Composite Adsorbents via In-Situ Alkali Activation
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Solution Overview
Problem
Current methods for producing zeolite and activated carbon composite adsorbents are costly due to the use of pre-produced materials, involve high-temperature activation processes, and result in adsorbents with inadequate shapes and sizes for continuous adsorption processes, leading to inefficiencies in removing both inorganic and organic pollutants from wastewater.
Innovation Solution
A composite adsorbent composition and process that mixes a geopolymer material, a carbonaceous material, and an alkali activating agent, allowing in-situ production of zeolite and activated carbon through alkali activation and hydrothermal treatment, enabling the creation of shaped adsorbents with improved mechanical strength and adsorption capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-produced zeolite and activated carbon are used to make composite adsorbents, then adsorption performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent incorporates carbonaceous material and alkali activating agent into the geopolymer mixture before forming the final adsorbent product. This preliminary incorporation allows the carbonaceous material to be activated in-situ during subsequent heat treatment, eliminating the need for separate pre-production of activated carbon and zeolite, thereby reducing manufacturing costs while maintaining adsorption performance.
Solution Approach 2:
The patent combines multiple functions into a single composite adsorbent material. By integrating geopolymer, carbonaceous material, and alkali activating agent into one mixture, the patent produces a unified adsorbent that simultaneously provides the adsorption capabilities of both zeolite and activated carbon, eliminating the need for separate pre-produced components and reducing overall manufacturing complexity and cost.
2Reliability
If high-temperature activation process is used to produce activated carbon, then adsorption capacity is improved, but energy consumption increases
Solution Approach 1:
The patent merges the activation of carbonaceous material and the formation of geopolymer/zeolite into a single heat treatment step. By incorporating the alkali activating agent into the mixture before forming, the subsequent heat treatment simultaneously activates the carbon and forms the zeolite structure, eliminating the need for separate high-temperature activation steps and reducing overall energy consumption.
Solution Approach 2:
The alkali activating agent is incorporated into the mixture beforehand, so that during the heat treatment process, it automatically activates the carbonaceous material and forms the geopolymer structure. This preliminary incorporation eliminates the need for separate activation steps, reducing energy consumption while achieving the required adsorption capacity.
3Productivity
If shaped adsorbents are produced for continuous processes, then operational efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent forms the shaped adsorbent product directly from the mixture containing geopolymer, carbonaceous material, and alkali activating agent. By incorporating all necessary components into the mixture before shaping, the patent simplifies the manufacturing process while producing shaped adsorbents suitable for continuous processes, thereby improving operational efficiency without significantly increasing manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process produces low-cost, high-performance zeolite and carbon composite adsorbents with desired shapes and sizes, effectively removing both inorganic and organic pollutants from liquids and gases, reducing system costs and complexity.
Implementation Method 1
chemically activating the carbonaceous material in the granule or pellet compositions at a temperature of greater than about 400° C. in an inert gas using the alkali activating agent present in the compositions to in-situ produce activated carbon
Implementation Method 2
conducting hydrothermal treatment of the composition to convert part of the geopolymer to in-situ produce zeolite
Implementation Method 3
The composite adsorbents are effective to remove both organic and inorganic undesired compounds from liquids and gases
Data Source
AI summary
A composition for making composite adsorbents from a mixture of geopolymer, zeolite and activated carbon wherein a geopolymer material, a carbonaceous material, and an alkali activating agent are the components of the mixture. The alkali activating agent to carbonaceous material solid mass ratio is at least 0.25:1, respectively. A process for producing shaped composite adsorbents from the composition is done using conventional means such as mixing, shaping, extrusion and other methods. Alkali activation is used to convert the carbonaceous material to activated carbon, followed by hydrothermal treatment to convert the geopolymer material to zeolites. Shaped composite adsorbents fabricated from the composition of the instant invention are used for adsorption, purification, or other separation applications of liquids and gases.