were both efficient adsorbents for cefixime removal.

scholarly journals Cost-Effective 1T-MoS2 Grown on Graphite Cathode Materials for High-Temperature Rechargeable Aluminum Ion Batteries and Hydrogen Evolution in Water Splitting

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1547
Author(s):  
Shivaraj Patil ◽  
Ji-Yao An ◽  
Zhi-Jie Li ◽  
Yu-Cheng Wu ◽  
Swathi M. Gowdru ◽  
...  
Keyword(s):  
High Temperature ◽  
Hydrogen Evolution ◽  
High Efficiency ◽  
Low Cost ◽  
High Capacity ◽  
Cost Effective ◽  
Graphite Powder ◽  
Molybdenum Sulfide ◽  
Aluminum Ion ◽  
Alternative Materials

The high dependence on and high cost of lithium has led to a search for alternative materials. Aluminum ion batteries (AIBs) have gained interest due to their abundance, low cost, and high capacity. However, the use of the expensive 1-ethyl-3-methylimidazolium chloride (EMIC) electrolyte in AIBs curtails its wide application. Recently, high-temperature batteries have also gained much attention owing to their high demand by industries. Herein, we introduce cost-effective 1T molybdenum sulfide grown on SP-1 graphite powder (1T-MoS2/SP-1) as a cathode material for high-temperature AIBs using the AlCl3-urea eutectic electrolyte (1T-MoS2/SP-1–urea system). The AIB using the 1T-MoS2/SP-1–urea system exhibited a capacity as high as 200 mAh/g with high efficiency of 99% over 100 cycles at 60 °C when cycled at the rate of 100 mA/g. However, the AIB displayed a capacity of 105 mAh/g when cycled at room temperature. The enhanced performance of the 1T-MoS2/SP-1–urea system is attributed to reduced viscosity of the AlCl3-urea eutectic electrolyte at higher temperatures with high compatibility of 1T-MoS2 with SP-1. Moreover, the electrocatalytic lithiation of 1T-MoS2 and its effect on the hydrogen evolution reaction were also investigated. We believe that our work can act as a beacon for finding alternative, cost-effective, and high-temperature batteries.

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